CN203132688U - Device for realizing synchronous order-domain trace analysis on rotating mechanical vibration signals - Google Patents
Device for realizing synchronous order-domain trace analysis on rotating mechanical vibration signals Download PDFInfo
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- CN203132688U CN203132688U CN 201320108725 CN201320108725U CN203132688U CN 203132688 U CN203132688 U CN 203132688U CN 201320108725 CN201320108725 CN 201320108725 CN 201320108725 U CN201320108725 U CN 201320108725U CN 203132688 U CN203132688 U CN 203132688U
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Abstract
The utility model relates to a device for realizing the synchronous order-domain trace analysis on rotating mechanical vibration signals, which comprises a multi-path signal acquisition and A/D conversion circuit, and a signal processing circuit. The multi-path signal acquisition and A/D conversion circuit is provided with multi-path signal receiving interfaces, wherein one of the multi-path signal receiving interfaces is served as a key-phase pulse signal interface used for receiving rotating mechanical key-phase pulses and at least four of the others are served as rotating mechanical vibration signal interfaces. The signal processing circuit is composed of a CPU chip and an FPGA chip. The FPGA chip is provided with filtering processing channels connected with the multi-path signal receiving interfaces of the A/D conversion circuit correspondingly, and a sampling frequency generator. The device is simple in structure. Due to the adoption of the device, the defect in the prior art that since the sampling frequency needs to be continuously adjusted, acquired waveform data are discontinuous with intervals due to the adoption of the traditional hardware mode can be overcome. In this way, waveform data can be acquired continuously and the accurate uniform-angle sampling can also be realized without the need of any other hardware, such as phase-locked loop, doubling circuits and the like.
Description
Technical field
The utility model relates to the machinery vibration analysis fields of measurement, particularly a kind of device of realizing that the rotating machinery vibrating signal is analyzed with the step comparison-tracking.
Background technology
Traditional rotating machinery vibrating rank comparison-tracking method adopts hardware mode to realize, phaselocked loop, frequency multiplication frequency dividing circuit need be arranged, and frequency overlapped-resistable filter of cutoff frequency Adjustable real-time etc., circuit complexity need be arranged, the cost height has particularly carried out primary study at the equal angles resampling.Hardware implementation mode subject matter is: 1) sample frequency need be carried out pre-estimation by the rotating speed of rotating machinery last time, estimates to exist error, therefore can not realize accurate complete cycle of synchronized sampling, thereby cause FFT result to have spectral leakage; 2) the required adjustable frequency overlapped-resistable filter complex structure of cutoff frequency of hardware mode, because sample frequency needs constantly to adjust, the Wave data that collects exists at interval, discontinuous shortcoming.Notification number is the Chinese patent of CN102175439, and disclosing a kind of " at the order analysis implementation method of rotating machinery " its reciprocity angle resampling is " low speed pulse and the tacho-pulse on the current high speed shaft according to renewal frequency carry out the equal angles resampling to the capture card output signal respectively ".This kind method is constant or change hour quite effectively at the rotary machine rotating speed, but changes at any time when big when rotating speed, and the renewal frequency of this moment is that the frequency computation part when being sampled by the first time gets; Therefore, resample when carry out equal angles with the tacho-pulse on this renewal frequency and the current high speed shaft, the tacho-pulse on renewal frequency and the current high speed shaft is asynchronous with bringing.
Summary of the invention
For solving prior art problems, the utility model proposes a kind of device of realizing that the rotating machinery vibrating signal is analyzed with the step comparison-tracking, realize accurate equiangular sampling by this device by fixing sample frequency, there is not the frequency confusion phenomena, just the rotating shaft revolution is moving once, sampled point is consistent corresponding to the differential seat angle in the rotating shaft, and the position is fixed in rotating shaft, thereby realizes accurately synchronized sampling complete cycle.
