CN109186972A - One kind is for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay - Google Patents
One kind is for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay Download PDFInfo
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- CN109186972A CN109186972A CN201810893215.9A CN201810893215A CN109186972A CN 109186972 A CN109186972 A CN 109186972A CN 201810893215 A CN201810893215 A CN 201810893215A CN 109186972 A CN109186972 A CN 109186972A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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Abstract
The present invention provides a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it include: standing wave pipe assembly, air supply system, gas flow optimized and acquisition system, acoustic data acquisition system and the poster processing soft platform, standing wave pipe assembly two sides are equipped with sound system, air supply system is connected on sound system, gas flow optimized and acquisition system, acoustic data acquisition system and the poster processing soft platform are connected on standing wave pipe assembly, sound system issues sound wave, air supply system generates air-flow, the gentle stream of sound wave enters standing wave tube assembly, air-flow is monitored by gas flow optimized and acquisition system, calculation processing is carried out by acoustic data acquisition system acquisition voice signal and by the data obtained transmission belt the poster processing soft platform.The present invention can customize the frequency range of test process, common air inlet tuning element and exhaust silencer are tested with low frequency, and turbocharger broadband muffler need to carry out high-frequency test using mature double sound source transfer matrix method.
Description
Technical field
The present invention relates to acoustical behavior engine bench test technical fields, specially a kind of to open for air inlet system and exhaust system acoustical behavior
Hair and verifying testboard bay.
Background technique
In recent years, with the fast development of auto industry, the pollution problem of automobile noise is also increasingly severe.Intake and exhaust system
The noise of system is the important composition part of vehicle noise, particularly important to air inlet system and exhaust system progress noise reduction, the main means of noise reduction
It is to use silencer element in the duct, and the exploitation of silencer element and verifying are built upon the accurate test base to its acoustical behavior
On plinth.
In addition, turbocharger is due to turbine and calms the anger and takes turns high revolving speed and air dynamic behaviour, it is forward and backward all in compressor
High-frequency noise can be generated, it is therefore desirable to arrange that wideband high frequency silencer, the acoustic attenuation performance of the silencer are needed according to turbine and mark
Determine characteristic to be matched.For turbocharger, emulation can not more accurate modeling and forecasting Induction and exhaust noises, need to survey it
It has a try and tests to formulate air inlet system and exhaust system grade target, evade later development risk.In air inlet system and exhaust system, pipe interior air-flow is to influence to disappear
One key factor of sound component acoustical behavior, and existing test equipment can not be in the pipeline of accurate calibration tape air-flow at present
Noise.
With the maturation of automotive development technology and the shortening of development cycle, main vehicle research and development institution is for engineering both at home and abroad
All significantly reduced with vehicle quantity, or even cancels engineering soft mode after thering is automobile main frame maker to propose the several years and make vehicle.And
Requirement of the consumer to automotive performance is higher and higher, and takes a fancy to quantization specific performance parameter further, to the performance development of main engine plants
More stringent requirements are proposed with verifying.Therefore in the case where lacking engineering vehicle, soft mode vehicle, the exploitation of testboard bay is high-performance
Vehicle whole development necessary condition, testboard bay technology seem ever more important.
Summary of the invention
Technical problem solved by the invention is to provide a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying use
Testboard bay, to solve the problems in above-mentioned background technique.
Technical problem solved by the invention is realized using following technical scheme: one kind being used for air inlet system and exhaust system acoustics
It can develop and verifying testboard bay, comprising: sound system, standing wave pipe assembly, air supply system, gas flow optimized and acquisition system,
Acoustic data acquisition system and the poster processing soft platform, standing wave pipe assembly two sides are equipped with sound system, connect on sound system
It is connected to air supply system, gas flow optimized and acquisition system, acoustic data acquisition system and rear place are connected on the standing wave pipe assembly
Software platform is managed, the sound system issues sound wave, and air supply system generates air-flow, and the gentle stream of sound wave enters standing wave tube assembly,
Air-flow is monitored by gas flow optimized and acquisition system, as acoustic data acquisition system acquisition voice signal and by obtained by
Output transmission the poster processing soft platform carries out calculation processing.
