CN206433180U - A kind of diaphragm of loudspeaker tester with controlled excitation source - Google Patents
A kind of diaphragm of loudspeaker tester with controlled excitation source Download PDFInfo
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- CN206433180U CN206433180U CN201621445028.7U CN201621445028U CN206433180U CN 206433180 U CN206433180 U CN 206433180U CN 201621445028 U CN201621445028 U CN 201621445028U CN 206433180 U CN206433180 U CN 206433180U
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Abstract
The utility model proposes a kind of diaphragm of loudspeaker tester with controlled excitation source, including platform to be measured, controlled excitation source, laser displacement sensor, control device；Vibrating diaphragm to be measured is fixed on platform to be measured, and laser displacement sensor is fixed on platform to be measured；Vibrating diaphragm to be measured is co-axially located on platform to be measured with laser displacement sensor；Control signal is inputted controlled excitation source by control device, and controlled excitation source produces pumping signal according to the control signal；Vibrating diaphragm to be measured produces vibration as the pumping signal excitation produced by controlled excitation source；Laser displacement sensor detects vibration information during diaphragm oscillations.The utility model controlled excitation source can preferably excite diaphragm oscillations to be measured, vibrating diaphragm physical parameter be obtained by measuring the number of ways such as air pressure, vibrating diaphragm displacement, with higher measuring accuracy and preferable stability.
Description
Technical field
The utility model is related to loudspeaker testing field, more particularly to a kind of diaphragm of loudspeaker with controlled excitation source is surveyed
Try instrument.
Background technology
Loudspeaker is a kind of electricity-power-sonic transducer, is the critical elements in stereo set.Vibrating diaphragm is used as inside loudspeakers
Important component, directly affect speaker performance parameter.It is therefore desirable to a kind of reliable and stable method of testing and build according to this
Tester the diaphragm of loudspeaker is tested.
Traditional testing scheme further promotes vibrating diaphragm by speaker drive air；By pressure sensor or laser
Sensor catches the amplitude curve of vibrating diaphragm to be measured, so as to obtain the resonant frequency Fo values of vibrating diaphragm.
Sonic transducer is for example used in the U of patent CN 201788018, the pressure change of cavity is picked up, film to be measured is obtained
The resonant frequency Fo values of piece；This method needs chamber pressure change to have obvious formant in actual test, if to be measured
The Q values of vibrating diaphragm are relatively low, and the error of Fo test results can be larger, loses the meaning of test.
The amplitude of laser pickup vibrating diaphragm to be measured is used in another A of patent CN 104125532, the humorous of diaphragm to be measured is obtained
Vibration frequency Fo values.
But this system for drive the speaker due to not monitoring effectively, therefore the stability of system is driven
The influence of unit is larger, is also compared high with the requirement of the air-tightness between test fixture simultaneously for vibrating diaphragm to be measured；In practical application
In have many limitations.
Accordingly, it would be desirable to which new incentive program, solves the shortcoming of prior art, lifting measuring accuracy and stability.
Utility model content
A purpose of the present utility model is to propose a kind of diaphragm of loudspeaker tester with controlled excitation source, passed through
The progress of the parameters such as air pressure, displacement is handled and obtains diaphragm of loudspeaker mechanics and parameters,acoustic.
Another purpose of the present utility model is that proposition is a kind of and treats the side that vibration measuring film laying state is monitored in real time
Case.
Further object of the present utility model is to propose a kind of vibrating diaphragm adjustment excitation letter for different sizes, type
Number, lift the adaptive Adjusted Option of test accuracy.
For up to this purpose, the utility model uses following technical scheme：
A kind of diaphragm of loudspeaker tester with controlled excitation source, for test loudspeaker vibrating diaphragm, it includes：
Platform to be measured, controlled excitation source, laser displacement sensor, control device；
Vibrating diaphragm to be measured is fixed on platform to be measured, and laser displacement sensor is fixed on platform to be measured；It is preferred that, treat vibration measuring
Film is co-axially located on platform to be measured with laser displacement sensor；
Control signal is inputted controlled excitation source by control device, and controlled excitation source produces excitation letter according to the control signal
Number；
Vibrating diaphragm to be measured produces vibration as the pumping signal excitation produced by controlled excitation source；
Laser displacement sensor detects vibration information during diaphragm oscillations.
A kind of preferred tester, wherein,
The controlled excitation source is loudspeaker driving source；It is preferred that, the loudspeaker driving source is that band baroceptor is anti-
The loudspeaker excitation system of feedback；
It is preferred that, in addition to baroceptor, the air pressure change between baroceptor detection controlled excitation source and vibrating diaphragm；
It is preferred that, a closed cavity structure is formed between the loudspeaker driving source and the vibrating diaphragm to be measured；It is preferred that, envelope
Close inside cavity and baroceptor is set, baroceptor is used to detect that seal cavity inner and outer air pressure is poor；It is preferred that, it is flat by test
Platform forms a closed cavity structure between the loudspeaker driving source and the vibrating diaphragm to be measured；
It is furthermore preferred that the baroceptor can be：Probe type microphone, Electret Condencer Microphone, the wheat of mems structures
Gram wind, special mems baroceptors or the combination of special mems baroceptors；It is furthermore preferred that described special mems air pressure transmissions
Sensor is combined, including the mems baroceptors that a broadband frequency band is 0Hz~1kHz, and a high-resolution resolution ratio is excellent
In 1mPa mems microphones；
It is preferred that, also with data processor, test result is handled；It is preferred that, data processor is by treating
Survey the vibration information that the diaphragm of loudspeaker produces to be handled, vibrating diaphragm resonant frequency Fo values can be obtained, Q value, pliable
Mechanics and the parameters,acoustics such as Cms, oscillating mass Mms, displacement curve；
It is preferred that, the laser displacement sensor is the laser displacement sensor based on trigonometry principle, or based on sharp
The laser vibrometer sensor of light Doppler effect.
A kind of preferred tester, wherein,
The controlled excitation source is the stepping push-rod electric machine excitation system fed back with baroceptor；
It is preferred that, test chamber is formed by platform to be measured between stepping push-rod electric machine and vibrating diaphragm to be measured；It is preferred that, in test chamber
Baroceptor is placed, for detecting that seal cavity inner and outer air pressure is poor；
It is preferred that, the stepping push-rod electric machine pusher cylinder produces controlled air-flow；
It is preferred that, the test chamber that the air-flow passes through sealed conducting tube to platform to be measured；It is preferred that, sealing duct can be with
It is silicone tube or metal tube；
It is preferred that, table top fixed placement vibrating diaphragm to be measured to be measured, the coaxial top of vibrating diaphragm to be measured sets laser displacement to sense
Device, for detecting the parameters such as vibrating diaphragm amplitude, speed, acceleration；
It is preferred that, also with data processor, test result is handled；It is preferred that, data processor is by treating
Survey the vibration information that the diaphragm of loudspeaker produces to be handled, vibrating diaphragm resonant frequency Fo values can be obtained, Q value, pliable
Mechanics and the parameters,acoustics such as Cms, oscillating mass Mms, displacement curve；
It is preferred that, the laser displacement sensor is the laser displacement sensor based on trigonometry principle, or based on sharp
The laser vibrometer sensor of light Doppler effect.
