共查询到16条相似文献,搜索用时 140 毫秒
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本文针对一类含有非确定项的欠驱动系统提出了一种串级模糊滑模控制方法.该方法先选取状态变量中两个相关联的系统状态构造第一级滑动平面,然后将第一级滑模函数作为一个广义状态,与剩下系统状态中的一个状态构造第二级滑动平面,直到所有的系统状态都包含在内构造最后一级滑动平面.同时考虑到系统模型中存在的不确定项,利用模糊逻辑的逼近功能进行估计,文中采用Lyapunov方法求取了控制器的控制律以及模糊逼近的有关参数的自适应律.该串级模糊滑模控制器能够保证各级滑动平面的稳定性,并且在仿真实验中得到了验证. 相似文献
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《自动化仪表》2019,(9)
桥式吊车作为一种典型的欠驱动系统,已经在现代工业生产运输过程中得到了广泛的应用。但当吊车系统中的负载体积过大或吊钩质量较大时,桥式吊车系统会呈现双摆特性,增加控制难度。针对这一问题,提出了一种基于摆角约束的双摆桥式吊车轨迹规划策略,以更方便地考虑摆角约束。首先,设计能够满足摆角约束的摆角运动曲线,并由台车运动与两级摆角之间的耦合关系得出台车加速度轨迹;然后,构造关于时间和最大摆角的目标函数;最后,将轨迹规划问题转化成一个可利用粒子群算法来求解的优化问题。MATLAB仿真对比结果表明,该方法在实现台车快速精准定位的同时,能有效抑制两级摆动及残余摆动,在系统参数改变时仍具有较好的鲁棒性,可尝试应用于实际工作中。 相似文献
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针对吊车系统定位和防摆的控制要求,提出了一种基于嵌套饱和方法的非线性控制策略。对吊车系统动力学方程进行部分反馈线性化,并通过坐标变换将其转化为便于控制器设计的严格前馈级联规范型;在此基础上利用嵌套饱和非线性控制方法设计了吊车定位防摆控制器。仿真结果表明,该方法在较小的控制力作用下实现了吊车系统的定位和防摆,并且对于吊车系统参数的变化具有很强的鲁棒性。 相似文献
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针对实际桥式吊车系统物理参数不易获得的问题,提出一种基于能量守恒的参数辨识方法。该方法根据能量守恒原理建立辨识回归方程,然后用非负最小二乘法处理辨识实验数据,得到桥式吊车的控制器设计模型。以桥式吊车实验系统为背景,模拟桥式吊车的实际运行特点,进行辨识实验,获得系统的数学模型。在此基础上用LQR 控制器验证了该方法在桥式吊车实验系统上辨识结果的准确性,证明该辨识方法对桥式吊车的控制有很大帮助。 相似文献
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模糊趋近率的滑模控制在倒立摆系统中的应用研究 总被引:1,自引:0,他引:1
采用Lagrange函数建立了旋转二级倒立摆系统的状态空间方程。为了解决常规滑模控制的抖振问题,提出了一种以极点配置为基础的模糊趋近律滑模控制策略。将模糊逻辑控制与趋近律相结合,推导出模糊趋近律。仿真结果表明,该方法不仅保留了滑模控制系统具有的较强的鲁棒性,同时改善了控制系统滑动模态的品质,消除了系统的抖振。 相似文献
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H.-H. Lee 《International journal of control》2013,86(12):875-886
This paper proposes a systematic anti-swing motion-planning method for three-dimensional overhead cranes, based on the load-swing dynamics of a two-dimensional overhead crane. First, a model-following anti-swing control law is designed based on the load-swing dynamics of a two-dimensional overhead crane, where the Lyapunov stability theorem is used as a mathematical tool. Then a new anti-swing motion-planning scheme is designed for a two-dimensional overhead crane based on the model-following anti-swing control law and typical crane operation in practice. Finally, the new anti-swing motion-planning scheme is extended for a three-dimensional overhead crane, based on the geometric relationship between a three-dimensional overhead crane and its two-dimensional counterpart. As a result, the proposed method avoids solving the load-swing dynamics of a three-dimensional overhead crane which is much more complicated than that of its two-dimensional counterpart. Furthermore, the proposed method can be applied to any existing overhead cranes without increasing their actuator torque capacity. The effectiveness of the proposed method is demonstrated by generating high-performance anti-swing trajectories with high-speed long-distance load hoisting. 相似文献
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Ho-Hoon Lee 《International journal of control》2013,86(10):931-940
This paper proposes a new approach for the design of anti-swing control of overhead cranes. An anti-swing trajectory control scheme is designed based on the trolley and load-hoisting dynamics, and then extended to an adaptive scheme. The load-swing dynamics is controlled by employing a sliding surface that couples the load-swing dynamics with trolley motion. The number of degrees of freedom of the trolley and load-hoisting dynamics is the same as that of the control inputs; therefore, the control problem is reduced to finding a coupled sliding surface that stabilizes the crane control system, based on the load-swing dynamics. In this study, the Lyapunov stability theorem is used as a mathematical design tool. The proposed control guarantees asymptotic stability of the anti-swing trajectory control while keeping all internal signals bounded. The coupled sliding surface allows a direct control of the damping of load swing. In addition, the proposed control provides clear gain-tuning criteria for easy application. Finally, the proposed control realizes an anti-swing control along a typical anti-swing trajectory in practice, with high-speed load hoisting. The validity of the theoretical results is shown by computer simulation. 相似文献
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Slim Frikha Mohamed Djemel Nabil Derbel 《International Journal of Control, Automation and Systems》2018,16(2):559-565
This paper presents a new adaptive neuro-sliding mode control for gantry crane as varying rope length. This control method derived from combining the sliding surfaces of three subsystem of the gantry crane (trolley position, rope length, anti-swing) to draw out two system sliding surfaces: the trolley position with the anti-swing and the rope length and the anti-swing. On the based of the sliding mode control principle, drawn out the equivalent controller and the switching controller for gantry crane. But due to the uncertain parameters-nonlinear model of gantry crane with the bound disturbances, combining the neural approximate method, defined the neural controller and the compensation controller for the difference between the equivalent controller and the neural controller for two system control inputs: trolley position and rope length. The adaptive control laws for these controllers were deduced from Lyapunov’s stable criteria to asymptotically stabilize the sliding surfaces. Simulation studies are performed to illustrate the effectiveness of the proposed control. 相似文献
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研究不确定统一混沌系统平衡点的渐近稳定问题.利用滑模控制理论,给出了此类系统的滑模控制器的设计新方法和控制律算法.该控制器使得误差空间任一点出发的运动都在有限时间到达滑动模态,并沿切换面渐近到达原点,以达到将统一混沌系统控制到平衡点的目的.与现有文献所得结论相比,该文所设计的控制器算法具有抖振小、平稳性好和保守性小等优点.运动方程分析和仿真结果都验证了结论的有效性. 相似文献