The sound system includes acoustic source array A and acoustic source array B and signal source, and acoustic source array includes tweeter
(subsidiary integrated form compressible drive mechanism), woofer (subsidiary external compressible drive mechanism) are placed in speaker assembly；Sound
Box assembly is adjustable oneself height by monoblock type liftable pedestal on a horizontal line, avoid hanging with standing wave pipe assembly
The appearance of arm beam.Signal source includes signal generator, scaling down processing device, power amplifier, and signal generator makes a sound signal
Divided processor, power amplifier and loudspeaker generate sound wave, include power supply and relay in power amplifier cabinet.
The standing wave pipe assembly includes standing wave tube A and standing wave tube B, the sound source being mounted between acoustic source array and standing wave tube
Coupling tube A and sound source coupling tube B, the exemplar adapter being mounted between two standing wave tubes are respectively equipped with 3 on every standing wave tube
Microphone installation site can measure different transmitting frequency of loss ranges by different microphone spacing, and sound wave is through sound source
Coupling tube enters standing wave tube A, enters standing wave tube B by the exemplar being clipped in exemplar adapter, the microphone on standing wave tube is adopted
Voice signal is lost by the transmitting that exemplar is calculated between the transmission function microphone.
The air supply system includes blower, blower vibration isolation sound arrester, air-flow pressurizer tank and frequency converter；Blower generates gas
Stream, air-flow pressurizer tank is up to pressure stabilizing measure is provided, so that air-flow is sufficient, stable and low noise；Frequency converter programming Control blower generates
Air-flow.
The gas flow optimized and acquisition system includes blower signal control cabinet, PLC remote control module, pressure sensing
Device, flow sensor and temperature sensor, blower signal control cabinet is furnished with motor speed and temperature, conversion frequencies parameter are shown,
And potentiometer carries out frequency adjusting, PLC remote control module is integrated in vasculum, adopts and communicates with number, by pressure sensing
The monitoring of device, flow sensor, temperature sensor and each microphone range, the air-flow generated to air supply system control.
The sound system includes mutually independent acoustic source array A and acoustic source array B, output peak-peak 140dB's
Sound source power, the tweeter and woofer, respectively 2 groups 4 and 2 groups 2, tweeter frequency response model
It encloses for 280 ~ 8000Hz, woofer frequency response range is 50 ~ 2500Hz, frequency of source range needed for covering test；Institute
The power amplifier stated is high-fidelity power amplifier, and total harmonic distortion and intermodulation distortion are lower than 0.1%；The speaker is total
As double layer design, interior outer container NVH processing, there is good sound insulation effect；The liftable pedestal may be implemented it is fixed and
Mobile both of which switching.
The full test model machine inlet pressure 50Kpa, the maximum rate of discharge 350g/ provided that the air supply system provides
S meets the traffic requirement of all sale vehicle matching engines on the market.
The poster processing soft platform carries out full frequency band transmitting loss analysis, the transmitting loss point of customized frequency range respectively
Analysis, the analysis of working temperature acoustical behavior and transfer matrix level Four subparameter calculate, full range segment limit are as follows: 50 ~ 4000Hz, it is customized
Frequency range is other frequency ranges in all frequency range, and low, high frequency transmitting loss test frequency overlapping range is 200 ~ 1000Hz, in weight
Folded region is low, high-frequency test peak-peak deviation is less than 2dB, and algorithm main body uses weighted form, wherein 200 ~ 400Hz is with low
Based on frequency, 400 ~ 500Hz uses weighted averaging method, and based on high frequency, the software can be compatible with LMS etc. and adopt 500 ~ 1000Hz
The data format of collecting system has convenient data-interface with it.
