CN103335854A - Rubber shock absorber measurement and control system based on acceleration feedback information drive - Google Patents

Abstract

A rubber shock absorber measurement and control system based on the acceleration feedback information drive, which comprises a rubber shock absorber passive vibration isolation main mechanical device, sensors, an electro-hydraulic driving system, a D/A conversion and signal amplifier, a signal regulating circuit, a multifunctional collecting card, a main control computer, and a dynamic performance measurement and control software, wherein the vehicle rubber shock absorber passive vibration isolation main mechanical device is connected with the sensors and the electro-hydraulic driving system respectively; the electro-hydraulic driving system is connected with the D/A conversion and signal amplifier; the sensors are connected with the signal regulating circuit; the signal regulating circuit is connected with the multifunctional data collecting card; the multifunctional data collecting card and the D/A conversion and signal amplifier are connected with the main control computer respectively. According to the invention, the multiple parameter dynamic performance testing research of the shock absorber is performed according to specific working condition environment to obtain the dynamic characteristics and the relation analysis of the dynamic characteristics, so that the rubber shock absorber can be tested, analyzed and optimally designed more reasonably.

Description

Rubber shock absorber TT﹠C system based on the driving of acceleration feedback information

[technical field]

The present invention relates to a kind of TT﹠C system, be specifically related to a kind of rubber shock absorber TT﹠C system that drives based on the acceleration feedback information.

[background technology]

In Vehicular system, the vibration source that comes from orientation such as power source, ground and equipment is more, and some vibration has characteristics such as the big and wide frequency range of the power width of cloth, and Vehicular system is caused multiple harm.Te Do is vehicle because of the generation of phenomenons such as resonance, inferior humorous resonance and ultraharmonic resonance, can produce more severe noise.The vibration problem under the various engineering machinery work condition environments for example.Its vibration control problem not only has influence on man-machine working environment, also will influence the selling market of enterprise product.

In order to be implemented in the Vehicular vibration control under the dynamic environment, for a long time, carry out a large amount of R﹠D works, formed some than proven technique, as linear mode experiment technology, the experiment test of the linear-static of some damped products and partial dynamic performance etc.On the vehicle a plurality of vibration dampers are just arranged, often the vibration damper product that uses mainly contains metal spring, metal-rubber complex spring, air spring, oil damper and rubber shock absorber, and electromagnetism rheology vibration damper, metal-rubber vibration damper etc.And rubber shock absorber is as a kind of better quality products at good values, and it has advantages such as multi-direction vibration damping, manufacturing process be simple, easy for installation, is widely used in Vehicle Engineering.But its working environment is complicated dynamic operation condition, the codes and standards of most of vibration dampers but have only static state or quasistatic design parameter, relationship analysis to the dynamic parameter system of vibration damper lacks especially, and this makes its application to carry out the experience design according to the in addition reasoning of static design parameter.Can avoid using this design when therefore, vehicle designs at home as far as possible.The engineering dynamic design of utilizing the dynamic parameter system of vibration damper to carry out physical construction, Vehicle Engineering system etc. product is that manufacturing enterprise obtains independent intellectual property right, the inevitable demand of developing industry excellent in design product.

Test specialized equipment to rubber shock absorber generally also has only static state or quasistatic equipment at present, can not carry out dynamic multiparameter system test and dynamic data relationship analysis to vibration damper rapidly and accurately, can not provide the design rubber shock absorber necessary multiple design reference.And for the rubber vehicle vibration damper in process of production, because the vibration isolation rubber macromolecular material is in the preparation process of complexity such as prescription, calendering process and high temperature vulcanized moulding process, can cause the uncertainty of its performance to change, often after formed product, need to determine rapidly and accurately by experiment its multiple performance parameter, particularly will determine its dynamic property according to concrete work condition environment, be the prerequisite condition that realizes its optimal design and application.The exploitation of this dynamic experiment equipment is the prerequisite that realizes accurate vibration control.

In view of this, the inventor furthers investigate at the defective of prior art, and has this case to produce.

[summary of the invention]

Technical matters to be solved by this invention is to provide a kind of rubber shock absorber TT﹠C system that drives based on the acceleration feedback information, carry out the dynamic property experimental study of vibration damper multiparameter according to concrete work condition environment, obtain dynamic perfromance and relationship analysis thereof, to realize more tests reasonableness, analysis and the optimal design of rubber shock absorber.

