This article is concerned with the adaptive output‐feedback control of switched nonstrict feedback nonlinear systems. By introducing a novel error surface, an adaptive control strategy is proposed for the general case where the nonlinear functions and the control gain functions are unknown, and the states are unmeasurable. The considered switched nonlinear system contains unknown actuator failures, which are modeled as both loss of effectiveness and lock‐in‐place. In order to improve the transient performance in the presence of unknown actuator failures, the prescribed performance approach is used. The “explosion of complexity” problem is avoided through using low‐pass filters. The stability of the closed‐loop system under arbitrary switching is shown using Lyapunov stability theory, based on which, the tracking error is shown to converge to a small residual set with the prescribed performance bounds. The advantages of the proposed technique are verified through simulations of two numerical and practical examples.

中文翻译：

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具有执行器故障的开关非严格反馈非线性系统具有规定性能的自适应控制器设计

本文涉及开关非严格反馈非线性系统的自适应输出反馈控制。通过引入新颖的误差面，针对非线性函数和控制增益函数未知，状态不可测的一般情况，提出了一种自适应控制策略。所考虑的切换非线性系统包含未知的执行器故障，其建模为有效性损失和就地锁定。为了在执行器故障未知的情况下提高瞬态性能，使用了规定的性能方法。通过使用低通滤波器可以避免“复杂性爆炸”问题。利用Lyapunov稳定性理论显示了任意切换下闭环系统的稳定性，基于该理论，跟踪误差显示为收敛到具有规定性能边界的较小残差集。通过对两个数值和实际示例的仿真，验证了所提出技术的优势。