RU77968U1 - COMPLEX UNSTATIONARY VIBRATION IMPACT SYSTEM - Google Patents

Abstract

The utility model relates to testing equipment and can be used to create short-term dynamic processes (for example, shock pulses) on electrodynamic and electro-hydraulic vibration stands and to measure the parameters of these processes. The essence of the proposed utility model consists in the addition of a clock pulse generator, a second measuring channel, an adder, to the hardware system containing a vibration test complex, a measuring channel, an aperiodic oscillation generator, a signal amplitude meter, a frequency filter, a switch, a gating unit, and a computer complex AC voltage source (broadband random, narrowband random or harmonic) and multi-pin relay. This ensures the formation of a vibration test mode, which is a limited in duration or continuous in time exposure containing an unsteady component (for example, a shock pulse). The proposed utility model provides the determination of the necessary parameters of the reproducible process using computer software. This increases the accuracy of determining the parameters of reproducible processes and helps to improve the quality of laboratory vibration tests.

Description

The proposed utility model relates to test equipment and can be used to create short-term dynamic processes, such as shock pulses, on electrodynamic and electro-hydraulic vibrating stands, and to measure the parameters of these processes.

An analogue of the proposed utility model is the Dactron Digital Vibration Test System. The system contains software for generating a control signal transmitted to the power equipment of the vibration test complex, and means for receiving and processing signals through control and measurement channels. The system is designed to reproduce various vibrational modes (including shock pulses) on electrodynamic stands (see Dactron Inc. Technical Description and User Manual 1629 South Main Street Milpitas, CA 95035-6261 Web Site: www.dactron.com).

The software tools used in this system do not provide the formation of complex test modes (for example, the joint reproduction of continuous vibration and shock pulse). However, it should be borne in mind that these modes, in fact, correspond to the real operational state of modern technology. In addition, the high cost of acquisition and preventive maintenance costs inherent in imported equipment limits the possibility of its acquisition and possible operation.

An analogue of the prototype of the proposed utility model is a signal processing system in accordance with patent No. 62703 of 11.27.2006. The specified system contains an aperiodic oscillation generator, a vibration test complex, a measuring channel, a frequency filter, a signal amplitude meter, a spectrum analyzer, a pulse generator, a recorder, a thyristor cascade, an inverter, a strobing unit, and a computer complex.

The system provides the selection of useful signals from a broadband random process, representing either accompanying continuous vibration or external interference. At the same time, each new implementation is received in real time, and the results of the previous measurement are not saved and are not averaged. It is known that hardware processing performed in relation to a single implementation allows one to obtain a biased estimate of the parameters of the process under study. Determining an unbiased estimate requires ensemble averaging. The noted disadvantage of the prototype reduces the accuracy of signal processing and test quality in general.

The objective of the proposed utility model is the formation at the input of the vibration test complex of the driving signal, which is a short-term or continuous implementation containing an unsteady component (in particular, a shock pulse) and subsequent measurement of the parameters of the reproduced process.

The essence of the proposed utility model is that a clock system, a second measuring channel, an adder are additionally introduced into a hardware system containing a vibration test complex, a measuring channel, an aperiodic oscillation generator, a signal amplitude meter, a frequency filter, a switch, a gating unit, and a computer complex , AC voltage source (broadband random, narrowband random or harmonic) and multi-contact relay.

The inputs of the first and second measuring channels are interconnected, and their outputs are connected respectively to the first and second inputs of the switch. The output of the switch is connected to the input of the frequency filter, which is connected by its output to the input of the signal amplitude meter. The meter output is connected to the first input of the computer complex, to the second input of which the output of the clock generator is connected. In addition, the output of the clock pulse generator is also connected to the input of the aperiodic oscillation generator and to the first input of the gating unit, the second input of which is connected to the output of the adder, and the output of the gating unit is connected to the input of the vibration test complex. In this case, the first input of the adder is connected to the output of the aperiodic oscillator, and the second input is connected to the output of the AC voltage source. In addition, the input and output of the gating unit are connected to the first group of relay contacts, and the outputs of the adder and switch and the inputs of the vibration test complex and the frequency filter are connected to the second group of relay contacts.

The technical result of the proposed utility model is that it provides the formation of a vibration test mode, which is a limited in duration or continuous in time exposure containing an unsteady component (for example, a shock pulse). In this case, the proposed utility model provides the determination of the necessary parameters of the reproduced process using the software of a computer complex, in particular by averaging over the ensemble. This increases the accuracy of determining the parameters of reproducible processes and helps to improve the quality of laboratory vibration tests.

Figure 1 presents the block diagram of the system when it is in playback mode short-term implementation containing a shock pulse and the accompanying alternating process.