The present invention solves the problems of the technologies described above by the following technical solutions:

Rubber shock absorber TT﹠C system based on the acceleration feedback information drives comprises rubber shock absorber passive vibration isolation main body mechanical hook-up, sensor, electric liquid drive system, D/A conversion and signal amplifier, signal conditioning circuit, multi-function data acquisition card, main control computer, dynamic property TT﹠C software;

Described rubber vehicle vibration damper passive vibration isolation main body mechanical hook-up connects described sensor, described electric liquid drive system respectively; Described electric liquid drive system connects described D/A conversion and signal amplifier; Described sensor connects described signal conditioning circuit; Described signal conditioning circuit connects described multifunctional data acquisition card; Described multifunctional data acquisition card and described D/A conversion and signal amplifier are connected respectively to described main control computer;

Described sensor comprises displacement transducer, acceleration transducer, power sensor;

Described main control computer design has described dynamic property TT﹠C software, the data readback that this software is gathered signal by the accelerating curve, displacement curve and force curve three tunnel simulating signals that obtain from described data collecting card collection, fundamental frequency is analyzed, data filtering, power spectrumanalysis, correlation analysis, damping characteristic is analyzed, and shows the merit specificity analysis, and extract quantity of state from test signal, be used for the comparison operation of electrohydraulic servo-controlling system, realize the control that shaking platform drives based on acceleration.

Described dynamic property TT﹠C software comprises main interface module, data acquisition module, data analysis module; Data sheet output and display module;

Described main interface module: adopted basic design principles of man-machine interface during this modular design, the interactive interface that is used for this project test is directly perceived, succinct, attractive in appearance, suitable, easy to operate.Be used for connecting tasks such as data acquisition module, data analysis module and data sheet print module.The panel designs of this virtual instrument module the relevant user's master menu of test and use the panel knob, the user can be convenient to use handle instrument work.

Described data acquisition module: be used for analog quantity and switching value that the collecting device upper sensor measures, mainly comprise and gather acceleration signal, force signal and displacement signal etc., and in this test platform, make oscillograph, have the real-time Presentation Function of signal, and data complete preservation is in time got up.

Described data analysis module: the related data waveform that will gather signal shows, and it is carried out filtering handle.Data in the saving file are carried out dynamic signal analysis, comprise power spectrum, autocorrelation analysis, cross-correlation analysis etc., to obtain signal frequency-domain and time domain specification.

Described data sheet output and display module: the information that obtains after being used for analyzing is carried out form or form demonstration, printing and output function.The report display of this module mainly shows pumping signal, original frequency signal, stops frequency signal, acquisition time demonstration etc., and form shows the main form data such as pumping signal, displacement amplitude, acceleration amplitude, acquisition time that show.

The invention has the advantages that: 1, designed charger and the one-piece construction of this TT﹠C system, and designed and processed the frock clamp of this equipment.This TT﹠C system has adopted based on acceleration information controls comparison signal as close-loop feedback, and design characteristic is to finish the more TT﹠C task of broadband test scope like this.2, realized that rubber shock absorber is sinusoidal and axially loaded, loaded by electrohydraulic servo system, and can realize multiple load test stabilization such as random test spectrum loading by equilibrium treatment.Cooperate testing apparatus electronics software and hardware system, can realize the higher test assignment of difficulty of test under the dynamic environment.3, more intactly research and analysis the dynamic property of tested object form and test data between dynamic relationship and displaying scheme, carried out various dynamic relationship analyses, selected the test system hardware formation, analyzed principle of work and the testing process of system.4, designed dynamic performance testing software, software development is the core of this virtual test system, the software systems of testing apparatus have been write, write the software program of test analysis after-treatment system, realized the design object of the software section of rubber shock absorber mechanics static and dynamic performance parameter system testing apparatus.5, adopt waveform input debugging software, and carry out the on-the-spot test operation, operation result shows that this virtual test system is feasible.

[description of drawings]

The invention will be further described in conjunction with the embodiments with reference to the accompanying drawings.

Fig. 1 is system hardware composition frame chart of the present invention.

Fig. 2 is rubber shock absorber passive vibration isolation main body mechanical device structure block diagram among the present invention.

Fig. 3 is software general plan project organization block diagram among the present invention.

Fig. 4 is program overall work process design drawing among the present invention.

Fig. 5 is data analysis process flow diagram among the present invention.

Fig. 6 mainly uses the cross correlation function analysis chart in the system among the present invention.

Fig. 7 is the power spectrumanalysis figure of signal among the present invention.

Fig. 8 is damping characteristic figure among the present invention.

