SU1348659A2 - Oscillation regulating device - Google Patents

Abstract

This invention relates to a testing technique. The aim of the invention is to increase the reliability of the tests due to the possibility of the reproduction of a wide class of pulse signals by the vibrostand. The device for controlling oscillations comprises a periodic oscillator 1, which produces signals of various shapes amplified by the first correction amplifier 2, and through the amplitude regulator 3, key element 4 and power amplifier 5 supplied to the vibrator 6. The signal from the vibrator table 6 through the vibrator 7, matching amplifier 8, the second correction amplifier 9 and the meter 10-peak values are fed to the unit 11pam tees, which fixes the maximum value of the signal before the next pulse on you ode vibrator 6. The captured at the time of the pause voltage is compared with a reference in the comparison unit 12 and supplied to a control input of the controller 3 of the amplitude, adjusting the amplitude of the pulse to the required level. The gain factors K /), and the Cdc of the first and second correction amplifiers 2 and 9, respectively, are chosen such that the amplitude-frequency characteristic of the system is linear, i.e. input and output waveforms will match, which will increase the reliability of the tests. 2 Il. c & from 4; 00 O5 ate with N) srig. one

Description

1 I

The invention relates to a test technique, can be used to test products for impulse loads, and is additional to the invention according to the author. St. No. 1068905.

The aim of the invention is to increase the reliability of the tests due to the ability of the vibrostand to reproduce a wide class of pulse signals.

FIG. 1 is a block diagram of a device for controlling oscillations; in fig. 2 - stress diagrams for reproduction of trapezoidal pulses in the vibrostand.

The device for controlling the oscillations comprises a series-connected periodic signal generator 1, a first correction amplifier 2, an amplitude regulator 3, a key element 4, a power amplifier 5, a vibrator 6, a vibrator 7, a matching amplifier 8, a second correction amplifier 9, a peak meter 10, a memory unit 11 and a comparison unit 12 with two inputs, to the second input of which a constant reference voltage is applied, the output is connected to the second input of the 3 amplitude controller, connected in series to form The receiver of 13 rectangular signals, the first differentiating unit 14, element 15 and the first trigger 16, the input of the driver 13 of the standard signals are connected to the output of the amplitude regulator 3 and the input of the key element 4 connected in series to the inverter 17 and the second differentiating unit 18, whose output connected to the second input of the first trigger 16, the pulse counter 19, the first input of which is connected with the output of the square wave imager 13, the input of the first differentiating unit 14 and the input of the inverter 17, the pulse number setting unit 20 which is connected with the output of the key element 4 and the input of the power amplifier 5, the output is connected with the second input of the pulse counter 19, the second trigger 21, the first input of which is connected with the output of the counter 19 pulses, the output connected with the second input of the element 15, the third a differentiator 22, the input of which is associated with the output of the first trigger 16, the second input of the key element 4, and

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the second input of the memory unit 1-1, and the output is connected with the second input of the second trigger 21.

The device works as follows.

The generator I of periodic signals produces signals of various shapes (triangular, sinusoidal,

Yu trapezoidal, etc.). The periodic signal (Fig. 2a) is amplified by the first correction amplifier 2, converted into square pulses (Fig. 26) by the former 13.

15 rectangular signals. This signal is differentiated by the first differentiating unit 14, and only positive pulses are used (Fig. 2c), corresponding to the beginning of the pulses.

20 of the driver 13. At the same time, the rectangular signal is inverted by the inverter 17 and enters the second differentiating unit 18. Thus, positive pulses are generated

25 (FIG. 2d), corresponding to the end of the pulses of the former 13 rectangular signals. The signal from the output of the shaper 13 rectangular signals is fed to the input of the counter 19 pulses, operating in the divider mode. The number of pulses recorded in the pulse counter 19 determines the pause between the output pulses. At the output of counter 19, a pulse appears

jg (FIG. 2d), which sets the second trigger 21 to a single state (FIG. 2e). From the output of the second trigger 21, the signal goes to the input of the element 15, to another input of which pulses are output from the output of the first differentiating unit 14. At the output of the element 15, an impulse appears (fig. 2g) setting the first trigger 16 . The output45 of the first trigger 16 (FIG. 2h) controls the key element 4.

Thus, at the moment when the pulse starts, the key element 4 opens and the signal from the generator 1 gQ output of periodic signals through the first correction amplifier 2, the amplitude regulator 3 and the power amplifier 5 is fed to the moving coil of the vibrator 6 (Fig. 2k).

gg. At the same time, the signal from the output of the first trigger 16 is fed to the input of the memory block 11 and prepares it for measuring the output signal to

vibrator platform 6. Signal from hundred

15

3I3A8659

on the vibrator 6 through the vibrator 7, the matching amplifier 8, the second correction amplifier 9, the peak meter 10 goes to the memory block 11, which fixes the maximum value of the signal before the next pulse at the output of the vibrator 6. The voltage fixed at the moment of pause in unit 12 of the comparison, and is fed to the control input of the amplitude controller 3, adjusting the amplitude of the pulses to the desired level.

At the moment the pulse ends, the pulse that sets the first trigger 16 to the initial state arrives at the fault input of the first trigger 16 from the output of the second differentiating unit 18, and the key element 4 and the memory unit 11 are switched off. The signal from the output of the third differentiating unit 22 (Fig. 2i) returns the second trigger 21 to the initial state. The unit 20 of the number of pulses, connected to the output of the key element 4, counts the number of pulses and, when the number of pulses reaches their number, stops the counter 19.

The necessity and usefulness of introducing the first and second correction amplifiers 2 and 9 is explained by the following factors. Denote the transferW, (P)

KiKv- Wft (P)

H-K ,,, W (P)

where k

1KV

and K

9KV

- the gains of the 1st and 2nd correction amplifiers 2 and 9, respectively.

If at the same time in a certain frequency range W (P) -K, 1, then in this frequency range

W, (P) t. | .

Qif

The last relation means that the amplitude-frequency characteristic of the system is linear, i.e. the input and output waveforms will coincide, which increases the availability of JBepHOCTb tests and allows for the reproduction of arbitrary shocks, including those that exist under operating conditions.

Claims (1)

25 claims A device for controlling oscillations by aut. St. No. 1068905, characterized in that, in order to increase the reliability of the tests, it is equipped with a first corrective amplifier connected between a periodic signal generator 20 thirty catching and amplitude control, and the second function of the vibrator P. With the introduction of a 5 correction amplifier, such amplifiers are connected, the transfer function between the matching amplifier and such a system takes on a peak value meter. W, (P) KiKv- Wft (P) H-K ,,, W (P) five where k 1KV and K 9KV - the gains of the 1st and 2nd correction amplifiers 2 and 9, respectively. If at the same time in a certain frequency range W (P) -K, 1, then in this frequency range W, (P) t. | . Qif The last relation means that the amplitude-frequency characteristic of the system is linear, i.e. the input and output waveforms will coincide, which increases the availability of JBepHOCTb tests and allows for the reproduction of arbitrary shocks, including those that exist under operating conditions. 0 25 claims A device for controlling oscillations by aut. St. No. 1068905, characterized in that, in order to increase the reliability of the tests, it is equipped with a first corrective amplifier connected between a periodic signal generator