CN101762368B - Elastomer dynamic response and vibration control test system under time varying load effect - Google Patents
Elastomer dynamic response and vibration control test system under time varying load effect Download PDFInfo
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- CN101762368B CN101762368B CN2009101558103A CN200910155810A CN101762368B CN 101762368 B CN101762368 B CN 101762368B CN 2009101558103 A CN2009101558103 A CN 2009101558103A CN 200910155810 A CN200910155810 A CN 200910155810A CN 101762368 B CN101762368 B CN 101762368B
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Abstract
The invention discloses an elastomer dynamic response and vibration control test system under time varying load effect, which comprises a test bed, a motion generating and controlling device, a piezoelectric sensor, a displacement and speed sensor, a multi-channel charge amplifier, a data collecting device, a display device, a multi-channel piezoelectric ceramic drive power supplier and a piezoelectric actuator; wherein the motion generating and controlling device leads a mass block to move on the cantilever beam of the test bed; the data collecting device collects data of the sensor and sends the data to the display device for displaying by a communication module, and the data collecting device outputs a controlling voltage to the multi-channel piezoelectric ceramic drive power supply after processing the collected data according to an instruction obtained by the display device; the multi-channel piezoelectric ceramic drive power supply controls the voltage for amplifying and applies the voltage to the piezoelectric actuator for suppressing beam vibration. The invention integrates controlling and data collecting into a whole, either the forced vibration or the free vibration can be quickly suppressed and damping effect is obvious.
Description
Technical field
The present invention relates to motion control and vibration experiment, relate in particular to elastomer dynamic response and vibration control test system under the time varying load effect.
Background technology
The analysis of elastomer dynamic response and vibration control is the hot issue of Structural Dynamics with research always under the time varying load effect, influences that the factor of elastomer dynamic response and vibration control comprises load factor, working environment and elastomer structure parameter etc. under the time varying load effect.The excitation that travelling load produces has caused vibration of beam, makes the beam can not steady operation, when the natural frequency of the resonance frequency of excitation and girder construction near the time, parameter resonance can take place, even beam is destroyed, the generation major accident.Therefore, elastomer dynamic response and the vibration control test system technical matters that is necessary is proposed under a kind of time varying load effect.
Summary of the invention
The problem that the present invention solves is that elastomer dynamic response and vibration control test for data are obtained and according to data the elastomeric of semi-girder controlled under the time varying load effect.
For addressing the above problem, elastomer dynamic response and vibration control test system comprise test-bed, motion generation and control device, piezoelectric sensor, displacement and speed pickup, hyperchannel charge amplifier, data acquisition unit, display device, hyperchannel drive power supply for piezoelectric ceramics and piezoelectric actuator under a kind of time varying load effect of the present invention; Test-bed is provided with semi-girder and is positioned at the mass of semi-girder upper surface, and semi-girder one end is a stiff end, and an other end is a free end; The motion generation is connected with described mass with control device and draws mass in the semi-girder upper surface slide; Piezoelectric sensor is pasted on the semi-girder lower surface and is connected with the hyperchannel charge amplifier; Displacement is installed on the test-bed and with data acquisition unit with speed pickup and is connected; Data acquisition unit is connected with the hyperchannel charge amplifier; Display device links to each other with data acquisition unit, is used for display result and obtains instruction; Described piezoelectric actuator is arranged at the lower surface of semi-girder and is connected with described hyperchannel drive power supply for piezoelectric ceramics; Described hyperchannel drive power supply for piezoelectric ceramics is connected with data acquisition unit; Data acquisition unit obtains the data of all the sensors and the data of obtaining is passed to display device by communication module and shows, the instruction that data acquisition unit obtains according to display device is handled back output control voltage to the data of gathering and is given the hyperchannel drive power supply for piezoelectric ceramics, and the hyperchannel drive power supply for piezoelectric ceramics will control voltage and be amplified and be applied on the described piezoelectric actuator and suppress semi-girder and vibrate.
Alternatively, described data acquisition unit comprises data acquisition module, analysis and control module, analog output module and communication module; The analog information of the described all the sensors of data collecting module collected and information passed to is analyzed and control module, analyze with control module this information is carried out behind Fourier transform and the wavelet transformation and corresponding operation result is transferred to display device by communication module showing, analysis outputs signal to analog output module after also handling corresponding data by the instruction of communication module receiving and displaying device with control module, and analog output module is passed to the hyperchannel drive power supply for piezoelectric ceramics with information.
