Variable sampling NCS (Networked Control System) controller design method with packet loss and transition probability being partially unknown

Abstract

The invention discloses a variable sampling NCS (Networked Control System) controller design method with the packet loss and transition probability being partially unknown, which comprises the steps of dividing a time-varying sampling period into the sum of a constant sampling period and network-induced delay, establishing a system discrete model, and transforming the uncertainty of the sampling period into the uncertainty of system parameters; modeling a networked control system with data packet loss into a Markov jump system with four subsystems, wherein the jump probability is partially unknown, and the data packet loss is described by a Bernoulli sequence; and obtaining a sufficient condition of the stochastic stability of the system by using an analysis method of the Lyapunov stability theorem and the stochastic theory, and solving a linear matrix inequality to obtain a state feedback controller. The method disclosed by the invention considers the unstable sampling period and theunknown packet loss and transition probability of the networked control system, has the characteristics of clear design idea, high stability and sample fabrication and can be applied to the engineering practice.

Description

technical field [0001] The invention relates to a design method of a variable sampling NCS controller whose packet loss and transfer probability are partially unknown, and belongs to the technical field of network controllers. Background technique [0002] Network Control System (NCS) refers to a closed-loop control system with a network connection between actuators, sensors and controllers, a complete communication network, and a remote control system. Compared with traditional point-to-point direct control systems, network control systems are easy to install and maintain, effectively improve system reliability, reduce system volume, energy consumption and wiring, and are therefore widely used in equipment manufacturing, industrial production, transportation communications, aviation Aerospace and other control fields, but at the same time, there are problems such as network transmission delay and data packet loss in NCS. How to reasonably design the network control system ...

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Problems solved by technology

In addition, factors such as changes in computer load, influence of the network, device failure, and external interference will cause changes in the system sampling cycle, thereby affecting the stability and integrity of the system.

[0004] In the actual communication network, the network delay and packet loss are random, and it is difficult to obtain all the elements in the Markov chain transition probability matrix accurately, or it needs to pay a high cost. Generally, only the estimated value or part of it can be obtained. probability

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