共查询到20条相似文献,搜索用时 15 毫秒
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Rong-Jong Wai Meng-An Kuo Jeng-Dao Lee 《Fuzzy Systems, IEEE Transactions on》2008,16(5):1232-1244
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倒立摆的双闭环选择型模糊控制设计及仿真 总被引:5,自引:0,他引:5
针对多变量、非线性、强耦合性的倒立摆系统 ,采用牛顿 -欧拉法建立了其动力学方程 ,并进行了线性化处理 ,得到了状态空间模型 ,并提出一种双闭环选择型模糊控制方案。该方案通过一个选择型开关将两个模糊控制器的工作有机地统一起来 ,实现了摆杆角度与小车位置的双重控制功能 ,而且降低了模糊控制器的设计难度。最后在MATLAB环境下进行了计算机仿真 ,仿真结果表明 ,摆杆角度和小车位置的控制过程均具有良好的动态性能和稳态性能 ,验证了建模的正确性和控制方案的有效性 相似文献
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In this paper, experimental studies of a decentralized neural network control scheme of the reference compensation technique applied to control a 2-degrees-of-freedom (2-DOF) inverted pendulum on an x - y plane are presented. Each axis is controlled by two separate neural network controllers to have a decoupled control structure. Neural network controllers are applied not only to balance the angle of pendulum, but also to control the position tracking of the cart. The decoupled control structure can compensate for uncertainties and cancel coupling effects. Especially, a circular trajectory tracking task is tested for position tracking control of the cart while maintaining the angle of the pendulum. Experimental result shows that position control of the inverted pendulum and cart is successful. 相似文献
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Traditionally, overhead crane systems are operated by humans. However, automatic operation would reduce both the risk and
the personnel costs. From the engineering viewpoint, the most important issues in crane motion are high positioning accuracy,
short transportation time, small sway angle, and high safety. Hence, stabilization control is particularly concerned. In this
paper, a novel adaptive control scheme including both the cart motion dynamics and the swing angle dynamics is designed to
ensure the stability of the closed-loop system. No system parameters are needed, and accurate position tracking as well as
minimal swing is achieved. The stability of the closed-loop system is proved via Lyapunov theory. Simulation studies and experiments
are performed to demonstrate the validity of the proposed control scheme. 相似文献
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针对自主水下航行器的路径跟踪控制问题,首先,将基于路径坐标系和虚拟向导概念建立的跟踪误差方程转换成一种新的级联系统表示形式,该级联系统由一个位置误差名义系统和与之级联的速度和航向误差子系统组成,与常规控制器求解相比,解耦了位置误差与速度和航向误差子系统;其次,利用滤波反步法对速度和航向子系统进行求解,避免了反步法对虚拟控制量解析求导引起的“计算膨胀”的不足,并通过构造辅助系统对滤波误差和输入受限下的控制量残差进行补偿,基于李雅普诺夫稳定性理论保证了速度和航向子系统的有界收敛;再次,通过级联系统理论证明闭环跟踪误差系统所有信号的一致最终有界;最后,通过仿真实验验证所提级联控制的有效性. 相似文献
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Uzair Ansari Abdulrahman H. Bajodah Mirza Tariq Hamayun 《Asian journal of control》2019,21(3):1237-1249
A robust two‐loops structured control system design for quadrotor's position/attitude trajectory tracking is proposed. The aim of the outer loop is to provide the roll/pitch tilting commands to the inner loop, which in turns generates the tilting angles that control the quadrotor's center of gravity in the horizontal plane. The outer loop utilizes Robust Generalized Dynamic Inversion (RGDI) of a prescribed asymptotically stable differential equation in the deviation function of the horizontal position coordinates from their reference trajectories. The inner loop employs an Adaptive Non‐singular Terminal Sliding Mode (ANTSM) to control the tilting angles, in addition to controlling the yaw attitude angle and the vertical position coordinate. The proposed scheme solves the singularity avoidance problems of generalized inversion and terminal sliding mode control. The stability of outer and inner loop is ensured by utilizing positive definite Lyapunov energy function for stable tracking performance against parametric variations and bounded unknown external disturbances. Numerous simulations are conducted on a six Degrees of Freedom (DoF) quadrotor model in the presence of parametric variations, un modeled dynamics, and external disturbances. 相似文献
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倒立摆的双闭环模糊控制 总被引:36,自引:3,他引:33
对倒立摆采用双闭环的模糊控制方案,内环控制倒立摆的角度,外环控制倒立摆的位置,两个模糊控制器的设计都很简单,执行时间很短。在实际倒立摆装置上的实验结果验证了该方案的可行性和良好的控制性能。 相似文献
9.
Yao Zou 《国际强度与非线性控制杂志
》2017,27(6):925-941
》2017,27(6):925-941
This paper exploits a nonlinear robust adaptive hierarchical sliding mode control approach for quadrotors subject to thrust constraint and inertial parameter uncertainty to accomplish trajectory tracking missions. Because of under‐actuated nature of the quadrotor, a hierarchical control strategy is available; and position and attitude loop controllers are synthesized according to adaptive sliding mode control projects, where adaptive updates with projection algorithm are developed to ensure bounded estimations for uncertain inertial parameters. Further, during the position loop controller development, an auxiliary dynamic system is introduced, and selection criteria for controller parameters are established to maintain the thrust constraint and to ensure the non‐singular requirement of command attitude extraction. It has demonstrated that, the asymptotically stable trajectory tracking can be realized by the asymptotically stable cascaded closed‐loop system and auxiliary dynamic system. Simulations validate and highlight the proposed control approach. Copyright © 2016 John Wiley & Sons, Ltd. 相似文献
10.