Figure 2 shows a block diagram of a system during its operation in the playback mode of a continuous implementation, also containing a shock pulse and an alternating process.

Figure 3 shows the connection of the system blocks with the relay contacts when the system is in the first specified mode, and figure 4 is a diagram of the connection of the system blocks with the relay contacts when working in the second specified mode.

Figure 1-11 of the Appendix are signal diagrams explaining the actual operation of the system.

The system shown in Fig. 1 contains an aperiodic oscillation generator 1, an adder 2, a stationary process source 3, a gating unit 4, a vibration test complex 5, measuring channels 6 ₁ and 6 ₂ , a switch 7, a frequency filter 8, a signal amplitude meter 9, a receiver 10 for implementing the process under study, a clock receiver 11, a clock generator 12. The receivers 10 and 11 are part of a computer complex and are located in a portable device, designated in figures 1 and 2 as LDS.

The system according to figure 1 has the following relationships of elements. The input of the shaper 1 of aperiodic oscillations is connected to the output of the clock generator 12, and the output of the shaper 1 is connected to the first input of the adder 2, with the second input of which the output of the source 3 of the stationary process is connected. The output of the adder 2 in the block diagram of figure 1 is connected to the first input of the gating unit 4, the output of which is connected to the input of the vibration test complex 5. In this case, the second input of the gating block 4 is connected to the output of the clock generator 12. The output of the vibration testing complex 5 is connected to the measurement inputs channels 6 ₁ and 6 ₂ , the outputs of which are respectively connected to the first and second inputs of the switch 7. The output of the switch 7 is connected to the input of the frequency filter 8, its output connected to the input of the meter 9 of the signal amplitude. The output of the meter 9 is connected to the input of the receiver 10 of the implementation of the investigated process. In addition, the clock generator 12 with its output is also connected to the input of the receiver 11.

The system made according to FIG. 2 has the following relationships, different from the block diagram of FIG.

The output of the adder 2 is connected directly to the input of the vibration testing complex 5, and not through the gating unit 4. The first input of the gating unit 4 is connected to the output of the switch 7, and the output of the gating unit 4 is connected to the input of the frequency filter 8. All other connections of the elements of the block diagram figure 2 are the same with the block diagram of figure 1

The relationship of the elements of the block diagram of figure 1 with the relay contacts are shown in figure 3.

The output of the adder 2 is connected to terminal 14 of the relay 13, the terminals 15 and 16 of the relay are connected respectively to the first input and output of the gating unit 4. The input of the vibration test complex 5 is connected to the terminal 17 of the relay. In addition, the output of the switch 7 is connected to terminal 18, and the input of the frequency filter to terminal 19 of the relay 13. The position of the contacts 14-15, 16-17 and 18-19 corresponds to the de-energized state of the relay coil 13.

The relationship of the elements of the block diagram of figure 2 with the contacts of the relay 13 are shown in figure 4.

The output of the adder 2 is connected to terminal 15 of the relay 13, and the input of the vibration test complex 5 is connected to terminal 17 of the relay. In this case, a specially installed jumper between the contacts 15 and 20 of the relay 13 provides the connection of the output of the adder 2 with the input of the vibration test complex 5. The output of the switch 7 through a series of contacts 18-22-23-14 of the relay 13 is connected to the first input of the gating unit 4, the output of which is through contacts 16-24-25 are connected to the input of the frequency filter 8. The specified connection between the output of the switch 7 and the first input of the strobing unit 4 is provided by a specially installed jumper between the contacts 22 and 23 of the relay 13. Similarly, the output b the gating lock 4 and the input of the frequency filter 8 is connected using a jumper between the contacts 24 and 25 of the relay 13. Position

pins 20-21, 18-22, 14-23 and 16-24 corresponds to the state in which the operating voltage is applied to the relay coil.

In the implemented version of the system, the following hardware was used:

- shaper 1 corresponds to a similar device described in patent No. 62703 from 11/27/06;

- adder 2 corresponds to the device described in the work “Electronic circuits. A practical guide ", J. Lenk, M.," World ", 1985, pp. 268-269;

- as a source of narrow-band random process 3, a noise generator 03004 and a narrow-band filter 01013 BP option are used, given in the technical description of VEB Robotron-Messelektronik Otto Schön Dresden ed. 04.89, 09.89;

- the Waveform source program block of the Photon computer system used in the RT Pro User Guide was used as the source of the broadband random process 3. Revision 6.0 LDS-Dactron 47300 Kato Road Fremont, CA94538 Web: www.lds-group.com;

- as a gating block 4, a signal selector for time 2972 is used, described in the catalog of the company "Blur and Kier" ed. 1974;