A kind of preferred tester, wherein,
The controlled excitation source is the cylinder excitation system fed back with baroceptor；
It is preferred that, sealing test chamber is formed by platform to be measured between cylinder and vibrating diaphragm to be measured；It is preferred that, sealing test intracavitary
Baroceptor is placed, for detecting that seal cavity inner and outer air pressure is poor；
The cylinder pusher cylinder produces controlled air-flow；
The test chamber that the air-flow passes through sealed conducting tube to platform to be measured；It is preferred that, sealing duct can be silica gel
Pipe or metal tube；
It is preferred that, table top fixed placement vibrating diaphragm to be measured to be measured, the coaxial top of vibrating diaphragm to be measured sets laser displacement to sense
Device, for detecting the parameters such as vibrating diaphragm amplitude, speed, acceleration；
It is preferred that, also with data processor, test result is handled；It is preferred that, data processor is by treating
Survey the vibration information that the diaphragm of loudspeaker produces to be handled, vibrating diaphragm resonant frequency Fo values can be obtained, Q value, pliable
Mechanics and the parameters,acoustics such as Cms, oscillating mass Mms, displacement curve；
It is preferred that, the laser displacement sensor is the laser displacement sensor based on trigonometry principle, or based on sharp
The laser vibrometer sensor of light Doppler effect；
It is preferred that, in test, cylinder loading air pressure；Vibrating diaphragm above annular seal space, which is promoted, produces deformation, air pressure
Sensor, laser displacement sensor detect initial gas pressure initial value and displacement initial value simultaneously；It is preferred that, annular seal space exists special
With leakage device, slow gas leakage in cavity, it is free laying state that vibrating diaphragm, which is slowly replied,；It is preferred that, the process replied in vibrating diaphragm
In detect air pressure change value and change in displacement value simultaneously；It is preferred that, to the suitable of vibrating diaphragm can be obtained after the processing of above testing result
The parameters such as property Cms, resonant frequency value Fo.
A kind of preferred tester, wherein,
The controlled excitation source is voice coil motor excitation system；It is preferred that, driving source is used as by voice coil motor；
It is preferred that, the voice coil motor excitation system resonant frequency need to be less than the resonant frequency of vibrating diaphragm to be measured；
It is preferred that, vibrating diaphragm fixed placement to be measured is between platform to be measured, the voice coil motor and the vibrating diaphragm to be measured without gas
Close property requirement；It is preferred that, it need not place baroceptor between the voice coil motor and the vibrating diaphragm to be measured；
It is preferred that, the coaxial top of vibrating diaphragm to be measured sets laser displacement sensor, for detecting vibrating diaphragm amplitude, speed, acceleration
The parameters such as degree；
Including cantilever, cantilever outer end is fixed on test platform, and cantilever core fixes vibrating diaphragm to be measured.Cantilever is by least
One muscle connection central area and perimeter；
It is preferred that, adjusted by the shape of muscle, quantitative design, or the adjustment of cantilever material in itself, thickness, adjust voice coil loudspeaker voice coil
The resonant frequency of motor oscillating part, makes voice coil motor oscillating component resonant frequency be less than vibrating diaphragm resonant frequency to be measured；
It is preferred that, voice coil motor pushes directly on Platform Vibration to be measured, and platform to be measured drives and is fixed on treating on platform to be measured
Survey diaphragm oscillations；When the voice coil motor driving frequency is identical with vibrating diaphragm resonant frequency, vibrating diaphragm resonance；Laser displacement sensor
The information such as amplitude of the vibrating diaphragm under different driving frequencies can be detected, by the way that vibrating diaphragm can be drawn to test data progress processing
Resonant frequency Fo values and vibrating diaphragm Q value；
It is preferred that, also with data processor, test result is handled；It is preferred that, data processor is by treating
Survey the vibration information that the diaphragm of loudspeaker produces to be handled, vibrating diaphragm resonant frequency Fo values can be obtained, Q value, pliable
Mechanics and the parameters,acoustics such as Cms, oscillating mass Mms, displacement curve；
It is preferred that, the laser displacement sensor is the laser displacement sensor based on trigonometry principle, or based on sharp
The laser vibrometer sensor of light Doppler effect.
A kind of method of test loudspeaker vibrating diaphragm, wherein,
Foregoing any tester is provided；
Control signal is inputted controlled excitation source by control device, and controlled excitation source produces excitation letter according to the control signal
Number；
Vibrating diaphragm to be measured produces vibration as the pumping signal excitation produced by controlled excitation source；
Laser displacement sensor detects vibration information during diaphragm oscillations.
It is preferred that, according to the air-tightness between different the adjustment test platforms and driving source of driving source mode, controlled excitation
Source uses seal cavity when being the driving source of baroceptor feedback, without seal cavity when controlled excitation source is voice coil motor；
It is preferred that, the frock of fixed vibrating diaphragm can be translated with horizontal direction to be adjusted；The support of fixed laser displacement transducer can
To be adjusted above and below vertical direction.Laser displacement sensor is set to focus on vibrating diaphragm to be measured.
A kind of preferred method, wherein,
The draught head between the baroceptor of inside cavity pickup inside cavity and external atmosphere pressure is arranged at, and is fed back
To data processor；
The displacement of laser displacement sensor pickup vibrating diaphragm, speed, acceleration signal, and feed back to data processor；
Data processor adjusts excitation amplitude according to feedback signal, it is ensured that different vibrating diaphragms to be measured have suitable amplitude, carry
Rise laser displacement sensor detection signal-to-noise ratio；
It is preferred that, for the diaphragm of loudspeaker, first carry out preliminary survey calibration；
It is preferred that, when carrying out vibrating diaphragm test, in closed cavity gas when the baroceptor monitors diaphragm oscillations in real time
The difference of pressure and external atmosphere pressure.When vibrating diaphragm is not in place and there is leakage, baroceptor testing result occurs abnormal.
Abnormal signal is fed back to data processor by baroceptor, and points out user to reappose vibrating diaphragm to be measured, and vibration measuring is treated in confirmation
Keep that test can be continued after sealing between film and excitation loudspeaker.
It is preferred that, data processor obtains the test result of two kinds of baroceptors simultaneously during test.System first choice high score
Resolution mems microphone test results, but when measuring air pressure value is more than mems microphone ranges, system chooses special width automatically
Frequency band mems baroceptor test results.
It is preferred that, the mode for obtaining the pliable parameter of vibrating diaphragm is as follows：Vibrating diaphragm stress and displacement relation curve, F=Δ p*s, Δ p
For vibrating diaphragm both sides draught head, s is that vibrating diaphragm effectively vibrates area；Baroceptor detects that Δ p, vibrating diaphragm open area s are determined by frock；
Vibrating diaphragm stressK is the vibrating diaphragm coefficient of stiffiness, and Cms is pliable coefficient；So In coefficient a be constant, measure Δ p, laser position through baroceptor
After the displacement sensor measurement parameter such as x, a can be drawn by test result the Fitting Calculation, due to s, it is known thatEnergy
Obtain the pliable parameter of vibrating diaphragm.
