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Second-order sliding mode attitude controller design of a small-scale helicopter

基于二阶滑模的小型直升机姿态控制器设计

Abstract

In this paper, the attitude control of a small-scale helicopter is investigated. The main rotor flapping dynamics is explicitly explored to improve the control performance. A two-layer control architecture is adopted: the inner loop controller is designed combining second-order sliding mode control with extended state observer to control the angular rates and yield good robustness properties with respect to model uncertainties; the outer loop controller is used to control the attitude. Experimental results show that the proposed controller yields excellent performance and robustness.

概要

创新点

本文将小型直升机主旋翼的挥舞动态显式地纳入到了姿态控制器设计当中, 并采用二阶滑模与扩张状态观测器相结合的方法设计了小型直升机非线性鲁棒姿态控制器. 为提高控制性能, 本文采用集总挥舞模型对挥舞动态进行近似描述, 并通过状态变化克服了挥舞角无法测量的问题. 考虑挥舞动态的旋转动力学呈现出二阶特性, 因此, 本文 采用二阶滑模与扩张状态观测器相结合的方法设计鲁棒控制器. 一方面, 滑模控制能够处理扩张状态观测器未能估计补偿的残余不确定性;另一方面, 扩张状态观测器的估计 补偿作用能够有效减小滑模控制中切换项的幅值.

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Correspondence to Shuai Tang.

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Tang, S., Zhang, L., Qian, S. et al. Second-order sliding mode attitude controller design of a small-scale helicopter. Sci. China Inf. Sci. 59, 112209 (2016). https://doi.org/10.1007/s11432-015-0153-2

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Keywords

  • small-scale helicopter
  • second-order slidingmode
  • extended state observer
  • disturbances
  • robustness

关键词

  • 小型直升机
  • 二阶滑模
  • 扩张状态观测器
  • 干扰
  • 鲁棒性