共查询到20条相似文献,搜索用时 281 毫秒
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jerk电路混沌系统的同步与追踪控制 总被引:2,自引:0,他引:2
针对多涡卷jerk电路混沌系统,利用误差反馈同步法以及非线性观测器对系统的同步进行了研究,并对系统的追踪控制问题,采用滑模控制方法,提出了一种混沌系统的控制方案,有效地实现了多涡卷混沌系统对给定参考信号的追踪控制.最后通过数值示例进行仿真,对文中论述进行了强有力的验证. 相似文献
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本文设计了一种基于趋近律方法的滑模控制器。趋近律方法是滑模变结构控制的一种典型控制策略。这种控制方法不仅可以对系统在切换面附近或沿切换面的滑模运动段进行分析,而且可以有效地对系统趋近段的动态过程进行分析和设计,从而保证系统在整个状态空间内具有较好的运动品质。仿真结果表明,将两种典型的趋近律滑模控制方法应用到台车式倒立摆系统中,指数趋近律滑模变结构方法有更好的稳定性和抗干扰能力。 相似文献
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为满足永磁直线同步电动机(PMLSM)伺服系统高速度高精度的要求,抑制不确定性对系统性能的影响,提出一种互补滑模控制(CSMC)和迭代学习控制(ILC)相结合的控制方法.该方法结合了CSMC强鲁棒性的优点和ILC跟踪精度高的特点,以CSMC中积分滑模面为基础设计新型迭代学习律,既可利用ILC对系统未建模动态进行估计,抑制端部效应、齿槽效应和摩擦力等周期不确定性的影响,又可利用CSMC减小参数变化和外部扰动等非周期不确定性对系统的影响,从而提高控制器的收敛速度和收敛精度,保证系统具有较强的速度跟踪性能.实验结果表明,该方法有效地提高了系统的动态响应能力,改善了速度跟踪精度. 相似文献
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研究具有状态依赖脉冲控制的无公害害虫管理模型,利用微分方程几何理论中后继函数法得到系统阶一周期解存在的充分条件,证明该周期解是轨道渐近稳定的,并对系统进行了数值模拟。 相似文献
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本文提出了一种基于滑模变结构控制原理的无位置传感器控制方法。通过分析永磁同步电机的模型,应用滑模变结构控制原理,提出了一种针对永磁同步电机的无位置传感器控制策略。它利用电机中容易测得的定子电流、直流母线电压,通过滑模变结构控制原理来估算转子位置。利用Matlab/Simulink对系统进行了仿真,仿真结果表明,转子位置估算结果基本与实际位置一致。 相似文献
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研究海上石油平台的电力系统抑制自励磁优化控制问题,当海上石油平台孤岛电力系统黑启动时,由于海缆距离长、分布电容大,易造成发电机的自励磁现象,对系统的电气设备产生极大危害,影响了系统的安全。而应用在陆地电力系统的抑制自励磁措施并不能在孤岛电力系统中完全有效。针对海上石油平台电力系统的特点,提出三种应用在海上油田群电力系统的抑制自励磁方法,即双机带空载海缆黑启动、防止新接入的海缆长度超过临界长度以及并联电抗器黑启动。首先通过同步发电机电枢反应原理分析了同步发电机产生自励磁现象,以劳斯判据来确定产生同步自励磁时发电机参数的判断依据及条件,对某海上油田群电力系统的自励磁情况提出抑制模型,最后利用PSCAD/EMTDC软件对黑启动方案进行仿真,结果证明了方法的有效性,为设计提供了可靠依据。 相似文献
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The saturation of linear controllers produces the undesirable existence of equilibrium points or periodic orbits of the closed-loop system. This typical nonlinear behavior has been observed in real systems or by means of simulation of certain examples. However, there are only a few studies in which the properties of saturated systems have been examined rigorously and, a proof of the existence of periodic orbits created by the saturation of the controller is lacking. In this paper we choose an example of an open-loop stable linear control system with an stabilizing saturated linear feedback to prove rigorously the existence of a periodic orbit. 相似文献
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Chaotic attractors of discrete-time neural networks include infinitely many unstable periodic orbits, which can be stabilized by small parameter changes in a feedback control. Here we explore the control of unstable periodic orbits in a chaotic neural network with only two neurons. Analytically, a local control algorithm is derived on the basis of least squares minimization of the future deviations between actual system states and the desired orbit. This delayed control allows a consistent neural implementation, i.e. the same types of neurons are used for chaotic and controlling modules. The control signal is realized with one layer of neurons, allowing selective switching between different stabilized periodic orbits. For chaotic modules with noise, random switching between different periodic orbits is observed. 相似文献
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Chen G Mischaikow K Laramee RS Pilarczyk P Zhang E 《IEEE transactions on visualization and computer graphics》2007,13(4):769-785
Design and control of vector fields is critical for many visualization and graphics tasks such as vector field visualization, fluid simulation, and texture synthesis. The fundamental qualitative structures associated with vector fields are fixed points, periodic orbits, and separatrices. In this paper, we provide a new technique that allows for the systematic creation and cancellation of fixed points and periodic orbits. This technique enables vector field design and editing on the plane and surfaces with desired qualitative properties. The technique is based on Conley theory, which provides a unified framework that supports the cancellation of fixed points and periodic orbits. We also introduce a novel periodic orbit extraction and visualization algorithm that detects, for the first time, periodic orbits on surfaces. Furthermore, we describe the application of our periodic orbit detection and vector field simplification algorithms to engine simulation data demonstrating the utility of the approach. We apply our design system to vector field visualization by creating data sets containing periodic orbits. This helps us understand the effectiveness of existing visualization techniques. Finally, we propose a new streamline-based technique that allows vector field topology to be easily identified. 相似文献