The standing wave thickness of pipe wall 14mm, lightweight and satisfaction radiate and avoid coupled vibro-acoustic requirement；In the standing wave tube
Diameter 50mm, low frequency and high frequency microphone spacing are respectively 12inch and 1.5inch；The standing wave tube inner surface of tube wall mirror
Reason, it is highly polished, avoid air stream surface friction regenerated noise and sound reflecting；The microphone and standing wave tube wall is mounted flush
On the one hand Flush-Mount, three seals design reduce influence of the introducing of microphone to sound and air-flow, on the other hand drop
Influence of the low external context noise to microphone, further increases system signal noise ratio；The standing wave pipeline embeds level meter,
Air-flow and sound source are reduced in test penstock reflection；The standing wave tube is connect using 3 points with sound source coupling tube, exemplar adapter
Formula clamp button of the spring and embedded seal ring, good airproof performance and facilitate operation；The exemplar adapter is designed by acoustics transition request,
Cover 35 ~ 80mm caliber range.
The fan air inlet, gas outlet pipeline use muffler noise reduction；The blower vibration isolation sound arrester has two
Layer vibration insulation structure, primary structure are rectangle rigid body frame, and four angles use air spring, and frame intrinsic frequency is 1Hz, second level knot
Structure is the rubber vibration isolation used between fan body and frame, air-flow output and silencer；The air-flow pressurizer tank can reduce gas
Influence of the flow noise to test pipe-line system, box house carries out sound absorption processing, and air stream outlet uses horn transition form, and
Third level silencer is arranged before entering standing wave tube.
The blower signal control cabinet shown equipped with motor speed and temperature, conversion frequencies parameter and potentiometer into
Line frequency is adjusted, the display of PLC the remote control module integrated temperature, back pressure, flow velocity, rotary speed parameter, and is realized and counted
Communication is adopted, feedback shows the range state of each sensor.
It is compared to open technology, there are following advantages by the present invention:
(1) testboard bay is using mature double sound source transfer matrix method, 6 laboratory's grade sound sources of matching pickup and standing wave piping
System, can get accurate full frequency band 50Hz -4000Hz acoustic attenuation performance；
(2) testboard bay is directed to measurand feature, can customize frequency range and is tested.Common air inlet tuning element and exhaust
Silencer is tested with low frequency, and turbocharger broadband muffler need to carry out high-frequency test.Full set exhaust contains dissipative muffler,
Turbocharger gas handling system can be analyzed with Whole frequency band；
(3) test stand system calculates the transmission function of 6 microphones, fully considers microphone spacing to the shadow of parameters,acoustic
It rings, to obtain true transfer matrix and transmitting loss in the effective frequency range of measurand；
(4) testboard bay can match user's microphone, test the sound source power of the exportable maximum 140dB of sound source, can guarantee air-flow
With the signal-to-noise ratio under high sound deadening capacity exemplar test condition；
(5) testboard bay is programmed by PLC, is controlled gas flowing, the pipe under accurate simulation and acquisition engine operating condition
Road flow velocity, realize each revolving speed or real vehicle noise problem correspond under revolving speed acoustic element transmitting loss test, be punctured element and
The acoustic attenuation performance of dissipative muffler provides more realistic assessment；
(6) testboard bay can be assessed when sound system is closed for the regenerated noise of exhaust silencer, be suitable for big row
Measure the qualitative analysis of turbocharger exhaust pneumatic noise and option screening；
(7) testboard bay is fluctuated for the pulsation of blower low speed, is provided three-level and is eliminated the noise and pressure stabilizing measure, to guarantee to enter test
The air-flow of exemplar is sufficient, stablizes, low noise.And downstream airflow is exported and carries out end noise elimination processing；
(8) testboard bay can carry out pressure drop to exemplar or back pressure is tested；
(9) the poster processing soft platform of testboard bay can repair transmitting loss result according to working temperature and operating condition back pressure
Just；
(10) testboard bay is directed to influence of the blower to peripheral environment, provides the vibration isolation sound insulation processing of profession.
Detailed description of the invention
Fig. 1 is systematic schematic diagram of the invention.
Fig. 2 is work flow diagram of the invention.
Fig. 3 is sound system systematic schematic diagram of the invention.
