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Target Tracking Algorithm Using Finite-time Convergence Smooth Second-order Sliding Mode Controller for Mobile Robots 总被引:1,自引:0,他引:1
GE Lianzheng ZHAO Lijun GAO Tong State Key Laboratory of Robotics Technique System Harbin Institute of Technology Harbin China 《机械工程学报(英文版)》2011,(3):414-419
Target tracking control for wheeled mobile robot (WMR) need resolve the problems of kinematics model and tracking algorithm.High-order sliding mode control is a valid method used in the nonlinear tracking control system,which can eliminate the chattering of sliding mode control.Currently there lacks the research of robustness and uncertain factors for high-order sliding mode control.To address the fast convergence and robustness problems of tracking target,the tracking mathematical model of WMR and the target is derived.Based on the finite-time convergence theory and second order sliding mode method,a nonlinear tracking algorithm is designed which guarantees that WMR can catch the target in finite time.At the same time an observer is applied to substitute the uncertain acceleration of the target,then a smooth nonlinear tracking algorithm is proposed.Based on Lyapunov stability theory and finite-time convergence,a finite time convergent smooth second order sliding mode controller and a target tracking algorithm are designed by using second order sliding mode method.The simulation results verified that WMR can catch up the target quickly and reduce the control discontinuity of the velocity of WMR. 相似文献
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Yong Ho Choi Young Chul Kim Kil To Chong 《Journal of Mechanical Science and Technology》2007,21(12):2059-2065
The linearization of an input/output controller has been designed for an input time delay nonlinear time discretized nonlinear
system. The time discretized nonlinear model has been obtained based on Taylor-Lie series expansion method and zero order
hold assumption. The resulting control algorithm enables the time delay nonlinear system control, while the continuous time
controller cannot handle a time delay nonlinear system due to its infinite dimensionality. The performance of the proposed
controller is evaluated by using two different case studies: a Van Der Pol equation and a Continuous Stirred Tank Reactor
(CSTR) system that all exhibit nonlinear behavior and input time delay. For all the case studies, the results validate the
proposed methods. 相似文献
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针对非完整约束的轮式移动机器人WMR轨迹跟踪问题,以差速驱动式轮式移动机器人XAUT.AGV100为研究对象,对WMR的运动控制问题作了进一步的研究。本文在分析现有移动机器人运动控制方法的基础上,充分利用模糊控制和预测控制的优点,将模糊控制的思想引入到预测控制中,设计了模糊预测控制算法,并采用此方法控制自主导航小车AGV以提高其轨迹跟踪的快速性和运动的平稳性。理论仿真分析和实验研究均证明,采用所设计的模糊预测方法控制AGV,可有效提高AGV轨迹跟踪的快速性和运动平衡性。 相似文献
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This paper proposes an adaptive controller for partially known system and applies to a two-wheeled Welding Mobile Robot (WMR)
to track a reference welding path at a constant velocity of the welding point. To design the tracking controller, the errors
from WMR to steel wall is defined, and the controller is designed to drive the errors to zero as fast as desired. Additionally,
a scheme of error measurement is implemented on the WMR to meet the need of the controller. In this paper, the system moments
of inertia are considered to be partially unknown parameters which are estimated using update laws in adaptive control scheme.
The simulations and experiments on a welding mobile robot show the effectiveness of the proposed controller. 相似文献
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轮式移动机器人因具有非完整约束的不可积分性,其控制与规划等问题变得相当困难与复杂.利用SimMechanics工具,通过对轮式移动机器人平面运动的分析,建立了轮式移动机器人的运动学模型,并对其运动进行了多次的仿真,得到其运动轨迹,通过与理论轨迹的对比,验证了运动模型的正确性.该模型还提供了参数输入的接口,能够根据实际的... 相似文献
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在复杂环境的轨迹跟踪过程中,针对移动机器人不确定时延导致控制品质下降问题,提出基于五次贝塞尔(Quintic Bezier)曲线的移动机器人非时间参考轨迹跟踪控制方法。首先,利用Quintic Bezier曲线对规划路径点进行平滑,并根据连续约束进行优化,完成多段Quintic Bezier曲线的光顺拼接,获得平滑且连续的轨迹;而后以Quintic Bezier曲线参数u作为中间映射量,构建路径长度与轨迹坐标间的状态映射模型,设计移动机器人非时间运动参考量;在此基础上,根据移动机器人运动学模型,提出一种奇异点旋转映射技术,消除奇异点对轨迹跟踪控制品质的影响。实验结果说明,所用方法能提高规划路径的平滑性与连续性,增强移动机器人不确定时延跟踪控制的鲁棒性,避免了奇异点的影响。 相似文献
