SU1260707A1 - Device for tests and monitoring of mechanism wearing quality - Google Patents

Abstract

A device for testing and controlling nasal mechanisms is related to vibration measuring equipment and can be used for testing and controlling rolling bearings, gears and friction gears of mechanisms. The device may also find application in non-destructive wear monitoring of contiguous mechanisms generating a vibratory signal in the normal operation mode. The purpose of the invention is to increase the accuracy of the device by determining the signals that adjust the controlled band-pass filters in a given analysis band, as well as by quantifying the degree of change of vibroacoustic signals when the mechanisms are worn by comparing the low-key signals of the filters and the sound generator. This goal is achieved in that the device is equipped with a block of detectors of RMS values of a random signal, a block of detectors of average values, a block of comparators, a block of control of switches, a generator of a shum and a switch of a generator of a shuma. I zp f-ly, I ill. (L Gche O5 about o

Description

The invention relates to vibration measuring technology and can be used to test and control rolling bearings, gear and friction gear mechanisms.

The purpose of the invention is to improve the accuracy of the device by determining the signals, drying, improving the settings of controlled band-pass filters in a given analysis band, as well as quantifying the degree of change of vibro-10 acoustic signals when the mechanisms are worn by comparing the signals of the tuning filter and noise generator.

The drawing shows a block diagram of a device for testing and controlling the wear of mechanisms.

The device contains serially connected transducer 1 of vibration of the mechanism into electrical signals, a low-pass filter 2, a block of 3 controlled band-pass filters, a block of 4 detectors of average quadratic values of a random signal, a block of 5 averages detectors, a block of b switches, a summing amplifier 7, an indicator 8, a block 9 of large-scale amplifiers connected by its output to an inlet, so that together they comprise the entire spectrum of the low-pass filter 2 and the noise generator 14. From the second outputs of each of the controlled bandpass filters of the block 3 of the controlled bandpass filters, at the first moment when the filters have not been adjusted yet, signals whose amplitudes are arbitrary are fed to the inputs of the block 4 of the detectors of the rms values of the random signal. At the outputs of block 4 of detectors of mean square values, signals appear, expressing the values of mean square deviations and arriving at the inputs of block 5 of detectors of mean values. From the first and second outputs of the average detector unit 5, the rectified signals arrive respectively at the first inputs of the comparator unit 10 and at the second inputs of the switch unit 6, and signals from the output unit 11 of the comparators are received at the second inputs of the comparator unit 10. The tuning signal supplied by the operator to the inputs of the comparator setting blocks 11 and the comparator control block 12 sets up each of the controlled bandpass signals.

control unit 3 controlled bandpass filter 25 filters block 3 controlled bandpass

a ditch, a comparator unit 10 connected by its output to the input of a block 9 of large-scale amplifiers, a comparator setting unit 11, the output of which is connected to the input of a comparator unit 10, a control filter unit 12, and evaluating the results of this tuning by indicators on indicator 8. . The switch control unit 12 supplies a signal to one of the second inputs.

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switches, generator switch 13 of switch block 6 and connects it to noise, whose input is connected to the output of switch control block 12, and output to the input of summing amplifier 7, noise generator 14, whose output is connected to switch input of noise generator 13, and tuning signals are supplied to the inputs of the comparator tuning unit 11 and the switch control unit 12.

The device works as follows.

The vibroacoustic signals sensed by the vibration transducer 1 of the mechanism and converted into electrical signals are fed to a low-pass filter 2, where the upper cut-off frequency of the signal corresponding to the spectrum of the oscillator 14 signals is limited.

The CMM follows from the second outputs of the average detector unit 5, starting from the first, to the indicator 8 through the summing amplifier 7 connected in series with them. The current value of the detected RMS signal is compared in the comparator unit 10 with the setpoint coming from the output of the comparator setting unit 11 block 10 comparators. From the output of block 10 of the comparators, a signal is sent to the input of block 9 of large-scale amplifiers, which expresses the difference of this comparison. This signal is amplified and fed to the input of the corresponding controlled band-pass filter of the block 3 of controlled band-pass filters.

The device operates in two modes: to the Operator by the signal of adjustment supplied

to the input of the comparator setting unit 11, changes the setting of the comparator setting unit 11 so that the signal at the output of the detector unit 5 of the rms signal values tends to zero.

setup mode and control mode.

In the tuning mode, with the normal operation of a serviceable mechanism, signals from the output of the mechanism 1 vibration of the mechanism to the input of the low frequency filter 2 receive signals representing a random process.