Fig. 4 is air supply system systematic schematic diagram of the invention
Fig. 5 is gas flow optimized and acquisition system systematic schematic diagram of the invention.
Specific embodiment
In order to make, technological means of the invention, creation characteristic, workflow, application method reach purpose and effect is easy to bright
White understanding, below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described,
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " company ", " connection "
It shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected to be mechanical connection,
It is also possible to be electrically connected;It can be directly connected, can also indirectly connected through an intermediary, it can company inside two elements
It is logical, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the present invention
In embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
As described in Fig. 1-5, one kind, which is developed and verified for air inlet system and exhaust system acoustical behavior, uses testboard bay 100, comprising: sound
Source system 1, standing wave pipe assembly 2, air supply system 3, gas flow optimized and acquisition system 4, acoustic data acquisition system 5 and post-processing are soft
Part platform 6,2 two sides of standing wave pipe assembly are equipped with sound system 1, are connected with air supply system 3, gas flow optimized on sound system 1
With acquisition system 4, acoustic data acquisition system 5 and the poster processing soft platform 6 are connected on the standing wave pipe assembly 2, it is described
Sound system 1 issue sound wave, air supply system 3 generate air-flow, sound wave it is gentle stream enter standing wave tube assembly 2, by gas flow optimized with
Acquisition system 4 can be monitored air-flow, by 5 collected sound signal of acoustic data acquisition system and by the data obtained transmission belt
The poster processing soft platform 6 carries out calculation processing.
The sound system 1 includes acoustic source array A101 and acoustic source array B102, respectively in the left and right of standing wave pipe assembly 2
Two sides can distinguish sounding.Acoustic source array includes that signal generator 103, tweeter 104, woofer 105 and power are put
Big device 106, is placed in speaker assembly 107.Signal generator 103 makes a sound signal and produces through power amplifier 106 and loudspeaker
Raw sound wave.Include power supply and relay in 106 cabinet of power amplifier, low high-frequency sound source can be switched.Pass through monoblock type liftable
Pedestal 108, speaker assembly 107 are adjustable oneself height on a horizontal line, avoid cantilever beam with standing wave pipe assembly 2
Occur.
The standing wave pipe assembly 2 includes two standing wave tube A201 and standing wave tube B202, is mounted on acoustic source array and standing wave
Two sound source coupling tube A203 and sound source coupling tube B204 between pipe, the exemplar adapter being mounted between two standing wave tubes
205,3 206 installation sites of microphone are respectively equipped on every standing wave tube, and difference can be measured by different microphone spacing
Transmitting frequency of loss range.Sound wave enters standing wave tube A201 through sound source coupling tube, passes through the sample being clipped in exemplar adapter 205
Part enters standing wave tube B202, and the microphone on standing wave tube adopts to obtain voice signal, passes through the calculating between the transmission function microphone
Obtain the transmitting loss of exemplar.
The air supply system 3 includes blower 301, blower vibration isolation sound arrester 302, air-flow pressurizer tank 303 and frequency converter
304.Blower 301 generates air-flow, and air-flow pressurizer tank 303 is up to pressure stabilizing measure is provided, so that air-flow is sufficient, stable and low noise.Become
The air-flow that 304 PLC technology blower 301 of frequency device generates.
The gas flow optimized and acquisition system 4 includes blower signal control cabinet 401, PLC remote control module 402, pressure
Force snesor 403, flow sensor 404 and temperature sensor 405, blower signal control cabinet 401 equipped with motor speed and temperature,
The parameters such as conversion frequencies show and potentiometer carry out frequency adjusting, can near field blower is debugged and is controlled.PLC is long-range
Control module 402 is integrated in vasculum, adopts and communicates with number, by pressure sensor 403, flow sensor 404, temperature sensing
The monitoring of 405 range of device, the air-flow generated to air supply system 3 control.