The purpose of this utility model is achieved in that a kind of device of realizing that the rotating machinery vibrating signal is analyzed with the step comparison-tracking, comprise multiplexed signal sampling A/D change-over circuit and signal processing circuit, described multiplexed signal sampling A/D change-over circuit is provided with the multiple signals receiving interface, in the described multiple signals receiving interface a road is key phase pulse signal interface, is used for receiving the rotating machinery key phase pulse simulation signal that is transmitted by photoelectric sensor; All the other have at least four the tunnel to be the vibration signal interface in the described multiple signals receiving interface, are used for receiving the rotating machinery vibrating signal that is transmitted by vibration transducer; Described signal processing circuit comprises a central processing unit chip and a fpga chip, described fpga chip is provided with filtering treatment channel and the sample frequency generator of multiple signals interface in the corresponding A/D of the connection change-over circuit, the control mouth of described fpga chip is connected with the control mouth of central processing unit chip, the data port of central processing unit chip connects the data port of fpga chip, and fpga chip connects display.
Further, be provided with the cascaded integrator-comb filter processor in the path of described filtering treatment channel corresponding keys phase pulse signal interface, be provided with the FIR digital filter processor in the path of the corresponding vibration signal interface of described filtering treatment channel.
Further, described multiplexed signal sampling A/D change-over circuit is that model is 16 8 passage A/D acquisition modules of AD7606.
The utility model to the contribution of prior art is:
1. simple in structure, need not to add any other and just can realize accurate equiangular sampling as hardware such as phaselocked loop, frequency multiplier circuits, there is not the frequency confusion phenomena, just the rotating shaft revolution is moving once, sampled point is consistent corresponding to the differential seat angle in the rotating shaft, the position is fixed in rotating shaft, thereby realizes accurately synchronized sampling complete cycle.
2. when the utility model had overcome the traditional hardware mode, because sample frequency needs constantly to adjust, the Wave data that collects existed at interval, discontinuous shortcoming, the uninterrupted collection continuously that can realize waveform.
Below in conjunction with embodiment and accompanying drawing the present invention is done a detailed description.
Description of drawings
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
A kind of device embodiment that realizes that the rotating machinery vibrating signal is analyzed with the step comparison-tracking, referring to Fig. 1, comprise multiplexed signal sampling A/D change-over circuit 1 and signal processing circuit, described multiplexed signal sampling A/D change-over circuit is provided with the multiple signals receiving interface, in the described multiple signals receiving interface a road is key phase pulse signal interface, is used for receiving the rotating machinery key phase pulse simulation signal that is transmitted by photoelectric sensor 2; All the other have at least four the tunnel to be the vibration signal interface in the described multiple signals receiving interface, are used for receiving the rotating machinery vibrating simulating signal of being transmitted by vibration transducer 3; Described signal processing circuit comprises a central processing unit chip 4 and a fpga chip 5, described fpga chip is provided with filtering treatment channel and the sample frequency generator of multiple signals interface in the corresponding A/D of the connection change-over circuit, the control mouth of described fpga chip is connected with the control mouth of central processing unit chip, the data port of central processing unit chip connects the data port of fpga chip, fpga chip connects display 6, and fpga chip also is connected with SDRAM and SRAM storer respectively simultaneously.
Among the embodiment, be provided with the cascaded integrator-comb filter processor in the path of described filtering treatment channel corresponding keys phase pulse signal interface, be provided with the FIR digital filter processor in the path of described filtering treatment channel corresponding rotation mechanical oscillation signal interface.
Among the embodiment, described multiplexed signal sampling A/D change-over circuit is that model is the synchronous A/D acquisition module of 16 8 passages of AD7606.
