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First-order fixed-value control system regulating valve fault diagnosis method and system

A technology of fixed value control and fault diagnosis, which is applied in the general control system, control/adjustment system, test/monitoring control system, etc. It can solve the problem that the model is not universal, it is difficult to establish a mathematical model, and it is difficult to ensure the accuracy of fault diagnosis And other issues

Inactive Publication Date: 2020-01-14
CHINA JILIANG UNIV
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Problems solved by technology

For complex and special objects, it is sometimes difficult to establish an accurate mathematical model, it is difficult to ensure the accuracy of fault diagnosis, and the model is not universal

Method used

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  • First-order fixed-value control system regulating valve fault diagnosis method and system
  • First-order fixed-value control system regulating valve fault diagnosis method and system
  • First-order fixed-value control system regulating valve fault diagnosis method and system

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Experimental program
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Embodiment Construction

[0073] The specific implementation steps of the online fault diagnosis method provided by the present invention will be introduced below by taking a regulating valve of a liquid level control system at a certain stage as an example.

[0074] to combine figure 1 The flow shown, the steps are as follows:

[0075] 1. Set the given value of the liquid level to 10cm, and the sampling period T s =0.5s, collect the measurement output data of the liquid level sensor and the opening degree data of the regulating valve that are synchronized with the time variable. The normal operation data set is [T, Y nor ,V nor ], the additive fault running data set is [T,Y add ,V add ], the data set of multiplicative fault operation is [T,Y mul ,V mul ].

[0076] 2. Extract the fault features as shown in Table 1-Table 2 below:

[0077] Table 1 Fault eigenvalues ​​of different additive fault intensities

[0078]

[0079] Table 2 Fault eigenvalues ​​of different multiplicative fault intens...

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Abstract

The invention relates to a first-order fixed-value control system regulating valve fault diagnosis method and system. The method comprises the following steps: setting different types and different intensities of faults for a first-order fixed-value liquid level control system online, and analyzing fault characteristic values according to discrete data points; acquiring sensor detection data and regulating valve opening data of a normal stable system online to obtain a fault detection threshold value, and determining a fault detection algorithm; determining a fault estimation algorithm; establishing a fault qualitative model; and carrying out example verification of fault diagnosis methods and systems. The method and system can be widely applied to online fault diagnosis of the regulatingvalve of the first-order constant value control system.

Description

technical field [0001] The invention relates to a fault diagnosis method and system for a regulating valve, in particular to a fault diagnosis method and system for a regulating valve of a first-order fixed value control system, belonging to the field of process control and fault diagnosis. Background technique [0002] Research on data-driven fault diagnosis methods has attracted more and more attention from researchers in related fields. Most of the traditional fault diagnosis methods are based on the research object model to complete the fault diagnosis. This method needs to understand the mechanism of the research object and establish a mathematical model. For complex and special objects, it is sometimes difficult to establish an accurate mathematical model, it is difficult to ensure the accuracy of fault diagnosis, and the model is not universal. Data-driven fault diagnosis treats the system as a black box, no longer needs to know the precise mathematical model of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0245
Inventor 那文波高宇李明
Owner CHINA JILIANG UNIV
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