The sound system includes two mutually independent acoustic source array A101 and acoustic source array B102, and output is maximum
The sound source power of 140dB can guarantee the signal-to-noise ratio under air-flow and high sound deadening capacity exemplar test condition；The tweeter and low
Band loudspeaker, respectively 2 groups 8 and 2 groups 2, tweeter frequency response range is 280 ~ 8000Hz, woofer frequency
Rate response range is 50 ~ 2500Hz, frequency of source range needed for covering test；The power amplifier is that high-fidelity power is put
Big device, total harmonic distortion and intermodulation distortion are lower than 0.1%；The speaker assembly is double layer design, interior outer container NVH processing, tool
There is good sound insulation effect；Fixed and mobile both of which switching may be implemented in the liftable pedestal.
The full test model machine inlet pressure 50Kpa, the maximum rate of discharge 350g/ provided that the air supply system provides
S meets the traffic requirement of all sale vehicle matching engines on the market.
The poster processing soft platform carries out low frequency transmitting loss analysis, high frequency transmitting loss analysis, full frequency band respectively
It transmits loss analysis, the analysis of working temperature acoustical behavior and transfer matrix to calculate, full range segment limit are as follows: 50 ~ 4000Hz is low, high
Keep pouring in that pass the frequency overlapping range of loss test be 200 ~ 1000Hz, overlapping region is low, high-frequency test peak-peak deviation is small
In 2dB, algorithm main body uses weighted form, wherein 200 ~ 400Hz, based on low frequency, 400 ~ 500Hz uses weighted mean square
Method, for 500 ~ 1000Hz based on high frequency, the software can be compatible with the data format of the acquisition systems such as LMS, have easily with it
Data-interface.
The standing wave tube material is 6063 aluminium, wall thickness 14mm, lightweight and satisfaction radiation and avoids coupled vibro-acoustic requirement；Institute
The standing wave bore 50mm stated, low frequency and high frequency microphone spacing are respectively 12inch and 1.5inch；The standing wave tube wall
Inner surface mirror surface treatment, it is highly polished, avoid air stream surface friction regenerated noise and sound reflecting；The microphone and standing wave tube
Wall is mounted flush Flush-Mount, on the one hand three seals design reduces influence of the introducing of microphone to sound and air-flow,
On the other hand influence of the external context noise to microphone is reduced, system signal noise ratio is further increased；The standing wave pipeline
Embedded level meter reduces air-flow and sound source in test penstock reflection；The standing wave tube connects with sound source coupling tube, exemplar adapter
It connects using bikini clamp button of the spring and embedded seal ring, good airproof performance and facilitates operation；The exemplar adapter presses acoustics mistake
Requirement design is crossed, 38 ~ 80mm caliber range is covered.
The fan air inlet, gas outlet pipeline use muffler noise reduction；The blower vibration isolation sound arrester has two
Layer vibration insulation structure, primary structure are rectangle rigid body frame, and four angles use air spring, and frame intrinsic frequency is 1Hz, second level knot
Structure is the rubber vibration isolation used between fan body and frame, air-flow output and silencer；The air-flow pressurizer tank can reduce gas
Influence of the flow noise to test pipe-line system, box house carries out sound absorption processing, and air stream outlet uses horn transition form, and
Third level silencer is arranged before entering standing wave tube.
The frequency converter has 6 programmable logic inputs, compatible with 1 grade of PLC, meets IEC/EN61131-2 standard.
The blower signal control cabinet is shown equipped with the parameters such as motor speed and temperature, conversion frequencies and potentiometer
Carry out frequency adjusting, can near field blower is debugged and is controlled；The PLC remote control module integrated temperature, back pressure, stream
The display of the parameters such as speed, revolving speed, and realize to adopt with number and communicate, feedback shows the range state of each microphone.For blower frequency
It adjusts, by the Show Button on touch screen, it can be achieved that the control of SCR CTRL touch screen and two kinds of adjusting sides of KNOB CTRL knob
Formula；Pressure sensor, flow sensor and the temperature sensor has enough measurement accuracy.
The above shows and describes the basic principle, main features and advantages of the invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.Claimed range of the invention by appended claims and
Its equivalent thereof.
