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基于混沌遗传算法的柔性机械手滑模控制器优化设计 总被引:1,自引:1,他引:1
针对柔性机械手动力学方程的非最小相位特点,本文提出一种柔性机械手的终端滑模控制方法,将关节电机转角和柔性模态变量的线性组合定义为柔性机械手系统的输出.通过输入输出线性化,将系统分解为输入输出子系统和零动态子系统.设计终端滑模控制策略,使输入输出子系统在有限时间收敛到零;利用混沌遗传算法优化控制器的设计参数,使零动态了系统在甲衡点附近渐近稳定,从而保证整个系统的渐近稳定.本文提出的方法设计过程简单,易于实现.仿真结果证明了设计的有效性. 相似文献
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柔性机械手系统为非最小相位系统, 当控制有界时, 该特性阻碍其端点位移渐近跟踪期望轨迹. 本文首先重新定义柔性机械手系统的输出, 通过输入输出线性化, 将系统分解为输入输出子系统和零动态子系统; 然后提出一种用于观测柔性模态导数的鲁棒滑模观测器, 使状态估计达到预期的指标, 解决了柔性模态导数难以获得的问题; 设计积分滑模控制策略, 使输入输出子系统在有限时间收敛到零; 选择适当的控制器参数, 使零动态子系统在
平衡点附近渐近稳定, 从而保证整个系统的渐近稳定. 本文提出的方法设计过程简单, 易于实现. 仿真结果证明了设计的有效性. 相似文献
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参数不确定柔性机械手的快速终端滑模控制 总被引:2,自引:0,他引:2
针对具有参数不确定性的柔性机械手,采用重新定义系统输出的方法,将系统分解为输入输出子系统和零动态子系统.对于输入输出子系统提出了一种递阶快速终端滑模控制策略,使得输入输出子系统在有限时间内收敛.将零动态子系统在平衡点近似线性化以选择控制器的设计参数,使零动态子系统在平衡点附近渐近稳定,从而保证了整个柔性机械手系统的渐近稳定,对系统中的不确定性具有较强的鲁棒性.仿真结果验证了所提方法的正确性. 相似文献
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针对单连杆柔性臂,提出了负载自适应模糊滑模控制与最优控制相结合的混合控制方法。首先,采用奇异摄动将系统分为慢变和快变两个子系统。然后,对慢变子系统采用负载自适应模糊滑模控制,快变子系统采用最优控制。最后,仿真结果表明,该方法不仅能实现柔性臂轨迹的快速、准确跟踪,有效地抑制弹性振动,并且对负载的变化具有强的鲁棒性。 相似文献
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参数不确定柔性机械手的终端滑模控制 总被引:2,自引:1,他引:1
针对参数不确定双臂柔性机械手系统, 提出一种基于遗传算法的终端滑模控制方法, 以实现其末端控制.基于输出重定义方法, 通过输入输出线性化, 将系统分解为输入输出子系统和内部子系统. 设计终端滑模控制策略,使输入输出子系统有限时间内收敛到零, 内部子系统变为零动态子系统; 采用遗传算法优化零动态子系统参数, 使其在平衡点附近渐近稳定. 根据Lyapunov稳定性理论算出末端输出位移的误差范围. 仿真结果证明该方法有效性. 相似文献
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介绍一种柔性机械手关节角位置控制的方法。通过利用角位置和速度传感器检测的信息,实现对双连杆柔性机械手的控制并给出了实验结果。 相似文献
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David G. Wilson Rush D. Robinett III Gordon G. Parker Gregory P. Starr 《Journal of Intelligent and Robotic Systems》2002,34(4):415-430
A method of sliding mode control (SMC) is proposed for the control of flexible, nonlinear, and structural systems. The method departs from standard sliding mode control by dispensing with generalized accelerations during the control law design. Global, asymptotic stability of rigid body motion is maintained if knowledge on the bounds of the neglected terms exists. Furthermore, this method provides damping for the measured flexible body modes. This paper investigates an augmented SMC technique for slewing flexible manipulators. A conventional sliding surface uses a first order system including a combination of error and error rate terms. The augmented sliding surface includes an enhanced term that helps to reject flexible degrees-of-freedom. The algorithms are theoretically developed and experimentally tested on a slewing single flexible link robot. The test apparatus is instrumented with a strain gauge at the root and an accelerometer attached at the tip. A DC motor and encoder are used to servo the link from an initial position to a final position. A standard cubic polynomial is employed to generate the reference trajectories. The augmented SMC algorithm showed improved performance by reducing the flexible link tip oscillations. 相似文献
