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Intermittent fault detection method of linear discrete time-delay system

A time-delay system, linear discrete technology, applied in the direction of fault location, measuring electricity, measuring devices, etc., can solve the problem of poor detection effect

Active Publication Date: 2019-07-26
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problem of poor detection effect when the existing fault detection method detects the intermittent fault of the time-delay system, and provides a method for detecting the intermittent fault of the linear discrete time-delay system, which can effectively detect the occurrence time and disappearance time of the intermittent fault , timely and effectively realize intermittent fault detection, improve fault detection rate, and reduce fault false alarm rate

Method used

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  • Intermittent fault detection method of linear discrete time-delay system
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  • Intermittent fault detection method of linear discrete time-delay system

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Embodiment

[0134] The Williams-Otto process has many typical chemical process characteristics, and is now widely used to test the advantages and disadvantages of chemical control algorithms and process monitoring methods. The Williams-Otto process mainly consists of a stirred tank reactor and a separation system including a cooler, bottle changer and distillation column. In this embodiment, it is assumed that the four states of the model represent the weights of two raw materials, intermediate products and target products, respectively.

[0135] The selected linear discrete time-delay system is as follows:

[0136]

[0137] In the formula,

[0138]

[0139] According to the output matrix C, the linear discrete time-delay system described in formula (1) is rewritten as a new linear discrete time-delay system as follows:

[0140]

[0141] Introducing virtual input η(k) and virtual output ρ(k), virtual input η(k) and virtual output ρ(k) are expressed as:

[0142]

[0143] A...

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Abstract

The invention relates to an intermittent fault detection method of a linear discrete time-delay system. The intermittent fault detection method comprises the steps that virtual input and virtual output are introduced according to the characteristics of the linear discrete time-delay system, a linear dimensionless discrete time-delay system is constructed, and the linear dimensionless discrete time-delay system is transformed into a linear dimensionless discrete time-invariant system by using a lifting method; on the basis of designing a state observer, truncated residual is constructed by introducing a sliding time window, and the statistical characteristics of the truncated residual are analyzed; and two hypothesis tests are used for setting detection thresholds of the intermittent faultoccurrence moment and vanishing moment respectively, amplitude of an intermittent fault is estimated, and the detectability problem of the intermittent fault is analyzed. The intermittent fault detection method of the linear discrete time-delay system is based on the lifting method and the designed state observer, the new truncated residual is designed by introducing the sliding window, the intermittent fault detection process can be quantitatively described, intermittent fault detection can be timely and effectively detected, the fault detection rate is increased, and the fault false alarm rate and missing report rate are decreased.

Description

technical field [0001] The invention belongs to the technical field of intermittent fault diagnosis of industrial systems, and in particular relates to an intermittent fault detection method for a linear discrete time-delay system. Background technique [0002] With the development of computer technology and control theory, modern industrial control systems have become more large-scale, complex and intelligent, and there is always a time delay in the transmission of information between various subsystems. Therefore, how to improve the safety and reliability of industrial time-delay systems has always been an important research topic in industrial safety production. After in-depth research by scholars in related fields, fault diagnosis methods for time-delay systems are roughly divided into three categories: model-based, data-driven and historical experience-based methods. Compared with the other two time-delay system fault diagnosis methods, the model-based time-delay syste...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 盛立张森高明周东华
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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