SU1557548A2 - Device for controlling oscillations - Google Patents

Abstract

The invention is intended for testing products for impulse loads and is an improvement of the device according to the author. N 1233118. The purpose of the invention is to expand the field of application by allowing the formation of a sequence of alternating different polarity series of pulses. For this, the device is equipped with a digital comparator unit and an OR element. 1 hp f-ly, 2 ill.

Description

The invention relates to a test apparatus for testing products for impulse loads.

The purpose of the invention is to expand the field of application by allowing the formation of a sequence of alternating ir-polar series of pulses.

FIG. 1 shows a block diagram of the device; in fig. 2 - The digital block comparison circuit is functional.

The device for controlling oscillations contains a series-connected periodic signal generator 1, amplitude regulator 2, key 3, power amplifier 4, vibrator 5, vibrator 6, matching amplifier 7, peak value meter 8, memory block 9, comparison unit 10, driver 11 rectangular signals, inverter 12, pulse counter 13, first differentiating block 14, element 15, triggers 16 and 17, second differential block 18, pulse number setting device 19, third differential block 20, third trigger 21, second element nt and 22, a second inverter 23, second key 24, a digital comparator unit 25, an OR gate 26, bus 27 Start input 28, control input 29 and output 30, digital unit 25.

Block 25 contains a counter 31, a digital comparator 32, setting units 33 and 34 of the number of positive and negative polarity pulses, respectively, the switch 35 and the delay elements 36 and 37.

The device works as follows.

The generator 1 of periodic signals generates a sinusoidal voltage at the output, which through the regulator 2 amplitude enters

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the inputs of the key 3 and the former 11 rectangular signals. The positive half-waves of the signal shaper 11 are converted into square pulses. After differentiation by the first differentiating unit 14, short pulses are supplied to one input of the element I 15, the temporary position of which corresponds to the leading edges of the pulses of the imaging unit 11,

At the same time, after passing through the inverter 12 and the differentiating unit 13, positive short pulses are received at the zero input of the trigger 17, the temporary position of which corresponds to the rear edges of the pulses of the driver 11.

The signal from the output of the latter is also fed to the input of the counter 13, operating in the divider mode, which determines the pause between the output pulses. The pulse from the output of the counter 13 sets the trigger 1G to a single state, so the next pulse from the output of the differentiating unit 14 after passing through the element 15 sets the trigger 17 to a single state, and the key 3 is opened, and when the trigger 21 is set to one the signal from the output of the element And 22 enters the control input of the key 24, opening it. The signal from the output of the periodic signal generator 1 is fed through the amplitude regulator 2 and the serially connected keys 3 and 24 and the power amplifier 4 to the moving coil of the vibrator 5.

At the same time, the signal from the output of the trigger 17 is fed to the input of the memory block 9 and prepares it for measuring the output signal of the vibrator 5.

The signal from the output of the vibration converter 6, installed on the platform of the vibrator 5, through the matching amplifier 7 and the peak meter 8 is fed to the input of the memory block 9, which fixes the maximum signal value, which is compared to the reference value in the comparison block 10 and is applied to the control input of the amplitude regulator 2, adjusting the amplitude of the pulses to the required value,

At the moment of termination of the pulse from the output of the imaging unit 11, an impulse arrives at the reset input of the trigger 17 from the output of the differential signal.

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bringing the trigger 17 into the initial zero state, the key 3 and the memory block 9 are disconnected, and through the differentiating block 20 the trigger 16 is set to the zero state.

In accordance with the state of the flip-flop 21 (single or zero), the signal from the output of the key 3 is fed to the input of the amplifier 4, power, respectively, via the key 24 or through the inverter 23. In this case, the input signals of the moving coil of the vibrator 5 receive pulse signals of positive or negative polarity, respectively .

The next signal from the output of the regulator 2 amplitude is fed to the input of the amplifier 4 power at a time interval equal to the pause between pulses, determined by the state of the counter 13.

The polarity of the next signal is determined by the state of flip-flop 21. When the signal arrives at the Start 27 bus, the flip-flop 21 is set via the OR 26 element to one state. In this case, a single signal is fed to the control input of the switch 35, the outputs of which contain signals determined by the contents of the setpoint 33, which determines the number of excitation pulses of the vibrator of positive polarity.

When the trigger 17 is set to a single state, from the output of the differentiating unit 20 to the input 28 of the counter 31 short pulses are received, the temporary position of which corresponds to the leading edges of the pulses at the output of the trigger 17, the temporary position of the latter corresponds to the temporary position of the vibrator excitation pulses.

Each pulse arriving at the counting input of the pulse counter 31, from the output of the differentiating unit 20, also directly flows through the delay element 36 to the digital comparator 32 of the block 25. When the contents of the counter 31 and the setting device 33 are equal, the output of the comparator 32 appears output30, and therefore, the inputs of the trigger 21 directly, and the input Reset counter 31 through delay element 37.

In this case, the trigger 21 is set to the zero state, and the zero state

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the signal from the single output of the trigger 21 sets the switch 35 to a position at which signals appear at its outputs corresponding to the signals at the outputs of the setter 34.

Since the trigger 2) is now set to the null state, the key 24 is open, and when the trigger 17 is set to one, the signal from the output of the key 3 is fed to the input of the power amplifier 4 through the inverter 23.

Thus, a series of excitation pulses of a negative vibrator is generated, and the duration of the series (the number of pulses in a series) is determined by the contents of the setter 34,

With the equal content of the counter 31 and the setting device 34, a pulse is formed at the output of the comparator 32, which sets the counter 31 to zero and enters the trigger 21, sets it to one state and prepares the device for generating a series of positive-polarity vibrator excitation pulses.

Thus, pulsed signals of alternating polarity are fed to the input of the moving coil of the vibrator 5.

The unit 19 of the number of pulses counts the number of pulses reproduced by the vibrator 5, and when the required number of pulses is reached, the counter of 13 pulses stops.

Claims (2)

The proposed device has the ability to reproduce a sequence of alternating different-field series of pulses to excite the vibrator, which expands its scope. Invention Formula I, Device for controlling oscillations according to the author, no. 1233118, о т 0 five 6 This is due to the fact that, in order to expand the field of application by ensuring the formation of a psgle of alternating different polarity of pulse series, in Hei the output of the third differentiating unit is connected to the first input of the third grinder through the additional input serially connected digital comparison unit and an OR element, the second input of the AND element connected to the Start bus, the second input of the third trigger to the first input of the OR element, and the output of the third trigger to the control input of the digital comparison unit. 0 five 0 five 0 2. The device according to claim 2, wherein the digital comparison unit comprises an infrared counter, a digital comparator, two delay elements, a switch, a generator of the number of positive polarity pulses and a generator of the number of negative polarity pulses connected to the outputs of the first group of inputs of the switch, the second the input group of which is connected to the corresponding outputs of the setting unit for the number of pulses of positive polarity, and the switch outputs are connected to the first group of inputs of the digital comparator connected by the second input group to the corresponding outputs of the counter, controlling the input via the first delay element to the counting input of the counter, and the output via the second delay element to the reset input of the counter, the counting input of the counter being the block input, the control input of the switch being the control input of the block, and the output counter - block output. ,, / 7t / r Compiled by V.Pritsin. Editor L.Veselovska Tehred M.DidykKorrektor E.Lonchakova Order 717 Circulation 642 VNISTI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 fig 2 Subscription