A kind of preferred method, wherein,
Stepping push-rod electric machine provides low frequency air pressure,
It is preferred that, low frequency air pressure can improve test vibrating diaphragm quasistatic parameter and the precision of nonlinear parameter；
It is preferred that, test chamber is formed by platform to be measured between stepping push-rod electric machine and vibrating diaphragm to be measured, intracavitary places air pressure transmission
Sensor, for detecting that seal cavity inner and outer air pressure is poor.
A kind of preferred method, wherein,
In test, cylinder loading air pressure；Vibrating diaphragm above annular seal space, which is promoted, produces deformation, baroceptor,
Laser displacement sensor detects initial gas pressure initial value and displacement initial value simultaneously；
It is preferred that, there is slow gas leakage in special leakage device, cavity in annular seal space, vibrating diaphragm slowly replys freely to place shape
State；
It is preferred that, air pressure change value and change in displacement value are detected simultaneously during vibrating diaphragm is replied；
It is preferred that, the parameter such as pliable Cms, resonant frequency value Fo to vibrating diaphragm can be obtained after the processing of above testing result.
A kind of preferred method, wherein,
Voice coil motor pushes directly on Platform Vibration to be measured, and platform to be measured drives the vibrating diaphragm to be measured being fixed on platform to be measured to shake
It is dynamic；
When the voice coil motor driving frequency is identical with vibrating diaphragm resonant frequency, vibrating diaphragm resonance；
Laser displacement sensor can detect the information such as amplitude of the vibrating diaphragm under different driving frequencies；
By the way that vibrating diaphragm resonant frequency Fo values and vibrating diaphragm quality factor q value can be drawn to test data progress processing；
It is preferred that, by adjusting the shape of muscle, quantity or adjustment cantilever material in itself, thickness, adjust voice coil motor
The resonant frequency of oscillating component, makes voice coil motor oscillating component resonant frequency be less than vibrating diaphragm resonant frequency to be measured, finally makes laser
Displacement transducer can accurately detect the physical parameters such as the resonant frequency of vibrating diaphragm to be measured；
It is preferred that, for the diaphragm of loudspeaker, it is necessary to first carry out preliminary survey calibration.The displacement of laser displacement sensor pickup vibrating diaphragm,
Speed, acceleration signal, and feed back to data processor.Data processor adjusts excitation amplitude according to feedback signal, it is ensured that no
There are suitable amplitude, improving laser displacement transducer detection signal-to-noise ratio with vibrating diaphragm to be measured；
It is preferred that, when carrying out vibrating diaphragm test, such as vibrating diaphragm is not in place, and laser displacement sensor testing result occurs different
Often；Abnormal signal is fed back to data processor by laser displacement sensor, and points out user to reappose vibrating diaphragm to be measured, is confirmed
Test can be continued after vibrating diaphragm laying state to be measured is good；
It is preferred that, F can directly be measured by resonance method0：
Wherein mmsFor the equivalent oscillating mass of vibrating diaphragm, CmsIt is pliable for vibrating diaphragm.Swash using voice coil motor
Shake, voice coil motor motion oscillations part mass mv, vibrating diaphragm fixing tool quality mj, diaphragm mass m to be measuredd, cantilever equivalent mass
ms.Gross mass M=mv+mj+md+ms.Voice coil motor thrust Fv=BL*I, in low-frequency range FvWith shell fragment stress balance, in vibrating diaphragm
F near resonant frequencyvBalanced with M*a, i.e. Fv=M*a=BL*I, because mass of system is constant, BL values are constant, input current is not
Become, so speedTo weigh.But when vibrating diaphragm forced vibration to be measured produces resonance, acceleration will on steady state value
It is superimposed the extra acceleration a that vibrating diaphragm forced vibration to be measured is producedt=a+a ', wherein atFor total acceleration, a is basic and speed, a '
Coriolis acceleration when being resonated for vibrating diaphragm to be measured.A ' is such as identical with a phases, then atIncrease, such as opposite in phase, then atReduce.
The beneficial effects of the utility model are：
The utility model proposes a kind of vibrating diaphragm tester with controlled excitation source, data processor therein will be controlled
Signal inputs controlled excitation source, and controlled excitation source produces pumping signal.Vibrating diaphragm to be measured is fixed on platform to be measured, and laser displacement is passed
Sensor is fixed on platform, directly over vibrating diaphragm axial direction.The pumping signal that controlled excitation source is produced encourages diaphragm oscillations to be measured,
Baroceptor detects the air pressure change between controlled excitation source and vibrating diaphragm, position during laser displacement sensor detection diaphragm oscillations
The information such as shifting, speed and acceleration.Data processor carries out computing, display to test result.By being carried out to the diaphragm of loudspeaker
Test, can obtain the mechanics such as vibrating diaphragm resonant frequency Fo values, Q value, pliable Cms, oscillating mass Mms, displacement curve
And parameters,acoustic.
The utility model proposes a kind of vibrating diaphragm tester with controlled excitation source, it is necessary to first carry out preliminary survey calibration.If
The draught head being placed between the baroceptor of inside cavity pickup inside cavity and external atmosphere pressure, or passed by laser displacement
The parameters such as sensor pickup vibrating diaphragm displacement, and feed back to data processor.Data processor adjusts excitation amplitude according to feedback signal,
Ensure that different vibrating diaphragms to be measured have suitable amplitude, lifting baroceptor, laser displacement sensor detection signal-to-noise ratio.
The utility model proposes a kind of vibrating diaphragm tester with controlled excitation source, carry out vibrating diaphragm test when, it is described
Baroceptor is passed when monitoring diaphragm oscillations in real time in closed cavity air pressure and the difference of external atmosphere pressure, or by laser displacement
The parameters such as sensor pickup vibrating diaphragm displacement.When vibrating diaphragm is not in place, there is exception, or laser position in baroceptor testing result
Displacement sensor testing result is abnormal.Abnormal signal feeds back to data processor, and points out user to reappose vibrating diaphragm to be measured, really
Recognize and keep that test can be continued after sealing between vibrating diaphragm to be measured and excitation loudspeaker.
Baroceptor can monitor whether vibrating diaphragm is in place simultaneously, leakage phenomenon such as occur, and pneumatic parameter occurs different
Often, abnormal signal feedback data processor is finally shown and points out user to reappose vibrating diaphragm to be measured by baroceptor.
Another effect of baroceptor is：Preliminary survey calibration is carried out to the diaphragm of loudspeaker of different sizes, type, by gas
Signal feedback data processor is pressed, data processor adjusts excitation source signal amplitude according to feedback signal, different loudspeakers is shaken
Film is excited enough amplitudes, it is therefore an objective to lift test system and test precision and stability.
Brief description of the drawings
Fig. 1 is the system connection diagram that the utility model embodiment one is provided；
Fig. 2 is the schematic appearance that the utility model embodiment one is provided；
Fig. 3 is the partial section that the utility model embodiment one is provided；
Fig. 4 is the pressure difference and displacement measurement result that the utility model embodiment one is provided；
Fig. 5 is the test result processing that the utility model embodiment one is provided, speed and pressure difference ratio；
Fig. 6 is the schematic appearance that the utility model embodiment two is provided；
Fig. 7 is the draught head and displacement measurement result that the utility model embodiment two is provided；
Vibrating diaphragm displacement to be measured and stress relation test result shown in Fig. 8；
Fig. 9 is the schematic appearance that the utility model embodiment three is provided；
Figure 10 is the system connection diagram that the utility model example IV is provided；
Figure 11 is the schematic appearance that the utility model example IV is provided；
Figure 12 is the partial section that the utility model example IV is provided；
Figure 13 is the cantilever outside drawing that the utility model example IV is provided；
Figure 14 is the cantilever beam system fundamental frequency modal vibration mode simulation result that the utility model example IV is provided；
Figure 15 is the vibrating diaphragm fundamental frequency modal vibration mode simulation result to be measured that the utility model example IV is provided；
Figure 16 is the test curve that the utility model example IV is provided.