Alternatively, described analog output module comprises digital to analog converter, photoelectricity isolated location, simulation multi-channel switcher, follower amplifier and the output signal terminal strip of cascade successively, described AD conversion unit is connected with control module with analysis, and described output signal terminal strip is connected with the hyperchannel drive power supply for piezoelectric ceramics.
Alternatively, described data acquisition module comprises input signal terminal plate, photoelectricity isolated location, antialiasing filter unit, sample holding unit and the analog quantity/digital quantity converting unit of cascade successively, described input signal terminal plate receives the signal of aforementioned all the sensors, and described analog quantity/digital quantity converting unit is connected with control module with described analysis.
Alternatively, described test-bed also comprises worktable, lower plate, two guide rails and two upper plates; Lower plate is fixed on the worktable, and the middle part of lower plate forms groove, and the groove both sides are boss; The stiff end of described semi-girder is fixed in the groove; Two guide rail opposing parallel are arranged at the sidewall of groove and contact with semi-girder is vertical; The side of described mass contacts with guide rail respectively; Two upper plates are arranged at the upper surface of described boss and guide rail respectively and compress described guide rail, and described displacement and speed pickup are arranged on the upper plate of test-bed.
Alternatively, described worktable, lower plate are bolted to connection with upper plate is in the same place, and described lower plate, upper plate, guide rail and semi-girder link together by bolt and compress guide rail and semi-girder between upper plate and lower plate.
Alternatively, described motion generation and control device comprise servomotor, electric machine controller and programmable power supply, and the output shaft of servomotor is connected with mass by wire wrap terminal, and electric machine controller is connected with programmable power supply with servomotor.
Alternatively, described ACTIVE CONTROL test unit also comprises snubber assembly, and this snubber assembly is arranged at the free end of semi-girder, and snubber assembly is provided with the silicon rubber cushion pad, and the upper surface of silicon rubber cushion pad is concordant with the upper surface of semi-girder.
Alternatively, described vibration control test system also comprises current vortex sensor, and this current vortex sensor is arranged at the free end of semi-girder and is connected with data acquisition unit.
Compared with prior art, the present invention has the following advantages:
1, the present invention includes piezoelectric sensor, acceleration transducer, displacement and speed pickup and piezoelectric actuator, therefore, can utilize displacement and speed pickup detection effect time-varying load feature in semi-girder, utilize piezoelectric sensor, acceleration transducer, current vortex sensor detects the strain-responsive of elastomer structure under time-varying load, acceleration responsive and displacement response, the signal of described sensor is carried out obtaining the dynamic perfromance that semi-girder vibrates behind Fourier transform and the wavelet transformation, and according to dynamic perfromance by display device give data acquisition unit instruction produces control voltage and and will control voltage by the hyperchannel drive power supply for piezoelectric ceramics and be amplified and be applied to and suppress semi-girder on the described piezoelectric actuator and vibrate, this vibration control experiment system integrates vibration test and ACTIVE CONTROL, it is accurate to obtain data, opinion is forced vibration, still free vibration, all can be suppressed fast, effectiveness in vibration suppression is obvious.
2, the wire wrap terminal of the output shaft of servomotor is connected the rectilinear motion that the rotation of output shaft can be converted into mass with described mass, comprises uniform motion and variable motion, is convenient to the forms of motion of control of quality piece.
3, detect the semi-girder free end travel by current vortex sensor, obtain the amplitude size of semi-girder transverse vibration and the deformation information of semi-girder, improve the vibration information precision that vibration active control system detects, shorten the response time, improve the technical merit of Active Vibration Control.
4, described test unit comprises snubber assembly, and this snubber assembly can stop mass to break away from semi-girder because inertia moves.
Description of drawings
Fig. 1 is the structural representation of elastomer dynamic response and vibration control test system under the time varying load effect of the present invention;
Fig. 2 is the structural representation of the test-bed of elastomer dynamic response and vibration control test system under the time varying load effect of the present invention;
The structural representation of the data acquisition unit of elastomer dynamic response and vibration control test system under Fig. 3 time varying load effect of the present invention.