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在分析研究嗅觉定位理论原理的基础上,结合移动机器人技术,设计出一种能够自主完成气源定位的轮式机器人系统。该机器人系统是以Freescale半导体公司生产的16位MCU(MC9S12XDT512)为核心控制器,采用气体传感器阵列作为路径识别单元,结合轮式移动平台,配合Z字型控制搜索算法对轮式机器人进行控制完成了气体定位。在实验室现场测试中,以15 m作为起始距离,经过10次实验,误差小于5%,实现了气源定位的功能。在机器人行走机构设计上、实验方案的制定上进一步优化,则可有效地减小误差。 相似文献
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Kinematics of wheeled mobile robots on uneven terrain 总被引:1,自引:0,他引:1
This paper deals with the kinematic analysis of a wheeled mobile robot (WMR) moving on uneven terrain. It is known in literature that a wheeled mobile robot, with a fixed length axle and wheels modeled as thin disk, will undergo slip when it negotiates an uneven terrain. To overcome slip, variable length axle (VLA) has been proposed in literature. In this paper, we model the wheels as a torus and propose the use of a passive joint allowing a lateral degree of freedom. Furthermore, we model the mobile robot, instantaneously, as a hybrid-parallel mechanism with the wheel–ground contact described by differential equations which take into account the geometry of the wheel, the ground and the non-holonomic constraints of no slip. We present an algorithm to solve the direct and inverse kinematics problem of the hybrid-parallel mechanism involving numerical solution of a system of differential-algebraic equations. Simulation results show that the three-wheeled WMR with torus shaped wheels and passive joints can negotiate uneven terrain without slipping. Our proposed approach presents an alternative to variable length axle approach. 相似文献
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差速驱动式移动焊接机器人动力学建模 总被引:4,自引:1,他引:3
采用牛顿-欧拉法,分析差速驱动式移动焊接机器人系统的左右驱动轮和机器人本体对焊炬点的动力学行为.为了实现机器人本体和滑块的联合控制,进一步研究滑块的动力学行为,建立了移动焊接机器人系统完整的动力学模型.由于模型的复杂性和不确定影响因素,基于动力学模型进行控制器的设计是不切实际的.为便于控制器的设计,最后结合实际应用情况对模型进行合理简化,并转化为状态空间方程.应用Matlab对移动焊接机器人进行动力学仿真建模,模型的建立为差速驱动式移动焊接机器人的机构设计、稳定性分析以及控制器设计提供了理论依据. 相似文献
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应用系统辨识方法对轮式移动机器人转向系统的数学模型进行了研究.首先对系统施加合适的输入信号,记录系统的输出信号,并进行试验建模,最后推导出被控对象的数学模型.经过验证,辨识模型能够反映实际系统的特性,这种辨识方法是研究轮式移动机器人转向系统特性的一种可行方法. 相似文献
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Sliding mode control of two-wheeled welding mobile robot for tracking smooth curved welding path 总被引:1,自引:0,他引:1
In this paper, a nonlinear controller based on sliding mode control is applied to a two-wheeled Welding Mobile Robot (WMR)
to track a smooth curved welding path at a constant velocity of the welding point. The mobile robot is considered in terms
of dynamics model in Cartesian coordinates under the presence of external disturbance, and its parameters are exactly known.
It is assumed that the disturbance satisfies the matching condition with a known boundary. To obtain the controller, the tracking
errors are defined, and the two sliding surfaces are chosen to guarantee that the errors converge to zero asymptotically.
Two cases are to be considered : fixed torch and controllable torch. In addition, a simple way of measuring the errors is
introduced using two potentiometers. The simulation and experiment on a two-wheeled welding mobile robot are provided to show
the effectiveness of the proposed controller. 相似文献
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基于事件的控制理论研究及其应用 总被引:1,自引:0,他引:1
基于事件的规划与控制系统是以非时间运动参考变量作为系统的描述参数,其相关理论内容包括系统的稳定性分析、能控能观性分析等都需要深入研究。针对某一类输入仿射非线性系统,利用非线性系统的反馈线性化理论证明基于事件控制的能控性问题,并在此基础之上利用非线性微分几何理论的能控分布和能观协分布基本概念研究非完整约束系统的基于事件控制的能控能观性问题。以两轮差动移动机器人为应用对象,进行相关分析工作。进行仿真,比较基于时间控制和基于事件控制的方法在时延系统中的控制效果,仿真结果表明基于事件控制能有效地克服系统随机时延带来的影响,在时延系统中明显优于基于时间的控制。 相似文献
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控制机器人的运动轨迹,有助于提高四轮移动机器人工作的整体性能,提出考虑外部扰动的四轮移动机器人运动轨迹控制优化方法,利用人工势场法根据机器人运动特点规划其运动轨迹。考虑外部扰动和不确定性因素,结合低通滤波器和滑膜控制器设计运动轨迹控制器,实现四轮移动机器人运动轨迹的优化控制。实验结果表明,所提方法的轨迹控制效果好,距离误差小,稳定性高。 相似文献
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传感器是轮式移动机器人的眼睛,轮式移动机器人用它感知周围环境,并且从周围环境中获取信息,以进行下一步操作.论文介绍了控制系统中各种传感器的原理和它在移动机器人中的应用.传感器是轮式移动机器人实现自动智能化控制的重要器件.轮式移动机器人控制系统中的传感器分为外部传感器和内部传感器. 相似文献