共查询到18条相似文献,搜索用时 93 毫秒
1.
针对具有不确定性的机器人系统,为提高系统的稳态跟踪精度,提出一种非奇异终端神经滑模轨迹跟踪控制方案.控制器采用改进的非奇异终端滑模面,并基于径向基函数神经网络自适应调整控制律的切换项,不但克服了在设计中需要知道系统不确定性的上界的限制,而且平滑了控制信号.可应用Lyapunov稳定性理论证明了系统的渐近稳定性和跟踪误差的渐近收敛性.仿真结果验证了控制方法不仅能够保证机器人系统轨迹跟踪控制的快速性和鲁棒性,而且有效地削弱了抖振,可见方案是可行且有效的. 相似文献
2.
3.
4.
本文提出一种非奇异终端滑模funnel控制(NTSMFC)方法, 实现带有饱和输入电机伺服系统的指定性能跟踪控制. 根据中值定理, 非光滑饱和函数转化为放射形式, 并且应用一个简单的神经网络进行逼近和补偿. 为保证跟踪误差被限制在指定的界限内, 同时为避免构建复杂的barrier李雅普诺夫函数或逆函数, 本文采用一个新的限制变量. 然后, 构建非奇异终端滑模funnel控制器保证电机伺服系统的指定跟踪性能. 该方法无需事先已知输入饱和函数的界限等先验知识, 且基于李雅普诺夫函数设计可以保证位置跟踪误差的收敛性, 最后给出仿真对比实例证明了该方法的有效性. 相似文献
6.
余晓华 《计算机光盘软件与应用》2014,(6):37-38
作为一种代替司机实现交通自动化的重要设备,列车自动运行(ATO)系统吸引了国内外铁路工作者的广泛关注。一个高效的高速列车控制方法能够满足人民对高速列车"安全、准时、舒适和快速"的需求[1]。与传统的线性滑模控制(LSM)相比,非奇异的终端滑模控制(NTSM)能保从任何初始状态到达平衡点的时间是有限的。NTSM稳态精度高,使它特别适用于高速、高精度控制[2]。本文采用非奇异终端滑模控制和线性滑模控制实现高速列车控制,仿真结果给出了验证分析。 相似文献
7.
针对城市轨道车辆行驶中出现轮对打滑的控制问题,使用一种非奇异终端滑模控制方法,基于城轨车辆永磁同步电机数学方程,建立永磁同步电机矢量控制模型,参考非奇异终端滑模控制策略,模拟列车控制系统应对打滑的控制步骤;在Matlab环境下建立仿真模型,仿真结果表明,与传统PID控制相比,采用非奇异终端滑模控制,牵引电机可以在更短的时间内到达给定值,且对于扰动具有鲁棒性,轨道车辆在轮对发生打滑的情况下可以更快更稳定地恢复到平稳运行区. 相似文献
8.
赵天行;赵振华;颜鸿涛;曹东;祖家奎 《控制工程》2025,(6):1121-1129
针对受多源干扰和执行器故障影响的小型无人直升机复杂轨迹的跟踪问题,提出了一种全回路连续非奇异终端滑模轨迹跟踪控制方法。首先,将轨迹跟踪问题转化为内外回路的指令跟踪问题;然后,设计高阶滑模观测器对包含故障和干扰影响的集总干扰进行估计;最后,结合干扰估计信息构造复合连续非奇异终端滑模控制器,在保证控制量连续的同时,实现了轨迹跟踪误差的有限时间镇定。仿真结果表明,所提方法在执行器故障和多源干扰影响的情况下,保证了无人直升机对复杂轨迹的高精度跟踪。 相似文献
9.
10.
针对存在外部干扰、转动惯量矩阵不确定以及执行器故障的航天器姿态跟踪控制问题,本文提出了基于自适应快速非奇异终端滑模的有限时间收敛故障容错控制方案.通过引入能够避免奇异点,且具有有限时间收敛特性的快速非奇异终端滑模面,设计了满足多约束条件有限时间收敛的姿态跟踪容错控制律,利用参数自适应方法使控制器不依赖转动惯量和外部干扰的上界信息.Lyapunov稳定性分析表明:在存在外部干扰、转动惯量矩阵不确定以及执行器故障等约束条件下,本文设计的控制律能够保证闭环系统的快速收敛性,而且对执行器故障具有良好的容错性能.数值仿真校验了该控制律在姿态跟踪控制中的优良性能. 相似文献
11.
