共查询到17条相似文献,搜索用时 46 毫秒
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控制受限的一类确定非完整动力学系统的镇定 总被引:1,自引:0,他引:1
利用滑动模态的方法,采用多步控制策略,对一类控制受限的不确定非完整动力学系统设计了镇定控制器,使得闭环系统的状态在有限时间内可收敛到原点的事先给定的任意小的ε领域中,最后,将该方法用于一类移动机器人的控制器设计,仿真结果验证了该方法的有效性。 相似文献
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一类不确定非完整动力学系统的时变镇定 总被引:3,自引:0,他引:3
对于一类具有未知惯性参数的非完整动力学系统,提出了新的时变自适应镇定律,将其用于一类移动机器人的位姿镇定中.仿真结果验证了所提控制方法的有效性. 相似文献
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当非完整系统只能局部转换为链式形式时, 由于存在变换奇异点集合, 针对链式系统所设计的全局反馈控制律只能局部镇定原非完整系统, 而且当期望状态接近奇异点时, 闭环系统的吸引区很小. 本文针对一类可局部转换为链式系统的非完整系统, 首先利用吸引区是状态空间中的一个不变集且与变换奇异点集不相交的条件导出了一个吸引区的不变子集, 然后给出了将系统状态从任意点驱动到吸引区不变子集内的开环控制算法, 最后结合开环控制和闭环控制得到一种混合控制算法. 该混合控制算法可以保证任意不在变换奇异点集合内的期望状态是全局渐近稳定的. 对平面两转动关节空间机器人的仿真结果证实了算法的有效性. 相似文献
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研究一类二阶非完整系统的镇定问题. 通过状态和输入反馈变换将系统模型转换为二阶链式标准型, 并对标准型给出一种时变光滑指数镇定控制律. 所得结果应用于欠驱动平面刚体的镇定. 相似文献
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不校准视觉参数的非完整运动学系统的鲁棒指数镇定 总被引:1,自引:0,他引:1
基于视觉反馈和非完整(1,2)型移动机器人的标准链式形式,探讨了具有不校准视觉参数的机器人的鲁棒镇定问题,得到了这种机器人在图像平面内新的非完整运动学系统的不确定链式模型.借助于状态缩放和切换技术,对非完整不确定链式模型提出了新的指数镇定的时变反馈控制器,并给出了指数镇定的严格证明.仿真结果验证了控制器设计的有效性. 相似文献
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A design methodology is presented for tracking control of second‐order chained form systems. The methodology separates the tracking‐error dynamics, which are in cascade form, into two parts: a linear subsystem and a linear time‐varying subsystem. The linear time‐varying subsystem, after the first subsystem has converged, can be treated as a chain of integrators for the purposes of a backstepping controller. The two controllers are designed separately and the proof of stability is given by using a result for cascade systems. The method consists of three steps. In the first step we apply a stabilizing linear state feedback to the linear subsystem. In the second step the second subsystem is exponentially stabilized by applying a backstepping procedure. In the final step it is shown that the closed‐loop tracking dynamics of the second‐order chained form system are globally exponentially stable under a persistence of excitation condition on the reference trajectory. The control design methodology is illustrated by application to a second‐order non‐holonomic system. This planar manipulator with two translational and one rotational joint (PPR) is a special case of a second‐order non‐holonomic system. The simulation results show the effectiveness of our approach. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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Time delay does not allow realizing ideal sliding mode but implies oscillations in the state variable space. An estimation technique is developed for an upper bound of oscillation amplitude induced by bounded uncertain time delay presence. 相似文献
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On discrete-time variable structure sliding mode control 总被引:1,自引:0,他引:1
The purpose of this paper is to show the limitations of discrete-time variable structure sliding mode control and that the equivalent control must be used in order to have sliding in a neighborhood of the switching surface. Conflicting requirements for the sliding mode controller behavior in the continuous and discrete-time domains are revealed and analyzed. A linear control law for an uncertain discrete-time linear plant, with bounded uncertainties, is analyzed and its superiority over nonlinear controllers is demonstrated. The conclusion of the obtained results is that in the discrete-time variable structure sliding mode controller design, unlike in the continuous-time, the designer may have limited flexibility in selecting controller architectures. 相似文献