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Global and robust attitude control of a launch vehicle in exoatmospheric flight

机译：大气飞行中运载火箭的全局和鲁棒姿态控制

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The goal of this research is to design global and robust attitude control systems for launch vehicles in exoatmospheric flight. An attitude control system is global when it guarantees that the vehicle converges to the desired attitude regardless of its initial condition. Global controllers are important because when large angle maneuvers must be performed, it is simpler to use a single global controller than several local controllers patched together. In addition, the designed autopilots must be robust with respect to uncertainties in the parameters of the vehicle, which means that global convergence must be achieved despite of those uncertainties. Two designs are carried out. In the first one possible delays introduced by the actuator are neglected. The design is performed by using a Lyapunov approach, and the obtained autopilot is a standard proportional-derivative controller. In the second one, the effects of the actuator are considered. Then the design is based on robust backstepping which leads to a memory-less nonlinear feedback of attitude, attitude-rate, and of the engine deflection angle. Both autopilots are validated in a case study. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：这项研究的目的是为大气层飞行中的运载火箭设计一种全局的，强大的姿态控制系统。姿态控制系统在保证车辆无论其初始状态如何都能收敛到所需姿态时都是全局性的。全局控制器很重要，因为当必须执行大角度操纵时，使用单个全局控制器要比将多个本地控制器修补在一起要容易得多。另外，设计的自动驾驶仪必须在车辆参数方面具有鲁棒性，这意味着尽管存在这些不确定性，但仍必须实现全局收敛。进行两种设计。在第一个中，由执行器引起的可能的延迟被忽略。通过使用Lyapunov方法执行设计，并且获得的自动驾驶仪是标准的比例微分控制器。在第二篇中，考虑了执行器的作用。然后，该设计基于稳健的反推，从而导致姿态，姿态速率和发动机偏转角的无记忆非线性反馈。两种自动驾驶仪均在案例研究中得到验证。 （C）2018 Elsevier Masson SAS。版权所有。

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