Embodiment
See also Fig. 1, elastomer dynamic response and vibration control test system comprise that test-bed 1, motion take place and control device 2, piezoelectric sensor 3, acceleration transducer 4, displacement and speed pickup 5, hyperchannel charge amplifier 6, data acquisition unit 7 and display device 8, hyperchannel drive power supply for piezoelectric ceramics 101 and piezoelectric actuator 102 under a kind of time varying load effect of the present invention.
See also Fig. 2, described stand 1 comprises worktable 11, lower plate 12, semi-girder 13, two guide rails 14, two upper plates 15, mass 16, first bolt 17 and second bolts 18.
The both sides of worktable 11 are respectively arranged with first screw.
Semi-girder 13 1 ends are stiff end, and an other end is a free end.The stiff end of semi-girder 13 offers four screw corresponding with second screw.The upper surface of semi-girder 13 is a working surface.
Offer five screw corresponding with second screw on two guide rails 14 respectively, guide rail 14 mainly play the guiding role in the present embodiment, guarantees the motion state of mass 16.
The two ends of each piece upper plate 15 offer six screw corresponding with first screw and seven screw corresponding with second screw respectively.
Test-bed 1 links together in the following way:
See also Fig. 1, motion takes place and control device 2 comprises servomotor 21, electric machine controller 22, programmable power supply 23.The output shaft of described servomotor 21 is connected with mass 16 by wire wrap terminal.Servomotor 21 is connected with electric machine controller 22.Programmable power supply 23 is programmable power supplys.
See also Fig. 1, piezoelectric sensor 3 is installed in the lower surface of semi-girder 13.In the present embodiment, piezoelectric sensor 3 is by pasting the lower surface that glue sticks on semi-girder 13, and this bonding glue is synthetic by three kinds of chemical substances, and its composition and ratio are as follows: (weight ratio) epoxy: thinning agent: hardening agent=100: 10: 25～30.
See also Fig. 1, acceleration transducer 4 is installed in semi-girder 13 free-ended lower surfaces and is connected with hyperchannel charge amplifier 6, and concrete, acceleration transducer 4 is fixed in semi-girder 13 free end lower surfaces by glue or nut.
See also Fig. 1, displacement and speed pickup 5 are installed in by support on the upper plate 15 of test-bed 1 and with mass 16 and are connected with data acquisition unit 7, for the speed and the displacement of measuring travelling load, displacement and speed pickup 5 are connected in the moving mass piece by the permanent electric magnet of sensor, and displacement and speed pickup 5 are arranged on the axial plane of semi-girder.Displacement and speed pickup 5 are the sensor of an integrated form, and it is the displacement and the speed of detected object simultaneously.
See also Fig. 1, hyperchannel charge amplifier 6 is connected with acceleration transducer 4 with described piezoelectric sensor 3, and hyperchannel charge amplifier 6 is separate unit instruments.
See also Fig. 3, described data acquisition unit 7 comprises data acquisition module 71, analysis and control module 72, communication module 73 and analog output module 74.
Described data acquisition module 71 comprises input signal terminal plate 711, photoelectricity isolated location 712, antialiasing filter unit 713, sample holding unit 714 and the analog quantity/digital quantity converting unit 715 of cascade successively.Described input signal terminal plate 711 receives the signal of hyperchannel charge amplifier 6 and displacement and speed pickup 5.It specifically is to analyze to be connected with described analog quantity/digital quantity converting unit 715 with control module 72 that described data acquisition module 71 is connected with control module 72 with analysis.
