Fault Tolerant Control Scheme for a Class of Interconnected Nonlinear Time Delay Systems Using Event-Triggered Approach

Zepeng Zhou,Zhifeng Gao,Donghao Liu

doi:10.1109/access.2020.3021722

Abstract

In this study, the event-triggered decentralized fault tolerant control (FTC) problem is investigated for a class of interconnected nonlinear time delay systems in strict feedback form with input quantization and actuator faults. The model of interconnected nonlinear time delay systems includes unstructured uncertainties and unmeasurable states. Firstly, the radial basis function neural networks (RBFNNs) are introduced to identify the unstructured uncertainties and time delay functions. An adaptive RBFNNs state observer is constructed to identify the unmeasurable states, which will be used to the design of decentralized fault tolerant controller. By utilizing the adaptive backstepping technique with low pass filter, an event-based decentralized FTC strategy is developed for the considered interconnected nonlinear systems, such that the output signals could track the reference signals, and the stability of the closed loop systems is guaranteed. Finally, the effectiveness of the designed control strategy is illustrated by a practical simulation example.

Highlights

The stability analysis and control synthesis on nonlinear systems have been greatly developed, which have expanded from a single nonlinear system to interconnected nonlinear systems with multiple subsystems interconnected [1]
Base on the above discussions, an event-triggered decentralized fault tolerant control (FTC) strategy relying on radial basis function neural networks (RBFNNs) state observer is proposed in this paper for the interconnected nonlinear time delay systems with unmeasurable states
(iii) Different from [14], [22], in which the proposed FTC schemes only consider the input quantization problem or event triggering mechanism, the FTC strategy proposed in this paper considers input quantization and event triggering mechanism, simultaneously

Summary

INTRODUCTION

The stability analysis and control synthesis on nonlinear systems have been greatly developed, which have expanded from a single nonlinear system to interconnected nonlinear systems with multiple subsystems interconnected [1]. To the best of our knowledge, there are few results on event-triggered decentralized FTC strategies for the interconnected nonlinear time delay systems with unmeasurable states, actuator faults, and input quantization. Base on the above discussions, an event-triggered decentralized FTC strategy relying on RBFNNs state observer is proposed in this paper for the interconnected nonlinear time delay systems with unmeasurable states. It overcomes the difficulties of event-triggered control caused by unstructured uncertainties, input quantization, time delay, and actuator faults.

PROBLEM DESCRIPTIONS

SIMULATION RESULTS

CONCLUSION