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A general mobile modular manipulator can be defined as a m-wheeled holonomic/nonholonomic mobile platform combining with a n-degree of freedom modular manipulator. This paper presents a sliding mode adaptive neural-network controller for trajectory
following of nonholonomic mobile modular manipulators in task space. Dynamic model for the entire mobile modular manipulator
is established in consideration of nonholonomic constraints and the interactive motions between the mobile platform and the
onboard modular manipulator. Multilayered perceptrons (MLP) are used as estimators to approximate the dynamic model of the
mobile modular manipulator. Sliding mode control and direct adaptive technique are combined together to suppress bounded disturbances
and modeling errors caused by parameter uncertainties. Simulations are performed to demonstrate that the dynamic modeling
method is valid and the controller design algorithm is effective. 相似文献
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机械臂的动力学模型通常包含一定的结构不确定性,并受到外界未知干扰的影响。针对现有模型的不确定性特点,提出了一种基于非线性扰动观测器的自适应反演滑模控制方法,解决机械臂的轨迹跟踪控制问题。对于外界干扰,利用非线性扰动观测器进行观测补偿,无需上界先验知识;对于结构不确定性,引入反演滑模控制,同时设计自适应律,保证闭环系统的稳定性并增强系统的动态适应性。仿真结果证明,所提出的方法可以有效克服系统不确定性,降低控制输入信号的抖振,最终实现期望轨迹的快速精确跟踪。 相似文献
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Dan Zhang Jiabin Hu Jun Cheng Zheng-Guang Wu Huaicheng Yan 《IEEE/CAA Journal of Automatica Sinica》2024,11(3):661-672
This paper proposes a new global fixed-time sliding mode control strategy for the trajectory tracking control of uncertain robotic manipulators. First, a fixed-time disturbance observer(FTDO) is designed to deal with the adverse effects of model uncertainties and external disturbances in the manipulator systems. Then an adaptive scheme is used and the adaptive FTDO(AFTDO) is developed, so that the priori knowledge of the lumped disturbance is not required. Further, a new non-singular fast termin... 相似文献
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Fengning Zhang 《IEEE/CAA Journal of Automatica Sinica》2017,4(4):775-781
This paper proposes a high-speed nonsingular terminal switched sliding mode control (HNT-SSMC) strategy for robot manipulators. The proposed approach enhances the control system performance by switching among appropriate sliding mode controllers according to different control demands in different regions of the state space. It is shown that the highspeed nonsingular terminal switched sliding mode (HNT-SSM) which is the representation of different control demands and enforced by the HNT-SSMC has the property of global highspeed convergence compared with the nonsingular fast terminal sliding mode (NFTSM), and provides the global non-singularity. The simulation study of an application example is carried out to validate the effectiveness of the proposed strategy. 相似文献
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改进幂次趋近律的机械臂滑模控制律设计 总被引:1,自引:0,他引:1
针对机械臂滑模控制中存在的抖振问题,采用趋近律的方法来进行改善,在对机械臂的控制特点和常用的滑模趋近律进行分析的基础上,针对幂次趋近律的缺点,提出了一种改进的幂次趋近律,并对其趋近性能进行了分析;根据机械臂动力学模型和改进的幂次趋近律设计了相应的滑模控制策略,对其控制策略的位置跟踪特性和抖振消除能力等进行了验证;仿真结果表明,该控制策略不仅有效地抑制了机械臂滑模控制中的抖振问题,而且保证了机械臂系统对期望轨迹的快速跟踪性,具有更好的趋近特性和收敛特性。 相似文献