See also Fig. 1, the process of the test of elastomer dynamic response and vibration control test system is as follows under the time varying load effect of the present invention:
Start programmable power supply 23, programmable power supply 23 output voltages are given electric machine controller 22, electric machine controller 22 makes servomotor 21 rotate, because mass 16 is to be connected with servomotor 21 by wire wrap terminal, therefore, rotatablely moving of servomotor 21 is converted into the rectilinear motion of mass 16 on semi-girder 13.Because programmable power supply 23 is programmable, therefore, by program setting, the different voltage of programmable power supply 23 outputs makes servomotor 21 have different rotating speeds, thereby mass 16 has multiple forms of motion (comprising uniform motion and variable motion) on semi-girder 13.Mass 16 moves on semi-girder 13 and strain signal, the acceleration signal of the semi-girder 13 that triggers and travelling load displacement signal and the rate signal that acts on the semi-girder can obtain by piezoelectric sensor, acceleration transducer and displacement and speed pickup respectively accordingly.These sensors obtain the process of signal, and respectively details are as follows:
1, obtaining of piezoelectric signal: semi-girder 13 produces transverse vibration under moving mass piece 16 incentive actions, causes microstrain to produce, and the piezoelectric sensor 3 that is pasted on semi-girder 13 is responded to corresponding electric charge based on the piezoelectricity positive-effect; Then charge information is passed to hyperchannel charge amplifier 6, transfer to photoelectricity isolated location 712 after being transferred to the input signal terminal plate 711 of data acquisition module 71 after hyperchannel charge amplifier 6 amplifies charge information, photoelectricity isolated location 712 can have good electrical isolation capabilities and antijamming capability with isolating mutually between input and output; Then, transfer to antialiasing filter unit 713, antialiasing filter unit 713 guarantees that the signal of sampling is undistorted; Then, transfer to sample holding unit 714, sample holding unit 714 continually varying analog vibration conversion of signals in time is time dependent pulse signal; Enter analysis and control module 72 after transferring to analog quantity/digital quantity converting unit 715 at last.
2, obtaining of acceleration signal: acceleration transducer 4 is used to measure the forced vibration of semi-girder free end and the acceleration change in free vibration stage under the movable mass function.Acceleration signal during semi-girder 13 transverse vibration is by the piezoelectricity positive-effect, be converted into the corresponding charge amount, and this charge signal is converted to voltage signal by the hyperchannel charge amplifier 6 that is connected in acceleration transducer 4, transfer to through input signal terminal plate 711, photoelectricity isolated location 712, antialiasing filter unit 713, sample holding unit 714 and the analog quantity/digital quantity converting unit 715 of data acquisition module 71 and analyze and control module 72.Input signal terminal plate 711, photoelectricity isolated location 712, antialiasing filter unit 713, sample holding unit 714 and analog quantity/digital quantity converting unit 715 how narrated when handling the signal of piezoelectric sensor 3 by processing signals, do not repeat them here.
3, obtaining of displacement and rate signal: displacement and speed pickup 5 adopt MTS Tempo SonicsRPV0750 type sensor, this sensor utilizes the magnetostrictive effect of sensor material, adopt the noncontact mode to detect movable magnet displacement and the speed that is synchronized with the movement with the moving mass piece, because magnet there is no direct contacting with sensor, therefore sensor can use under most evil bad industrial environment, causes loss never.This sensor can be exported displacement and rate signal simultaneously.The signal that displacement and speed pickup 5 obtain also transfers to through input signal terminal plate 711, photoelectricity isolated location 712, antialiasing filter unit 713, sample holding unit 714 and analog quantity/digital quantity converting unit 715 and analyzes and control module 72.
After analysis is obtained the information of above-mentioned piezoelectric sensor 3, acceleration transducer 4 and displacement and speed pickup 5 with control module 72, show behind above-mentioned information employing Fourier transform and the wavelet transformation result being passed to display device 8 by communication module 73.Analyze with 72 pairs of signals that obtained of control module and carry out Fourier's variation and wavelet transformation, such as, obtain the transient response of semi-girder free end under movable mass function by acceleration transducer 4, it is carried out spectrum analysis and wavelet transformation, can obtain the shared ratio of each rank mode in the cantilever beam dynamic response under the travelling load excitation, thereby, get access to the mode of dynamic perfromance, can obtain the natural frequency of semi-girder by acceleration signal, obtain damping by displacement, acceleration or strain-responsive curve calculation.
Analyze with control module 72 and obtain acceleration transducer, displacement and speed pickup, after the information that piezoelectric sensor obtains, beam forced vibration and free vibration are responded the model analysis that experimentizes, obtain the beam vibration feature, simultaneously, the vibration performance that obtains is passed to computing machine 103 by communication module 73 to be shown, then, according to this vibration characteristics, receive instruction and instruction is passed to analysis and control module 72 by computing machine 103, analyze with control module 72 and instruct displacement signal according to this, the strain signal of acceleration signal and piezoelectric sensor induction carries out data fusion, and fusion results combined with concrete control strategy, the optimizing application algorithm is found the solution the parameter that vibration experiment obtains, and control based on PID, Adaptive Fuzzy Control or offset methods such as control, pass through analog output module 74 to drive power supply for piezoelectric ceramics 101 output control voltages through calculating the back in real time, amplified by 101 pairs of control of drive power supply for piezoelectric ceramics voltage, outputting drive voltage acts on piezoelectric actuator 102, piezoelectric actuator 102 produces inverse piezoelectric effect under the driving voltage effect, output controllable force or moment loading are realized the ACTIVE CONTROL to beam vibration in semi-girder.
