CN103644966B - Periodic signal enhancement detection device and method - Google Patents
Periodic signal enhancement detection device and method Download PDFInfo
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- CN103644966B CN103644966B CN201310739306.4A CN201310739306A CN103644966B CN 103644966 B CN103644966 B CN 103644966B CN 201310739306 A CN201310739306 A CN 201310739306A CN 103644966 B CN103644966 B CN 103644966B
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Abstract
The invention provides a periodic signal enhancement detection device and method. The detection device comprises a signal receiving and preprocessing module, a power amplifier, a vibration exciter, a three-steady cantilever beam physical device, a laser displacement sensor, an acceleration sensor and an oscilloscope, wherein an output interface of the signal receiving and preprocessing module is connected with an input interface of the power amplifier; an output interface of the power amplifier is connected with an input interface of the vibration exciter; the three-steady cantilever beam physical device is connected with the working platform of the vibration exciter through bolts; the laser displacement sensor is arranged on a proper stand so as to ensure that a laser beam is aligned with the free vibration end of a cantilever beam in the three-steady cantilever beam physical device; the acceleration sensor is connected onto the three-steady cantilever beam physical device through bolts; output interfaces of the laser displacement sensor and the acceleration sensor are respectively connected onto two different input channels of the oscilloscope. The detection device and method have the advantages of being simple in principle, physical in realization, good in detection effect, strong in universality and the like.
Description
Technical field
The present invention relates to Technique of Weak Signal Detection field, specifically, relate to a kind of enhancing pick-up unit and method of periodic signal.
Background technology
There are some periodic signals, the vibration that such as slewing produces or voice signal, the brain electricity produced in human body or electrocardiosignal, supersonic sounding signal etc. under water or in structure in engineering.These periodic signals carry very useful signal source information, thus can detect that periodic signal tool is of great significance accurately and effectively.Specifically, the fault detection and diagnosis technology of rotating machinery, can the running status of equipment and health and fitness information by analyzing the vibration or acoustic signal that collect.Slewing can produce periodic impact shock when breaking down, and has been reflected in the vibration or acoustic signal collected.By the detection to impulse period in signal, can judge whether this equipment has fault or there occurs which kind of fault, this is to support equipment safe operation, and the aspects such as power generating ratio loss are significant.But the signal collected by sensor inevitably contains noise, and noise makes to become very difficult to effective extraction of periodic signal and detection.
Accidental resonance is a kind of nonlinear method that can utilize Noise enhancement periodic signal, and the feature of its uniqueness makes it be applied to the cycle input fields such as mechanical fault diagnosis.The current method utilizing accidental resonance to carry out signal enhancing mainly concentrates on digital signal processing aspect.But, these methods based on computer platform often provide too desirable computing environment, accidental resonance implementation process is obtained and comprehensively optimizes to adapt to specific Noise signal; Meanwhile, the stochastic resonance method based on Digital Signal Processing often uses together in conjunction with other complicated algorithm, makes implementation process become more complicated, is not easy to on-line checkingi.
Detection of Weak Signals at present based on accidental resonance also has some to adopt the detection technique of mimic channel, and these technology realize accidental resonance detection by building complicated analog circuitry system.But the subject matter that this kind of technology exists is that the parameter adjustment of detection circuitry is not easy to realize robotization and intellectuality, thus often the universality of actual cycle signal is detected and there is very large restriction.
As from the foregoing, concerning the existing periodic signal detection technique based on accidental resonance, two kinds of technical schemes based on digital signal processing and analog circuitry system all have some limitations, and how realizing the technical scheme easy, universality is strong still needs further discussion.
Summary of the invention
The object of the invention is to provide a kind of new Noise periodic signal enhancement detection device based on Stochastic Resonance Theory and method, this device and method realizes accidental resonance based on a kind of physical unit instead of traditional digital signal processing or analog circuitry system, this device is installed on vibrator, directly can strengthen the periodic component in the Noise signal of input vibrator, performance period, the enhancing of signal detected.
