Research on Satisfactory Integrated Design of Event-Triggered Fault Accommodation and Network Communication Saving for NCSs With Actuator Saturation Under Non-Uniform Transmission

Yajie Li,Wei Li

doi:10.1109/access.2020.2986058

Abstract

Under the non-uniform transmission period, the satisfactory integrated design problem combining active fault-tolerant control and network communication saving was studied for nonlinear network control systems (NCSs) with actuator saturation constraints based on discrete event-triggered communication scheme (DETCS). First, the model of a non-uniform transmission closed-loop fault system was established, which includes the network attribute, actuator saturation constraints, estimation value of fault and state, event-triggered condition, disturbance information and so on. Second, the method of fault estimation with H ∞ -performance was proposed by a continuous time state observer. Furthermore, a satisfactory integrated design method integrating event-triggered fault accommodation and network communication saving was given for non-uniform transmission nonlinear NCSs with α-stability and H ∞ /H 2 performance. Finally, a MATLAB simulation was conducted to verify the effectiveness and feasibility of the proposed method based on a nonlinear NCS example. In order to reflect the real network transmission circumstances fully, a semi entity experimental platform was also built to verify the effectiveness and feasibility of the proposed method.

Highlights

With the increasing scale and complexity of networked control systems (NCSs), the fault-tolerance ability is no longer the luxury property of NCSs, and it will become an essential feature to ensure that the system performance is maintained under all eventualities [1]
For nonlinear NCSs with actuator saturation and continuous time-varying faults, the problem of a satisfactory integrated design combining active fault-tolerant control and network communication saving was studied in this paper
The effect of the non-uniform transmission period on the performance of the nonlinear NCSs under discrete event-triggered communication scheme (DETCS) is transformed into the time-delay of the system by applying the study method of a non-uniform sampled-data system

Summary

INTRODUCTION

With the increasing scale and complexity of networked control systems (NCSs), the fault-tolerance ability is no longer the luxury property of NCSs, and it will become an essential feature to ensure that the system performance is maintained under all eventualities [1]. Inspired by the above problems, the satisfactory integrated design problem combining active fault-tolerant control and network communication resource saving is studied in this paper based on the non-uniform sampled-data system theory for nonlinear NCSs under DETCS. Under the non-uniform transmission period, the satisfactory integrated design method combining active fault-tolerant control and network communication was presented for closed-loop failure NCSs with multi-objective constraints. The intelligent sensor and the control unit can complete their respective functions and applications independently, and communicate with each other and work together All these form a distributed implementation architecture of estimation, selection, accommodation and control, which lays the foundation of the unified architecture for the subsequent integrated design between active fault tolerant control and network communication. This method can ensure the accuracy of fault estimation, the effective saving of network communication resources and the achievement of the system performance index

DESIGN OF CONTINUOUS TIME STATE OBSERVER

ANALYSIS OF TRANSMISSION TIME-DELAY

SIMULATION AND EXPERIMENT

SIMULATION VERIFICATION

CONCLUSION