SU1474495A1 - Device for exciting shock pulses - Google Patents

Abstract

The device contains a series-connected power source, charge key, capacitor bank, first and second bit switches, first and second elements OR, electromechanical exciter with a vibration measuring transducer mounted on its moving part, a control unit made in the form of elements NOT . The device is equipped with an And element, a sign-sensitive element, a first and second amplifiers with adjustable gain factors, first and second differentiating units, an adder, an adjustable threshold element, a peak voltage meter and a regulator. 1 il.

Description

The invention relates to a testing technique, in particular, to devices for driving shock pulses during dynamic testing of products.

The purpose of the invention is to improve the accuracy of testing when using an electromechanical energizer with an electric damping circuit by eliminating the effect of alternating accelerations on the test object after the end of the main shock pulse.

The drawing shows a structural diagram of the proposed device for the initiation of shock pulses.

The device contains a power source 1, a battery of 2 capacitors, an electromechanical energizer 3, a vibration measuring transducer 4, a phase sensitive element 5, a phase inverter 6, a charging switch 7, the first 8 and the second 9 bits, the first 12 and second 13 elements OR, start block 14, element 15, sign-sensitive element 16, first 17 and second 18 amplifiers with controllable gain factors, first 19 and second 20 differentiating units, adder 21, adjustable threshold element 22, meter 23 peak voltage regulator and Z4, the phase-sensitive element 5 performs a correlation phase electrical snubber circuit signal. Keys 7-9 are in the conducting state only when there is a signal on their control inputs. The start-up unit 14 may be made in the form of a switching key and a source of reference voltage, or it may be a pulse generator. The key must be in a wired state or the pulse generator pulse duration must be not less than the response time of the key. 8 - element NOT 10- element NOT 11 is an OR element. 13. At the output of the sensing element 16, the signal occurs when a negative signal is output from the differentiation unit 20.

At the output of the adjustable threshold element 22, the signal occurs when the value of its input signal is less than a predetermined adjustable threshold value. The threshold of element 22 is proportional

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The magnitude of the signal at its control input, the gains of amplifiers 18 and 19 are proportional to the magnitudes of the signals at the control inputs. At the outputs of the regulator 24, the magnitudes of the signals are proportional to the signal at the output of the meter 23 peak voltages.

The output of the power source 1 is connected via a charging switch 7 to the input of the battery 2 of capacitors, the output of which is connected via the first bit 8 to the first input of the first cell OR 12, the second input of which is connected to the output of the second bit 9, the control input of which is connected To the output of the element 15, one input of which is connected to the output of the first bit switch 8 through the serially connected differentiating unit 20 and the sensing element 16, and the other input to the elements 15 connected to the output of the adjustable threshold el 22, the input of which is connected to the output of the first bit switch 8, combined with the input of the first element NO 10, the output of which is connected to the control input of the charge switch 7 directly, and to the control input of the first bit switch 8 via the second connected key the element is NOT 11 and the second element is OR 13, to the second input of which the output of the starting unit 14 is connected. The output of the first element 12 OR is connected to the input of the electromechanical energizer 3, the signal input of the second bit switch 9 is connected to the output of the adder 21, the first input of which is connected to the output of the vibration measuring transducer 4 installed on the moving part of the electromechanical energizer 3, through series-connected phase-sensitive element 5, phase inverter 6 and the first amplifier 17, and the second input of the adder 21 is connected to the output of the phase inverter 6 through the first differential connected in series block 19 and the second amplifier 18.

The input of the meter 23 peak voltages is connected to the output of the first bit switch 8, and the output of the meter 23 peak voltages is connected to the control input of the regulator 24, the outputs of which are connected to the control box.

the inputs of the amplifiers 17 and 18 of the threshold element 22 "

A device for exciting shock pulses operates as follows.

In the initial state, the start block 14 is disabled, at the output of the element NOT 10 there is a signal, the key 7 is closed,

through the phase-sensitive element 5 and the phase inverter 6 is fed to the inputs of amplifiers 17 and 18, from the output of which through the adder 21 is fed to the input of the switch -9. The closure of the key 9 leads to the formation of a closed loop negative feedback and damping oscillations of the moving part

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and key 8 is open. The battery 2 of the conden-JQ of the electromechanical energizers is charged (charged) from the power source 1. When the start-up unit 14 is turned on, the key 8 closes and a current pulse is applied to the winding of the movable part of the fork-body 3 due to the discharge of the battery 2 of capacitors. At the same time, the output of the element NOT 10 does not have a signal, the key 7 opens, and the closed state of the key 8 (even if there is no signal from the output of the trigger unit 14) is due to the presence of a signal at the output of the element 11 and therefore the output of the element OR 13. At when the voltage on the battery 2 of the capacitors reaches the threshold of the threshold element 22 on the second element 15, there is a signal. At the first input of the element 15, the signal occurs when a negative signal is output from the second differentiating unit 20, and at the output of the element 15 the signal.