The technical solution used in the present invention is: a kind of periodic signal enhancement detection device, and this pick-up unit comprises Signal reception and pretreatment module, power amplifier, vibrator, three steady semi-girder physical units, laser displacement sensor, acceleration transducer and oscillograph; Signal reception is connected with the input interface of power amplifier with the output interface of pretreatment module; The output interface of power amplifier is connected with the input interface of vibrator; Three steady semi-girder physical units are bolted on the worktable of vibrator; Laser displacement sensor is arranged on suitable support, guarantees that laser beam aims at the semi-girder free vibration end in three steady semi-girder physical units; Acceleration transducer is bolted on three steady semi-girder physical units; The output interface of laser displacement sensor and acceleration transducer is connected respectively in oscillographic two different input channels; Wherein,
Described Signal reception and pretreatment module, comprise signal receiving module, signal receiving processing module, signal change of scale module;
Described three steady semi-girder physical units, comprise left pedestal, elastic matrix, the first permanent magnet, the second permanent magnet, the 3rd permanent magnet, the first permanent magnet seat, the second permanent magnet seat, Right socle, the first adjusting bolt, the second adjusting bolt and the 3rd adjusting bolt; Elastic matrix adopts metal clips; Wherein elastic matrix one end is clamped on left pedestal and forms semi-girder; First permanent magnet is bonded on the free end of elastic matrix; Second permanent magnet and the 3rd permanent magnet are bonded on the first permanent magnet seat and the second permanent magnet seat respectively; First permanent magnet seat and the second permanent magnet seat are connected on Right socle respectively by the first adjusting bolt and the second adjusting bolt; Left pedestal and Right socle are connected to form overall base by the 3rd adjusting bolt, and polarity is identical in the horizontal direction for the second permanent magnet and the 3rd permanent magnet; First permanent magnet in the horizontal direction polarity and the second permanent magnet or the 3rd permanent magnet contrary; Second permanent magnet and the 3rd permanent magnet are symmetrical about elastic matrix in the horizontal direction; By adjusting the 3rd adjusting bolt, the right surface that can adjust the first permanent magnet is to the left surface distance d in the horizontal direction of the second permanent magnet or the 3rd permanent magnet; By adjusting the first adjusting bolt and the second adjusting bolt, the centre distance p of the second permanent magnet and the 3rd permanent magnet in the vertical direction can be adjusted; Handle assembly integral installation is on the workplace of vibrator, then the vibration of vibrator is applied to the stiff end of elastic matrix by overall base, thus causes elastic matrix and the vibration of the first permanent magnet on vertical direction and x-axis.
Further, elastic matrix adopts aluminium bomb sheet, copper splinter or titanium alloy shell fragment.
Further, the first permanent magnet, the second permanent magnet and the 3rd permanent magnet are ndfeb magnet, samarium cobalt magnet or ferrite lattice, and magnet shape can be rectangle or cylindrical.
In addition, the invention provides a kind of periodic signal and strengthen detection method, this detection method comprises Signal reception and pre-service, signal are changed, signal strengthens and signals collecting and record four implementation steps:
Step one, to the Noise periodic signal collected, if there is the phenomenon that periodic signal to be detected modulates other radio-frequency components, need first to make demodulation process to signal, then residing for the cycle, scope carries out mutative scale conversion, obtains pretreated signal;
Step 2, by described pretreated signal input power amplifier, inputs vibrator by the signal after amplifying, realizes the conversion of electric signal to mechanical vibration;
Step 3, is arranged on three steady semi-girder physical units above-mentioned on vibrator and strengthens the periodic component in mechanical vibration;
Step 4, gathers and records the input and output signal that above-mentioned signal strengthens pick-up unit.
Further, the demodulation process in described step one adopts envelope demodulation method, and envelope demodulation method adopts Hilbert transform demodulation method, or adopts energy operator demodulation method.
Further, mutative scale conversion in described step one is by selecting a scaling factor X, X is more than or equal to 1, original signal is carried out X and doubly to put soon or X is doubly put slowly, the failure-frequency of original signal is adjusted in the efficient working range of three steady cantilever beam devices.
Advantage of the present invention and good effect are:
(1), compared with prior art, the invention discloses a kind of enhancing pick-up unit and method of periodic signal, a kind of physical unit can be utilized to realize accidental resonance, directly strengthen the periodic component in the Noise signal of input physical unit, performance period, the enhancing of signal detected.This pick-up unit and method have the advantages such as principle is simple, physics realization, Detection results is good, universality is strong.
