CN105181239A - Test platform dynamic performance evaluation method with input and output signal waveform comparison - Google Patents
Test platform dynamic performance evaluation method with input and output signal waveform comparison Download PDFInfo
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Abstract
The invention provides a test platform dynamic performance evaluation method with input and output signal waveform comparison, belonging to the field of dynamic performance testing. The method can be applied to the fields of mechanical engineering, aerospace and the like to evaluate the dynamic performance of a test platform. An experimental device is formed by a signal generator, a power amplifier, a rubber rope, a vibration exciter, a jack, an impedance head, a test bench, a test platform, a charge amplifier, a data acquisition card and a computer. The evaluation method comprises the following steps that the ratio of an output waveform vertical coordinate absolute value to a horizontal coordinate time integral and an input waveform vertical coordinate absolute value to the horizontal coordinate time integral in the same cycle are compared, the dynamic performance of the test platform is good if the ratio is close to 1. The test device is simple, the operation is easy, the evaluation method is intuitive and easy to understand, the dynamic performance of the test platform can be quickly determined, and the method has broad application space.
Description
Technical field
The invention belongs to dynamic performance testing field, relate to a kind of assessment method that can be used for test platform dynamic property in Aero-Space.
Background technology
National defence and the requirement of aerospace field to measuring accuracy more and more higher, this proposes new requirement to the design of test macro; To in test platform, sensor is critical component, and the quality of its performance directly has influence on the precision of measurement, and especially the quality of its dynamic property directly affects the accuracy of measurement and the real-time of control.At present, comparatively deep to the Study on Static Characteristic of force snesor both at home and abroad, and less for the research of dynamic perfromance.Along with the development of high-accuracy testing tool in modern age, measurement means and the method for static force value are gradually improved, and measuring accuracy also improves constantly.Method for dynamic force value " quiet mark is employed " then is often carried out, namely only according to data result during transducer dwell calibration as foundation during dynamic test.Along with technical progress, the requirement of people to dynamic force measurement precision is more and more higher.For this reason, first the user of force snesor will carry out dynamic calibration to force snesor, understands its dynamic perfromance.A force snesor is probably good in measurement static force duty, dependable performance, but when measuring dynamic force, distortion is very large, even cannot work, be very important so carry out corresponding dynamic calibration to force snesor.Rocket propulsion technology, as core technology wherein, receives much concern especially.The accurate control of rocket engine thrust is significant to control aircraft operation attitude, raising targeting precision etc., a kind of new piezoelectric quartz thrust and Thrust Vector Measuring Platform system are developed and develop on this basis just, by experiment dynamic calibration is carried out to test platform and obtain its dynamic property, and find a kind of method evaluating its dynamic property quality and have great importance.
Whether traditional dynamic property assessment method main detection input and output waveform image is consistent, do not have clear and definite theoretical method accurately to express input-output wave shape relation.Therefore the test platform dynamic property assessment method designing the contrast of a kind of constrained input signal waveform is very necessary.
Summary of the invention
The technical barrier that the present invention will solve is the Dynamic Calibrating Experimental Device building a kind of test platform, by carrying out dynamic calibration to test platform, obtain its input signal and signal output waveform curve, and design a kind of test platform dynamic property assessment method of constrained input comparison of wave shape, the dynamic property quality of test platform can be judged intuitively, simply, easily.
The technical solution adopted in the present invention is: a kind of test platform dynamic property assessment method of constrained input comparison of wave shape, this assessment method equipment therefor comprises signal generator, power amplifier, vibrator, rubber rope, push rod, reluctance head, testboard bay, test platform, charge amplifier, data collecting card and computing machine, and test platform is the platform for testing rocket engine thrust vectoring.The pumping signal that signal generator produces is input to vibrator after power amplifier amplifies, and vibrator is connected with reluctance head by push rod; Reluctance head is fixed on test platform, and the dynamic force value signal measured by it is divided into two-way: a road is directly inputted in computing machine through charge amplifier and data collecting card, and the signal waveform collected is input signal; Another road first through test platform, then is input in computing machine through charge amplifier and data collecting card, and the signal waveform collected is output signal.Produce pumping signal by signal generator, transform through a series of signal and gather, obtain the input signal of test platform and the power-time waveform figure of output signal respectively; Within the same cycle, the ordinate force value of the power-time waveform figure of comparator input signal and output signal and the ratio of horizontal ordinate time integral, close to 1, this ratio more illustrates that the dynamic property of test platform is better.
