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Fault isolation method and system based on weighted residual component comparison

A technology of fault separation and weighting coefficients, applied in general control systems, control/regulation systems, test/monitoring control systems, etc., can solve problems such as less information utilization, narrow application range, and complexity

Active Publication Date: 2015-11-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is more complicated, and it makes less use of the information in the residual, and its scope of application is narrow

Method used

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  • Fault isolation method and system based on weighted residual component comparison
  • Fault isolation method and system based on weighted residual component comparison
  • Fault isolation method and system based on weighted residual component comparison

Examples

Experimental program
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no. 1 example

[0058] Such as figure 1 Shown is a method flow chart according to an embodiment of the present invention, the following reference figure 1 The present invention will be described in detail.

[0059] First, in step S110, a fault detection model of the system under test based on the residual signal is established. In this step, the linear discrete-time system equation of the system under test is established first. When the system under test is a nonlinear system, the system under test needs to be linearized. The established linear discrete-time system equation is as follows:

[0060] x k + 1 = A x k + B u k...

no. 2 example

[0096] According to another aspect of the present invention, a fault separation system based on weighted residual component comparison is also provided, and the system includes a fault detection module, a fault separation criterion establishment module and a fault separation module.

[0097] Wherein, the fault detection module is used to implement step S110, and establishes a fault detection model of the system under test based on the residual signal. The fault separation strategy building module is used to implement step S120 and step S130, obtain the offline residual function vector of the system under test based on the fault detection model, design the weighting coefficients of each component in the offline residual function vector, and use the weighting coefficient and the offline residual function vector Difference function vector design fault isolation strategy. The fault separation module is used to implement step S140 and step S150, obtain the online residual function ...

no. 3 example

[0099] The following is a specific application example with three possible faults combined with the algorithm flow figure 2 The present invention will be described in further detail. The following is a three-capacity water tank at the working point:

[0100] x p ( 1 ) = 0.4469 ( m ) , x p ( 2 ) = 0.2184 ( m ) , x p ( 3 ) = 0.3601 ( m ) ,

[0101] Take the linearization model of the model as an example for further elaboration. At this time, the static control input i...

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Abstract

The invention discloses a fault isolation method and a fault isolation system based on weighted residual component comparison. The fault isolation method comprises the steps of: establishing a fault detection model based on residual signals for a tested system; acquiring an offline residual function vector of the tested system based on the fault detection model; designing weighting coefficients of components in the offline residual function vector, and designing a fault isolation strategy by utilizing the weighting coefficients and the offline residual function vector; acquiring an online residual function vector of the tested system based on the fault detection model, and processing the online residual function vector into an online weighted residual function vector on the basis of the weighting coefficients; and achieving fault isolation based on the fault isolation strategy and the online weighted residual function vector. The fault isolation method and the fault isolation system fully utilize the information in residual, design the weighting coefficients based on the residual component and carry out weighted residual component comparison, and can better achieve the fault isolation of the tested system.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis, in particular to a fault separation method and system based on comparison of weighted residual components. Background technique [0002] The design of fault diagnosis strategy based on residual generator mainly includes three steps: residual generator design, fault detection strategy design and fault separation strategy design. In the implementation of fault diagnosis technology based on residual generator, after the system implements fault detection, it also needs to locate the fault through fault separation. [0003] The fault separation methods based on the residual generator mainly include the fault separation method based on the structured coding set, the fault separation method based on the residual contribution degree, and so on. Among them, the fault separation method based on structured coding sets utilizes the characteristics that the residuals are robust to some faults and sen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0275
Inventor 何潇周东华秦利国
Owner TSINGHUA UNIV