(2), apparatus of the present invention also have the following advantages: structure is simple, make material easily obtains and low price, easily realizes miniaturization and modularization is improved, to be made and assembling process is simple, be easy to realize batch production etc.The inventive method principle is simple, easy understand, therefore user of service does not need very dark specialty background knowledge; The operating process realizing the method is directly perceived, convenient, and operating personnel do not need the training through specialty to get final product hands-on yet.
Accompanying drawing explanation
Fig. 1 is periodic signal enhancement detection device structural drawing.Number in the figure title: 1-1 is for receiving and pretreatment module, and 1-2 is power amplifier, and 1-3 is vibrator, and 1-4 is three steady semi-girder physical units, and 1-5 is laser displacement sensor, and 1-6 is acceleration transducer, and 1-7 is oscillograph.
Fig. 2 is three steady semi-girder physical unit structural drawing.Number in the figure title: 2-1 is left pedestal, 2-2 be elastic matrix, 2-3 and 2-4 and 2-10 is permanent magnet, 2-5 and 2-8 is permanent magnet seat, 2-7 be Right socle, 2-6 and 2-9 and 2-11 is adjusting bolt.
Fig. 3 is that periodic signal strengthens detection technique implementing procedure figure.
Fig. 4 is that the elastic restoring force that produced by semi-girder when x-axis direction is moved of oscillator and magnet interact the non-linear potential function U(x that the non-linear repulsive force that produces formed jointly).
Fig. 5 is embodiment waveform input signal figure.
Fig. 6 is embodiment signal output waveform figure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described.
From background technology, the existing periodic signal based on Stochastic Resonance Theory strengthens detection technique and mainly realizes accidental resonance based on digital signal processing and analog circuitry system, there is the shortcomings such as implementation process complexity, parameter not easily regulate.
Therefore the invention discloses a kind of periodic signal enhancement detection device and technology, a kind of physical unit can be utilized to realize accidental resonance, directly strengthen the periodic component in the Noise signal of input physical unit, performance period, the enhancing of signal detected, and had the advantages such as principle is simple, physics realization, Detection results is good, universality is strong.
Embodiment one
According to a kind of periodic signal enhancement detection device structural drawing of foregoing invention content and accompanying drawing 1, this device specifically comprises reception and pretreatment module 1-1, power amplifier 1-2, vibrator 1-3, three steady semi-girder physical unit 1-4, laser displacement sensor 1-5, acceleration transducer 1-6, oscillograph 1-7.Signal reception is connected with the input interface of power amplifier 1-2 with the output interface of pretreatment module 1-1; The output interface of power amplifier 1-2 is connected with the input interface of vibrator 1-3; Three steady semi-girder physical unit 1-4 are bolted on the worktable of vibrator 1-3; Laser displacement sensor 1-5 is arranged on suitable support, guarantees that laser beam aims at the semi-girder free vibration end in three steady semi-girder physical unit 1-4; Acceleration transducer 1-6 is bolted on three steady semi-girder physical unit 1-4; The output interface of laser displacement sensor 1-5 and acceleration transducer 1-6 is connected respectively in the different input channel of two of oscillograph 1-7.
Described Signal reception and pretreatment module, comprise signal receiving module, signal receiving processing module, signal change of scale module.
Accompanying drawing 2 is shown in by described three steady semi-girder physical units, comprises left pedestal 2-1, elastic matrix 2-2, permanent magnet 2-3 and 2-4 and 2-10, permanent magnet seat 2-5 and 2-8, Right socle 2-7, adjusting bolt 2-6 and 2-9 and 2-11.Elastic matrix 2-2 can adopt the metal clips such as aluminium, copper or titanium alloy; Permanent magnet 2-3 and 2-4 and 2-10 can be ndfeb magnet, samarium cobalt magnet or ferrite lattice etc., and magnet shape can be rectangle or cylindrical.Wherein elastic matrix 2-2 one end is clamped on left pedestal 2-1 and forms semi-girder; Permanent magnet 2-3 is bonded on the free end of elastic matrix 2-2; Permanent magnet 2-4 and 2-10 is bonded on permanent magnet seat 2-5 and 2-8 respectively; Permanent magnet seat 2-5 and 2-8 is connected on Right socle 2-7 respectively by bolt 2-6 and 2-9; Left pedestal 2-1 and Right socle 2-7 is connected to form overall base by bolt 2-11.Permanent magnet 2-4 with 2-10 in the horizontal direction polarity is identical; Permanent magnet 2-3 in the horizontal direction polarity is contrary with permanent magnet 2-4 or 2-10; Permanent magnet 2-4 and 2-10 is symmetrical about elastic matrix 2-2 in the horizontal direction; By adjustment bolt 2-11, the left surface distance d in the horizontal direction of right surface to permanent magnet 2-4 or 2-10 of permanent magnet 2-3 can be adjusted; By adjustment screw 2-6 and 2-9, the centre distance p of permanent magnet 2-4 and 2-10 in the vertical direction can be adjusted.Handle assembly integral installation is on the workplace of vibrator, then the vibration of vibrator is applied to the stiff end of elastic matrix 2-2 by overall base, thus causes the vibration of elastic matrix 2-2 and permanent magnet 2-3 on vertical direction (x-axis).
