SU898276A1 - Device for analysis of rolling-contact bearing vibrations - Google Patents

Description

(54) DEVICE FOR ANALYSIS OF VIBRATIONS OF ROLLING BEARINGS

The invention relates to the bearing industry and can be advantageously used in the vibration diagnosis of rolling bearings.

A device for measuring bearing vibrations is known, comprising a serially connected control unit, a level adjuster, a first comparison unit, a counter for the number of exceedances, and also an average value measuring unit, a recording and display unit 1.

However, the known device has a low quality control of bearings by vibration.

The aim of the invention is to improve the quality of vibration diagnostics of bearings.

This goal is achieved due to the fact that the device contains a series-connected control unit, a level adjuster, a first one, a comparison unit, a counter of the number of exceedances, as well as an average value measurement unit, a recording and display unit. It is equipped with series-connected differentiation unit, second comparison unit, logical multiplication unit, and

the measurement of the duration of the excess, the memory unit, as well as the probability density measurement unit, the measurement unit of the absence duration, while the output of the logic multiplication unit is connected to the first inputs of the absence duration measurement unit and the probability density measurement unit, the outputs of which are connected to the second and third the inputs of the memory block, to the fourth input of which the second output of the control unit is connected, to the top - the output of the measuring unit of the average value and

15 to the sixth — a counter of the number of exceedances; the output of the memory unit is connected to the first input of the recording and display unit; the second output of the control unit is connected to the second inputs.

20 counter of the number of exceedances and the recording and display unit, the output of the first comparison unit is connected to the second inputs of the measuring units of the duration of the exceeding and measuring

25 of the absence duration, the second inputs of the first and second comparison units, the probability density measurement unit, the average value measurement unit and the input of the differentiation unit are combined and are input

the device, and the third output of the control unit is connected to the third input of the probability density measurement unit.

FIG. 1 shows a block diagram of the device; in fig. 2-4 timing charts of devices

The device contains a serially connected control unit 1 level adjuster 2, a first comparison unit 3, a counter 4 for the number of exceedances, as well as an average value measurement unit 5, an absence duration measurement unit 6, a probability density measurement unit 7 and a series differentiation unit 8, a second unit Comparison 9, two-input logical multiplication unit 10, unit for measuring the duration of exceeding, unit 12 of memory, unit 13 of registration and indication. The output of logical multiplication unit 10 is connected to the first inputs of the absence duration measurement unit 6 and the density measurement unit 7, the outputs of which are connected to the second and third inputs of the memory unit 12, to the fourth input of which the second output of the control unit 1 is connected to the fifth - output the average value measurement unit 5, to the sixth, the output of the counter 4, the number of exceedances, and the output of the memory unit 12 are connected to the first input of the recording and display unit 13, the second output of the control unit 1 is connected to the second inputs of the counter 4 numbers and the elevations of the registration and indication unit 13, the output of the first comparison unit 3 is connected to the second inputs of the duration measurement blocks exceeding 11 and the absence duration measurement b, while the second inputs of the first comparison unit 3, the second comparison unit 9, probability density measurement unit 7, The average value measurement unit 5 and the input of the differentiation unit 8 are combined and are the device input, and the third output of the control unit 1 is connected to the third input of the probability density measurement unit 7.

The device works as follows.

The analyzed signal x (t) is fed to the second inputs of comparator blocks 9 and 3, as well as to the input of differentiation unit 8, to the second input of probability probability measurement unit 7 and the input of average value measurement unit 5. In comparison block 9, the operations of comparing the values of the input signal and its derivative with the given values are performed, as a result of which functions are formed for signs; yQ sign x sign of the signal and its derivative {FIG. 3). These signals in the logical multiplication block 10 are converted into a function

The VU is sign x.sign x, which is used (it is used to measure time intervals t f, (x) exceeding, time intervals T (x) and the probability of unreliability p (x) at each of the specified signal levels

(t); Xp, X | 3i, ...,, ..., X (jp,

where n is the specified number of sampling intervals by signal level. The measurement of the intervals Tn (x) and tTj (x) is carried out respectively in blocks.

11 and 7, to the second inputs of which the function arrives, which is obtained in block 3 comparison by the algorithm

Od O at X (t) X;.,

for 1 with x (t) 5 XQ. .

In block 7, the probability density measurements from the signals from block 1 of the control and function y ,. sign x-sign from the logical multiplication unit 10, a probability density measurement p (x) of the signal x (t) at each of the predetermined levels x is measured by one of the known methods.

Intermediate and final measurement results t (x), t; p, (x) and p (x) from blocks 4–7 and 11 enter the block

12, from which they can be submitted to the recording and display unit 13 to make a decision on the measurement results. The operation of blocks 5.7, 12 and 13 is carried out using signals from control unit 1.

Thus, analyzing the signals of vibration of rolling bearings by the proposed device, which allows to take into account the frequency properties of the signal, it is possible to increase the degree of objectivity and reliability of determining the type of defect, and hence the quality of control.

Claims (1)

1. Mei mator elee 1976, t. 59 / p. 320-321.