Non-Gaussian industrial process fault detection method and system

A technology for industrial process and fault detection, applied in the direction of electrical program control, comprehensive factory control, etc., can solve problems such as only considering a single data set, no better solution, and limited kernel function parameter selection.

Active Publication Date: 2019-08-27
CENT SOUTH UNIV
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Problems solved by technology

[0005] On the other hand, for non-Gaussian processes, the existing non-Gaussian process detection methods based on multivariate statistical analysis are mainly divided into two categories, one is based on existing multivariate statistical analysis methods combined with threshold determination methods, the main threshold determination methods are Based on Gaussian mixture model (Gaussian mixture model, GMM), based on kernel function estimation (Kernel-based) and based on sequential quantile method (Sequential quantile estimation, SQE), although these methods have been applied, they are still limited by the kernel Function parameter selection and other issues; the other is the method based on ICA, which does not need to assume the Gaussian distribution of the process variable, and builds the corresponding statistics for fault detection by finding independent pivots, but this type of method only considers single data Set, and the determination of the threshold is also based on GMM, kernel-based, SQE, etc.
Therefore, how to make full use of data correlation and a more convenient and practical threshold determination method to detect non-Gaussian processes in real time, there is still no better solution

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Embodiment 1

[0041] A non-Gaussian industrial process fault detection method, referring to figure 1 ,include:

[0042] The first step is to select a certain number of normal historical data sets, preprocess the data sets to remove the mean value, and use the canonical correlation analysis method to establish a residual generator. This step can be performed offline and includes:

[0043]Step A1, using the historical database to select process data under normal operating conditions, using Indicates two variable data sets of the process, where l is the number of measured variables in vector u, m is the number of measured variables in vector y, and N is the number of independent sampling points; then u(i), i=1,...,N represent the vector The measured value of the l variable in u at the i-th sampling time, y(i), i=1,..., N represents the measured value of the m variables in the vector y at the i-th sampling time.

[0044] Step A2. Perform de-mean processing on the data set; respectively perf...

Embodiment 2

[0097] As a degraded implementation of the above-mentioned embodiment 1, in the above-mentioned detection process, it is possible to simply rely on the first residual generator or the second residual generator for detection. On the premise of reducing the amount of related data processing, the accuracy is compared to The combined detection method of the first and second residual generators degrades slightly.

[0098] The non-Gaussian industrial process fault detection method disclosed in this embodiment (can refer to the above-mentioned embodiment 1), including:

[0099] The first step is to select a certain number of normal historical data sets, preprocess the data sets to remove the mean value, and use the canonical correlation analysis method to establish a residual generator; specifically include:

[0100] Step A1, using the historical database to select process data under normal operating conditions, using Indicates two variable data sets of the process, where l is the ...

Embodiment 3

[0122] This embodiment is similar to the above-mentioned embodiment 2, and discloses a non-Gaussian industrial process fault detection method (can refer to the above-mentioned embodiment 1), including:

[0123] The first step is to select a certain number of normal historical data sets, preprocess the data sets to remove the mean value, and use the canonical correlation analysis method to establish a residual generator; specifically include:

[0124] Step A1, using the historical database to select process data under normal operating conditions, using Indicates two variable data sets of the process, where l is the number of measured variables in vector u, m is the number of measured variables in vector y, and N is the number of independent sampling points; then u(i), i=1,...,N represent the vector The measured value of the l variable in u at the i-th sampling moment, y(i), i=1,..., N represents the measured value of the m variable in the vector y at the i-th sampling moment; ...

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Abstract

The invention relates to the field of industrial process monitoring and fault diagnosis, and discloses a fault detection method and system of a non-Gaussian industrial process in order to online detect the non-Gaussian industrial process conveniently and practically. The method includes: step 1, selecting a certain quantity of normal historical data sets, performing mean value preprocessing on the data sets, and establishing a residual generator by employing a canonical correlation analysis method; step 2, determining a corresponding threshold of the corresponding residual generator by employing a Monte Carlo method; and step 3, performing real-time online detection on industrial process data according to the determined threshold of the corresponding residual generator.

Description

technical field [0001] The invention relates to the field of industrial process monitoring and fault diagnosis, in particular to a non-Gaussian industrial process fault detection method and system. Background technique [0002] With the rapid development of information technology and data acquisition technology, factories and enterprises have abundant production data resources, and the era of industrial big data is slowly coming. In the process of industrial production, due to the harsh production environment and long-term operation, equipment will inevitably wear out or even fail. These abnormal conditions not only affect the quality of the product, but also affect the safe and stable operation of the system. Sometimes major production Accidents, relying entirely on the traditional detection methods of operators is not enough to solve complex process detection problems. [0003] The data in the actual production process is linear, nonlinear, Gaussian, non-Gaussian, etc. Fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
Inventor 陈志文彭涛阳春华袁小锋杨超杨笑悦
Owner CENT SOUTH UNIV
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