The low pass filter 2 limits the upper limit of the spectrum of these signals. From the output of the low-pass filter 2, the signals arrive at the information inputs of the band-pass filters of the block 3 of controlled band-pass filters, the number and width of the passband of each of which are chosen so that they together comprise the entire spectrum of the low-pass filter 2 and the noise generator 14. From the second outputs of each of the controlled bandpass filters of the block 3 of the controlled bandpass filters, at the first moment when the filters have not been adjusted yet, signals whose amplitudes are arbitrary are fed to the inputs of the block 4 of the detectors of the rms values of the random signal. At the outputs of block 4 of detectors of mean square values, signals appear, expressing the values of mean square deviations and arriving at the inputs of block 5 of detectors of mean values. From the first and second outputs of the average detector unit 5, the rectified signals arrive respectively at the first inputs of the comparator unit 10 and at the second inputs of the switch unit 6, and signals from the output unit 11 of the comparators are received at the second inputs of the comparator unit 10. The tuning signal supplied by the operator to the inputs of the comparator setting blocks 11 and the comparator control block 12 sets up each of the controlled bandpass signals.

 filter unit 3 controlled bandpass

filters and evaluation of the results of this setting on the basis of indicators on indicator 8. This is done as follows. The switch control unit 12 supplies a signal to one of the second inputs.

unit 6 switches and connects it to

unit 6 switches and connects it to

The CMM follows from the second outputs of the average detector unit 5, starting from the first, to the indicator 8 through the summing amplifier 7 connected in series with them. The current value of the detected RMS signal is compared in the comparator unit 10 with the setpoint coming from the output of the comparator setting unit 11 to the second input block 10 comparators. From the output of block 10 of the comparators, a signal is sent to the input of block 9 of large-scale amplifiers, which expresses the difference of this comparison. This signal is amplified and fed to the input of the corresponding controlled band-pass filter of the block 3 of controlled band-pass filters.

Operator signal settings given by

Operator signal settings given by

to the input of the comparator setting unit 11, changes the setting of the comparator setting unit 11 so that the signal at the output of the detector unit 5 of the rms signal values tends to zero.

In the control mode, the signal supplied by the operator to the input of the switch control unit 12 from its first output to the second input of the switch unit 6 receives signals that the switch unit 6 simultaneously connects all its first inputs to the first outputs of the controlled filter unit 3.

In this state, the block 11 of the comparators setting does not change, and the signals from the second outputs of the block 5 of averages detectors coming to the second inputs of the switch block 6 do not pass through the block b. Simultaneously, the second output of the switch control block 12 does not go to the second the input of the switch of the noise generator 14 is given a signal, which connects the output of the noise generator 14 to the inverting input, summing up, its amplifier 7 through the switch of the noise generator 13. The frequency spectrum of the noise generator 13 is chosen such that it corresponds to the passband spectrum of the low pass filter 2. The direct and inverted inputs of summing amplifier 7, thus, are signals, one of which will be the identification residuals of the frequency spectrum of a dynamic signal of a normally operating mechanism, and the other a pink noise signal of noise generator 14. The difference of these signals is reduced in terms of indicator 8.

In the process of wear of the mechanism, the spectrum of its dynamic signal undergoes changes, leading to the formation of signals of a winding, which arrive at the inputs of the summing amplifier 7 and change the indication of indicator 8.

Claims (2)

1. A device for testing and controlling the wear of mechanisms, comprising a mechanism for converting the vibration of a mechanism into electrical signals and a low-pass filter connected in series with it, a block of controlled band-pass filters, a summing amplifier, and an indicator, characterized in that equipped with a unit of detectors of the rms values of a random signal five five 0 five 0 com detectors, comparators, comparators tuning block, scale amplifiers block, switch block, switch control block, noise generator and noise generator switch, the output of the mechanism's vibration transducer into electrical signals is connected to the indicator through a series of low-pass filter, the control block bandpass filters connected by their signal inputs to the output of the low-pass filter, and the first outputs to the first inputs of the switch box, the output which are connected to the inputs of the summing amplifier, the output of which is connected to the indicator, the second outputs of the controlled bandpass filter block are connected to the inputs of the headband amplifiers block connected in series with the detector of RMS values of the random signal, the block of detectors of average values, the comparator block connected with their first inputs to the first the outputs of the block of detectors of average values, the outputs of the block of scale amplifiers are connected to the control inputs of the block of controlled bandwidth The second outputs of the average detector unit are connected to the second inputs of the switch block, the output of the noise generator is connected via a switch of the noise generator connected in series with its inverting input of the summing amplifier, the first and second outputs of the control block are connected to the second inputs of the switch block and the noise generator switch switches, the outputs of the comparator tuner are connected to the second inputs of the comparators block. 2. The device according to claim 1, characterized in that the controlled bandpass filters are made in the form of digital filters with a transfer function of a conservative link.