Purpose

This paper aims to investigate the problem of attitude control for a horizontal takeoff and horizontal landing reusable launch vehicle.

Design/methodology/approach

In this paper, a predefined-time attitude tracking controller is presented for a horizontal takeoff and horizontal landing reusable launch vehicle (HTHLRLV). Firstly, the attitude tracking error dynamics model of the HTHLRLV is developed. Subsequently, a novel sliding mode surface is designed with predefined-time stability. Furthermore, by using the proposed sliding mode surface, a predefined-time controller is derived. To compensate the external disturbances or model uncertainties, a fixed-time disturbance observer is developed, and its convergence time can be defined as a prior control parameter. Finally, the stability of the proposed sliding mode surface and the controller can be proved by the Lyapunov theory.

Findings

In contrast to other fixed-time methods, this controller only requires three control parameters, and the convergence time can be predefined instead of being estimated. The simulation results also demonstrate the effectiveness of the proposed controller.

Originality/value

A novel predefined-time attitude tracking controller is developed based on the predefined-time sliding mode surface (SMS) and fixed-time disturbance observer (FxTDO). The convergence time of the system can be selected as a prior control parameter for SMS and FxTDO.

中文翻译：

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水平起降可重复使用运载火箭的预定义时间控制

目的

本文旨在研究水平起降可重复使用运载火箭的姿态控制问题。

设计/方法/方法

在本文中，提出了一种用于水平起飞和水平着陆可重复使用运载火箭（HTHLRLV）的预定义时间姿态跟踪控制器。首先，建立了HTHLRLV的姿态跟踪误差动力学模型。随后，设计了一种具有预定义时间稳定性的新型滑模面。此外，通过使用所提出的滑模面，可以推导出预定义时间控制器。为了补偿外部扰动或模型的不确定性，开发了固定时间扰动观测器，其收敛时间可以定义为先验控制参数。最后，所提出的滑模面和控制器的稳定性可以由李雅普诺夫理论证明。

发现

与其他固定时间方法相比，该控制器只需要三个控制参数，并且收敛时间可以预定义而不是估计。仿真结果也证明了所提出的控制器的有效性。

原创性/价值

基于预定义时间滑模面（SMS）和固定时间扰动观测器（FxTDO）开发了一种新型的预定义时间姿态跟踪控制器。可以选择系统的收敛时间作为 SMS 和 FxTDO 的先验控制参数。