Gonzalo Partida 《Asian journal of control》2013,15(4):971-987
This article describes a new control scheme designed for a three degree of freedom (3‐DOF) flexible robot. The control scheme consists of two multi variable control loops. The inner loop is the motor's position control system, while the outer loop controls the robot tip's position, thus canceling vibrations which are originated by the structural flexibility of the manipulator during movement. As it will be shown, the outer control loop is robust to payload variations. The outer loop performance is based on a perfect cancelation of the inner loop dynamics. The effects of not achieving such perfect cancelation are also studied, and rules for designing a robust controller in this case are developed. Simulations assuming different payloads have been carried out with successful results for trajectory tracking. Trajectory tracking with a variable payload is also achieved. 相似文献
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This paper investigates the output containment tracking problem of nonlinear multiagent systems with mismatched uncertain dynamics and input saturations. A neural network–based distributed adaptive command filtered backstepping (CFB) scheme is given, which can guarantee that the containment tracking errors reach to the desired neighborhood of origin and all signals in the closed‐loop system are bounded. Note that error compensation system and virtual control laws established in CFB only use local information, so the given scheme is completely distributed. Moreover, the applied sliding mode differentiator (SMD) can make the outputs of SMD fast approximate the virtual signal and its derivative at each step of backstepping, which can further improve the control quality. Finally, a simulation example is given to show the effectiveness of the proposed scheme. 相似文献
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Robotic systems have inherently nonlinear phenomena as joints undergo sliding and/or rotating. This in turn requires that the system running states be predicted correctly. This paper makes a full analysis of the robot states by applying observer-based adaptive wavelet neural network (OBAWNN) tracking control scheme to tackle these phenomena such as system uncertainties, multiple time-delayed state uncertainties, and external disturbances such that the closed loop system signals must obey uniform ultimate boundedness and achieve H∞ tracking performance. The recurrent adaptive wavelet neural network model is used to approximate the dynamics of the robotic system, while an observer-based adaptive control scheme is to stabilize the system. The advantage of employing adaptive wavelet neural dynamics is that we can utilize the neuron information by activation functions to on-line tune the hidden-to-output weights, and the adaptation parameters to estimate the robot parameters and the bounds of the gains of delay states directly using linear analytical results. It is shown that the stability of the closed-loop system is guaranteed by some sufficient conditions derived from Lyapunov criterion and Riccati-inequality. Finally, a numerical example of a three-links rolling cart is given to illustrate the effectiveness of the proposed control scheme. 相似文献
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针对可重复使用运载器再入段的姿态控制问题,提出一种基于准连续高阶滑模的控制方法。将姿态控制系统分为两个回路,分别为角度控制回路与角速度控制回路。角度回路作为外回路产生角速度指令,角速度回路作为内回路跟踪外回路产生的角速度控制指令。为了提高系统的鲁棒性,对两个回路分别设计滑模控制器。外回路中设计基于低通滤波的终端滑模控制方法,以获得平滑的控制量作为角速度指令。内回路设计增加系统相对阶的准连续高阶滑模方法,使控制律中不直接含有符号函数项,保证系统稳定的同时减弱控制器抖振。在具有外界干扰与参数不确定的情况下,使用本文提出的方法进行仿真试验,仿真结果证明了所提出方法的有效性。 相似文献
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Multivariable finite‐time output feedback trajectory tracking control of quadrotor helicopters 下载免费PDF全文
A continuous multivariable output feedback control scheme is developed for trajectory tracking and attitude stabilization of quadrotor helicopters. The whole closed‐loop system is composed by position loop and attitude loop. The homogeneous technique is used to design finite‐time stabilizing controller and observer in each loop. The virtual control is introduced in position loop to ensure that the real control is smooth enough such that it can be tracked by attitude loop. The finite‐time stability of the closed‐loop system is guaranteed through homogeneity and Lyapunov analysis. Finally, the efficiency of the proposed algorithm is illustrated by numerical simulations. 相似文献
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针对一类含有外部扰动和执行器故障的刚体航天器姿态控制系统,提出一种基于自适应学习观测器的指定时间容错控制器的设计方案.首先,系统性地给出一种改进型自适应学习观测器设计方案,基于自适应学习观测器框架,设计航天器姿态系统的学习观测器实现对系统的综合扰动值估计;然后,利用综合扰动的估计信息和滑模控制理论设计指定时间容错跟踪控制器,使得系统的姿态角能够在指定时间跟踪指令信号,系统的收敛时间可通过容错控制器的参数预先设置,且与系统的初始状态值无关;接着,基于Lyapunov稳定性理论验证含有故障的姿态控制系统能够在指定时间内稳定;最后,通过数值仿真,与已有的观测器和有限时间控制方案进行对比,表明所提出方案的有效性和可行性. 相似文献
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A neural-network-based motion controller in task space is presented in this paper. The proposed controller is addressed as a two-loop cascade control scheme. The outer loop is given by kinematic control in the task space. It provides a joint velocity reference signal to the inner one. The inner loop implements a velocity servo loop at the robot joint level. A radial basis function network (RBFN) is integrated with proportional-integral (PI) control to construct a velocity tracking control scheme for the inner loop. Finally, a prototype technology based control system is designed for a robotic manipulator. The proposed control scheme is applied to the robotic manipulator. Experimental results confirm the validity of the proposed control scheme by comparing it with other control strategies. 相似文献
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