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针对一类状态不可测的单输入单输出非线性不确定系统,提出了一种基于最小二乘支持向量机(LS-SVM)的直接自适应H∞输出反馈控制方法.该方法首先设计一种误差观测器,间接地估计出系统的状态;然后利用LS-SVM构造白适应控制器,并给出了LS-SVM权向量和偏移值的在线学习规则,通过引入如控制器减弱外部干扰及LS-SVM近似误差对输出误差的影响,利用李亚普诺夫理论证明了整个闭环系统的稳定性.仿真研究表明了该控制方案的可行性和有效性. 相似文献
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针对非线性时变系统难以辨识的问题,提出了一种基于改进最小二乘支持向量机的辨识新方法。该方法在加权最小二乘支持向量机的基础上,引入用矢量基学习和自适应迭代相结合的方式得到一个小的支持向量,同时采用加权方法确定权值系数以减小训练样本中非高斯噪声的影响。通过对动态非线性时变系统的仿真,结果表明该算法具有较好的鲁棒性、支持向量稀疏性和动态建模实时性。 相似文献
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提出一类非线性系统基于最小二乘支持向量机的直接自适应控制方法.该方法采用最小二乘支持向量机构造自适应控制器,自适应控制器参数的在线调整规律由Lyapunov稳定性理论导出,并严格证明了闭环系统的渐近稳定性.仿真研究表明了此控制方案的可行性和有效性. 相似文献
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基于非线性系统的输入输出数据,辩识对象的T-S模型.提出基于遗传算法和最小二乘支持向量机的辨识方法,利用遗传算法聚类进行结构辨识,每个类代表一条规则,规则数等于类数量,类中心作为该规则的隶属度函数中心类数;同时考虑模型辨识精度,实现全局优化;参数辨识采用基于结构风险最小化的最小二乘支持向量机方法,综合考虑模型复杂度和辨识误差.仿真结果证明了算法的有效性,辨识精度高,泛化能力强. 相似文献
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一种专家智能控制器的仿真研究 总被引:1,自引:0,他引:1
该文提出一种专家智能控制器(简称为EI控制器).该控制器的参数可基于专家知识和过程参数的变化实时进行调整。仿真结果表明对于工业过程中的大纯滞后、非线性、变参数特性能获得较为满意的调节效果。 相似文献
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对于具有较大时滞,非线性和时变性特点的打样机对象(它是印染行业中的一种小型设备),常规PID控制方法往往难以达到良好的控制效果.本文将专家控制器与常规PID控制器相结合,提出了一种智能控制器结构.试验表明,与常规PID控制器相比,该控制器的控制精度有了明显的提高. 相似文献
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模糊PID在电阻加热炉温控系统中的应用 总被引:2,自引:0,他引:2
在PID控制和Fuzzy控制的基础上,提出了一种模糊自调整PID控制,并基于Matlab对电阻加热炉温控系统进行了仿真。结果表明,模糊PID控制能使系统达到良好的控制效果。 相似文献
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Xian-Ming Zhang Qing-Long Han Xiaohua Ge Derui Ding Lei Ding Dong Yue Chen Peng 《IEEE/CAA Journal of Automatica Sinica》2020,7(1):1-17
Networked control systems are spatially distributed systems in which the communication between sensors, actuators,and controllers occurs through a shared band-limited digital communication network. Several advantages of the network architectures include reduced system wiring, plug and play devices,increased system agility, and ease of system diagnosis and maintenance. Consequently, networked control is the current trend for industrial automation and has ever-increasing applications in a wide range of areas, such as smart grids, manufacturing systems,process control, automobiles, automated highway systems, and unmanned aerial vehicles. The modelling, analysis, and control of networked control systems have received considerable attention in the last two decades. The ‘control over networks’ is one of the key research directions for networked control systems. This paper aims at presenting a survey of trends and techniques in networked control systems from the perspective of ‘control over networks’, providing a snapshot of five control issues: sampled-data control, quantization control, networked control, event-triggered control, and security control. Some challenging issues are suggested to direct the future research. 相似文献
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An approach to the synthesis of control laws stabilizing motion and force in contact tasks, based on the exponential stability of the closed-loop control system, is described. When using the synthesized control laws, simultaneous stabilization of both motion and force is achieved with a preset quality of the transient responses. The task is solved in a most general form, taking into account the constraints on robot control, its position and the force of interaction of the robot and the environment, and the external perturbations and inaccuracies of the measuring sensors, when the environment dynamics is being described by nonlinear second-order differential equation, and the robot dynamics includes the third-order equations of the robot actuators dynamics. 相似文献
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Fucheng Liao Chen Jia Usman Malik Xiao Yu Jiamei Deng 《International journal of systems science》2019,50(5):1017-1027
In the fault-tolerant control theory based on model following control, the desired signal of the control system is the output of a reference system. This paper is concerned with the design of the preview controller for a class of fault systems. A composite vector is introduced by including error vector, fault system state vector and reference system state vector. Then, we derived an augmented system from the known system equation, in which the reference input has equal status with the desired signal in the traditional preview control theory. Therefore, we can use the known theory to design the preview controller for the augmented system, then the preview controller of the original fault system can be obtained by the integration method. This paper strictly discusses the connection between stabilisation and detectability of the augmented system and the corresponding characteristics of the original system. Finally, by applying this theory to a real steam generator water level control system, it is found that the actions of the reference input preview and the fault signal preview can effectively eliminate the effect of the fault signal on the water level of the steam generator. The simulation shows the effectiveness of the controller designed. 相似文献
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结合生产实际,对粗轧控制系统进行综合设计。介绍粗轧控制系统的结构,以及粗轧核心APC控制、粗轧RAWC控制和带钢SSC控制的控制思想并给出相应控制算法。 相似文献
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The implementation of a class of self-tuning controllers using a portable microcomputer system is described. The self-tuning control theory is shown to provide a variety of control objectives such as model-reference, optimal Smith prediction and the minimization of a general k-step-ahead cost-function. Hardware and software details of the portable computer, SESAME, are presented with particular reference to the use of a new high-level language, Control Basic. Studies of the application of self-tuning to the control of room-temperature, acid neutralization, and batch chemical reactors in industry are outlined. 相似文献