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Roll control for single moving-mass actuated fixed-trim reentry vehicle considering full state constraints

机译:考虑全状态约束的单动量固定式重入式车辆的侧倾控制

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Moving-mass control system applies internal movable mass elements as actuators to shift the center of mass of the vehicle relative to the external aerodynamic forces to generate control torques. Although moving-mass control system provides sufficient control authority, it suffers from its nature of nonlinear and high-coupling. What's more, the design of the moving-mass control system confronts state constraints arising from two aspects: (1) physical limitation: the internal space of the vehicle is limited and the moving-mass element can not translate out of the shell; (2) performance requirements: limiting the maximum velocity of the moving-mass element can decrease the disturbances exerting on the vehicle significantly. Based on the purpose of controlling the roll attitude of a moving-mass actuated vehicle without violating any state constraint, we design a controller using integral barrier Lyapunov functionals to control the system and keep all the states bounded in the meanwhile. The backstepping procedure is adopted and the dynamic surface control scheme is applied to avoid the 'terms explosion' in that procedure. An adaptive law is proposed to diminish the influences caused by uncertainties whose boundaries are unknown. The performance of the proposed controller is illustrated by numerical simulations under various conditions. (C) 2019 Elsevier Masson SAS. All rights reserved.
机译:运动质量控制系统将内部可移动质量元素用作执行器,以使车辆的质心相对于外部空气动力移动,以产生控制扭矩。尽管运动质量控制系统提供了足够的控制权,但它具有非线性和高耦合的特性。此外,运动质量控制系统的设计面临来自两个方面的状态约束:(1)物理限制:车辆的内部空间有限,运动质量元素不能移出壳体。 (2)性能要求:限制运动质量元件的最大速度可以显着减少施加在车辆上的干扰。基于在不违反任何状态约束的情况下控制运动质量驱动车辆的侧倾姿势的目的,我们设计了一种使用积分势垒Lyapunov功能控制系统的控制器,并同时保持所有状态受限。采用了后推程序,并采用了动态曲面控制方案,以避免该程序中的“术语爆炸”。提出了一种自适应法则,以减少边界未知的不确定性所造成的影响。所提出的控制器的性能通过各种条件下的数值模拟来说明。 (C)2019 Elsevier Masson SAS。版权所有。

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