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研究了具有不确定项的非线性Willis环上脑动脉瘤系统的混沌控制和同步问题,提出了一种自适应模糊滑模变结构控制方法,设计了模糊滑模变结构控制器及自适应控制律,并从理论上证明了控制系统的稳定性。在该控制器的作用下,受控Willis脑动脉瘤系统能够达到任意目标轨道,且不受不确定性的影响,具有很强的鲁棒性。定值跟踪和同步控制的仿真结果表明了控制器的有效性。 相似文献
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The paper develops a unified feedback control law for n degree-of-freedom biped robots with one degree of underactuation so as to generate periodic orbits on different slopes. The periodic orbits on different slopes are produced from an original periodic orbit, which is either a natural passive limit cycle on a specific slope or a stable periodic walking gait on level ground generated with active control. First, inspired by the controlled symmetries approach, a general result on gait generation on different slopes based on a periodic orbit on a specific slope is obtained. Second, the time-scaling control approach is integrated to reproduce geometrically same periodic orbits for biped robots with one degree of underactuation. The degree of underactuation is compensated by one degree-of-freedom in the temporal evolution that scales the original periodic orbit. Necessary and sufficient conditions are investigated for the existence and stability properties of periodic orbits on different slopes with the proposed control law. Finally, the proposed approach is illustrated by two kinds of underactuated biped robots: one has a passive gait on a specific ground slope and the other does not have a natural passive gait. 相似文献
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Hoda Sadeghian Hassan Salarieh Aria Alasty Ali Meghdari 《Computers & Mathematics with Applications》2011,62(3):1482-1491
In this paper the problem of controlling unstable fixed points (in discrete systems) and periodic orbits (in continuous system) is investigated via a new scheme involving fractional derivatives. This method is based on applying feedback of measured states and using the period of fixed points and periodic orbits. In this method there is no need of information for fixed point and periodic orbits, just the period is enough. The effectiveness of this method is investigated via some demonstrative example. 相似文献
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This paper proposes a robust control method based on sliding mode design for two-level quantum systems with bounded uncertainties. An eigenstate of the two-level quantum system is identified as a sliding mode. The objective is to design a control law to steer the system’s state into the sliding mode domain and then maintain it in that domain when bounded uncertainties exist in the system Hamiltonian. We propose a controller design method using the Lyapunov methodology and periodic projective measurements. In particular, we give conditions for designing such a control law, which can guarantee the desired robustness in the presence of the uncertainties. The sliding mode control method has potential applications to quantum information processing with uncertainties. 相似文献
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On control of chaos: Higher periodic orbits 总被引:3,自引:0,他引:3
In this paper, we consider control and simultaneous stabilization of chaotic dynamical systems onto higher periodic orbits. Our aim is to control chaos using local linear state, feedback control. After analysing the applicability of such a control, we present numerical techniques for constructing effective controllers. The control is achieved using small, bounded perturbations. We also give a sufficient condition for stabilizing control around higher periodic orbits. The methods proposed are shown to be effective for some examples even in the presence of relatively small random dynamical noise. 相似文献