CN101363766A - Method for implementing whole cycle sampling for dynamic balancing measurement - Google Patents
Method for implementing whole cycle sampling for dynamic balancing measurement Download PDFInfo
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- CN101363766A CN101363766A CNA2008100426865A CN200810042686A CN101363766A CN 101363766 A CN101363766 A CN 101363766A CN A2008100426865 A CNA2008100426865 A CN A2008100426865A CN 200810042686 A CN200810042686 A CN 200810042686A CN 101363766 A CN101363766 A CN 101363766A
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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
The present invention relates to the signal sampling process field, relate in particular to the integer-period sampled implementation method in a kind of dynamic-balance measuring system.
Background technology
Along with the develop rapidly of commercial production and science and technology, the working speed of various rotating machineries (plant equipment such as steam turbine, the hydraulic turbine, generator, aeromotor, centrifugal compressor) is more and more high.If the amount of unbalance of rotor is big, can influences the serviceable life of equipment, even cause a serious accident.Therefore, the balance correction of rotational parts and rotary machine and troubleshooting issue just seem important all the more.Dynamic balancing measurement and fault diagnosis all are to realize with processing by the analysis to vibration signal, adopt advanced theories such as FFT conversion or wavelet transformation to carry out the extraction of unbalancing value or the extraction of fault signature value, can improve the precision of measuring and diagnosing greatly.In FFT or wavelet transformation, need in the rotating machinery one-period, evenly extract several vibration datas (32,64 etc.).Because Windows is a non-real time operating system, under the Windows of PC environment, realize integer-period sampled relatively difficulty.At present, integer-period sampled mode adopts the acquisition system of independently developed special use mostly, and integer-period sampled data are passed to PC by communication port, carries out complicated calculating then on PC.This mode not only the construction cycle long, cost of development height, and underaction not.
Summary of the invention
The purpose of this invention is to provide a kind ofly based on PC and universal data collection card hardware environment, realize the integer-period sampled method of signal under Windows operating system, concrete technical scheme is that a kind of integer-period sampled implementation method may further comprise the steps:
Preset the time period of sampling period and sampling;
Start sampling key signal and simulating signal;
The sampled result of described key signal and described simulating signal is put into corresponding array according to sampling order separately;
From the array of the sampled result correspondence of described key signal, search rising edge, if can not find two continuous rising edges, then increase the sampling time section and reduce sample frequency,, then note the corresponding constantly array index of two rising edges if found two continuous rising edges;
Calculate rotating speed;
Extract data corresponding in the simulating signal array as the data in the complete cycle according to subscript;
Evenly pick out desired data from complete cycle the data.
The present invention is on the hardware foundation of PC and data collecting card, has realized integer-period sampled for the mechanical rotor vibration signal on WINDOWS operating system, has reduced the cost of development of dynamic-balance measuring system, the dirigibility that has improved system.
Description of drawings
Fig. 1 is the realization flow figure of the inventive method
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described further.
The present invention is under the Windows of PC environment, realizes integer-period sampled to external signal by universal PC I data collecting card.Promptly utilize the accurate timing device in the universal PC I data collecting card to realize the high speed timing sampling, the method for extracting in conjunction with software in the PC obtains integer-period sampled data.External input signal is key signal and several simulating signal, simultaneously key signal and simulating signal is carried out high-speed sampling, and the rising edge that utilizes the pulse of key phase is signal as a token of, extracts the several number certificate in complete cycle.
As shown in Figure 1, preset the time period that sample frequency and sampling continue before the sampling earlier, here the value that presets is that the rotating speed according to tested rotating machinery comes guestimate, and the sample frequency that presets will be a little more than 5000 times of rotating machinery frequency, and the sampling time is larger than 2 times of rotating machinery cycle.After starting, systematic sampling can adjust the time period of sample frequency and sampling according to the actual speed of rotating machinery automatically.
