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双臂空间机器人捕获航天器后的镇定运动分块滑模自适应神经网络控制 被引量:4
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作者 程靖 陈力 《中国机械工程》 EI CAS CSCD 北大核心 2017年第12期1427-1433,1441,共8页
讨论了双臂空间机器人捕获航天器后闭链混合体系统姿态和关节的受扰运动镇定控制及双臂协调操作问题。根据冲量定理及闭环约束条件,分析了双臂空间机器人捕获操作结束后受到的冲击效应,建立了闭链混合体系统动力学方程。以此为基础,针... 讨论了双臂空间机器人捕获航天器后闭链混合体系统姿态和关节的受扰运动镇定控制及双臂协调操作问题。根据冲量定理及闭环约束条件,分析了双臂空间机器人捕获操作结束后受到的冲击效应,建立了闭链混合体系统动力学方程。以此为基础,针对星载计算机运算能力有限的问题,基于神经网络控制理论设计了分块滑模自适应控制方案。将混合体系统动力学方程考虑为多个非线性关联子系统的集合,因此可同时并行地利用神经网络来分别逼近各子系统未知动力学模型,即通过并行处理来提高计算效率。设计了自适应滑模控制器来抵消交联项及神经网络逼近误差的影响。为了保证各臂杆的协同操作,基于最小权值范数法分配了各臂关节控制力矩。通过系统数值仿真验证了所提控制方案的有效性。 展开更多
关键词 双臂空间机器人 捕获操作 闭链系统 姿态关节受扰运动 分块控制 滑模自适应神经网络
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Adaptive neural network based sliding mode altitude control for a quadrotor UAV 被引量:3
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作者 Hadi RAZMI 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第11期2654-2663,共10页
Reasons and realities such as being non-linear of dynamical equations,being lightweight and unstable nature of quadrotor,along with internal and external disturbances and parametric uncertainties,have caused that the ... Reasons and realities such as being non-linear of dynamical equations,being lightweight and unstable nature of quadrotor,along with internal and external disturbances and parametric uncertainties,have caused that the controller design for these quadrotors is considered the challenging issue of the day.In this work,an adaptive sliding mode controller based on neural network is proposed to control the altitude of a quadrotor.The error and error derivative of the altitude of a quadrotor are the inputs of neural network and altitude sliding surface variable is its output.Neural network estimates the sliding surface variable adaptively according to the conditions of quadrotor and sets the altitude of a quadrotor equal to the desired value.The proposed controller stability has been proven by Lyapunov theory and it is shown that all system states reach to sliding surface and are remaining in it.The superiority of the proposed control method has been proven by comparison and simulation results. 展开更多
关键词 adaptive sliding mode controller analog neural network(ANN) altitude control of quadrotor parametric uncertainty
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