- as a vibration test complex 5, a power amplifier corresponding to the SPA-40k type is given in the passport of the manufacturer 347905 Taganrog, Rostov Region, ul. 2 Boiler room 28, “Rostec”, and a vibration stand corresponding to the D10A type, described in the reference book “Devices and Systems” under the editorship of V.V. Klyuyev, vol. 2 p. 291;

- as measuring channel 6, a vibration measuring integrating amplifier 00028, used in the technical description of VEB Robotron-Messelektronik Otto Schön Dresden ed. 09.88;

- together with the amplifier 00028, a KD-35 type piezo-accelerometer is used, which is given in the technical description “Piezoelectric acceleration sensors” VEB Metra und Frequenztechnik Radebeul ed. 10.81;

- as switch 7, a two-channel switch 04002 is used, given in the technical description of VEB Robotron-Messelektronik Otto Schön Dresden ed. 11.84;

- as a frequency filter 8, a narrow-band filter 01013 (option TP or HP) is used, given in the technical description of VEB Robotron-Messelektronik Otto Schön Dresden ed. 09.87;

- as the meter of signal amplitude 9, the indicator block 02036 is used, given in the technical description of VEB Robotron-Messelektronik Otto Schön Dresden ed. 06.88;

- as a computer complex (receivers 10 and 11 in the LDS remote unit as an integral part), the Photon system described in RT Pro Dynamic Signal Analysis was used. User's manual. Revision 6.0 Web site: www.lds-group.com;

- as the generator of clock pulses 12 used the generator 03005, given in the technical description VEB Robotron-Messelektronik Otto Schön Dresden ed. 12.88;

- as the relay indicated in figure 2 and 3, used relay REN 33 of the Russian Federation 4510022.

All of the indicated hardware corresponds to its functional purpose.

A system designed to reproduce short implementations containing an alternating component and a shock pulse, operates as follows (see figures 1 and 3 and diagrams 1-11 of the Appendix).

The signal U ₁ , which is a short rectangular pulse, from the output of the clock 12 is fed to the input

shaper 1 aperiodic oscillations and puts it into action. In this case, at the output of the former 1, a signal U _{2 is created} , the structure of which is shown in FIG. The controls of the shaper 1 regulate the parameters of the signal U ₂ - the amplitude, frequency of the forming oscillation, duration, phase, repetition period. The signal U ₂ from the output of the shaper enters the first input of the adder 2, the second input of which from the output of block 3 receives the signal U ₃ , which is an alternating voltage (broadband or narrowband random, harmonic). The controls of the adder 2 and source 3 control the parameters of the signal U ₄ at the output of the adder: the frequency composition and level of the alternating voltage, as well as the ratio of the amplitude of the aperiodic oscillation to the mean square value of the signal U ₃ . The waveform U ₄ at the output of the adder is shown in figure 2 of the Appendix. The signal U ₄ from the output of the adder 2 is transmitted to the first input of the gating unit 4, the second input of which from the output of the clock generator 12 receives a pulse U ₁ , which drives the gating unit 4. In this case, at the output of the gating unit 4, a time period (sampling) from the signal U _{4 is formed} . The temporary location and duration of the signal U _{5 are} regulated within the required limits.

The implementation of the integrated dynamic short process reproduced by the shaker is shown in FIG. 3 of the Appendix. This process, converted by a piezo-accelerometer into an electric signal U ₆ , is simultaneously supplied to the inputs of the measuring amplifiers 6 ₁ and 6 ₂ . The measuring amplifier 6 ₁ operates in direct amplification mode, creating an output signal U ₇ , the value of which is proportional to vibration acceleration. Measuring amplifier 6 ₂ operates in dual integration mode; the signal U ₈ generated at its output is proportional to vibration displacement. The nature of such a signal is shown in FIG. 4 of the Appendix. The measuring amplifiers 6 ₁ and 6 ₂ are set during calibration. Units of measurement and sensitivity coefficient of each channel are entered into the computer processing program.

The passage of signals U ₄ from the output of the adder 2 to the first input of the gating unit 4 and U ₅ from the output of the gating unit 4 to the input of the vibration-testing complex 5 is shown in Fig. 3, where the contact numbers of the relay 13 are indicated. Similarly, Fig. 3 shows the signal transmission U ₉ from the output of the switch 7 to the input of the filter 8. When playing short-term dynamic processes, the relay coil 13 is in a de-energized state. The switch 7 alternately transmits the signals U ₇ and U ₈ to the input of the equipment connected to its output.