Adopt above-described embodiment to realize that by fixing sample frequency the rotating machinery vibrating signal with step comparison-tracking analytical approach is: to adopt fixed sampling frequency to gather rotating machinery vibrating signal and rotating speed key phase pulse signal synchronously, choose vibration rank than number M, utilize interpolation filter to the key phase pulse carry out 2*M times of interpolation, obtain equal angles vibration sampled signal, handle through reciprocity angular vibration sampled signal, finally obtain vibrating each order harmonics waveform; Its concrete steps are:
1) by gathering rotating machinery vibrating signal and rotating speed key phase pulse signal greater than maximum (top) speed frequency * rank than the fixed sampling frequency continuous synchronization of number M;
2) according to the time of arrival of a threshold value identification key phase pulse signal rising edge and negative edge, by arrival per two interpulse mistimings of Time Calculation, thereby true rotating machinery revolution moves rotating speed and all instantaneous frequencys in a week;
3) employing is based on the cascade integral comb filter (CIC of FPGA, Cascaded Integrator Comb filter) as interpolation filter, fixed sampling frequency between the pulse of two key phases is carried out (N=2*M) times filtering interpolation, obtain the equal angle signal time corresponding of the vibration sequence of vibration signal;
4) by rotating machinery instantaneous frequency and time series, vibration signal is carried out digital filtering and interpolation obtains (corresponding seasonal effect in time series) equiangular sampling signal.
5) reciprocity angle sampled signal is carried out Fourier transform (FFT) and is obtained continuous rotating machinery vibrating rank comparison, and reciprocity angle sampled signal is carried out permanent bandwidth filtering or Gabor conversion, obtains each continuous order harmonics waveform.
The realization of present embodiment real-time follow-up: a signal analysis was just carried out in every collection in 0.25 second, signal resampling frequency is (because signal has been finished collection according to the actual rotation frequency, carry out accurate Calculation according to signal) adjust, but not under the hardware mode, by last rotational frequency value, rotational frequency is next time predicted, again sample frequency is adjusted.
Among the embodiment, described interpolation is a kind of in linear interpolation, spline interpolation, Lagrange's interpolation or the sinc interpolation algorithm.
Among the embodiment, described rank are 2 X powers than number M, and X is the positive integer more than 4 or 4.
Among the embodiment, described digital filtering adopts Kaiser window FIR wave filter.
In the present embodiment:
1) according to a certain fixing sample frequency; Gather one road rotating speed key phase pulse signal of rotating machinery synchronously; With four road vibration signals;
2) to the key phase pulse signal, according to rise (or decline) along the artificial assign thresholds (threshold) of magnitude of voltage size, or according to a certain algorithm, by the statistics rule, calculated threshold size automatically.According to this threshold value, by the detection algorithm, accurately identify and record t0 time of arrival, t1, the t2 of key phase pulse signal rising edge (or negative edge) ... tN;
3) by two interpulse mistimings, dt0=t1-t0, dt1=t2-t1 ..., dtN-1=tN-tN-1 calculates rotating speed rpm and instantaneous frequency f;
4) set rank and can get 16,32,64,128,256 etc. than number M(according to analyzing needs), adopt the CIC interpolation filter, N times of interpolation (N=2*M) carried out in pulse to the key phase, obtains each sample time corresponding sequence of angular domain equal angles vibration signal;
5) by rotor instantaneous frequency and resampling time series, vibration signal is carried out digital filtering and interpolation resampling, obtain the equiangular sampling signal, wherein, interpolation can adopt linear interpolation, spline interpolation, Lagrange's interpolation or sinc interpolation algorithm;
6) reciprocity angle sampled signal is carried out Fourier transform (FFT), obtains rotating machinery vibrating rank comparison, and reciprocity angle sampled signal is carried out permanent bandwidth filtering or Gabor conversion, can obtain each order harmonics waveform.
Adopt the present embodiment method, use 24 bit data capture card-USB4432 of America NI company or model to be the synchronous A/D acquisition module of 16 8 passages of AD7606, need not to add any other hardware (as phaselocked loop, frequency multiplier circuit etc.), gather 1 road rotating speed key signal and 4 road vibration signals respectively by 1 photoelectric sensor and 4 vibration transducers, namely constituted a high precision vibration signals collecting analytic system, realized that variable speed vibration signal rank comparison-tracking is gathered and the rank ratio is analyzed function.
