SU602806A1 - Device for testing articles for random oscillation - Google Patents

Description

This is due to the fact that it does not contain the means of mixing in one cycle of testing the stresses of the program in accordance with the article 1 characteristics of the simulated vibrations.

The aim of the invention is to simulate nesting (cunar random vibrations and reducing test times.

This goal is achieved by the fact that the device is equipped with an intermediate memory block and a switch that serves to connect the analyzer: the spectrum to the output of the intermediate memory block and the program master inputs, executed as a statistical processing unit of an ensemble of realizations of natural random vibrations with a memory element, or output amplifier and the second inputs of the comparators.

The drawing shows a block diagram of the described device.

The device is a multichannel closed loop control system. In the direct circuit of the system, the program setpoint 1 is made in the form of a statistical block, processing ensembles of regressions of natural random vibrations with a memory element, parallel channels connected to it, each of which contains a comparator 2, a regulator 3 and a sinusoidal generator 4 , an adder 5, to which all generators 4 are connected, a power amplifier 6 and a vibrator 7 on which the test article 8 is mounted.

The feedback circuit includes a vibration measuring transducer 9 with an amplifier 10 and an analyzer AND parallel spectrum, made in the form of a set of band-pass filters 12. The device also contains an intermediate memory unit 13, which uses a tape recorder, and a switch 14, which in position a connects analyzer 11 to the output of block 13 of the intermediate memory and inputs of the setpoint 1 of the program, and in position b connects the analyzer 11 to the output of the amplifier 10 and the second inputs of the comparators 2 ..

The device operates in two modes: in the mode of determining the parameters of the imitating signal and in the mode of reproducing the imitating signal. /

In the first mode, the switch 14 is set to position a. At the same time, separate implementations of natural random vibrations recorded on the magnetic tape of the block 13 are successively reproduced by him, and the reproduced signals are fed to the input of the analyzer P. Signals from the output of the analyzers, determined by the time-varying amplitudes of the harmonic components of each implementation, go to the corresponding inputs master 1 of the program, in which the memorization and summation of the results of the harmonic analysis of realizations of simulated vibrations as they arrive and dividing e obtained by the number of implementations.

Thus, in the memory element of the setting device 1, the time-averaged amplitudes of the amplitudes of the harmonic components of simulated random vibrations are stored along the ensemble, which are also the laws of the time variations of the amplitudes of the harmonic signals of the generators 4.

In the second mode, the switch 14 is set to b. This is where the signals from the outputs of the setting device 1 are fed to the inputs of the comparators 2. To the second inputs of the comparators 2, they output signals from the outputs of the analyzer 11.

The error signals from the outputs of the Comparators 2 are fed to the inputs of the regulators 3, which form the control signals necessary to control the amplitudes of the individual harmonic components at the outputs of the generators 4, the output signals of which are summed in the adder 5. The synthesized signal of a complex form thus generated through the amplifier 6 power is supplied to the vibrator 7. The vibration parameters at a given point of the test article 8 with unknown dynamic characteristics are measured by a vibration measuring transducer. ers 9, the output of which through the amplifier 10 to the input of the analyzer 11 and for recording on the block 13 of the intermediate memory.

The reduction in test time achieved with the use of the invention and the ability to simulate non-stationary random vibrations reduce the cost of testing and increase their reliability.

Claims (2)

Invention Formula A device for testing products for random vibrations, containing a multi-channel closed-loop control system, the straight circuit of which includes a program master, parallel channels connected to it with a comparator, a regulator and a sinusoidal generator in each channel, a summator, a power amplifier and a vibrator, and a feedback circuit It includes a vibration measuring transducer with an amplifier and a spectrum analyzer of parallel action, the outputs of which are connected to the second inputs of the comparators, characterized in that, for the purpose, an imitation and non-stationary random vibrations and reducing test time, it is equipped with an intermediate memory unit and a switch that connects the spectrum analyzer to the output of the intermediate memory unit and the program setter inputs, performed as a statistical processing unit of an ensemble of realizations of natural random vibrations with memory elements or to the output of the amplifier and the second inputs of the comparators. Sources of information taken into account During the examination: 1. US patent N 3.015,949, class 73-71.5, 1962. 2. Abramovich S.V. et al. A nite-test control system with polyharmic power excitation imitating a random process, Cybernetics and Computing Technology, Kiev, Naukova Dumka, 1974, vol. 23. ).