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Industrial process fault diagnosis system and method based on wavelet analysis

A fault diagnosis system and industrial production technology, applied in the direction of total factory control, total factory control, electrical program control, etc., can solve the problems that the multi-scale characteristics of the process are not considered, and fault diagnosis is difficult to obtain better diagnostic results.

Inactive Publication Date: 2009-04-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current fault diagnosis methods often only consider the multicollinearity and nonlinear characteristics of industrial processes, but do not consider the multi-scale characteristics of the process. It is often difficult to obtain better fault diagnosis methods for complex industrial processes that are seriously affected by multi-scale characteristics. Diagnostic effect

Method used

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  • Industrial process fault diagnosis system and method based on wavelet analysis
  • Industrial process fault diagnosis system and method based on wavelet analysis
  • Industrial process fault diagnosis system and method based on wavelet analysis

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Experimental program
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Effect test

Embodiment 1

[0086] refer to figure 1 , figure 2 , image 3 as well as Figure 4 , a kind of industrial production process fault diagnosis system based on wavelet analysis, including field intelligent instrument 2 connected with industrial process object 1, DCS system and host computer 6, described DCS system is composed of data interface 3, control station 4, database 5 Composition; smart instrument 2, DCS system, and host computer 6 are connected in turn through the field bus, and the host computer 6 includes:

[0087] The standardization processing module 7 is used to standardize the data. The mean value of each variable is 0 and the variance is 1 to obtain the input matrix X. The following process is used to complete:

[0088] 1) Calculate the mean: TX ‾ = 1 N Σ i = 1 N TX i ...

Embodiment 2

[0177] refer to figure 1 , figure 2 , image 3 as well as Figure 4 , a kind of industrial production process fault diagnosis method based on wavelet analysis, described fault diagnosis method comprises the following steps:

[0178] (1), determine the used key variable of fault diagnosis, collect the data of described variable when system is normal and fault respectively from the history database of DCS database as training sample TX;

[0179] (2), in wavelet decomposition module 8, principal component analysis module 9 and support vector machine classifier module 11, set respectively the parameters such as wavelet decomposition layer number, principal component analysis variance extraction rate, support vector machine kernel parameter and confidence probability, Set the sampling period in DCS;

[0180] (3), the training sample TX is in the upper computer 6, and the data is standardized, so that the mean value of each variable is 0, and the variance is 1, and the input ma...

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Abstract

An industrial production process diagnostic system based on small wave analysis comprises industrial process object connected on site intelligent meter, DCS system and its upper position control machine with the DCS system made of data interface, control station, data base, the intelligent meter, DCS system and the upper position control machine connected sequentially, with the said upper position control machine composed of standardized handling module, small wave dissolving module, pivot element analysis function module, small wave restructuring module, support vector machine classifier module and diagnostic judging module. It also puts forward a failure diagnostic method. It provides an industrial production process failure diagnostic system and method with good diagnostic effect based on small wave analysis.

Description

(1) Technical field [0001] The invention relates to the field of industrial process fault diagnosis, in particular to a wavelet analysis-based industrial production process fault diagnosis system and method. (2) Background technology [0002] Due to the requirements of product quality, economic benefits, safety and environmental protection, industrial processes and related control systems have become very complex. In order to ensure the normal operation of industrial systems, fault diagnosis and detection play a very important role in industrial processes. In recent years, the application of statistical analysis to process monitoring and fault diagnosis has been extensively studied. [0003] Using industrial measured data, using statistical methods for fault diagnosis, avoiding complex mechanism analysis, and relatively convenient solution. Since the industrial process has multi-scale characteristics in nature, such as the spatial multi-scale characteristics of micro- and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 刘兴高阎正兵
Owner ZHEJIANG UNIV
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