Remarkable result of the present invention is: the test platform dynamic property assessment method of a kind of constrained input signal waveform contrast of inventing, its experimental provision is simple, simple operation, assessment method is directly perceived, understandable, the quality of test platform dynamic property can be judged rapidly, can be applied in the evaluation of the field such as mechanical engineering, Aero-Space about test platform dynamic property, there is wide application space.
Accompanying drawing explanation
Fig. 1 is test platform dynamic property standardization experimental apparatus figure.
Fig. 2 is the mounting means schematic diagram of vibrator.
The dynamic force oscillogram that Fig. 3 records when being standard trapezoid force signal.
The dynamic force oscillogram that Fig. 4 records when being triangular wave force signal.
The dynamic force oscillogram that Fig. 5 records when being square wave force signal.
In figure: 1 testboard bay; 2 test platforms; 3 reluctance heads; 4 push rods; 5 vibrators; 6 rubber ropes;
7 input waveforms; 8 output waveforms.
Embodiment
Combination technology scheme and accompanying drawing describe implementation process of the present invention in detail, as shown in Figure 1, select electrodynamometer type vibrator 5 as actuator, be equipped with corresponding excitation signal generator and power amplifier, realize required dynamic force, and come force input and the power output signal of collecting test platform by computer data acquisition system.
Experimentation of the present invention is as follows: connect according to being installed by various equipment shown in Fig. 1, adopt rubber rope 6 to be suspended on stand by vibrator 5, vibrator 5 is connected with reluctance head 3 by push rod 4, and is connected with the joint flange of Thrust Vector Measuring Platform to be calibrated.After power amplifier amplifies, vibrator 5 is input to after pumping signal is produced by signal generator.The dynamic force value that vibrator 5 exports under pumping signal effect is obtained by reluctance head 3.Reluctance head 3 is fixed on test platform 2, and the signal measured by it is divided into two-way: a road signal is directly inputted in computing machine through charge amplifier and data collecting card, collects signal waveform by testing software, is the input signal of test platform; Another road signal first after test platform, then is input in computing machine through charge amplifier and data collecting card, collects signal waveform by testing software, is the output signal of test platform, finally processes the input collected, output signal.
As shown in Figure 2, the mounting means of vibrator 5 adopts the mode of hanging type horizontal exciting, in this case, for certain precompression can be produced to test specimen, hang certain angle that often will tilt, this mode requires that the resonant frequency of the suspension that vibrator 5 and rubber rope 6 are formed is much smaller than frequency of operation.Adjustable rubber rope 6 length during experiment, make it be in the work of minimum rigidity section, the now relative elongation of rubber rope 6 is about about 30-40%, and the natural frequency of whole suspension can reach about 0.6-0.8Hz, and this installation method is comparatively simple.
The signal generator adopted in this experiment is using single-chip microcomputer as core component, required pumping signal is realized by associated digital electronics such as D/A converters, apply the standard trapezoid dynamic force that the cycle is 20ms respectively, the triangular wave dynamic force that rising edge/negative edge is respectively 3ms, the cycle is 20ms, the square wave dynamic force that dutycycle is 35%, the cycle is 20ms, vibrator work is driven as pumping signal, obtain under different excitation signal, the dynamic force curve of input and output is respectively shown in Fig. 3,4,5.
In the three kinds of situations experimentally obtained, under calculating often kind of situation respectively, within the same cycle, output waveform ordinate force value to horizontal ordinate time integral and input waveform ordinate force value to the ratio of horizontal ordinate time integral.