In figure,
1st, driving source；101st, loudspeaker；102nd, stepping push-rod electric machine；103rd, cylinder；104th, voice coil motor；
2nd, baroceptor；
3rd, platform to be measured；301st, upper pressing tool；302nd, lower pressing tool；303rd, base station；304th, base；305th, support；
306th, height adjustment knob；307th, vibrating diaphragm fixing tool；
4th, laser displacement sensor；
5th, data processor；501 control devices；502nd, signal pre-processing module；503rd, data acquisition and computing module；
504th, display device；505th, computer；
6th, vibrating diaphragm to be measured；
7th, cantilever；
801st, vibrating mass；802nd, voice coil loudspeaker voice coil；803rd, top flat；804th, magnet；805th, magnetic bowl；
9th, leak holes
Embodiment
Further illustrate the technical solution of the utility model below in conjunction with the accompanying drawings and by embodiment.
Embodiment one
The present embodiment provides a kind of diaphragm of loudspeaker tester with controlled excitation source, and controlled excitation source chooses band air pressure
The loudspeaker excitation system of sensor feedback, system connection diagram is as shown in Figure 1.The present embodiment includes：1st, driving source；2nd, gas
Pressure sensor；3rd, platform to be measured；4th, laser displacement sensor；5th, data processor；501st, control device；502nd, Signal Pretreatment
Module；503rd, data acquisition and computing module；504th, display device；505th, computer.Wherein, control 501, Signal Pretreatment
Module 502, data acquisition and computing module 503, display device 504, computer 505 are referred to as data processor 5.
Control device 501 is used for the output drive signal of driving source 1；Signal processing module 502 is used to receive air pressure sensing
Device 2, the detection signal of laser displacement sensor 4, and transmit to data acquisition and computing module 503 and computer 505；Data are adopted
The input that collection is used to handle detection signal and adjust control device 501 with computing module 503 and computer 505 is believed
Number；Display device 504 is used for the display of test result.
Fig. 2 is the schematic appearance that the present embodiment is provided.Including platform 3 to be measured, laser displacement sensor 4, vibrating diaphragm to be measured
6.Wherein, platform to be measured includes：301st, upper pressing tool；302nd, lower pressing tool；303rd, base station；304th, base；305th, support；
306th, height adjustment knob.Vibrating diaphragm 6 to be measured is fixed by upper pressing tool 301 with lower pressing tool 302.Lower pressing tool 302 with
Base station 303 is combined, and forms airtight cavity.Base station 303 is fixed on base 304.Laser displacement sensor 4 is placed in support 305
On, directly over the axial direction of vibrating diaphragm 6 to be measured, height is controlled by height adjustment knob, focusing is realized.
It is preferred that, the laser displacement sensor can be the laser displacement sensor based on trigonometry principle, Huo Zheji
In the laser vibrometer sensor of laser doppler.
Fig. 3 is the partial section that the present embodiment is provided, including 101, loudspeaker；2nd, baroceptor；301st, upper pressing
Frock；302nd, lower pressing tool；303rd, base station；6th, vibrating diaphragm to be measured.It is located at the placement loudspeaker 101 of inside cavity on base station 303；
It is located inside cavity on base station 303 and places baroceptor 2 simultaneously.It is preferred that, the loudspeaker driving source treats vibration measuring with described
One closed cavity structure of intermembranous formation；It is preferred that, baroceptor is set inside closed cavity, and baroceptor is used to detect
Seal cavity inner and outer air pressure is poor；It is preferred that, form one between the loudspeaker driving source and the vibrating diaphragm to be measured by test platform
Individual closed cavity structure；
It is furthermore preferred that the baroceptor can be：Probe type microphone, Electret Condencer Microphone, the wheat of mems structures
Gram wind, special mems baroceptors or the combination of special mems baroceptors；It is furthermore preferred that described special mems air pressure transmissions
Sensor is combined, including a broadband mems baroceptor, and a high-resolution mems microphone；It is preferred that, the width
Frequency band mems baroceptors frequency band is 0Hz~1kHz, and the high-resolution mems microphones resolution ratio is better than 1mPa；
During test, loudspeaker 101 vibrates, and seal cavity air pressure inside is changed, and encourages vibrating diaphragm 6 to be measured to vibrate, gas
The detection annular seal space air pressure inside change of pressure sensor 2, laser displacement sensor 4 detects displacement when vibrating diaphragm 6 to be measured vibrates, speed
With the information such as acceleration.Data processor 5 carries out computing, display to test result.Tested by treating vibration measuring film 6, can
To obtain mechanics and the parameters,acoustics such as resonant frequency Fo values, Q value, pliable Cms, oscillating mass Mms, displacement curve.
It is preferred that, also with data processor, test result is handled；It is preferred that, data processor is by treating
Survey the vibration information that the diaphragm of loudspeaker produces to be handled, vibrating diaphragm resonant frequency Fo values can be obtained, Q value, pliable
Mechanics and the parameters,acoustics such as Cms, oscillating mass Mms, displacement curve；
Fig. 4 is the draught head of the present embodiment offer, displacement measurement result.In figure, C1 is draught head test result, and C2 is position
Move test result.There are two peaks in 100Hz to 3000Hz in curve C1 and C2, and C1 and C2 is at about 450Hz due to loudspeaker
101 couple with annular seal space and peak occur.C1 and C2 about 1300Hz locate the peak value of appearance and resonated generation by vibrating diaphragm 6 to be measured.Specifically, C1
Crest frequency 1348Hz, C2 crest frequency are the crest frequency of 1306Hz, C1 and C2 near 1300Hz by near 450Hz
Peak value influences, and C1 and C2 crest frequencies are unequal.
Fig. 5 is handling test result for the present embodiment offer, speed and pressure difference ratio.Known formula v=d*
2* π * f, wherein v representation speeds, d represent displacement, and f represents frequency.Displacement measurement result and above-mentioned formula in figure, can be with
Calculate speed v.Speed v and pressure difference p test results are done into ratio, the ratio curve in Fig. 5 can be obtained.Ratio curve is only
There is a peak, peak is in 1258Hz.Speed v and pressure difference p are done into ratio, loudspeaker, annular seal space pair can be effectively removed
The influence of test result.Current conventional loudspeakers vibrating diaphragm tester only tests displacement curve by laser displacement sensor, passes through
Extract displacement or speed, acceleration peak value position draw vibrating diaphragm resonant frequency to be measured, it is impossible to avoid the parts pair such as excitation loudspeaker
The influence of vibrating diaphragm to be measured, the present embodiment acquired results are more accurate.
