用于电液伺服系统故障重构的自适应超螺旋观测器
Adaptive super-twisting observer for fault reconstruction in electro-hydraulic systems
AI总结：
本文针对电液伺服系统故障重构问题，提出自适应增益超螺旋滑模观测器，通过增益自适应律抑制抖振并放宽故障与不确定性分布条件，实验验证了其精确故障重构的有效性。
摘要：
针对受到未知界有界扰动的电液伺服系统（EHSS），提出了一种自适应增益超螺旋滑模观测器用于故障重构。其目标是解决经典滑模观测器中的挑战性问题：抖振效应、观测器增益的保守性、故障与不确定性分布上的强条件。本文所提出的超螺旋滑模观测器放宽了对不确定性和故障分布的条件，且增益自适应律能够消除观测器增益过估计并衰减抖振效应。利用滑模技术的等效输出误差注入特性，提出了一种故障重构策略。给出了实验结果，验证了所提出的自适应超螺旋观测器在电液伺服系统中实现精确故障重构的有效性。
英文摘要：
An adaptive-gain super-twisting sliding mode observer is proposed for fault reconstruction in electro-hydraulic servo systems (EHSS) receiving bounded perturbations with unknown bounds. The objective is to address challenging problems in classic sliding mode observers: chattering effect, conservatism of observer gains, strong condition on the distribution of faults and uncertainties. In this paper, the proposed super-twisting sliding mode observer relaxes the condition on the distribution of uncertainties and faults, and the gain adaptation law leads to eliminate observer gain overestimation and attenuate chattering effects. After using the equivalent output-error-injection feature of sliding mode techniques, a fault reconstruction strategy is proposed. The experimental results are presented, confirming the effectiveness of the proposed adaptive super-twisting observer for precise fault reconstruction in electro-hydraulic servo systems.
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