A Fault Diagnosis Method for Nonlinear Network Control System

A network control system and fault diagnosis technology, applied in the field of computer network, can solve the problem of low robustness of packet loss of fault sensitivity data, and achieve the effect of improving fault sensitivity and strong robustness

Active Publication Date: 2017-09-08
HUAIHAI INST OF TECH
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  • Application Information

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Problems solved by technology

The existing fault diagnosis methods for nonlinear networked control systems are not very sensitive to faults and robust to data packet loss, and cannot well complete the relevant fault diagnosis work for nonlinear networked control systems with uncertain models

Method used

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  • A Fault Diagnosis Method for Nonlinear Network Control System
  • A Fault Diagnosis Method for Nonlinear Network Control System
  • A Fault Diagnosis Method for Nonlinear Network Control System

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Experimental program
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Embodiment 1

[0045] Embodiment 1, as attached figure 2 and 3 As shown, a fault diagnosis method for a nonlinear networked control system is characterized in that it includes the following steps:

[0046] Step 1: Set the discrete model of the nonlinear network control system, which can reflect the state time delay of the nonlinear network control system and the uncertainty characteristics of the discrete model itself;

[0047] Step 2: Aiming at the discrete model in step 1, a robust fault detection filter for detecting a nonlinear networked control system with data packet loss is obtained;

[0048] Step 3: According to the discrete model in step 1, set the augmented vector, combine the augmented vector and the discrete model to obtain the residual dynamic system, and use the Lyapunov stability theory to generate the residual dynamic system;

[0049] Step 4: According to the condition that the mean square of the residual dynamic system is stable, obtain the gain matrix L and the residual we...

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Abstract

The invention relates to a fault diagnosis method of a nonlinear network control system. The fault diagnosis method comprises the following steps of setting a discrete model according to the status quo of the nonlinear network control system having state delay and model uncertainty; obtaining a robust fault detection filter of the nonlinear network control system having data packet dropout based on a method of a fault observer; setting an augmentation vector, generating a residual error dynamic system, and giving out conditions required by mean-square stability of the residual error dynamic system by means of the Lyapunov stability theory; solving for a gain matrix L and a residual error weight matrix R of the robust fault detection filter and judging whether the nonlinear network control system has faults. By means of the robust fault detection filter, fault sensitivity to the nonlinear network control system is improved greatly, strong robust on external disturbance and data packet dropout is achieved, and related fault diagnosis of the nonlinear network control system with the uncertain model can be achieved well.

Description

technical field [0001] The invention belongs to the technical field of computer network, relates to a network control system, in particular to a fault diagnosis method of a nonlinear network control system. Background technique [0002] The network control system (Network Control System) refers to the connection between the sensor of the control system to the controller and the controller to the actuator through the network. Compared with the traditional control system mode, this networked control mode has the advantages of sharing information resources, high efficiency, and high reliability, and is the development mode of the future control system. Due to the complexity of network transmission, in actual engineering applications, the requirements for the security and reliability of NCS are higher than those of general systems. Therefore, it is more urgent to study the fault diagnosis method of NCS. [0003] Existing research on networked control systems mainly focuses on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B23/02
Inventor 徐启华孟娇韩磊刘瑞明肖晓张敏
Owner HUAIHAI INST OF TECH
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