一种基于时变干扰观测器的高超声速飞行器容错控制策略设计

为了提高高超声速再入飞行器(HRV)在执行机构故障情况下的姿态控制效果,提出一种基于时变干扰观测器和参考轨迹重构器(RVG)的滑模容错控制策略.首先,设计一种新型自适应干扰观测器(ADO)来估计系统扰动,在保证估计精度的同时,能够有效削弱传统干扰观测器的初始超调现象;然后,基于反步法设计HRV的滑模控制器,在设计中引入参考轨迹重构器以避免故障突变引起的初始尖峰,并且在滑模面的设计中利用ADO所估计的系统扰动实现干扰的在线补偿.仿真结果表明,所设计的控制策略可以有效解决传统的基于高增益干扰观测器的滑模控制律受故障引起的突变和初始估计误差造成控制系统动态性能恶化的问题.

A FTC scheme for hypersonic vehicle based on adaptive disturbance observer

In order to improve the attitude control performance of the hypersonic reentry vehicle(HRV) subjected to total failures of certain actuators, the paper proposes a sliding mode fault-tolerant control(FTC) scheme which is relied on an adaptive disturbance observer(ADO) and reference vector generator(RVG). Firstly, an adaptive disturbance observer is designed to estimate the system perturbations with overshoot attenuation. Then, a back-stepping based sliding mode controller is developed combined with a reference vector generator together with the estimated perturbations, which improves superior transient performances for state tracking. Simulation results obtained on the nonlinear model of the hypersonic vehicle show that the proposed techniques can allow a faster response and minimize the overshoots compared to the linear conventional disturbance observers based sliding mode controller.