Claims (10)
1. one kind, which is developed and verified for air inlet system and exhaust system acoustical behavior, uses testboard bay, it is characterised in that: include: sound source system
System, standing wave pipe assembly, air supply system, gas flow optimized and acquisition system, acoustic data acquisition system and the poster processing soft platform, institute
It states standing wave pipe assembly two sides and is equipped with sound system, be connected with air supply system, gas flow optimized and acquisition system on sound system, it is described
Acoustic data acquisition system and the poster processing soft platform are connected on standing wave pipe assembly, the sound system issues sound wave, gas
Source system generates air-flow, and the gentle stream of sound wave enters standing wave tube assembly, is monitored by gas flow optimized and acquisition system to air-flow,
Calculation processing is carried out by acoustic data acquisition system acquisition voice signal and by the data obtained transmission belt the poster processing soft platform.
2. it is according to claim 1 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the sound system includes acoustic source array A and acoustic source array B and signal source, respectively in the left and right of standing wave pipe assembly
Two sides, acoustic source array include tweeter (subsidiary integrated form compressible drive mechanism), woofer (subsidiary external compression
Driving mechanism) it is placed in speaker assembly；Speaker assembly is adjustable oneself height thus and standing wave by monoblock type liftable pedestal
Pipe assembly avoids the appearance of cantilever beam on a horizontal line, and signal source includes that signal generator, scaling down processing device, power are put
Big device, signal generator make a sound the divided processor of signal, power amplifier and loudspeaker and generate sound wave, power amplifier
It include power supply and relay in cabinet.
3. it is according to claim 1 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the standing wave pipe assembly includes standing wave tube A and standing wave tube B, the sound source being mounted between acoustic source array and standing wave tube
Coupling tube A and sound source coupling tube B, the exemplar adapter being mounted between two standing wave tubes are respectively equipped with 3 on every standing wave tube
Microphone installation site can measure different transmitting frequency of loss ranges by different microphone spacing, and sound wave is through sound source
Coupling tube enters standing wave tube A, enters standing wave tube B by the exemplar being clipped in exemplar adapter, the microphone on standing wave tube is adopted
Voice signal is lost by the transmitting that exemplar is calculated between the transmission function microphone.
4. it is according to claim 1 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the air supply system includes blower, blower vibration isolation sound arrester, air-flow pressurizer tank and frequency converter；Blower generates gas
Stream, air-flow pressurizer tank is up to pressure stabilizing measure is provided, so that air-flow is sufficient, stable and low noise；Frequency converter programming Control blower generates
Air-flow.
5. it is according to claim 1 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the gas flow optimized and acquisition system include blower signal control cabinet, PLC remote control module, pressure sensor,
Flow sensor and temperature sensor, blower signal control cabinet is furnished with motor speed and temperature, conversion frequencies parameter are shown, and
Potentiometer carries out frequency adjusting, and PLC remote control module is integrated in vasculum, adopts and communicates with number, by pressure sensor,
The monitoring of flow sensor, temperature sensor and each microphone range, the air-flow generated to air supply system control.
6. it is according to claim 2 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the sound system includes mutually independent acoustic source array A and acoustic source array B, exports the sound of peak-peak 140dB
Source energy, the tweeter and woofer, respectively 2 groups 4 and 2 groups 2, tweeter frequency response range
For 280 ~ 8000Hz, woofer frequency response range is 50 ~ 2500Hz, frequency of source range needed for covering test；It is described
Power amplifier be high-fidelity power amplifier, total harmonic distortion and intermodulation distortion are lower than 0.1%；The speaker assembly
For double layer design, interior outer container NVH processing, there is good sound insulation effect；The liftable pedestal may be implemented fixed and move
Dynamic both of which switching.
7. it is according to claim 4 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the full test model machine inlet pressure 50Kpa, the maximum rate of discharge 350g/ provided that the air supply system provides
S meets the traffic requirement of all sale vehicle matching engines on the market.