The present embodiment is before official testing is started, it is necessary to first carry out preliminary survey calibration.It is arranged at the air pressure sensing of inside cavity
Device 2 picks up the draught head between inside cavity and external atmosphere pressure, and feeds back to data processor 5.Data processor 5 is according to anti-
Feedback signal adjusts excitation amplitude, it is ensured that different vibrating diaphragms to be measured have suitable amplitude, lifting baroceptor, laser displacement sensing
Device detection signal-to-noise ratio.
The present embodiment is during vibrating diaphragm test is carried out, and the baroceptor 2 monitors vibrating diaphragm 6 to be measured and vibrated in real time
When in closed cavity air pressure and the difference of external atmosphere pressure.When vibrating diaphragm 6 to be measured is not in place, the testing result of baroceptor 2
Occur abnormal.Abnormal signal feeds back to data processor 5, points out user to reappose vibrating diaphragm to be measured, confirm vibrating diaphragm 2 to be measured with
Keep that test can be continued after sealing between driving source 1.
Embodiment two
The present embodiment provides a kind of diaphragm of loudspeaker tester with controlled excitation source, and controlled excitation source chooses band air pressure
The cylinder of sensor feedback, system connection diagram is as shown in Figure 1.The system connection of the present embodiment data processor 5, data
Detection mode is similar to embodiment one, and only driving source 1 is changed into cylinder 103 from loudspeaker 101.
Fig. 6 is the schematic appearance that the present embodiment is provided.Vibrating diaphragm 6 to be measured is by upper pressing tool 301 and lower pressing tool 302
It is fixed.Lower pressing tool 302 is combined with base station 303, forms airtight cavity, and annular seal space sets leak holes 9.Set on base station 303
Passage, is connected with cylinder 103 by tracheae.Base station 303 is assembled on base 304, and horizontal level is adjustable.It is located on base station 303
Inside cavity places baroceptor 2.Laser displacement sensor 4 is fixed on 3 on test platform, and laser displacement sensor 4 is laid
In on support 305, directly over the axial direction of vibrating diaphragm 6 to be measured, height is controlled by height adjustment knob, focusing is realized.
Cylinder 103 is as the excitation system of vibrating diaphragm tester, and in test, cylinder 103 loads air pressure.On annular seal space
The vibrating diaphragm to be measured 6 of side, which is promoted, produces deformation, at the beginning of baroceptor 2, laser displacement sensor 4 detect initial gas pressure simultaneously
Initial value and displacement initial value.Annular seal space sets slow gas leakage in leak 9, cavity, and vibrating diaphragm 6 to be measured slowly replys freely to place
State.Air pressure change value and change in displacement value are detected simultaneously during vibrating diaphragm 6 to be measured is replied.To the processing of above testing result
The parameters such as the pliable Cms of vibrating diaphragm, vibrating diaphragm weight Mms can be obtained afterwards, it is known that can pass through formulaCalculate
Draw the Fo values of vibrating diaphragm 6 to be measured.
The present embodiment can be detected to inside cavity air pressure by baroceptor 2 and feed back to data processor 5, real
Now to monitoring whether vibrating diaphragm 6 to be measured places exception in real time in the adjustment of the excitation amplitudes of different vibrating diaphragms 6 to be measured and test process.It is logical
Cross baroceptor 2, laser displacement sensor 4 to treat vibration measuring film 6 and tested, carry out computing through data processor 5, obtain humorous
Mechanics and the parameters,acoustics such as vibration frequency Fo values, Q value, pliable Cms, oscillating mass Mms, displacement curve.
Fig. 7 is the present embodiment draught head and displacement measurement result.C4 is that draught head changes over time test result, C5 in figure
It is that displacement changes over time test result.It is close with stopping pressurizeing after the quick load pulses air pressure of cylinder 103 immediately during test
Closed chamber inside and outside draught head reaches maximum in 100ms.Annular seal space sets leak holes 9, is gradually reduced inside cavity air pressure,
Curve C4 rapid increases before 100ms are can be seen that from Fig. 7 C4 curves, maximum 1000pa is reached during 100ms；From 100ms
Start, C4 slowly declines, and finally in 500ms, draught head is kept to 0pa substantially, illustrates annular seal space internal-external air pressure basic one
Cause.Because annular seal space inner and outer air pressure is inconsistent, vibrating diaphragm stress deformation to be measured, deformation quantity and air pressure difference correlation.Represent and shake in Fig. 7
The curve C5 of film displacement measurement result rapid increases before 100ms, reach maximum 400um, since 100ms at 100ms
Reduce, and be reduced to 0um substantially in 500ms.Such as extracting draught head Δ P maximum 1000pa, maximum displacement value d is
400um, and the effective vibration plane s products of known vibrating diaphragm to be measured 6 are 1cm2, then formula can be passed throughMeter
Calculate CmsPosition 4mm/N.Vibrating diaphragm weight Mms is, it is known that can pass through formulaCalculate vibrating diaphragm 6 to be measured
Fo values.
If using 0ms in Fig. 7 to 100ms periods air pressure difference as the longitudinal axis, vibrating diaphragm shift value to be measured, can as transverse axis
, can be with when the displacement of vibrating diaphragm 6 to be measured is smaller to obtain the displacement of vibrating diaphragm to be measured 6 as shown in C6 in Fig. 8 and draught head relation curve
It is approximately considered displacement and meets linear relationship with draught head.Can be with the fitting of draught head relation curve according to displacement in Fig. 8
A is counted, coefficient a and the pliable Cms of vibrating diaphragm to be measured relation areWherein s is effective vibration area of vibrating diaphragm 6 to be measured, institute
It is 4mm/N to obtain Cms values.Meanwhile, vibrating diaphragm 6 to be measured can be calculated in difference according to draught head, displacement result obtained by the present embodiment
The pliable value of position, when the displacement of vibrating diaphragm 6 to be measured is smaller, pliable Cms values are constant, pliable when the displacement of vibrating diaphragm 6 to be measured is larger
Cms values diminish, so as to realize the research to diaphragm materials and deformational nonlinearity.
Embodiment three
The present embodiment provides a kind of diaphragm of loudspeaker tester with controlled excitation source, and controlled excitation source chooses band air pressure
The stepping push-rod electric machine excitation system of sensor feedback, system connection diagram is as shown in Figure 1.The present embodiment data processor 5
System connection, Data Detection, data processing method it is similar to embodiment two, only driving source 1 is changed into stepping push rod from cylinder 103
Motor 102.
Fig. 9 is the schematic appearance that the present embodiment is provided.Vibrating diaphragm 6 to be measured is by upper pressing tool 301 and lower pressing tool 302
It is fixed.Lower pressing tool 302 is combined with base station 303, forms airtight cavity.Passage is set on base station 303, with stepping push rod electricity
Machine 102 is connected by tracheae.Base station 303 is assembled on base 304, and horizontal level is adjustable.Put on base station 303 positioned inside cavity
Put baroceptor 2.Laser displacement sensor 4 is fixed on 3 on test platform, and laser displacement sensor 4 is placed in support 305
On, directly over the axial direction of vibrating diaphragm 6 to be measured, height is controlled by height adjustment knob, focusing is realized.