Fig. 9 is the information synoptic diagram in the data sheet module among the present invention.

Figure 10 is data analysis guidance panel and the main interfacial effect figure of operation among the present invention.

Figure 11 is waveform display part figure among the present invention.

Figure 12 is the data acquisition panel figure among the present invention.

[embodiment]

Rubber shock absorber dynamic property TT﹠C system based on acceleration information comprises hardware design and software design.Hardware design mainly comprises rubber vehicle vibration damper passive vibration isolation main body mechanical hook-up, sensor, electric liquid drive system, D/A conversion and signal amplifier, signal conditioning circuit, multi-function data acquisition card, main control computer as shown in Figure 1.

Described rubber vehicle vibration damper passive vibration isolation main body mechanical hook-up connects described sensor, described electric liquid drive system respectively; Described electric liquid drive system connects described D/A conversion and signal amplifier; Described sensor connects described signal conditioning circuit; Described signal conditioning circuit connects described multifunctional data acquisition card; Described multifunctional data acquisition card and described D/A conversion and signal amplifier are connected respectively to described main control computer;

Described sensor comprises displacement transducer, acceleration transducer, power sensor.

Test process is at first testing acceleration, displacement and force signal, and these signals are the light current simulating signals that obtain from sensor measurement, needs to change through signal amplifier and analog to digital converter to transfer digital signal to.Data acquisition and the analytical applications software of recycling Labview establishment by multifunctional data acquisition card, are directly gathered and aftertreatment experimental data on computers.Then be that result by data analysis adjusts control signal to the control of the electrohydraulic servo valve of electrohydraulic servo-controlling system.Steering order is converted into simulating signal by digital to analog converter and signal conditioner, as the anti-routed signal of electrohydraulic servo-controlling system, is used for realizing the comparison information of closed-loop control, iterates processing through equilibrium again, realizes controlling target.

Rubber shock absorber passive vibration isolation main body mechanical hook-up as shown in Figure 2, its principle of work is that test block utilizes upper and lower frock clamp clamping on testing table main frame shaking table, electrohydraulic servo valve control hydraulic cylinder is as vibrator, be installed in below the main frame shaking platform, and interconnect with the main frame shaking platform.Computer control system is by acceleration and the displacement of control electrohydraulic servo valve control hydraulic cylinder.

The type selecting of the part key equipment of this computer measurement and control system is done simple the introduction.

Displacement transducer adopts hydraulic cylinder external mounting means, is used for measuring displacement size and the direction of piston cylinder.Because shaking platform and anchor clamps all have the big feature of rigidity, therefore the displacement of test is exactly the displacement of vibration damper, and this displacement transducer has been selected WYW-20D type differential transformer displace for use.This sensor has the measuring accuracy height, and the linearity is good, tests displacement greatly and the characteristics of stable performance, obtains using more widely at measurement and control area.

Acceleration transducer has adopted the metal pull pressure sensor, and the pressure-bearing range of this pressure transducer can reach 30KN, can bear pressure, also can carry out tension measurement simultaneously.Before measurement, all to need to demarcate processing, to demarcate accurately in order making, preferably carry out on-site proving before the test.And acceleration sensor has been selected Y-YD-7044 type piezoelectric pressure indicator for use.This acceleration sensor has higher sensitivity, is specially adapted to measure the acceleration test under the low frequency dynamic environment.

Data collecting card has been selected the multi-functional DAQ integrated circuit board of the PCI-6251 of NI company for use.

Describe software section below in detail:

The software design of computer measurement and control system is the most critical part of equipment set design, and reasonably the software design will have rational software general plan, and the general plan design of this software mainly comprises following module: the data acquisition module design; The data analysis module design; The data sheet modular design.Each part contains branch's module again.The exploitation of this application software is based on graphical programming language Labview and designs, this language is that American National instrument company is through design and use for many years, proved that programming language Labview is convenient to use, compatible strong, stable and reliable for performance, the measuring accuracy height, and have the multiple advantage of high-level programming language, especially be fit to carry out the applied software development of rubber vehicle vibration damper TT﹠C system.

