Intelligent sampling and detecting system with fault accommodation function

Abstract

The invention provides an intelligent sampling and detecting system with fault accommodation function. The system comprises following steps: a. a continuous linear time invariant system model comprising actuator faults and disturbance is constructed; b. an adaptive fault diagnosis observer is designed according to the continuous linear time invariant system model in step a and an error equation is constructed; c. fault and status estimation information is obtained by use of the adaptive fault diagnosis observer in step b, and according to the fault and status estimation information, an optimal output status feedback fault-tolerant controller is further designed according to the fault and status estimation information; d. non-uniform sampling data fault-tolerant control rate is designed, and a minimum sampling interval of the non-uniform sampling data is determined; e. by use of the intelligent sampling system, sampling time is obtained, the status index is guaranteed stable even if inputting in a fault system. By use of the system, accurate and timely estimation of fixed value fault can be realized, and system stability is guaranteed by use of as little sampling output as possible.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis and fault-tolerant control, and in particular relates to an intelligent sampling and detection system with adjustable faults. Background technique [0002] With the increasing complexity and size of modern engineering systems, the requirements for their safety and reliability are also getting higher and higher. Especially for some safety-oriented systems, such as aircraft and chemical equipment, etc., it is often required that the system can still operate stably in the event of a failure, and even complete the preset performance indicators. In this context, the research on fault-tolerant control of dynamic systems has received extensive attention. Among the many methods of fault-tolerant control, the fault adjustment technology is to identify and estimate the fault after it is detected, and then modify the control rate to compensate the negative impact of the fault, so that the system can...

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Problems solved by technology

Considering that time delay and packet loss often occur in the network control system, it is assumed that the sampling period is non-equal intervals. This passive non-uniform sampling method increases the difficulty of fault diagnosis and fault-tolerant control to a certain extent.

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