Embodiment two
A kind of periodic signal of 3 strengthens detection technique process flow diagram with reference to the accompanying drawings, and the concrete implementation that described a kind of periodic signal strengthens detection method specifically comprises the following steps.
Step one, to the Noise periodic signal collected, if there is the phenomenon that periodic signal to be detected modulates other radio-frequency components, need first to make demodulation process to signal, then residing for the cycle, scope carries out mutative scale conversion, obtains pretreated signal;
Step 2, by described pretreated signal input power amplifier, inputs vibrator by the signal after amplifying, realizes the conversion of electric signal to mechanical vibration;
Step 3, is arranged on the steady semi-girder physical unit of three on vibrator and strengthens the periodic component in mechanical vibration;
Step 4, collection and tracer signal strengthen the input and output signal of pick-up unit.
Demodulation process in described detection method step one adopts envelope demodulation method, and envelope demodulation method can adopt Hilbert transform demodulation method, energy operator demodulation method etc.Mutative scale conversion is by selecting a scaling factor X(X to be more than or equal to 1), original signal is carried out X and doubly to put soon or X is doubly put slowly, the failure-frequency of original signal is adjusted in the efficient working range of three steady cantilever beam devices.Such as, if failure-frequency is greater than the maximum operating range of device, then X is carried out to original signal and doubly put slowly; Otherwise, if failure-frequency is less than the minimum operational range of device, then X is carried out to original signal and doubly puts soon; When failure-frequency is in the working range of device, then play original signal by constant speed (X=1).
Pretreated signal carries out amplifying to drive electromagnetic exciter to vibrate by the power amplifier in described detection method step 2, and this step converts electrical signals to mechanical vibration, strengthens pick-up unit with drive singal.
The accidental resonance enforcement principle of in described detection method step 3 three steady semi-girder physical units is as follows.2 three steady semi-girder physical unit structural drawing with reference to the accompanying drawings, elastic matrix 2-2 and permanent magnet 2-3 as an oscillator, then the vibration of this oscillator under vibration source excitation can regard the non-linear potential function U(x that single-degree-of-freedom object is formed jointly at elastic matrix 2-2, permanent magnet 2-3 and 2-4 and 2-10 as) in forced vibration.U(x when supposing that oscillator is horizontal (elastic matrix 2-2 does not deform))=0, then oscillator is when x-axis direction is moved, non-linear potential function U(x) as shown in Figure 4.As seen from Figure 4 simultaneously, by adjustment distance d and p, can U(x be made) there are three potential wells (lower recess minimum point) and two potential barriers (epirelief place peak), potential well is now called three-stable state potential well, and the vibration of oscillator under the excitation of Noise periodic signal in three-stable state potential well is called three-stable state accidental resonance.Under the driving of input signal, oscillator is at potential function U(x) in motion, if only have weak periodic signal encourage, oscillator can not obtain enough energy to cross potential barrier, therefore can only at potential function U(x) in the middle of potential well near (near x=0) vibrate.And when noise and periodicity feeble signal one work, under the assistance of noise, oscillator can obtain enough energy and cross potential barrier, thus can follow weak periodic signal and realize at U(x) continuous shaking in three potential wells, the movement locus of final oscillator is output signal.This phenomenon is accidental resonance and utilizes noise energy to strengthen the process of periodic signal.To sum up, at non-linear potential function U(x) existence under, weak periodic signal can utilize noise to be enhanced detection.