This complete equipment is because the PCI-6251 integrated circuit board that has adopted NI company to produce carries out data acquisition, so be more suitable for adopting programming language Labview to design, the testing software of this cover TT﹠C system has designed multiple oscillograph, has the good man-machine interaction interface, the hierarchical structure of optimizing, the more comprehensively mechanical behavior of rubber vehicle vibration damper and test analysis and the Presentation Function of characteristic.The starting point of design begins to carry out from accelerating curve, displacement curve and force curve three tunnel simulating signals that the data collecting card collection obtains, gather the data readback of signal, fundamental frequency is analyzed, data filtering, power spectrumanalysis, correlation analysis, analysis functions such as merit specificity analysis are shown in the damping characteristic analysis.And from test signal, extract the acceleration condition amount, be used for the comparison operation of electrohydraulic servo-controlling system, with the control strategy of realizing that shaking platform drives based on acceleration.This cover software general plan project organization block diagram as shown in Figure 3.

Program operation at first should be carried out the initialization of correlation parameter, mainly comprises the initial setting up of data collecting card, the amplitude setting of pumping signal, the setting of the frequency initial value of the phase place of pumping signal and pumping signal, the arranging etc. of filter filtering scope.Program overall work flow scheme design as shown in Figure 4.

Data analysis module: at first read output signal is also therefrom isolated four road signals from wave file, comprises displacement signal, acceleration signal, the signal relevant with damping.Displacement signal, acceleration signal, force signal shows through the laggard row of filtering and analyzes that the data analysis process flow diagram is seen Fig. 5.

This TT﹠C system adopts the arithmetic mean wave filter to carry out test signal filtering, and its computing formula is shown in expression formula (1):

$y\left(k\right)=\frac{1}{N}\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}x(k-i)---\left(1\right)$

If establish x (t) and be a record sample of certain ergodic process, x (t+ τ) is the sample behind x (t) the time shift τ.The autocorrelation function of x (t) such as expression formula (2):

$R_x=\underset{T\→\∞}{\lim }\left(\frac{1}{2T}\right){\∫}_{-T}^{T}x\left(t\right)x(t+\mathrm{\τ})\mathrm{dt}---\left(2\right)$

One of the autocorrelation function of design is used for checking whether contain periodic component in the signal.X (t) is random signal, and is when time shift τ is very big, irrelevant each other between x (t) and the x (t+ τ).Periodic component is arranged in the signal, and its autocorrelation function is all unattenuated when τ is very big, and has obvious periodic.The random signal autocorrelation function when τ is big slightly that does not contain periodic component just levels off to zero.In native system, use autocorrelation analysis displacement, acceleration, damping force signal, with the periodic component in the picked up signal.

If the cross correlation function R of two random signal x (t) and y (t) _Xy(τ) be defined as expression formula (3):

$R_{\mathrm{xy}}\left(\mathrm{\τ}\right)=\underset{x\→\∞}{\lim }\left(\frac{1}{2T}\right){\∫}_{-T}^{T}x\left(t\right)y(t+\mathrm{\τ})\mathrm{dt}---\left(3\right)$

Cross correlation function is used for extracting very effective means of useful information under noise background.If to certain linear system exciting, usually contain a large amount of noise in the so resulting vibration signal.According to the frequency retention performance of linear system, having only the composition identical with excited frequency just may be the response that causes owing to exciting, and other compositions all are to disturb.In the native system mainly with cross correlation function analysis such as Fig. 6, displacement excitation signal and the cross correlation function analysis of gathering signal.

If the related function of stationary random signal x (t) is R _x(τ), and R _x(τ → ∞)=0, then the autopower spectral density functional expression (4) of this signal is

$S_x\left(f\right)={\∫}_{-\∞}^{\∞}{R}_x\left(\mathrm{\τ}\right)e^{-j2\mathrm{\πf\τ}}\mathrm{d\τ}---\left(4\right)$

The power spectrumanalysis of signal such as Fig. 7 have shown the energy loss of rubber shock absorber and the combination property of energy storage.Damping characteristic figure such as Fig. 8, reflection be nonlinear characteristic and the lagging characteristics of rubber vehicle vibration damper.

The data sheet module: essential record the information of the frequency of signal, amplitude and first phase, the start time of collection and concluding time, information such as Fig. 9 such as frequency control system.User interface mainly comprises three major parts: waveform display part, data acquisition panel, data analysis guidance panel and the main interfacial effect of operation such as Figure 10.Waveform display part such as Figure 11.

During the data acquisition module block operations, click the data acquisition knob on the duty, just can obtain the data acquisition panel figure represented as Figure 12.The start time of data acquisition can be set, the concluding time, and gather T.T., by being set, switch can carry out the start-stop of capture program.

The data of gathering are analyzed, mainly comprised correlation analysis, power spectrumanalysis and the damping property analysis of gathering signal.The result who analyzes shows with the form of figure.