The present embodiment is detected to inside cavity air pressure by baroceptor 2 and feeds back to data processor 5, real
Now to monitoring whether vibrating diaphragm 6 to be measured places exception in real time in the adjustment of the excitation amplitudes of different vibrating diaphragms 6 to be measured and test process.Pass through
Baroceptor 2, laser displacement sensor 4 are treated vibration measuring film 6 and tested, and carry out computing through data processor 5, obtain resonance
Mechanics and the parameters,acoustics such as frequency Fo values, Q value, pliable Cms, oscillating mass Mms, displacement curve.
Compared with the cylinder 103 that embodiment two is provided, the present embodiment stepping push-rod electric machine 102, which can be stablized, provides controllable
Low frequency air pressure, and the cylinder 103 in embodiment two can only provide pulse pressure, and to need leakage device to make close for embodiment two
Envelope chamber is slowly revealed, and the present embodiment is without additionally setting leak holes 9.The present embodiment is carried by the gas testing pressure of stepping push-rod electric machine 102
Ascending, descending is low, has the advantages that stable gas pressure is controllable.
The present embodiment is consistent for the mode of data sampling and processing with embodiment two, can be bent by draught head, displacement
Line, calculates the pliable Cms values of vibrating diaphragm 6 to be measured by modes such as fittings, it is known that diaphragm mass Mms, can calculate vibrating diaphragm 6 to be measured
Resonant frequency Fo values.Compared with current conventional loudspeakers vibrating diaphragm tester is by vibrating diaphragm resonance method, the utility model embodiment two,
Embodiment three draws resonant frequency value Fo compared to more accurate, stably, and test result not tested person system incentive source, structure
Part etc. is disturbed.
Example IV
The present embodiment proposes a kind of diaphragm of loudspeaker tester with controlled excitation source, and controlled excitation source chooses voice coil loudspeaker voice coil electricity
Machine, system connection diagram is as shown in Figure 10.The present embodiment includes：1st, driving source；3rd, platform to be measured；4th, laser displacement is sensed
Device；5th, data processor；501st, control device；502nd, signal pre-processing module；503rd, data acquisition and computing module；504th, it is existing
Reality and control module；505th, computer.Wherein, control device 501, signal pre-processing module 502, data acquisition and computing module
503rd, reality is referred to as data processor 5 with control module 504, computer 505.
Control device 501 is used for the output drive signal of driving source 1；Signal processing module 502 is used to receive laser displacement
Sensor 4 detects signal, and transmits to data acquisition and computing module 503 and computer 505；Data acquisition and computing module
503 are used to handle detection signal and adjust the input signal of control device 501 with computer 505；Display device
504 are used for the display of test result.
Figure 11 is the diaphragm of loudspeaker tester schematic appearance encouraged with voice coil motor, including：3rd, platform to be measured；4th, swash
Optical displacement sensor；6th, vibrating diaphragm to be measured；7th, cantilever.Wherein, platform 3 to be measured is by 301, upper pressing tool；302nd, lower pressing tool；
303rd, base station；304th, base；305th, support；306th, height adjustment knob is constituted.Wherein, as the voice coil motor 104 of driving source
Inside base station 303.
Laser displacement sensor 4 is installed, height adjustment knob 306 can adjust laser displacement sensor 4 on support 305
Highly, realize and focus on.Voice coil motor 104 is attached on base station 303, and in the placement of base station 303 and base 304, and horizontal level can
Adjustment.Upper pressing tool 301 is used for cantilever mounted 7, cantilever 7, vibrating diaphragm fixing tool 307 and voice coil loudspeaker voice coil electricity with lower pressing tool 302
Machine 104 is by screw locking.It is preferred that, the coaxial top of vibrating diaphragm to be measured sets laser displacement sensor, for detecting vibrating diaphragm amplitude, speed
The parameters such as degree, acceleration；It is preferred that, the laser displacement sensor can be the laser displacement sensing based on trigonometry principle
Device, or the laser vibrometer sensor based on laser doppler.
Figure 12 be voice coil motor and platform partial section to be measured, including：104th, voice coil motor；301st, upper pressing tool；
302nd, lower pressing tool；303rd, base station；6th, vibrating diaphragm to be measured；7th, cantilever.Voice coil motor 104 is by 801, vibrating mass；802nd, voice coil loudspeaker voice coil；
803rd, top flat；804th, magnet；805th, magnetic bowl composition.
Top flat 803, magnet 804 and magnetic bowl 805 in voice coil motor 104 is be bonded by glue, forms magnetostatic field, is fixed on base
On platform 303, voice coil loudspeaker voice coil 802 is positioned over magnetostatic field, and top is fixed with vibrating mass 801；Vibrating mass 801, cantilever 7, vibrating diaphragm fixing tool
307 pass through screw locking；Cantilever 7 is fixed by upper pressing tool 301, lower pressing tool 302 by screw locking.It is preferred that, treat
Vibration measuring film fixed placement is between platform to be measured, the voice coil motor and the vibrating diaphragm to be measured without air-tightness requirement；It is preferred that, institute
Baroceptor need not be placed between voice coil motor and the vibrating diaphragm to be measured by stating；It is preferred that, the voice coil motor excitation system is humorous
Vibration frequency need to be less than the resonant frequency of vibrating diaphragm to be measured；
It is preferred that, voice coil motor pushes directly on Platform Vibration to be measured, and platform to be measured drives and is fixed on treating on platform to be measured
Survey diaphragm oscillations；When the voice coil motor driving frequency is identical with vibrating diaphragm resonant frequency, vibrating diaphragm resonance；Laser displacement sensor
The information such as amplitude of the vibrating diaphragm under different driving frequencies can be detected, by the way that vibrating diaphragm can be drawn to test data progress processing
Resonant frequency Fo values and vibrating diaphragm Q value；
It is preferred that, also with data processor, test result is handled；It is preferred that, data processor is by treating
Survey the vibration information that the diaphragm of loudspeaker produces to be handled, vibrating diaphragm resonant frequency Fo values can be obtained, Q value, pliable
Mechanics and the parameters,acoustics such as Cms, oscillating mass Mms, displacement curve；
During test, voice coil motor receives ac signal, and voice coil loudspeaker voice coil 802 is formed by top flat 803, magnet 804 and magnetic bowl 805
Stress and vibrated in magnetostatic field.Voice coil loudspeaker voice coil 802 vibrates vibrating mass 801, cantilever 7, vibrating diaphragm fixing tool 307, and finally makes vibrating diaphragm
Vibrating diaphragm to be measured 6 on fixing tool vibrates.When the driving frequency of voice coil motor 104 is identical with the resonant frequency of vibrating diaphragm 6 to be measured
When, vibrating diaphragm 6 to be measured resonates.Now, laser displacement sensor 4 can detect the shaking under different driving frequencies of vibrating diaphragm 6 to be measured
The information such as width, by the way that vibrating diaphragm resonant frequency Fo values and vibrating diaphragm Q value can be drawn to test data progress processing.
In the present embodiment, voice coil motor 104 pushes directly on platform 3 to be measured and vibrated, it is not necessary to which air directly swashs as medium
Vibrating diaphragm 6 to be measured is encouraged to vibrate.It is adapted to full range tape test as driving source by voice coil motor 104, measuring stability is more preferable.