Each signals sampling data is put into array respectively in order, and the subscript of array is represented the sequence number of sampling, and two continuous rising edges of inquiry from the array of key signal correspondence write downs two subscript values of corresponding array constantly, remember and make n
1, n
2, the rotating machinery rotating speed can calculate according to following formula:
Wherein f is the sample frequency of data collecting card.In the array of simulating signal correspondence, take out small tenon then and be positioned at n
1, n
2Between data, put into new array.The number of the data in the one-period according to demand, from new array, evenly pick out the several number certificate, when running into subscript in the process of evenly selecting and being not integer, can adopt the mode round numbers that rounds up, the error that causes thus is less, because one-period has 5000 sampled datas more, error is less than 2/10000ths.
If adopt the sampling time section that presets can not look for two continuous rising edges in one-period, system can increase the time period of sampling automatically.If the data in the one-period are very few, i.e. n-n
1Too small, system can increase sample frequency automatically and increase the interior sampled data of one-period.
By in the description of above embodiment as can be known, technical scheme of the present invention has following characteristics: sample simultaneously to key signal and simulating signal (1), the effect of key signal has two: obtain the marking signal of complete cycle and calculate the rotating speed of rotating machinery; (2) key signal is nursed one's health into the square-wave signal of standard, by the AD passage key signal is gathered, and guarantees with the collection of simulating signal synchronous; (3) adjust the frequency of sampling automatically according to the rotating speed of the rotating machinery that measures.
Claims (1)
1. an integer-period sampled implementation method that is used for dynamic-balance measuring system is characterized in that, may further comprise the steps:
Preset the time period of sampling period and sampling;
Start sampling key signal and simulating signal;
The sampled result of described key signal and described simulating signal is put into corresponding array according to sampling order separately;
From the array of the sampled result correspondence of described key signal, search rising edge, if can not find two continuous rising edges, then increase the sampling time section and reduce sample frequency,, then note the corresponding constantly array index of two rising edges if found two continuous rising edges;
Calculate rotating speed;
Extract data corresponding in the simulating signal array as the data in the complete cycle according to subscript;
Evenly pick out desired data from complete cycle the data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100426865A CN101363766A (en) | 2008-09-09 | 2008-09-09 | Method for implementing whole cycle sampling for dynamic balancing measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100426865A CN101363766A (en) | 2008-09-09 | 2008-09-09 | Method for implementing whole cycle sampling for dynamic balancing measurement |
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| Publication Number | Publication Date |
|---|---|
| CN101363766A true CN101363766A (en) | 2009-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008100426865A Pending CN101363766A (en) | 2008-09-09 | 2008-09-09 | Method for implementing whole cycle sampling for dynamic balancing measurement |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790476A (en) * | 2011-05-17 | 2012-11-21 | 大连光洋科技工程有限公司 | Dynamic balance analysis device |
| CN103852213A (en) * | 2012-12-06 | 2014-06-11 | 施耐宝仪器股份有限公司 | Method of determining rotary angle related data of vehicle wheel |
| CN113126530A (en) * | 2019-12-30 | 2021-07-16 | 珠海极海半导体有限公司 | Method for calculating sampling rate of timer filter and control device |
-
2008
- 2008-09-09 CN CNA2008100426865A patent/CN101363766A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102790476A (en) * | 2011-05-17 | 2012-11-21 | 大连光洋科技工程有限公司 | Dynamic balance analysis device |
| CN102790476B (en) * | 2011-05-17 | 2016-08-24 | 科德数控股份有限公司 | Dynamic balance analysis device |
| CN103852213A (en) * | 2012-12-06 | 2014-06-11 | 施耐宝仪器股份有限公司 | Method of determining rotary angle related data of vehicle wheel |
| CN113126530A (en) * | 2019-12-30 | 2021-07-16 | 珠海极海半导体有限公司 | Method for calculating sampling rate of timer filter and control device |
| CN113126530B (en) * | 2019-12-30 | 2022-03-18 | 珠海极海半导体有限公司 | Method for calculating sampling rate of timer filter and control device |
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Open date: 20090211 |