Above-mentioned whole programs are carried out commissioning test research, the commissioning test emulator that can carry by LABVIEW, detect the performance of moving that programs, and the error situation that occurs, carry out time update, proceed program after the modification, carry out the platform experiment on-the-spot test, the enforceability energy of proving program.The partial results of operation can be seen on above several control panels.

When system is hydraulic servo measuring and controlling equipment to the rubber vehicle vibration damper, process is to the charge oil pressure analysis, the analysis of actuating unit output characteristics such as servo-valve volumetry and hydraulic cylinder area change, if having determined the peak swing of acceleration is 2g, the displacement amplitude of vibration damper is 15mm, vibration frequency is 1～50Hz, the diameter that can utilize experimental formula to calculate the piston rod of servo hydraulic cylinder is taken as 50mm, can utilize the piston rod movement speed that calculates hydraulic cylinder area and servo hydraulic cylinder, utilize the experimental formula of the rated flow of they and servo-valve to determine and select the rated flow of servo-valve to be 400L/min, rated pressure is parameters such as 21MPa.Through modeling and the measuring and calculating to the TT﹠C system transport function, and carry out simulation analysis, proved the correctness of this theoretical analysis and system parameter selection.If analyze and research to having the interval rubber shock absorber that requires of other various acceleration, displacement amplitude and vibration frequency, utilize above-mentioned same research method, determine and adjust the parameter size of hydraulic servo measuring and controlling equipment.

The above only is preferable enforcement use-case of the present invention, is not for limiting protection model figure of the present invention.Within the spirit and principles in the present invention all, any modification of doing, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.

Claims (2)

1. the rubber shock absorber TT﹠C system that drives based on the acceleration feedback information is characterized in that: comprise rubber shock absorber passive vibration isolation main body mechanical hook-up, sensor, electric liquid drive system, D/A conversion and signal amplifier, signal conditioning circuit, multi-function data acquisition card, main control computer, dynamic property TT﹠C software;

Described rubber vehicle vibration damper passive vibration isolation main body mechanical hook-up connects described sensor, described electric liquid drive system respectively; Described electric liquid drive system connects described D/A conversion and signal amplifier; Described sensor connects described signal conditioning circuit; Described signal conditioning circuit connects described multifunctional data acquisition card; Described multifunctional data acquisition card and described D/A conversion and signal amplifier are connected respectively to described main control computer;

Described sensor comprises displacement transducer, acceleration transducer, power sensor;

Described main control computer design has described dynamic property TT﹠C software, the data readback that this software is gathered signal by the accelerating curve, displacement curve and force curve three tunnel simulating signals that obtain from described data collecting card collection, fundamental frequency is analyzed, data filtering, power spectrumanalysis, correlation analysis, damping characteristic is analyzed, and shows the merit specificity analysis, and extract quantity of state from test signal, be used for the comparison operation of electrohydraulic servo-controlling system, realize the control that shaking platform drives based on acceleration.

2. the rubber shock absorber TT﹠C system that drives based on the acceleration feedback information as claimed in claim 1, it is characterized in that: described dynamic property TT﹠C software comprises main interface module, data acquisition module, data analysis module; Data sheet output and display module;

Described main interface module: adopted basic design principles of man-machine interface during this modular design, the interactive interface that is used for this project test is directly perceived, succinct, attractive in appearance, suitable, easy to operate.Be used for connecting tasks such as data acquisition module, data analysis module and data sheet print module.The panel designs of this virtual instrument module the relevant user's master menu of test and use the panel knob, the user can be convenient to use handle instrument work.

Described data acquisition module: be used for analog quantity and switching value that the collecting device upper sensor measures, mainly comprise and gather acceleration signal, force signal and displacement signal etc., and in this test platform, make oscillograph, have the real-time Presentation Function of signal, and data complete preservation is in time got up.

Described data analysis module: the related data waveform that will gather signal shows, and it is carried out filtering handle.Data in the saving file are carried out dynamic signal analysis, comprise power spectrum, autocorrelation analysis, cross-correlation analysis etc., to obtain signal frequency-domain and time domain specification.

Described data sheet output and display module: the information that obtains after being used for analyzing is carried out form or form demonstration, printing and output function.The report display of this module mainly shows pumping signal, original frequency signal, stops frequency signal, acquisition time demonstration etc., and form shows the main form data such as pumping signal, displacement amplitude, acceleration amplitude, acquisition time that show.

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