See also Fig. 1, described semi-girder vibration control test system comprises current vortex sensor 9, the semi-girder free end travel that current vortex sensor 9 is used to measure under the movable mass function changes, current vortex sensor 9 is the non-contact testing instrument, the position got final product above current vortex sensor was fixed in semi-girder 13 free ends by unit clamp during measurement, when semi-girder vibrated, current vortex sensor 9 can the inductive displacement signal.This current vortex sensor 9 is arranged at the free end of semi-girder 13 and is connected with the input signal terminal plate 711 of data acquisition unit 71, the signal that current vortex sensor 9 is gathered is analyzed and control module 72 by transferring to after described input signal terminal plate 711, photoelectricity isolated location 712, antialiasing filter unit 713, sample holding unit 714, the analog quantity/digital quantity converting unit 715 realization analog to digital conversion successively, analyzes the signal that obtains with 72 pairs of current vortex sensors 9 of control module and carries out transferring to display device 8 demonstrations by communication module 73 behind wavelet transformation and the welfare leaf transformation.By detecting semi-girder 13 free end travels, obtain the deformation information of semi-girder, and compare with the free end acceleration vibration signal of semi-girder 13, eliminate the high-frequency interferencing signal that noise and acceleration transducer 4 pick up, to improve the vibration information precision that vibration active control system detects, reduce the signal analysis time, improve the technical merit of Active Vibration Control.
See also Fig. 1, the present invention also comprises snubber assembly 10, and this snubber assembly 10 is arranged at the free end of semi-girder 13, and snubber assembly 10 is provided with the silicon rubber cushion pad, and the upper surface of silicon rubber cushion pad is concordant with the upper surface of semi-girder 13.This snubber assembly is used to stop mass 16 to break away from semi-girder 13 because inertia moves.
In sum, elastomer dynamic response and vibration control test system pass through piezoelectric sensor under the time varying load effect of the present invention, acceleration transducer and displacement and speed pickup obtain the vibration information of semi-girder, carry out Fourier transform and wavelet transformation by this information then, thereby, obtain the dynamic perfromance of semi-girder under the travelling load effect, be to realize the beam vibration dynamic response multianalysis of moving mass excitation, be convenient to the structural design personnel and analyze qualitatively and understand travelling load moving-mass and movement velocity parameter and change development trend beam vibration response influence.Then according to dynamic perfromance, send instruction by computing machine to data acquisition unit 7 and give hyperchannel drive power supply for piezoelectric ceramics 101, hyperchannel drive power supply for piezoelectric ceramics 101 output voltages are given piezoelectric actuator 102, piezoelectric actuator 102 gives semi-girder 13 acting forces and suppresses the vibration of semi-girder 13, no matter be forced vibration, still free vibration all can be suppressed fast, and effectiveness in vibration suppression is obvious.
Though the present invention with preferred embodiment openly as above; but it is not to be used for limiting claim; any those skilled in the art without departing from the spirit and scope of the present invention; can make possible change and modification, so protection scope of the present invention should be as the criterion with the scope that the utility model claim is defined.