8. it is according to claim 1 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the poster processing soft platform carries out full frequency band transmitting loss analysis respectively, customized frequency range transmits loss analysis,
The analysis of working temperature acoustical behavior and transfer matrix level Four subparameter calculate, full range segment limit are as follows: 50 ~ 4000Hz, customized frequency
Section is other frequency ranges in all frequency range, and low, high frequency transmitting loss test frequency overlapping range is 200 ~ 1000Hz, is being overlapped
Region is low, high-frequency test peak-peak deviation is less than 2dB, and algorithm main body uses weighted form, wherein 200 ~ 400Hz is with low frequency
Based on, 400 ~ 500Hz uses weighted averaging method, and for 500 ~ 1000Hz based on high frequency, the software can be compatible with the acquisition such as LMS
The data format of system has convenient data-interface with it.
9. it is according to claim 3 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the standing wave thickness of pipe wall 14mm, lightweight and meets radiation and avoids coupled vibro-acoustic requirement；The standing wave bore
50mm, low frequency and high frequency microphone spacing are respectively 12inch and 1.5inch；The standing wave tube inner surface of tube wall mirror
Reason, it is highly polished, avoid air stream surface friction regenerated noise and sound reflecting；The microphone and standing wave tube wall is mounted flush
On the one hand Flush-Mount, three seals design reduce influence of the introducing of microphone to sound and air-flow, on the other hand drop
Influence of the low external context noise to microphone, further increases system signal noise ratio；The standing wave tube and sound source coupling tube, sample
The connection of part adapter uses bikini clamp button of the spring and embedded seal ring, good airproof performance and facilitates operation；The exemplar adaptation
Device is designed by acoustics transition request, covers 35 ~ 80mm caliber range.
10. it is according to claim 4 a kind of for the exploitation of air inlet system and exhaust system acoustical behavior and verifying testboard bay, it is special
Sign is: the fan air inlet, gas outlet pipeline use muffler noise reduction；The blower vibration isolation sound arrester has two layers
Vibration insulation structure, primary structure are rectangle rigid body frame, and four angles use air spring, and frame intrinsic frequency is 1Hz, secondary structure
The rubber vibration isolation used between fan body and frame, air-flow output and silencer；The air-flow pressurizer tank can reduce air-flow
Influence of the noise to test pipe-line system, box house carry out sound absorption processing, and air stream outlet uses horn transition form, and
Third level silencer is arranged before into standing wave tube；The blower signal control cabinet is furnished with motor speed and temperature, conversion frequencies
Parameter is shown and potentiometer carries out frequency adjusting, the PLC remote control module integrated temperature, back pressure, flow velocity, revolving speed
The display of parameter, and realize to adopt with number and communicate, feedback shows the range state of each sensor.
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| CN110243611A (en) * | 2019-06-19 | 2019-09-17 | 江铃汽车股份有限公司 | A kind of booster noise control method |
| CN112001030A (en) * | 2020-08-04 | 2020-11-27 | 浙江大学 | Automobile muffler design method and device |
| CN112730625A (en) * | 2019-10-14 | 2021-04-30 | 中车长春轨道客车股份有限公司 | Sound absorption coefficient testing system and method and vehicle |
| CN112834624A (en) * | 2021-03-04 | 2021-05-25 | 上海核工程研究设计院有限公司 | Test bench and test method for sound insulation performance of pipeline heat-preservation binding structure |
| CN112903824A (en) * | 2021-01-14 | 2021-06-04 | 中国商用飞机有限责任公司 | Double-sound-source standing wave tube acoustic testing system |
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| CN112730625A (en) * | 2019-10-14 | 2021-04-30 | 中车长春轨道客车股份有限公司 | Sound absorption coefficient testing system and method and vehicle |
| CN112001030A (en) * | 2020-08-04 | 2020-11-27 | 浙江大学 | Automobile muffler design method and device |
| CN112903824A (en) * | 2021-01-14 | 2021-06-04 | 中国商用飞机有限责任公司 | Double-sound-source standing wave tube acoustic testing system |
| CN112834624A (en) * | 2021-03-04 | 2021-05-25 | 上海核工程研究设计院有限公司 | Test bench and test method for sound insulation performance of pipeline heat-preservation binding structure |
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