SU1654791A2 - Mechanical oscillation regulator - Google Patents

Abstract

The invention relates to a test technique, is intended to test products for impulse loads, and is an improvement on the known condition of a. with. No. 1283720. The purpose of the invention is an EZ-H NC extension of functionality by enabling the generation of a sequence of pulsed signals with a follow-up period determined by a random law of distribution. , the comparison unit 35 and the pulse shaper 36 which, in addition to a sequence with a fixedly fixed follow-up period, generate a pulse sequences with a repetition period varying at random which allows expand Putting application device 2 yl 3el 18 is

Description

The invention relates to a testing technique, is intended for testing products for impulse loads, and is an improvement of the device according to the authors. St. No. 1283720.

The purpose of the invention is to enhance the functionality by allowing the formation of a sequence of pulsed signals with a follow-up period determined by the random distribution law.

FIG. 1 shows a block diagram of the device; in fig. 2 - diagrams on the operation of the device.

The device for controlling oscillations comprises a periodic signal generator 1, an amplitude regulator 2, a key element 3, a power amplifier 4, a vibrator 5, a vibrator 6, a matching amplifier 7, a peak value meter 8, a memory block 9, a comparison block 10, a driver 11 coal pulses, inverter 12, counter 13 pulses, differentiating blocks 14-16, elements AND 17, 18, element AND 19, element OR 20, element 21 delay, triggers 22 and 23, unit setting 24 number of pulses, subtractor 25, source 26 adjustable support voltage will increase l 27, program controller 28, a trigger 29, a block 30 the key elements, a digital to analog converter 31, a switch 32, a noise generator 33, a selective amplifier 34, the comparison unit 35, pulse shaper 36, the mode dial 37.

The device works as follows.

The generator 1 of periodic signals produces signals of various shapes (sinusoidal, trapezoidal, triangular). FIG. Figure 2 shows the voltage plots in the reproduction of pulses with a vibrator corresponding to the half-period shape of a sinusoidal voltage. The periodic signal (Fig. 2a) is converted into rectangular pulses (Fig. 26) by the rectangular pulse generator 11. At the output of the differentiating unit 14, positive pulses are formed (Fig. 2c), corresponding to the leading edges of the pulses of the former 11. At the output of the differentiating block 15, positive pulses are formed (Fig. 2d), which correspond to the leading edges of the pulses of the former 11,

The first pulse from the output of the shaper 11 through the element 21 is fed to the input of the counter 13 (Fig. 2c), as well as through the elements AND 18, OR 20 to the first input

trigger 22, setting it to a single state (Fig. 2e). The potential at the output of the element 19 is shown in FIG. 2d The output signal of the trigger 22 is fed to the input of the key element 3, and the first pulse from the output of the generator 1 is fed through the amplifier 4 into the moving coil of the vibrator 5. At the same time, the signal from the output of the trigger 22 is fed to the input of the memory block 9 and

0 prepares it for measuring the output signal of the vibrator 5, the signal from the output of the vibrator 6, installed on the test object (not shown), through the matching amplifier 7 and the meter 8 pic values goes to the memory block 9, where the voltage corresponding to the maximum value is stored signal. This voltage at the moment of pause is compared with the reference in block 10 and is applied to

0 control input of the amplitude regulator 2, adjusting the amplitude of the pulses to the desired value.

At the time of the end of the pulses to the second input (reset input) of the trigger 22 from the output

5 of the differentiating unit 15, an impulse arrives that sets the trigger 22 to its initial position. In this case, the key element 3 and the memory unit 9 are disabled, and through the third differentiating unit 16

0 confirms zero trigger state 23.

Upon receipt of the first and subsequent pulses from the output of the generator 1 at the output of the element And 19 installed

5 is zero, and the pulses from the output of block 14 through the AND 18 element do not pass, and the pulses from the output of block 14 pass through the element AND 17 only in the single state of the trigger 23 (Fig. 2i). This trigger sets 0 s to one state when an overflow pulse appears at the output of the counter 13 (Fig. 2c). The output signal of the trigger 23 goes to the second input of the element 17. 17. Therefore, when the next pulse 5 appears at the output of the differentiating unit 14, this pulse passes through the elements AND 17 and OR 20 to the input of the trigger 22, setting it to one state (Fig. 2k). The key element 3 is then opened, and the signal from the output of the generator 1 is fed again through the amplifier 4 to the moving coil of the vibrator 5.

At the same time, the signal from the output of the trigger 22 is fed to the input of the memory block 9 for

5 storing the maximum value of the voltage from the output of the vibration converter 6. At the moment of termination of the pulse of the shaper 11, a pulse arrives at the reset input of the trigger 22 from the output of the differentiating unit 15, which sets the trigger 22 to its initial position. At the same time, a pulse through the differentiating unit 16 (Fig. 2m) sets the trigger 23 to the initial state (Fig. 2k).

Unit 24 counts the number of pulses entering the vibrator winding, and when the required number of pulses is reached, the counter 13 stops, thereby stopping the arrival of periodic signals to the vibrator winding 5. The sequence of signals input to the vibrator 5 winding is shown in FIG. 2a, when the signal from the output of the adjustable voltage reference source 26 is equal to zero.

The sequence of pulses entering the winding of the vibrator 5 in the presence of a reference voltage level is shown in FIG. 2 p, p. A change in the gain of the amplifier 27 in proportion to an increase in the reference voltage allows the maximum value of the signal to be kept constant as the duration of the generated periodic pulses changes. The trigger 23 is set to one when an overflow pulse appears at the output of the pulse counter 13 in a periodic signal sequence mode or a pulse from the output of the pulse former 36 in a random signal sequence mode. When the trigger 29 is set to one, the group of keys of the block 30 is closed and a step-increasing voltage is applied at the output of the digital-to-analog converter 31 to the second input of the comparator 35, the first input of which receives a random voltage from the output of the selective amplifier 34. Shape The output of amplifier 34 is determined by the bandwidth of the amplifier and the average frequency over the frequency range.

At the moment of comparing the signals arriving at the inputs of the unit 35, a signal is generated at its output, and at the output of the imaging unit 36 a pulse arriving through the switch 32 to the reset input of the counter 13, confirming its zero state, and

to the input of the trigger 23, set it to one. When the trigger 29 is set to the zero state, the group of key elements of the block 30 appears

in the open state, and the first input of the switch 32 is connected to its output. When the trigger 29 is set to one, the group of keys of the block 30 is closed, and the second input of the switch

32 is connected to its output.

Thus, the device has a wider field of application, due to the possibility of forming, along with a periodic sequence of pulse signals, to excite the vibrator, also a sequence of pulses, the formation times of which are distributed according to a random distribution law.

Claims (1)

Claims of the invention A device for controlling oscillations according to the authors. St. No. 1283720. characterized in that, in order to extend the functionality by ensuring the formation of a sequence of pulsed signals with a follow-up period determined by a random distribution law, a block of key elements, digital-to-analog converter, switch, serially connected mode controller and third trigger and serially connected noise generator, selective amplifier, second block comparing and pulse shaper, with the pulse counter output connected to the first input of the second trigger via a switch whose output is connected to the pulse counter reset input, the second information input to the pulse driver output, and the control input to the third trigger output and control input block of key elements connected by a group of inputs to corresponding outputs of the pulse counter, and a group of outputs to the corresponding inputs of a digital-to-analog converter connected to the second input of the second comparison unit. BtaCvtt Output, Tr23 Rig.2