The signal U ₉ from the output of the switch goes to the input of the frequency filter 8. In cases where, according to the conditions of the experiment, there is no need to select the frequency band of the process under study, the frequency filter 8 operates in a linear mode. The signal U ₉ at the output of the filter 8 and U ₁₀ at the output of the meter 10 repeat the signal structure at the output of the measuring amplifier 6 ₁ or 6 ₂ . If you want to enter restrictions on the measuring range, the filter 8 is included in the operation in the low-pass filter mode or in the high-pass filter mode.

The mode of operation and the value of the cutoff frequency are set when filter 8 is set. The signal U ₁₀ from the output of the meter 9 is transmitted to the input of the receiver unit 10 of the process under study. Block 10 is an integral part of a computer complex. Essentially, this block represents the first input of a computer complex.

The signal U ₁ from the output of the clock 12 is also fed to the input of the block 11 of the clock receiver. Block 11 is also part of the computer complex and, in fact, represents its second input.

When processing unsteady signals, a computer complex is activated from the moment of receipt of a clock pulse U ₁ at the input of block 11. The pulse parameters U _{1 are} indicated in the program that controls the operation of the receivers 10 and 11.

As an example of the processing of the signal U _{9 by} a low-pass filter, Figures 5 and 6 of the Appendix show implementation of a shock pulse at the input and output of filter 8, respectively.

Processing the only implementation presented in the diagrams of Figures 5 and 6 of the Application corresponds to the same dynamic process under investigation.

The software of the Photon computer complex used in the proposed invention provides the following types of processing:

- reception and registration of a single implementation of a short-term dynamic process;

- reception and processing of the implementation sequence of the investigated dynamic process with averaging over the ensemble;

- spectral and correlation analysis for both a single implementation and an ensemble of implementation.

Fig. 7 of the Appendix shows the implementation of the shock pulse obtained by averaging over the ensemble of 20 implementations, and Fig. 8 of the Appendix shows the spectral composition of the pulse obtained in the same way. Averaged values represent unbiased estimates of the parameters of the process under study.

If it is necessary to measure the spectral composition of the alternating component of the process under study (broadband random or narrowband random), filter 8 is turned on in the high-pass filter mode (HP option in the Robotron type 01013 hardware unit). An example of the result obtained when the system is operating in this mode is presented in FIG. 9 of the Appendix.

A distinctive feature of the system when reproducing continuous implementations containing a shock pulse and the accompanying alternating process, is as follows (see figure 2 and 4).

The relay coil receives power from an external source. In this case, the gating unit 4 is disconnected from the circuit between the output of the adder 2 and the input of the vibration test complex 5 and is connected to the circuit between the output of the switch 7 and the input of the frequency filter 8. At the same time, the output of the adder 2 is connected to the input of the vibration test complex 5.

The relay contacts through which these connections are made are shown in Fig. 4. In this case, the connections between contacts 1-2, 7-8, 10-11 and 4-5 represent the normal positions when the relay is activated, and the connections between contacts 3-10, 11-6, 1-7 and 4-9 are created by specially installed jumpers . In accordance with these connections, the signal U ₄ from the output of the adder 2 is transmitted to the input of the vibration test complex 5, and the signal U ₉ from the output of the switch 7 is fed to the first input of the gating unit 4. In this case, the complex process is reproduced by the vibration testing complex 5 continuously, to the first input of the gating block 4 from the output of the switch 7 receives the implementation of U ₉ continuous process. The gating unit 4 generates at its output a sample of U ₅ containing a shock pulse together with an alternating signal. The sampling time parameters U ₅ (duration and position of the leading edge) are set by the necessary adjustment of the gating unit 4.

10 and 11 of the Application, as an example, the time functions of the signal U ₉ at the input of the gating unit 4 and the signal U ₅ at its output are shown.

The transmission of both signals to the input of the computer complex and their processing are performed in real time.

Claims (1)

A system for reproducing complex non-stationary effects, comprising an aperiodic oscillation generator and a vibration-testing complex, a measuring channel, a switch, a frequency filter, a signal amplitude meter and a computer system, as well as a gating unit, characterized in that an adder, a source of a random process, are introduced into it measuring channel and a clock generator, as well as an electromagnetic relay, while the inputs of the measuring channel and the second measuring the channels are interconnected, and their outputs are respectively connected to the first and second inputs of the switch, the first input of the computer complex is connected to the output of the signal amplitude meter, and the second input of the computer complex is connected to the output of the clock generator, simultaneously connected to the input of the aperiodic oscillator, the output connected to the first input of the adder, the second input of which is connected to the output of the source of the random process, in addition, the output of the clock generator is connected to the first input of the gating block, while the second input of the gating block and its output are connected to the first group of relay contacts, and the inputs of the vibration-testing complex and the frequency filter and the outputs of the adder and switch are connected to the second group of relay contacts.