In the present embodiment, for vibrating diaphragm 6 to be measured, it is necessary to first carry out preliminary survey calibration.The pickup vibrating diaphragm of laser displacement sensor 4 position
Shifting, speed, acceleration signal, and feed back to data processor 5.Data processor 5 adjusts excitation amplitude according to feedback signal, protects
Demonstrate,proving different vibrating diaphragms to be measured 6 has suitable amplitude, the detection signal-to-noise ratio of improving laser displacement transducer 4.
In the present embodiment, when being tested, such as vibrating diaphragm 6 to be measured is not in place, and result is surveyed in laser displacement sensor inspection 4
Occur abnormal.Abnormal signal is fed back to data processor 5 by laser displacement sensor 4, and it is to be measured to point out user to reappose
Vibrating diaphragm 6, confirms that after the laying state of vibrating diaphragm 6 to be measured is good test can be continued.
Figure 13 is the cantilever outside drawing that the present embodiment is provided, and cantilever outer end is fixed on pressing tool 301, lower pressing tool
Between 302, the vibrating mass 801 of cantilever core and vibrating diaphragm fixing tool 307, voice coil motor 104 is fixed.Cantilever 7 is by some
Bar muscle connects central area and perimeter.Pass through the shape of muscle, quantitative design adjustment or cantilever material in itself, thickness
Adjustment, adjusts the resonant frequency of voice coil motor oscillating component, the oscillating component resonant frequency of voice coil motor 104 is less than vibrating diaphragm to be measured
6 resonant frequency, finally enables laser displacement sensor 4 accurately detect the physics such as the resonant frequency of vibrating diaphragm 6 to be measured ginseng
Number.
Figure 14, Figure 15 are the cantilever beam system modal vibration mode simulation result that the present embodiment is provided, cantilever vibration system
System includes：Cantilever 7, vibrating diaphragm fixing tool 307, vibrating diaphragm to be measured 6, vibrating mass 801, voice coil loudspeaker voice coil 802.Wherein, cantilever 7 is by 20 " S "
Shape muscle is constituted, and chooses SUS301 stainless steels, thickness is 0.2mm.Vibrating diaphragm fixing tool 307 chooses SUS301 stainless steels, vibrating mass
801 choose copper, and voice coil loudspeaker voice coil 802 is copper hot blast line, and vibrating diaphragm 6 to be measured is 4um PC.
The cantilever beam system cantilever fundamental vibration Modal Analysis result that Figure 14 provides for the present embodiment, jib system fundamental frequency
Fo values simulation result is 176Hz.Wherein, dark color is amplitude large area, and light areas is amplitude relative small area.Cantilever shakes
When dynamic system is vibrated near fundamental frequency, i.e. 176Hz, the center section amplitude of cantilever 7 is maximum, and edge is close to upper and lower pressing tool
301st, 302 region is substantially without amplitude.
The fundamental vibration Modal Analysis result of vibrating diaphragm to be measured 6 for the cantilever beam system that Figure 15 provides for the present embodiment, it is to be measured
The frequency Fo value simulation results of vibrating diaphragm 6 are about 1400Hz.Jib system swashs near 1400Hz and when reaching vibrating diaphragm fundamental resonance frequency
Vibrator film produces resonance.Wherein, dark color is amplitude large area, and light areas is amplitude relative small area.Vibrating diaphragm 6 to be measured
Near fundamental frequency, i.e. 1400Hz, vibrating diaphragm central region amplitude is maximum, and the edge of vibrating diaphragm 6 and cantilever 7 to be measured are substantially without amplitude.
The diaphragm of loudspeaker tester product measured result encouraged with voice coil motor that Figure 16 provides for the present embodiment, test
Frequency range is 1000Hz-2000Hz.In figure, when C7 is does not add vibrating diaphragm, the acceleration frequency response of the flat site of vibrating diaphragm fixing tool 307
Curve, C8 is the increase rear film central point acceleration displacement curve of vibrating diaphragm 6 to be measured.Vibrating diaphragm 6 to be measured chooses a 9mm diameters
4um PC earphone diaphragms.It can be seen from fig. 11 that not adding test value of the acceleration of vibrating diaphragm in 1000Hz-2000Hz frequency ranges
In 50m/s2To 100m/s2Fluctuation.After vibrating diaphragm 6 to be measured are increased, there is peak value in 1420Hz in acceleration, acceleration peak value by
Cause in vibrating diaphragm resonance, 1420Hz is the resonant frequency Fo values of such vibrating diaphragm to be measured.Meanwhile, can be to acceleration frequency response curve
Data processing is carried out, the other specifications such as Q value are obtained.
By comparing emulation and measured result, emulate vibrating diaphragm Fo values to be measured and actual measurement Fo values are basically identical.
Technical principle of the present utility model is described above in association with specific embodiment.These descriptions are intended merely to explain this reality
With new principle, and the limitation to the utility model protection domain can not be construed in any way.Based on explanation herein,
Those skilled in the art, which would not require any inventive effort, can associate other embodiments of the present utility model,
These modes are fallen within protection domain of the present utility model.
Claims (10)
1. a kind of diaphragm of loudspeaker tester with controlled excitation source, for test loudspeaker vibrating diaphragm, it is characterised in that bag
Include：
Platform to be measured, controlled excitation source, laser displacement sensor, control device；
Vibrating diaphragm to be measured is fixed on platform to be measured, and laser displacement sensor is fixed on platform to be measured；Vibrating diaphragm to be measured and laser position
Displacement sensor is co-axially located on platform to be measured；
Control signal is inputted controlled excitation source by control device, and controlled excitation source produces pumping signal according to the control signal；
Vibrating diaphragm to be measured produces vibration as the pumping signal excitation produced by controlled excitation source；
Laser displacement sensor detects vibration information during diaphragm oscillations.
2. tester according to claim 1, it is characterised in that
The controlled excitation source is loudspeaker driving source；The loudspeaker driving source is that the loudspeaker fed back with baroceptor swashs
Encourage system；
Also include baroceptor, the air pressure change between baroceptor detection controlled excitation source and vibrating diaphragm；
A closed cavity structure is formed between the loudspeaker driving source and the vibrating diaphragm to be measured；Air pressure is set inside closed cavity
Sensor, baroceptor is used to detect that seal cavity inner and outer air pressure is poor；By test platform in the loudspeaker driving source and institute
State one closed cavity structure of formation between vibrating diaphragm to be measured.
3. tester according to claim 2, it is characterised in that
The baroceptor can be：Probe type microphone, Electret Condencer Microphone, the microphone of mems structures, mems air pressure
Sensor or the combination of mems baroceptors；
Described mems baroceptors combination, including a broadband mems baroceptor, and a high-resolution mems
Microphone；The broadband mems baroceptors frequency band is 0Hz~1kHz, and the high-resolution mems microphone resolution ratio is excellent
In 1mPa；
Also there is data processor, test result is handled；Data processor is by producing to the diaphragm of loudspeaker to be measured
Vibration information is handled, and can obtain vibrating diaphragm resonant frequency Fo values, Q value, pliable Cms, oscillating mass Mms, position
Move curve；
The laser displacement sensor is the laser displacement sensor based on trigonometry principle, or based on laser doppler
Laser vibrometer sensor.