Namely
Wherein, t
1and t
2be respectively the beginning and ending time of one-period, F
1(t) for force value in input signal is to the function of time, F
2(t) for output signal in force value to the function of time, this experiment in t
2-t
1=0.02s.According to the r value calculated, if r is more close to 1, illustrate that the dynamic property of test platform under respective waveforms is better; Otherwise, illustrate that the dynamic property of test platform under respective waveforms is poor.
The test platform dynamic property assessment method of a kind of constrained input signal waveform contrast of the present invention, its experimental provision is simple, simple operation, assessment method is directly perceived, understandable, the quality of test platform dynamic property can be judged rapidly, can be applied in the evaluation of the field such as mechanical engineering, Aero-Space about test platform dynamic property, there is wide application space.
Although the present invention to invention has been detailed description, not limits the present invention with above-described embodiment with above-mentioned preferred embodiment.Those skilled in the art should recognize when the technical characteristic do not departed from given by the present invention and scope, the increase done technology, with the replacement of some same contents of this area, all should belong to protection scope of the present invention.
Claims (1)
1. the test platform dynamic property assessment method of a constrained input comparison of wave shape, it is characterized in that, this assessment method equipment therefor comprises signal generator, power amplifier, vibrator, rubber rope, push rod, reluctance head, testboard bay, test platform, charge amplifier, data collecting card and computing machine; Test platform is the platform for testing rocket engine thrust vectoring; The pumping signal that signal generator produces is input to vibrator after power amplifier amplifies, and vibrator is connected with reluctance head by push rod; Reluctance head is fixed on test platform, and the dynamic force value signal measured by it is divided into two-way: a road is directly inputted in computing machine through charge amplifier and data collecting card, and the signal waveform collected is input signal; Another road first through test platform, then is input in computing machine through charge amplifier and data collecting card, and the signal waveform collected is output signal; Produce pumping signal by signal generator, transform through a series of signal and gather, obtain the input signal of test platform and the power-time waveform figure of output signal respectively; Within the same cycle, the ordinate force value of the power-time waveform figure of comparator input signal and output signal and the ratio of horizontal ordinate time integral, close to 1, this ratio more illustrates that the dynamic property of test platform is better.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060239A (en) * | 2018-06-15 | 2018-12-21 | 西北工业大学 | A kind of pulse-knocking engine test bay thrust test dynamic calibrating method and device |
| CN110333033A (en) * | 2019-07-16 | 2019-10-15 | 大连理工大学 | A kind of scaling method based on transducer sensitivity difference dynamometer |
| CN110568836A (en) * | 2019-08-14 | 2019-12-13 | 上海航天控制技术研究所 | dynamic performance debugging method and system suitable for servo system |
| CN112595479A (en) * | 2020-06-05 | 2021-04-02 | 中国航空无线电电子研究所 | Sine wave waveform combination compensation method for arresting impact test |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060239A (en) * | 2018-06-15 | 2018-12-21 | 西北工业大学 | A kind of pulse-knocking engine test bay thrust test dynamic calibrating method and device |
| CN110333033A (en) * | 2019-07-16 | 2019-10-15 | 大连理工大学 | A kind of scaling method based on transducer sensitivity difference dynamometer |
| CN110333033B (en) * | 2019-07-16 | 2020-11-13 | 大连理工大学 | Calibration method based on sensor sensitivity difference dynamometer |
| CN110568836A (en) * | 2019-08-14 | 2019-12-13 | 上海航天控制技术研究所 | dynamic performance debugging method and system suitable for servo system |
| CN110568836B (en) * | 2019-08-14 | 2020-07-28 | 上海航天控制技术研究所 | Dynamic performance debugging method and system suitable for servo system |
| CN112595479A (en) * | 2020-06-05 | 2021-04-02 | 中国航空无线电电子研究所 | Sine wave waveform combination compensation method for arresting impact test |
| CN112595479B (en) * | 2020-06-05 | 2023-03-31 | 中国航空无线电电子研究所 | Sine wave waveform combination compensation method for arresting impact test |
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Application publication date: 20151223 |