Method for implementing whole cycle sampling for dynamic balancing measurement

An implementation method and a full-cycle technology, applied in the field of full-cycle sampling, can solve problems such as high development cost, inflexibility, and long development cycle, and achieve the effect of reducing development cost and improving flexibility

Inactive Publication Date: 2009-02-11
SHANGHAI NORMAL UNIVERSITY
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  • Abstract
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Problems solved by technology

This method not only has a long development cycle, but also has high development costs and is not flexible enough.

Method used

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  • Method for implementing whole cycle sampling for dynamic balancing measurement

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Embodiment Construction

[0013] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] The invention realizes the whole-period sampling of the external signal through the universal PCI data acquisition card under the Windows environment of the PC. That is to use the precise timer in the general-purpose PCI data acquisition card to realize high-speed timing sampling, and combine the method of software extraction in the PC to obtain the data of the whole cycle sampling. The external input signal is the key phase signal and several analog signals, and the key phase signal and analog signal are sampled at high speed at the same time, and the rising edge of the key phase pulse is used as the flag signal to extract several data in the whole cycle.

[0015] Such as figure 1 As shown, the sampling frequency and sampling duration are preset before sampling. The preset value here is roughly estimated according to ...

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Abstract

The invention relates to a method for realizing complete alternation sampling in a dynamic balancing measuring system. The method comprises the steps of preset the sampling period and the sampling time period; staring a sampling key phase signal and an analog signal; placing the sampling results of the key phase signal and the analog signal to corresponding arrays according to the sampling sequence; searching for the rising edge, calculating rotation speed from the sampling result of the key phase in the corresponding arrays, extracting corresponding data in the analog signal array according to the subscript as the data of the complete alternation, and picking out required data from the data of the complete alternation. The invention realizes the complete alternation sampling for mechanical rotor oscillation signal on Windows operating system on the basis of the hardware of a PC and data acquisition card, reduces the development cost of the dynamic balancing measuring system and improves the flexibility of the system.

Description

technical field [0001] The invention relates to the field of signal sampling processing, in particular to a method for realizing full-period sampling in a dynamic balance measurement system. Background technique [0002] With the rapid development of industrial production and science and technology, the working speed of various rotating machinery (steam turbines, water turbines, generators, aeroengines, centrifugal compressors and other mechanical equipment) is getting higher and higher. If the unbalance of the rotor is large, it will affect the service life of the equipment and even cause major accidents. Therefore, the balance correction and fault diagnosis of rotating parts and rotating machinery are becoming more and more important. Both dynamic balance measurement and fault diagnosis are realized through the analysis and processing of vibration signals. Using advanced theories such as FFT transform or wavelet transform to extract dynamic unbalance or fault eigenvalues ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M1/22
Inventor 李传江张自强茅红伟
Owner SHANGHAI NORMAL UNIVERSITY
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