4. according to the tester described in claim 1, it is characterised in that
The controlled excitation source is the stepping push-rod electric machine excitation system fed back with baroceptor；
Test chamber is formed by platform to be measured between stepping push-rod electric machine and vibrating diaphragm to be measured；Baroceptor is placed in test chamber, is used
It is poor in detection seal cavity inner and outer air pressure；
The stepping push-rod electric machine pusher cylinder produces controlled air-flow；
The test chamber that the air-flow passes through sealed conducting tube to platform to be measured；Sealing duct can be silicone tube or metal tube.
5. according to the tester described in claim 4, it is characterised in that
Table top fixed placement vibrating diaphragm to be measured to be measured, the coaxial top of vibrating diaphragm to be measured sets laser displacement sensor, for detecting
Vibrating diaphragm amplitude, speed, acceleration；
Also there is data processor, test result is handled；Data processor is by producing to the diaphragm of loudspeaker to be measured
Vibration information is handled, and can obtain vibrating diaphragm resonant frequency Fo values, Q value, pliable Cms, oscillating mass Mms, position
Move curve；
The laser displacement sensor is the laser displacement sensor based on trigonometry principle, or based on laser doppler
Laser vibrometer sensor.
6. according to the tester described in claim 1, it is characterised in that
The controlled excitation source is the cylinder excitation system fed back with baroceptor；
Sealing test chamber is formed by platform to be measured between cylinder and vibrating diaphragm to be measured；Sealing test intracavitary places baroceptor, uses
It is poor in detection seal cavity inner and outer air pressure；
The cylinder pusher cylinder produces controlled air-flow；
The test chamber that the air-flow passes through sealed conducting tube to platform to be measured；Sealing duct can be silicone tube or metal tube.
7. according to the tester described in claim 6, it is characterised in that
Table top fixed placement vibrating diaphragm to be measured to be measured, the coaxial top of vibrating diaphragm to be measured sets laser displacement sensor, for detecting
Vibrating diaphragm amplitude, speed, acceleration；
Also there is data processor, test result is handled；Data processor is by producing to the diaphragm of loudspeaker to be measured
Vibration information is handled, and can obtain vibrating diaphragm resonant frequency Fo values, Q value, pliable Cms, oscillating mass Mms, position
Move curve；
The laser displacement sensor is the laser displacement sensor based on trigonometry principle, or based on laser doppler
Laser vibrometer sensor；
In test, cylinder loading air pressure；Vibrating diaphragm above annular seal space, which is promoted, produces deformation, baroceptor, laser
Displacement transducer detects initial gas pressure initial value and displacement initial value simultaneously；Annular seal space is present in special leakage device, cavity
Slow gas leakage, it is free laying state that vibrating diaphragm, which is slowly replied,；Air pressure change value and position are detected simultaneously during vibrating diaphragm is replied
Move changing value；To pliable Cms, the resonant frequency value Fo of vibrating diaphragm can be obtained after the processing of above testing result.
8. according to the tester described in claim 1, it is characterised in that
The controlled excitation source is voice coil motor excitation system；Driving source is used as by voice coil motor；
The voice coil motor excitation system resonant frequency need to be less than the resonant frequency of vibrating diaphragm to be measured；
Vibrating diaphragm fixed placement to be measured is between platform to be measured, the voice coil motor and the vibrating diaphragm to be measured without air-tightness requirement；Institute
Baroceptor need not be placed between voice coil motor and the vibrating diaphragm to be measured by stating；
The coaxial top of vibrating diaphragm to be measured sets laser displacement sensor, for detecting vibrating diaphragm amplitude, speed, acceleration.
9. according to the tester described in claim 8, it is characterised in that
Also include cantilever, cantilever outer end is fixed on test platform, cantilever core fixes vibrating diaphragm to be measured；Cantilever is by least one
Individual muscle connection central area and perimeter；
Adjusted by the shape of muscle, quantitative design, or the adjustment of cantilever material in itself, thickness, adjustment voice coil motor vibration section
The resonant frequency divided, makes voice coil motor oscillating component resonant frequency be less than vibrating diaphragm resonant frequency to be measured；
Voice coil motor pushes directly on Platform Vibration to be measured, and platform to be measured drives the diaphragm oscillations to be measured being fixed on platform to be measured；
When the voice coil motor driving frequency is identical with vibrating diaphragm resonant frequency, vibrating diaphragm resonance；Laser displacement sensor can be detected
Amplitude of the vibrating diaphragm under different driving frequencies, by that vibrating diaphragm resonant frequency Fo values can be drawn with shaking test data progress processing
Film quality factor Q value.
10. according to the tester described in claim 8, it is characterised in that
Also there is data processor, test result is handled；
The laser displacement sensor is the laser displacement sensor based on trigonometry principle, or based on laser doppler
Laser vibrometer sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621445028.7U CN206433180U (en) | 2016-12-27 | 2016-12-27 | A kind of diaphragm of loudspeaker tester with controlled excitation source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621445028.7U CN206433180U (en) | 2016-12-27 | 2016-12-27 | A kind of diaphragm of loudspeaker tester with controlled excitation source |
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| CN206433180U true CN206433180U (en) | 2017-08-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507262A (en) * | 2016-12-27 | 2017-03-15 | 深圳精拓创新科技有限公司 | A kind of diaphragm of loudspeaker tester with controlled excitation source |
| CN107655626A (en) * | 2017-10-26 | 2018-02-02 | 江苏德尔科测控技术有限公司 | A kind of automation demarcation of pressure sensor and test equipment and its method of testing |
| CN108462930A (en) * | 2017-12-19 | 2018-08-28 | 深圳市豪恩声学股份有限公司 | Earphone diaphragm compression test system, method and computer storage media |
| CN112188377A (en) * | 2020-09-27 | 2021-01-05 | 广州沈思贸易有限公司 | Sound detection machine utilizing vibration to generate heat to induce vibration diaphragm |
-
2016
- 2016-12-27 CN CN201621445028.7U patent/CN206433180U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106507262A (en) * | 2016-12-27 | 2017-03-15 | 深圳精拓创新科技有限公司 | A kind of diaphragm of loudspeaker tester with controlled excitation source |
| CN106507262B (en) * | 2016-12-27 | 2022-06-28 | 深圳精拓创新科技有限公司 | Loudspeaker diaphragm tester with controlled excitation source |
| CN107655626A (en) * | 2017-10-26 | 2018-02-02 | 江苏德尔科测控技术有限公司 | A kind of automation demarcation of pressure sensor and test equipment and its method of testing |
| CN108462930A (en) * | 2017-12-19 | 2018-08-28 | 深圳市豪恩声学股份有限公司 | Earphone diaphragm compression test system, method and computer storage media |
| CN108462930B (en) * | 2017-12-19 | 2020-09-04 | 深圳市豪恩声学股份有限公司 | Earphone diaphragm compression-resistant test system, method and computer storage medium |
| CN112188377A (en) * | 2020-09-27 | 2021-01-05 | 广州沈思贸易有限公司 | Sound detection machine utilizing vibration to generate heat to induce vibration diaphragm |
| CN112188377B (en) * | 2020-09-27 | 2022-01-14 | 郑州大轩电子科技有限公司 | Sound detection machine utilizing vibration to generate heat to induce vibration diaphragm |
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