Claims (8)
1. elastomer dynamic response and vibration control test system under the time varying load effect comprise: test-bed, motion generation and control device, acceleration transducer, current vortex sensor, piezoelectric sensor, displacement and speed pickup, hyperchannel charge amplifier, data acquisition unit, display device, hyperchannel drive power supply for piezoelectric ceramics and piezoelectric actuator;
Test-bed is provided with semi-girder and is positioned at the mass of semi-girder upper surface, and semi-girder one end is a stiff end, and an other end is a free end;
The motion generation is connected with described mass with control device and draws mass in the semi-girder upper surface slide;
Acceleration transducer is fixed in semi-girder free end lower surface, and is connected with the hyperchannel charge amplifier;
Current vortex sensor is arranged at the free end of semi-girder and is connected with data acquisition unit;
Piezoelectric sensor is pasted on the semi-girder lower surface and is connected with the hyperchannel charge amplifier;
Displacement is installed on the test-bed and with data acquisition unit with speed pickup and is connected;
Data acquisition unit is connected with the hyperchannel charge amplifier;
Display device links to each other with data acquisition unit, is used for display result and obtains instruction;
Described piezoelectric actuator is arranged at the lower surface of semi-girder and is connected with described hyperchannel drive power supply for piezoelectric ceramics;
Described hyperchannel drive power supply for piezoelectric ceramics is connected with data acquisition unit;
Data acquisition unit obtains the data of all the sensors and the data of obtaining is passed to display device by communication module and shows, the instruction that data acquisition unit obtains according to display device is handled back output control voltage to the data of gathering and is given the hyperchannel drive power supply for piezoelectric ceramics, and the hyperchannel drive power supply for piezoelectric ceramics will control voltage and be amplified and be applied on the described piezoelectric actuator and suppress semi-girder and vibrate.
2. elastomer dynamic response and vibration control test system under the time varying load effect as claimed in claim 1 is characterized in that described data acquisition unit comprises data acquisition module, analysis and control module, analog output module and communication module; The analog information of the described all the sensors of data collecting module collected and information passed to is analyzed and control module, analyze with control module this information is carried out behind Fourier transform and the wavelet transformation and corresponding operation result is transferred to display device by communication module showing, analysis outputs signal to analog output module after also handling corresponding data by the instruction of communication module receiving and displaying device with control module, and analog output module is passed to the hyperchannel drive power supply for piezoelectric ceramics with information.
3. elastomer dynamic response and vibration control test system under the time varying load effect as claimed in claim 2, it is characterized in that, described analog output module comprises digital to analog converter, photoelectricity isolated location, simulation multi-channel switcher, follower amplifier and the output signal terminal strip of cascade successively, described data acquisition module is connected with control module with analysis, and described output signal terminal strip is connected with the hyperchannel drive power supply for piezoelectric ceramics.
4. elastomer dynamic response and vibration control test system under the time varying load effect as claimed in claim 2, it is characterized in that, described data acquisition module comprises input signal terminal plate, photoelectricity isolated location, antialiasing filter unit, sample holding unit and the analog quantity/digital quantity converting unit of cascade successively, described input signal terminal plate receives the signal of aforementioned all the sensors, and described analog quantity/digital quantity converting unit is connected with control module with described analysis.
5. elastomer dynamic response and vibration control test system under the time varying load effect as claimed in claim 1 is characterized in that, described test-bed also comprises worktable, lower plate, two guide rails and two upper plates; Lower plate is fixed on the worktable, and the middle part of lower plate forms groove, and the groove both sides are boss; The stiff end of described semi-girder is fixed in the groove; Two guide rail opposing parallel are arranged at the sidewall of groove and contact with semi-girder is vertical; The side of described mass contacts with guide rail respectively; Two upper plates are arranged at the upper surface of described boss and guide rail respectively and compress described guide rail, and described displacement and speed pickup are arranged on the upper plate of test-bed.
6. elastomer dynamic response and vibration control test system under the time varying load effect as claimed in claim 5, it is characterized in that, described worktable, lower plate and upper plate link together by second bolt, and described lower plate, upper plate, guide rail and semi-girder link together by first bolt and compress guide rail and semi-girder between upper plate and lower plate.
7. elastomer dynamic response and vibration control test system under the time varying load effect as claimed in claim 1, it is characterized in that, described motion generation and control device comprise servomotor, electric machine controller and programmable power supply, the output shaft of servomotor is connected with mass by wire wrap terminal, and electric machine controller is connected with programmable power supply with servomotor.
8. elastomer dynamic response and vibration control test system under the time varying load effect as claimed in claim 1, it is characterized in that, elastomer dynamic response and vibration control test system also comprise snubber assembly under the described time varying load effect, this snubber assembly is arranged at the free end of semi-girder, snubber assembly is provided with the silicon rubber cushion pad, and the upper surface of silicon rubber cushion pad is concordant with the upper surface of semi-girder.
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