The input and output signal that signal in described detection method step 4 strengthens pick-up unit adopts oscillograph to carry out gathering and record.The acquisition method of input signal is: degree of will speed up sensor is arranged on the left pedestal 2-1 of device, and the signal obtained measured by acceleration transducer is the vibration of elastic matrix 2-2 stiff end, and this signal is input signal.The acquisition method of output signal is: adopt laser displacement sensor to measure the displacement of elastic matrix 2-2 free end in the vertical direction, and this signal is output signal.
Embodiment three
In order to clearly understand technical scheme of the present invention and effect thereof, be described in detail below in conjunction with a specific embodiment.Build experiment porch according to Fig. 1, the signal for embodiment test is rotating machinery fault simulate signal, and the monolateral decaying pulse that signal was occurred by the cycle and additive white Gaussian noise are added and form, and the frequency of occurrences of down pulse is 8.8Hz.
First, according to Fig. 3 step one, adopt Hilbert transform method to carry out envelope demodulation to fault-signal.Because failure-frequency 8.8Hz is positioned at the efficient working range that signal strengthens pick-up unit, therefore select X=1, namely signal spends broadcasting in tempo.
Subsequently, according to Fig. 3 step 2, by the fault-signal input power amplifier after demodulation, power amplifier output signal drives electromagnetic exciter, and cause the vibration of electromagnetic exciter workplace, this step completes the conversion of electric signal to mechanical vibration.
Then, according to Fig. 3 step 3, be arranged on the steady semi-girder physical unit (Fig. 2) of three on vibrator worktable will follow vibrator and vibrate together, and causing the vibration of the oscillator in the vertical direction be made up of the elastic matrix 2-2 in Fig. 2 and permanent magnet 2-3, this step achieves the enhancing of periodic component in mechanical vibration.
Finally, according to Fig. 3 step 4, the acceleration transducer that the input signal that signal strengthens pick-up unit is installed on left pedestal 1 is measured, and outputs signal and is measured by laser displacement sensor.Input and output signal is simultaneously by oscillograph collection, record and display, and difference as shown in Figure 5 and Figure 6.
The input and output signal of the steady physical unit of comparative analysis below three.Figure 5 shows that the waveform of input signal, can recognize the appearance cycle (being labeled as Td in figure) of periodic pulse signal reluctantly from waveform, but this pulse signal is comparatively faint, comparatively speaking, the noise around pulse is then fairly obvious.The interference of noise may make the identification of recurrence interval become difficulty, and then the accuracy that impact judges equipment failure.Figure 6 shows that the waveform of output signal, as seen from the figure, Noise fault-signal strengthens pick-up unit through signal, and the periodic component in signal is enhanced, in its cycle clear and legible (being labeled as Td in figure), the interference of noise then becomes very faint and even negligible.Known by contrast input and output signal, have benefited from noise in accidental resonance and can strengthen this unique advantage of periodic signal, the noise in input signal can order about signal and strengthen oscillator in pick-up unit at potential function U(x) three stable states between follow recurrent pulse transition continuously; And then from the output signal of reflection movement of pendulum track, the periodic component of Noise periodic signal is enhanced.To sum up, from embodiment, apparatus of the present invention and technology effectively can be carried out enhancing to Noise periodic signal and be detected.