In this article, a novel robust finite-time tracking control scheme is proposed for a class of uncertain nonlinear systems subject to the model uncertainty, external disturbance, and input saturation. A barrier function based disturbance observer (BFDO) with finite-time convergence performance is developed to estimate the non-smooth nonlinear compound disturbance, which includes the uncertainty, disturbance of system and input saturation. In addition, an adaptive continuous nonsingular terminal sliding mode controller, based on the barrier function and the estimate of the BFDO is developed. The Lyapunov stability and finite-time convergence of the proposed control scheme are proved. The effectiveness and performance advantage of the proposed control scheme is demonstrated by numerical simulations and comparison with existing works. 相似文献
12.
利用神经网络和滑模控制,研究带有饱和输入的一类非线性系统。为了便于问题分析,引入饱和约束模型输出与控制输入的差值这个变量,分5种情况讨论,求得神经网络权值的在线调节律,得到保证闭环系统稳定的控制律。利用Lyapunov函数,证明了闭环系统的稳定性;仿真实验说明了算法的有效性。 相似文献
13.
This paper presents an adaptive nonsingular terminal sliding mode approach for the attitude control of near space hypersonic vehicles (NSHV) in the presence of parameter uncertainties and external disturbances. Firstly, a novel nonsingular terminal sliding surface is developed and its finitetime convergence is analyzed. Then, an adaptive nonsingular terminal sliding mode control law is proposed, which is chattering free. In the proposed approach, all parameter uncertainties and external disturbances are lumped into one term, which is estimated by an adaptive uncertainty estimation for eliminating the boundary requirement needed in the conventional control design. Subsequently, stability of the closed-loop system is proven based on Lyapunov theory. Finally, the proposed approach is applied to the attitude control design for NSHV. Simulation results show that the proposed approach attains a satisfactory performance in the presence of parameter uncertainties and external disturbances. 相似文献
14.
15.
16.
对于Buck变换器系统,考虑到实际应用中负载变动引起系统参数的不确定性,且不确定性上界无法测量的情况,本文拟采用RBF神经网络对不确定性上界进行自适应学习。针对Buck变换器输出电压的控制问题,为了避免普通滑模控制跟踪误差渐进收敛的问题,改善其动态响应速度和稳态性能,本文拟设计一种基于RBF神经网络的上界自适应的终端滑模控制器,并通过Simulink仿真验证这种方法的可行性。 相似文献
17.
Zichun Zhao;Ruijun Zhang;Xiaolei Su;Shengnan Zhang;Qin He; 《国际强度与非线性控制杂志
》2024,34(18):12286-12311
》2024,34(18):12286-12311
A neural network adaptive integral terminal sliding mode control method with input saturation is proposed for the horizontal vibration problem of high-speed elevator car systems caused by uncertainties such as guideway excitation and shaft piston wind change. First, considering the input saturation problem existing in the elevator control actuator, a class of smooth functions is introduced to approximate the nonlinearity of switching saturation, and an eight-degree-of-freedom asymmetric anti-saturation nonlinear system model of the high-speed elevator car is established; second, in order to solve the singularity problem existing in the terminal sliding-mode control, a nonlinear term is introduced into the sliding-mode design, and a neural network is utilized for the fitting of the complex unknown function, and the design of the an adaptive integral terminal sliding mode controller (AITSMC), which enables the state variables of the system to achieve finite time convergence and proves the stability of the system by using Lyapunov theory; finally, under the action of two typical guide excitations, the proposed controller is compared with the passive control and adaptive control (AC), and the results show that, after adopting the proposed control method, the vibration acceleration eigenvalue is reduced by more than 60%, which effectively suppresses the horizontal vibration of the car system and verifies the effectiveness of the proposed controller. 相似文献
18.
This paper considers the nonsingular terminal sliding mode (TSM) controller design for a nonlinear second‐order system subject to input saturation. A new nonsingular TSM manifold is constructed by integrating the conventional nonsingular TSM manifold with a saturation function. When the bound of the uncertainty is known, based on the designed TSM manifold, a saturated controller can be designed directly for the nonlinear system. When the bound of the uncertainty is unknown, a disturbance observer is first employed to estimate the uncertainty, followed by constructing a composite controller consisting of a bounded feedback controller and a forward compensator. Theoretical analysis shows that under the proposed two control methods, the states of the closed‐loop system will both converge to zero in finite time. Simulation results demonstrate the effectiveness of the proposed methods. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献