RU1793265C - Control signal shaper for electrodynamic vibration test facilities - Google Patents

Abstract

The invention relates to a test technique, namely, a technique for generating control signals for driving electrodynamic vibration stands. Rectangular pulse generator 1 generates pulses of 3 ms duration and 40 ms period. Rectangular pulses are fed to the control input of multiplexer b, when a pulse appears at its controlled input, a signal is taken from its second output, and in the absence of a pulse, a signal is taken from the first input, i.e. background signal attenuated by 5 times. 1 ill.

Description

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The invention relates to a test technique, namely, a technique for generating control signals for driving electrodynamic vibro stands. .-.:;,: .-; .- -.-: --........ -,. - 5

A multifunctional device for vibration testing of structures is known, which generates a close-shaped control signal, consisting of a sweep generator, an optimal film unit. .10 traction, digital voltmeters and phase meters and microcomputer triangular pulse generator, l .. ..-. - :::. .

The disadvantage of this system is its high cost and complexity. ° 15

The closest technical solution, chosen as the prototype, is a device for generating non-stationary random load during dynamic testing of products, containing 20 random signal generators, a modulating signal source made in the form of a generator and Pulses, a modulator in the form of an operational amplifier with a ramp coefficient of 25

  gain. .u .- ::: ..:; ./:: C :: / ..; .T.

The disadvantage of the prototype is the lack of a mode of wavefill filling with a signal Ш CB in the intervals between pulses. percussion),;, l ;; g - -v;: K :: 30

It is an object of the invention to further provide testing under near real conditions by generating an impact load with a background behind. COMPLETION. ;;: ;; .. V:; -; :. - ;;. . .

,; The bidirectional goal is achieved by the fact that in the device for generating a control signal of electrodynamic vibrating screens, comprising a random signal generator, a signal pulse generator with 40

 given shape and sequence

and oscillator, additionally

 . introduced n bandpass filters, adder,

  voltage divider and multiplexer.

Random Signal Generator Output 45

1 is connected to the inputs of a bandpass filter: a ditch, the output of each of which is connected

respectively with each of the inputs of the adder. The output of the adder is connected to a voltage divider, the first and second outputs of which are respectively connected to the I and II inputs of the multiplexer, the output of which is connected to the exciter. The pulse generator of the signal of a given shape and sequence is connected to the control input of the multiplexer.

The drawing shows a block diagram of a device for generating a controlled signal of electrodynamic vibro-walls; ..; /,; -;: ;;:;:.,; .:.,.

The device consists of a random signal generator 1, n bandpass filters 2, a voltage divider 4 adder 3i, a rectangular pulse generator 5, a multiplexer 6, and a vibration exciter 7.

The random signal generator is a noise generator in the entire audio frequency range, a random broadband signal from it is fed to the inputs of 64 narrow-band filters, the bandwidths of which increase with increasing value of the filter tuning frequency. The SW spectrum is formed by the regulators of the output level of the filters in the frequency range 5-2000 Hz, the C signals from the outputs of the filters are fed to 64 inputs of the adder and mixed in it. The formed spectrum is fed to the second input of the multiplexer, the same signal is fed to the first input, but it is attenuated by a factor of 5 through the resistive divider. The generator is pr - moog6l1, n W IM pulses i generates pulses with a duration of 3 ms and a period of 40 ms. Rectangular pulses are applied to the control input of the multiplexer and, when a pulse appears on the control input of the multiplexer, the signal 6 of the second input is taken from the output of the multiplexer, and in the absence of a pulse, the signal from the first input, i.e. Attenuation background signal at a time.

Efficiency technology is determined by the ability not to conduct tests on a real object, but only in laboratory conditions, which gives a saving of 20 thousand rubles. at one test site compared to the prototype selected for the base object.

Claims (1)

The claims c at A device for generating a control signal of electrodynamic vibroend, containing a random lignal generator, a signal pulse generator with this shape and sequence, and an oscillator, characterized in that, in order to achieve the possibility of testing under conditions that are close to real, by excitement Shock loading with background filling, it is equipped with serially connected n-band filters, an adder, a voltage divider and a multiplexer, the output of the random signal generator is connected to the inputs of the filter filter, the output of the multiplexers is connected to the exciter, the pulse generator of a given shape and sequence connected to the control input of the multiplexer.