SU807104A1 - Device for control of vibration tests - Google Patents

Description

The invention relates to testing equipment, namely, vibration test control devices and can be applied in mechanical engineering. A vibration control device is known, which contains a master oscillator, a vibration exciter, vibration transducers installed on the tested product, switches whose inputs are connected to the vibration transducers, a switch, measurement and indication means 1. The disadvantage of the device is that the choice of vibration transducer with the required Parg Letrom is done manually. The closest to the proposed technical entity is a vibration test control device containing a given generator with a control unit, H vibration transducers mounted on the product under test, a selector whose inputs are connected to the vibrator oscillator outputs, and the output control unit of the generator 2 is connected to the output. the device is that it is intended to control the vibration excited only by the sweep frequency method. This is due to the fact that the selector rectifies the vibration transducer signals and only one DC signal is generated at the output of the selector to control the level of the signal generated by the master oscillator. The purpose of the invention is to expand the functionality of the device. This goal is achieved by the fact that the device is equipped with a serially connected time programmer, a pulse generator, a counter having a zero position input, a decoder, a switch having N inputs connected to the corresponding decoder outputs, N counting outputs and a reset output that is connected. to the input of the counter to zero position, by the register and the first switch, the output of which is connected to the input of the control unit, and the inputs to the outputs of the vibration transducers, And, the selector contains in series, connected the second switch, the inputs of which are connected to the outputs of the vibration transducers, and analyzer, the output of which is keying keys through the element I to the register, with the N counting outputs of the switch connected to the inputs of the register and the second switch.

.Ba shows the block diagrams of the device.

The device contains a control generator .1 of the master oscillator 2, the exciter 3 oscillations, N vibrator 4 installed on the test product (not shown), the first and second, switches 5 and b, respectively, to the inputs of which are connected the outputs of vibrator 4, analyzer 7, Element And 8, in series connected gene-. torus 9 pulses, counter 10, having a setup input to zero position and counting output and input, decoder AND, input connected to the counting output of counter 10, switch 12, the reset output of which is connected to the input of setting the counter 10 to zero position, the time programmer 13 connected to the pulse generator 9, the register 14, the N inputs of the switch 12 are connected to the corresponding outputs of the decoder 11, the N counting outputs of the switch 12 are connected to the inputs of the register 14 and the second switch 6.

The device works in the following way.

In controlled points of the product, N vibration transducers 4 are installed. Since the reactions are separate. parts, the product of vibration is different then the output signals of the vibration transducers 4 are not equal to each other. These output signals are fed to the inputs of switches 5 and 6. Switching switch 6 is performed by a signal from switch 12, which has N counting outputs, each of which is set to vibrator number (VP) 4. Switch 12 also has a reset output connected to input installation of the counter 10. Before the start of the test or during the tests, the VP number is set at each counting output of switch 12, and setting the number, for example, the 5th vibrator on the first counting output ne4) Switch 12 means that the 5th vibration transducer will be polled by switch 6 in the first place, installed on the second counting output - it will be polled second, etc. On the programmer 13, a number equal to the polling duration of the switch 6 of the same VI is dialed. In this case, the generator 9 generates pulses whose period is equal to the number on the programmer 13. These pulses are fed to the counting input of the counter

10, at the counting output. WHICH the number in the binary code increases linearly to the maximum, equal to -1, then drops to zero and again linearly increases. The output of counter 10 is decrypted by decoder 11, at the outputs of which a logical i appears successively at zero, at the first, and so on. exits. Vivsh with logical, for example, at the first output. The decoder 11 passes to the second counting output of the switch 12. At the same time, the switch b is connected to its input. VP, the number of which corresponds to the number dialed at the second counting output of the switch% 12. When a new pulse occurs at the output of the generator 9, the switch

6 connects to its input the VP, whose number corresponds to the number dialed at the third counting output of switch 12, etc. Thus, switch 6 can interrogate the VI in any order, so when dialing on all counting outputs, the switch 12 bodies of the same number to the analyzer

7 connects one VP. When installed on - that counting output rtepe switch 12 O

the logical unit arriving at this output goes through the reset output of switch 12 to the input of setting the counter 10 to the zero position. In this mode, the switch 6 performs a sequential interrogation of the VI from the first to the ith, connecting the VI to the input of the analyzer 7. The analyzer 7 analyzes the signals arriving at it through the switch b. At the same time, according to his program, he selects a signal with either a maximum level or a minimum level, or an average signal among all the signals connected by the switch 6. At the moment when a given signal is detected, the output of the analyzer 7 forms a logical unit, which is fed to the input of the AND element 8, allowing the output of a pulse from generator 9 to pass to it. This pulse enters the input of register 14a by writing information from switch 12 to it. This information appears at the output of the I4jconnect register to the output at the switch .5, the VI that is currently connected through switch 6 to the analyzer 7. Thus, the output signal of the VI through switch 5 is fed to control unit 1, which controls the operation of generator 2, i.e. The feedback loop of the device is closed through an automatically selected VI.

If, during operation, the distribution of the signal levels at the outputs of all VIs does not change, then the analyzer 7 selects the number of one and

the same VI, the information at output 14 does not change, and the device closes the feedback circuit through one and tOT of the same VI. If the distribution of signal levels at the outputs of the VI changes, then during the next polling cycle of switch 6. Switch 5 closes the feedback circuit of the device through that VI, the number of which was selected by analyzer 7.

Thus, the switch 5 closes the feedback circuit of the device. The switch 6 periodically polls the VI with the speed set by the programmer 13 of time. The numbers and polling order of vibration transducers 4 are set by switch 12.

The proposed device lays down to work on any vibration signals. The generator 2 can specify either a narrowband signal, or a polyharmonic, or random wideband.

The device allows you to automatically control vibration levels and select a vibration transducer with the required vibration parameter.

Claims (2)

1. Instruments and systems for measuring vibration, noise and shock. Handbook. M., Mechanical Engineering, 1978, Vol. 2, s. 204, fig. 7 2. Instruments and systems for measuring vibrations, noise and shock. Spra- .. vochnik.M., Mechanical Engineering, 1978 Prince 2, s. 160, fig. 13 (prototype).