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Event triggering mechanism-based fault detecting method for networked systems

A fault detection and event-triggered technology

Active Publication Date: 2019-08-23
苏州恒灿信息科技有限公司
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Problems solved by technology

However, when most scholars study the problem of fault detection in networked systems, they choose the discrete system as the research object. For the transmission mode in the communication network, the traditional periodic trigger mechanism with equal time intervals is mostly used. In the case of limited actual network bandwidth, Unavoidable network congestion, increased unnecessary calculations, and wasted a lot of energy and network resources

Method used

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  • Event triggering mechanism-based fault detecting method for networked systems
  • Event triggering mechanism-based fault detecting method for networked systems
  • Event triggering mechanism-based fault detecting method for networked systems

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Embodiment

[0096] By adopting the fault detection method of the networked system based on the event-triggered mechanism proposed by the present invention, the system is asymptotically stable under the condition of no external disturbance and fault. when , the faults in the system are detected by the above method. The specific implementation method is as follows:

[0097] The mathematical model of a networked motor stirring system is formula (10), where the system parameters are:

[0098]

[0099] Suppose the sensor saturation function sat(Cx(t)) can be expressed as follows:

[0100]

[0101] where the saturation value is

[0102] Based on the event trigger mechanism and considering sensor saturation constraints, assuming h=0.1, λ=0.15, σ=0.1, By solving the convex optimization problem (8), the optimal H can be obtained ∞ The performance index is γ min = 1.2105 and the corresponding trigger parameter matrix And get the optimal fault detection filter parameters

[0103] ...

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Abstract

The invention discloses an event triggering mechanism-based fault detecting method for networked systems and belongs to the field of the networked systems. The method comprises the steps of firstly, establishing a continuous time networked system model under the circumstances that sensor saturation, disturbance and fault exist, solving the problem of limited actual network bandwidth by introducingan effective event triggered communication transmission strategy, designing a fault detecting filter and introducing a residual evaluation mechanism to judge whether a system is faulty or not; obtaining sufficient conditions for the asymptotic stability of a filter error system and the existence of the fault detecting filter by adopting a Lyapunov stability theory and a linear matrix inequality analysis method; and solving an optimization problem by utilizing a Matlab LMI toolbox to obtain an optimal fault detecting filter parameter which is shown in the specification. The method disclosed bythe invention has the beneficial effects that the problems that the network bandwidth is limited, sensors are restrained by saturation and faults occur, which exist in the systems in actual situations, are considered; and the method is suitable for the general fault detection and has good universality.

Description

technical field [0001] The invention belongs to the field of networked systems, and relates to a fault detection method for a networked system based on an event trigger mechanism. Background technique [0002] The networked control system is a closed-loop control system formed by connecting the controlled object and other components through a shared communication network. Compared with traditional control systems, networked control systems have the advantages of simple connection, strong flexibility, easy expansion, and easy maintenance. However, due to the introduction of the network, it inevitably brings a series of new problems, such as information transmission delay, packet loss, quantization error and bandwidth limitation, etc., which will lead to system performance degradation, and in severe cases, the system will be unstable. Fault detection is to judge whether there is a fault in the system, and it is an important basis for the establishment of an early warning mech...

Claims

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Application Information

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IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 姜顺李尚霖潘丰
Owner 苏州恒灿信息科技有限公司
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