SU934235A2 - Analyzer of vibration spectrum of rotating articles - Google Patents

Description

one

The invention relates to vibration measuring technology and can be used for vibro-acoustic diagnostics of parts and assemblies of power plants.

According to the main author. St. No. 838401 is a known analyzer of the vibration spectrum of rotating parts used for vibroacoustic diagnostics of parts and assemblies of power plants, comprising a frequency transfer generator, vibration and speed sensors and two circuits connected to the vibration and speed sensors, respectively, the first of which includes series-connected measuring unit and unit registration, the second includes a serially connected driver, the first divider, a frequency converter connected in parallel along the inputs and a phase detector, mmator, controlled oscillator, frequency mixer, a second input connected to a frequency transfer generator, a filter, second and third dividers, the output of one of which is connected to the second input of the phase detector, and the second input of the measuring unit connected to the output of the controlled oscillator, serially connected a converter and a comparison unit, two period meters parallelly connected to the inputs and connected to the output of the first divider, and the outputs to the first and third inputs of the comparison unit, a synchronizer, passages connected to the inputs of gauges period and comparing unit, and an output of temporary transducer connected to the input 1 of the adder.

The disadvantage of the known analyzer is that using it takes considerable time to determine

10 of the technical condition of the part, since it does not allow the measurement of the phase of the harmonic components.

The purpose of the invention is to increase the productivity of the control.

This goal is achieved by the fact that the vibration spectrum analyzer of rotating parts is equipped with additional serially connected first and second frequency multipliers, the input of the first one is connected to the output of the first divider, measuring unit and phase meter, the last of which are connected by the second inputs respectively to the outputs of the controlled generator and the main unit of measurement. The drawing shows a block diagram of a vibration spectrum analyzer of rotating parts. The vibration spectrum analyzer contains a frequency transfer generator 1, vibration and speed sensors 2 and 3 and two circuits connected to vibration and speed sensors 2 and 3, respectively, the first of which includes series-connected measurement unit 4 and recording unit 5, the second includes sequentially connected driver b, the first divider 7, the frequency converter 8 and the phase detector 9, the adder 10, the controlled generator 11, the frequency mixer 12, the second input connected to the generator 1 transferred in parallel across the inputs But the frequencies, filter 13, second and third dividers 14 and 15, the output of one of which is connected to the second input of the phase detector 9, and the second input of measurement unit 4 is connected to the output of controlled generator 11, connected in series by time converter 16 and comparison unit 17, two period meters 18 and 19, paralleled by the inputs and connected to the output of the first divider 7, and outputs to the first and third inputs of the comparison block 17, synchronizer 20, outputs connected to the second inputs of the 18 and 19 period meters and comparison block 17, output The time converter 16 is connected to the input of the adder 10, additional first and second frequency multipliers 21 and 22 connected in series, the input of the first one is connected to the output of the first divider 7, the measuring unit 23 and the phase meter 24, the last of which are connected by the second inputs to the control outputs generator 11 and the main unit 4 measurements. The vibration spectrum analyzer works as follows. The signal with the frequency FC from the vibration sensor 2 is fed to the first input of the measurement unit 4, the second input of which receives the signal with the frequency NFp + RFC - the rotor speed; intermediate frequency; 1, 2, 3, ... is the number of the harmonic under study. The signal formed in block 4 of measurement is fed to block 5 of registration. The frequency of the signal received at the second input of the measurement unit 4 is synchronously tuned to the frequency of the reference signal FO which is generated by the 3 turn sensor. The reference signal is formed in the driver 6 and is converted into a second circuit. In the first divider 7, this signal is converted into a signal with frequency - & -, where M is the division factor of the first divider 7, and is fed through frequency converter 8 to the input of adder 10. Frequency converter 8 is included in the broadband control branch (not indicated) performs a coarse tuning of the frequency of the controlled generator 11 in the whole range of tracking frequencies. From the output of the phase selector 9, which is part of the narrow-band control branch (not shown), the rotor frequency is synthesized to the phase. The other input of the phase detector 9 receives the signal of the synthesized rotor frequency FCM, which is divided by frequency in dividers 14 and 15 by NK, where N and K are the division factors of dividers 14 and 15, and then goes to the input of summat 10. Signal with frequency by transferring the frequency of the NFp, H-Rpc is generated by the controlled oscillator 11 into the frequency domain transmitted by the filter 13 using the frequency transfer oscillator 1 tuned to the frequency of the ROC. Thus, the inputs of the phase detector 1; mouth 9 receive signals with frequencies. When the frequencies are equal, the synchronization and tracking condition f is fulfilled, which allows synthesizing the rotor frequency p NK with Gr - --D 0 By choosing the division factors K and At, you can compensate for the reduction in the sensor drive 3 turns, and using the division factor N, the measurement unit 4 adjusts on harmonic or subharmonic rotor frequency. Frequency converter 8 performs the reorganization of the controlled generator 11 in non-stationary engine operating modes. Period meters 18 and 19 are measured during two identical time intervals, the following-pulses period -D-Block .17 comparison determines the change of the period of the signal with the reference frequency, and the time converter 16 generates a signal arriving at the adder 10 and then at the input of the generator I, causing an accelerated tuning of the generation frequency NFp + 5.4. The synchronizer 20 provides synchronous operation. It has 18 and 19 periods and an adder 10. The phase shift between the reference signal coming from the output of the measuring unit 23 and the harmonics of the vibration signal is measured with a phase meter 24. So that these signals coincide in frequency in the reference channel, which includes a 3 turn sensor The driver 6, the first divider 7, the first frequency multiplier 21, the second frequency multiplier 22, the measuring unit 23, compensates for the reduction in the actuator of the speed sensor 3 using the first divider 7 and the first frequency multiplier 21. Using the second divider 14 and the second multiplier 22, the frequency of the phase meter 24 is adjusted to measure the phase shift of the harmonic or subharmonic of the rotor frequency. Measurement of the wasp phase shift

Claims (1)

Claim Vibration spectrum analyzer of rotating parts according to ed. St. No. 838401, characterized in that, in order to increase the control performance, it is equipped with additional, series-connected first and second frequency multipliers, the input of the first of them is connected to the output of the first divider, the measuring unit and the phase meter, the last of which are connected by the second inputs respectively to the outputs of the controlled generator and the main unit of measurement.