Present embodiment method purpose is to realize accurate equiangular sampling, and just moving once sampled point is consistent corresponding to the differential seat angle in the rotating shaft to the rotating shaft revolution, and the position is fixed in rotating shaft, thereby realizes accurately synchronized sampling complete cycle.
Claims (3)
1. realize that the rotating machinery vibrating signal is with the device of step comparison-tracking analysis for one kind, it is characterized in that, described device comprises multiplexed signal sampling A/D change-over circuit and signal processing circuit, described multiplexed signal sampling A/D change-over circuit is provided with the multiple signals receiving interface, in the described multiple signals receiving interface a road is key phase pulse signal interface, is used for receiving the rotating machinery key phase pulse simulation signal that is transmitted by photoelectric sensor; All the other have at least four the tunnel to be the vibration signal interface in the described multiple signals receiving interface, are used for receiving the rotating machinery vibrating signal that is transmitted by vibration transducer; Described signal processing circuit comprises a central processing unit chip and a fpga chip, described fpga chip is provided with filtering treatment channel and the sample frequency generator of multiple signals interface in the corresponding A/D of the connection change-over circuit, the control mouth of described fpga chip is connected with the control mouth of central processing unit chip, the data port of central processing unit chip connects the data port of fpga chip, and fpga chip connects display.
2. a kind of rotating machinery vibrating signal of realizing according to claim 1 is with the device of step comparison-tracking analysis, it is characterized in that, be provided with the cascaded integrator-comb filter processor in the path of described filtering treatment channel corresponding keys phase pulse signal interface, be provided with the FIR digital filter processor in the path of the corresponding vibration signal interface of described filtering treatment channel.
3. a kind of device of realizing that the rotating machinery vibrating signal is analyzed with the step comparison-tracking according to claim 1 is characterized in that described multiplexed signal sampling A/D change-over circuit is that model is 16 8 passage A/D acquisition modules of AD7606.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644963A (en) * | 2013-11-28 | 2014-03-19 | 陕西千山航空电子有限责任公司 | A module and a method for acquiring and processing a vibration signal of the rotating component of a helicopter |
| CN104931257A (en) * | 2015-06-17 | 2015-09-23 | 昆明理工大学 | Method used for extracting speed fluctuation through minimized signal spectrum information entropy |
| CN112987613A (en) * | 2021-02-24 | 2021-06-18 | 深圳中广核工程设计有限公司 | Distributed rotating machinery state online monitoring and fault analysis system |
| CN114485914A (en) * | 2021-12-23 | 2022-05-13 | 厦门乃尔电子有限公司 | Vibration order tracking analysis method |
| CN114608821A (en) * | 2022-03-01 | 2022-06-10 | 北京辰宇航康科技有限公司 | Method and device for determining order spectrum of vibration signal of rotating machine |
-
2013
- 2013-03-11 CN CN 201320108725 patent/CN203132688U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103644963A (en) * | 2013-11-28 | 2014-03-19 | 陕西千山航空电子有限责任公司 | A module and a method for acquiring and processing a vibration signal of the rotating component of a helicopter |
| CN104931257A (en) * | 2015-06-17 | 2015-09-23 | 昆明理工大学 | Method used for extracting speed fluctuation through minimized signal spectrum information entropy |
| CN104931257B (en) * | 2015-06-17 | 2017-09-22 | 昆明理工大学 | A kind of method by minimizing the extraction fluctuation of speed of signal spectrum comentropy |
| CN112987613A (en) * | 2021-02-24 | 2021-06-18 | 深圳中广核工程设计有限公司 | Distributed rotating machinery state online monitoring and fault analysis system |
| CN114485914A (en) * | 2021-12-23 | 2022-05-13 | 厦门乃尔电子有限公司 | Vibration order tracking analysis method |
| CN114485914B (en) * | 2021-12-23 | 2023-05-30 | 厦门乃尔电子有限公司 | Vibration order tracking analysis method |
| CN114608821A (en) * | 2022-03-01 | 2022-06-10 | 北京辰宇航康科技有限公司 | Method and device for determining order spectrum of vibration signal of rotating machine |
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