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Multi-condition fault monitoring method based on distributed PCA

A technology of fault monitoring and multi-working conditions, applied in the direction of electrical testing/monitoring, testing/monitoring control systems, instruments, etc., can solve the problem that the fault monitoring model cannot obtain ideal results

Active Publication Date: 2018-11-06
JIANGNAN UNIV
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Problems solved by technology

[0005] The actual industrial production process will switch production conditions according to the demand, so the obtained historical data often contains information of multiple operating states, showing the characteristics of multi-distribution. Under this condition, it is impossible to directly establish a fault monitoring model for the process. ideal effect

Method used

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  • Multi-condition fault monitoring method based on distributed PCA
  • Multi-condition fault monitoring method based on distributed PCA
  • Multi-condition fault monitoring method based on distributed PCA

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Embodiment

[0073] This embodiment provides a multi-working-condition fault monitoring method based on distributed PCA. This embodiment takes a common chemical process—TE process (Tennessee Eastman Process) as an example; the experimental data comes from the TE process, and the TE process 21 faults were monitored; see Figure 4 , the method includes:

[0074] Step 1: Obtain the normal working condition data set, and standardize it to obtain the data set through the LNS method. The LNS method is:

[0075] Assuming that the m-dimensional original process data is , the LNS method uses the local neighborhood mean and standard deviation information of each sample to standardize, so as to normalize each working condition and obtain standardized data with a single distribution. The standardized data is:

[0076]

[0077] in, represents the sample x i Among the a nearest neighbors in X, the distance criterion is determined by the Euclidean distance; represents the sample x i the first ...

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Abstract

The invention discloses a multi-condition fault monitoring method based on a distributed PCA, and belongs to the field of complex industrial process modeling and fault diagnosis. According to the method, for the problem that data presents a multi-condition characteristic in some complex industrial processes, local neighborhood standardization processing is performed on multi-condition process dataso that the multi-distribution characteristic of the data is eliminated; then PCA decomposition is performed, the most correlated variable construction sub-blocks are selected in extracted differentprincipal component directions, automatic decomposition of the whole process is realized, a distributed fault monitoring model is established, and a corresponding monitoring statistic is obtained; andfinally, fusion of the obtained sub-block monitoring statistics is performed by employing a Bayesian inference method so that online monitoring of faults is realized.

Description

technical field [0001] The invention relates to a multi-working condition fault monitoring method based on distributed PCA, which belongs to the field of complex industrial process modeling and fault diagnosis. Background technique [0002] At present, with the continuous expansion of industrial production scale in modern chemical industry and metallurgy, the complexity of process flow is getting higher and higher. Fault monitoring has become a research hotspot in the field of process control. [0003] Based on this background, multivariate statistical process monitoring (MSPM) has been widely used in the field of process monitoring, among which principal component analysis (PCA) is the most commonly used method in multivariate statistical methods. Dimensionality reduction, eliminating the correlation between variables, and monitoring the process by establishing the statistics of the principal component subspace and residual subspace, and can obtain better monitoring results...

Claims

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Application Information

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IPC IPC(8): G05B23/02
CPCG05B23/024
Inventor 熊伟丽顾炳斌马君霞
Owner JIANGNAN UNIV
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