At the same time, when the voltage on the battery 2 of the capacitors reaches the threshold of the element NOT 10, i.e. after the passage of the main shock current pulse, the output of the element NOT 10 has a signal, the key 7 closes, and the key 8 opens. The output of the power source 1 is connected to the input of the battery 2 of the capacitors and its charge starts again, and the discharge circuit is blocked by the open state of the key 8.

Since the key 9 is closed, when the moving part of the electromechanical energizer 3 deviates from the stable equilibrium position even during the passage of the main shock current pulse due to the discharge of the capacitor battery 2, the signal from the output of the vibration measuring transducer 4 after passing

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Into the winding of the moving part, the force of the wake 3 is supplied with an inverted voltage proportional to the displacement of the moving part of the exciter 3, as well as an inverted voltage proportional to the moving speed of the moving part of the energizer 3. The first component creates a force preventing the moving part from deviating from its equilibrium position . The second component changes the character of the movement of the moving part of the electromechanical power unit of the engine, making it aperiodic.

Depending on the increase (decrease) in the amplitude value of the main shock pulse, the output signal of the peak voltage meter 23 increases (decreases), and hence the signal on the control code of the controller 24. Thus, the threshold threshold of the adjustable threshold unit increases (decreases). 22 and gains

35 amplifiers 17 and 18. Thus, the oscillatory nature of the transition process is excluded for any deviations of the moving part of the electromechanical force driver by Amax.

Switching on the damping electric circuit before the end of the formation of the main shock pulse and the formation of a negative feedback signal from two components, one of which is proportional to the displacement, and the other of the speed of the moving part of the power driver, results in the absence of alternating force effects (after the end of the main successful pulse) on the test object, and this leads to increased durability of the device and increase the reliability of test results.

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Q electromechanical force

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An inverted voltage proportional to the displacement of the movable part of the exciter 3 is supplied to the winding of the moving part of the energizer 3, as well as an inverted voltage proportional to the speed of movement of the movable part of the energizer 3. The first component creates a force preventing the mobile part from deviating from the equilibrium position. The second component changes the movement pattern of the moving part of the electromechanical power driver, making it aperiodic.

Depending on the increase (decrease) in the amplitude value of the main shock pulse, the signal at the output of the peak voltage meter 23 increases (decreases), and hence the signal on the control code of the controller 24. Thus, the trigger threshold of the adjustable threshold unit 22 increases proportionally (decreases) and gains

5 amplifiers 17 and 18. Thus, the oscillatory nature of the transient process is excluded for any deviations of the moving part of the electromechanical force driver by Amax.

Switching on the damping electric circuit until the end of the formation of the main shock pulse and the formation of a negative feedback signal from two components, one of which is proportional to the displacement, and the other of the speed of the moving part of the power driver, results in the absence of alternating force effects (after the end of the main shock pulse) on the test object, and this leads to increased durability of the device and increase the reliability of test results.

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Editor I. Derbak

Tehred M. Didyk

Order 1884/39 Circulation 788 Subscription

VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5

Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101

Proofreader S. Shekmar

Claims (1)

DEVICE FOR EXCITING SHOCK IMPULSES, containing a power source, a charging key, a capacitor bank, a first discharge key, a first OR element, an electromechanical exciter with a vibration measuring transducer mounted on its movable part, a start-up block, a control element made in the form of a NOT element, an output which is connected directly to the control input of the charging key, and to the control input of the first discharge key through the second element connected in series there is NOT a second OR element, the second input of which is connected to the output of the start-up unit, and an electric damping circuit including a phase-sensitive element connected in series, the input of which is connected to the output of the vibration transducer, a phase inverter and a second bit switch, the output of which is connected to the second input of the first OR element , otlichayuschee- ¹ I that, in order to increase the accuracy of the test by eliminating steps in the test object alternating accelerations after the main shock pulse of but equipped with an And element, a sign-sensitive element, first and second amplifiers with adjustable gain, the first and second differentiating units, an adder, an adjustable threshold element, a peak voltage meter and a regulator, and the output of the adder connected to the signal input of the second bit switch, the first input of which is connected to the phase inverter output through the first amplifier with an adjustable gain, and the second input to the phase inverter output through the first a differentiating unit and a second amplifier with an adjustable gain, the control input of the second bit key is connected to the output of the And element, the first input of which is connected to the output of the first bit key through a second differentiating unit and a character-sensitive element connected in series, and the second input through an adjustable threshold element, which controls the input of the regulator is connected to the output of the first bit key through a peak voltage meter, and the control inputs of the first and second amplifiers are adjustable m and gain adjustment threshold element connected to the outputs of the controller. SU 1474495 A1