In sum, the invention discloses a kind of periodic signal enhancement detection device and method, be different from existing technical scheme of carrying out periodic signal enhancing detection based on Stochastic Resonance Theory, a kind of physical unit can be utilized to realize accidental resonance, directly strengthen the periodic component in the Noise signal of input physical unit, there is the advantages such as principle is simple, physics realization, Detection results is good, universality is strong.The present invention relates to cycle Detection of Weak Signals field at rotary machinery fault diagnosis etc. to be had and certain should have prospect.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. a periodic signal enhancement detection device, it is characterized in that, this pick-up unit comprises Signal reception and pretreatment module (1), power amplifier (2), vibrator (3), three steady semi-girder physical units (4), laser displacement sensor (5), acceleration transducer (6) and oscillograph (7); Signal reception is connected with the input interface of power amplifier (2) with the output interface of pretreatment module (1); The output interface of power amplifier (2) is connected with the input interface of vibrator (3); Three steady semi-girder physical units (4) are bolted on the worktable of vibrator (3); Laser displacement sensor (5) is arranged on suitable support, guarantees that laser beam aims at the semi-girder free vibration end in three steady semi-girder physical units (4); Acceleration transducer (6) is bolted on three steady semi-girder physical units (4); The output interface of laser displacement sensor (5) and acceleration transducer (6) is connected respectively in the different input channel of two of oscillograph (7); Wherein,
Described Signal reception and pretreatment module, comprise signal receiving module, signal receiving processing module, signal change of scale module;
Described three steady semi-girder physical units, comprise left pedestal (1), elastic matrix (2), the first permanent magnet (3), the second permanent magnet (4), the 3rd permanent magnet (10), the first permanent magnet seat (5), the second permanent magnet seat (8), Right socle (7), the first adjusting bolt (6), the second adjusting bolt (9) and the 3rd adjusting bolt (11); Elastic matrix (2) adopts metal clips; Wherein elastic matrix (2) one end is clamped on left pedestal (1) and forms semi-girder; First permanent magnet (3) is bonded on the free end of elastic matrix (2); Second permanent magnet (4) and the 3rd permanent magnet (10) are bonded on the first permanent magnet seat (5) and the second permanent magnet seat (8) respectively; First permanent magnet seat (5) and the second permanent magnet seat (8) are connected on Right socle (7) respectively by the first adjusting bolt (6) and the second adjusting bolt (9); Left pedestal (1) and Right socle (7) are connected to form overall base by the 3rd adjusting bolt (11), and polarity is identical in the horizontal direction for the second permanent magnet (4) and the 3rd permanent magnet (10); First permanent magnet (3) in the horizontal direction polarity and the second permanent magnet (4) or the 3rd permanent magnet (10) contrary; Second permanent magnet (4) and the 3rd permanent magnet (10) are symmetrical about elastic matrix (2) in the horizontal direction; By adjusting the 3rd adjusting bolt (11), the right surface that can adjust the first permanent magnet (3) is to the left surface distance d in the horizontal direction of the second permanent magnet (4) or the 3rd permanent magnet (10); By adjusting the first adjusting bolt (6) and the second adjusting bolt (9), the centre distance p of the second permanent magnet (4) and the 3rd permanent magnet (10) in the vertical direction can be adjusted; Described three steady semi-girder physical unit integral installations on the workplace of vibrator, then the vibration of vibrator is applied to the stiff end of elastic matrix (2) by overall base, thus causes elastic matrix (2) and the first permanent magnet (3) vibration on vertical direction and x-axis.
2. a kind of periodic signal enhancement detection device according to claim 1, is characterized in that, elastic matrix (2) adopts aluminium bomb sheet, copper splinter or titanium alloy shell fragment.
3. a kind of periodic signal enhancement detection device according to claim 1, it is characterized in that, first permanent magnet (3), the second permanent magnet (4) and the 3rd permanent magnet (10) are ndfeb magnet, samarium cobalt magnet or ferrite lattice, and the first permanent magnet (3), the second permanent magnet (4) and the 3rd permanent magnet (10) shape can be rectangle or cylindrical.
4. periodic signal strengthens a detection method, it is characterized in that, this detection method comprises Signal reception and pre-service, signal are changed, signal strengthens and signals collecting and record four implementation steps:
Step one, to the Noise periodic signal collected, if there is the phenomenon that periodic signal to be detected modulates other radio-frequency components, need first to make demodulation process to signal, then residing for the cycle, scope carries out mutative scale conversion, obtains pretreated signal;
Step 2, by described pretreated signal input power amplifier, inputs vibrator by the signal after amplifying, realizes the conversion of electric signal to mechanical vibration;
Step 3, is arranged on according to claim 1 three steady semi-girder physical units on vibrator and strengthens the periodic component in mechanical vibration;
Step 4, collection and recording rights require the input and output signal of the periodic signal enhancement detection device described in 1.
5. a kind of periodic signal according to claim 4 strengthens detection method, it is characterized in that, the demodulation process in described step one adopts envelope demodulation method, and envelope demodulation method adopts Hilbert transform demodulation method, or adopts energy operator demodulation method.
6. a kind of periodic signal according to claim 4 strengthens detection method, it is characterized in that, mutative scale conversion in described step one is by selecting a scaling factor X, X is more than or equal to 1, original signal is carried out X doubly to put soon or X is doubly put slowly, the failure-frequency of original signal is adjusted in the efficient working range of three steady cantilever beam devices.
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