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本文简要地介绍了多变量频域法中的并矢展开法及其实用形式—近似并矢展开法,并用它设计了单元机组负荷反馈控制系统.文中就近似并矢展开的ω_1选择问题提出了简便的工程估计法,最后本文把并矢展开法与多变量频域法的其它两种主要方法作了比较,说明了并矢展开法更适合于单元机组负荷反馈控制系统的设计. 相似文献
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本文简要地介绍了特征轨迹的基本原理,讨论了特征轨迹的设计方法及并矢展开和特征轨迹相结合的设计方法,并对一典型多变量系统实例进行了分析设计,取得了较为满意的结果。 相似文献
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本文介绍了并矢展开法的基本原理,探讨了基于这种原理的设计方法和步骤,并结合一个实例进行分析设计,取得了较为满意的结果。本文还简要地讨论了一类并矢型多变量系统和化传递函数矩阵为并矢型的近似方法。 相似文献
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对于相互间存在耦合作用的非线性多变量系统,运用具有智能开关的模糊-PID复合控制器对多变量系统进行摔制,并利用Matlab/Simulirlk进行仿真。结果表明,该方法较好地实现了模糊控制器和PID控制器之间的软切换并且消除了系统的耦合作用,消除了常规多变量系统切换点的衰减振荡。 相似文献
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本文提出多变量系统部分变量前置V型解耦,部分变量后置V型解耦的设计方法。并就某电厂三输入、三输出磨煤机系统,设计解耦控制系统,给出了仿真结果。 相似文献
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从工程应用角度出发,提出一种用H∞控制理论设计一类多变量系统的次优敏感性控制
器的工程设计方法,并证明了其可行性.该方法通过将系统矩阵化为对角占优,利用单独通道
设计思想将多变量系统转化为单变量系统的H∞最优敏感性控制器问题.文末给出了仿真实
例. 相似文献
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针对多变量系统具有多时滞、强铰链耦合的特点,提出了有效开环传递函数解耦策略。由于有效开环传递函数所描述的动力学行为的复杂性,首先采用模型降阶技术,将系统逼近一阶环节+延时(FOPDT)形式;然后运用IMC控制策略实现单位反馈控制。为得到传统PID控制器的典型表达形式,将IMC控制器进行麦克劳林级数展开,通过对相应项系数的比对得到了传统PID控制器。仿真分析表明了该方法能够提高系统动态响应速度、减小稳态误差,实现了多变量耦合系统的理想控制。 相似文献
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从工程应用角度出发,提出一种用H∞控制理论设计一类多变量系统的次优敏感性控制器的工程设计方法,并证明了其可行性.该方法通过将系统矩阵化为对角占优,利用单独通道设计思想将多变量系统转化为单变量系统的H∞最优敏感性控制器问题.文末给出了仿真实例. 相似文献
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Feed-forward-feedback control of multivariable systems The overall design of a boiler control system
Consideration is given to the design of feed-forward/feedback control configurations for the class of systems described by dyadic transfer-function matrices. It is demonstrated that the system modes can be decoupled enabling the control system to be designed loop by loop. The concepts are applied to the regulation of pressure and water-level loops in a power station boiler model. Although this model is not dyadic, a modified dyadic expansion enables control systems to be designed in a similar manner. The relevance of dyadic expansions in the investigation of system structure is illustrated by a general analysis of the boiler model and their use in the investigation of the effect of modelling errors is outlined. 相似文献
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The design of a suboptimal controller for linear time invariant multivariable systems, which assigns the closed loop eigenvalues at desired locations and minimizes their sensitivity with respect to plant parameters, is outlined. The dominant open loop poles are shifted in groups employing a dyadic structure of state feedback for each group. Freedom available in choosing the constants of proportionality of the different rows of the dyadic matrices is used for eigenvalue sensitivity minimization. Since the final controller matrix is the sum of different dyadic matrices, the sensitivity of the final closed loop poles can be made less than that obtained by shifting all the dominant eigenvalues in one stage using unity rank feedback. An example illustrating the design method is given. 相似文献
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A new method for the optimization of multilevel multivariable mechanical systems is presented. The method uses finite automata theory and algorithms for optimal control. The application of the algorithmic method to the optimal control of artificial human extremities is described. 相似文献
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Research on the application of fuzzy set theory to the design of control systems has led to interest in decomposition of multivariable fuzzy systems. Decomposition of multivariable control rules is preferable since it alleviates the complexity of the problem, but the inference error is inevitable because of its approximate nature. In this paper we show that a large inference error is generated when the Gupta's decomposition method (1986) is applied to Exclusive-nor (ENOR) gate model which is used as a counter example. We define an index of applicability which can classify whether the decomposition method can be applied to a multivariable fuzzy system or not 相似文献
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针对一类不确定的非线性多变量离散时间动态系统,提出了一种基于切换的多模型自适应控制方法.该控制方法的特点在于以下两个方面:首先,引入一个高阶差分算子使得非线性系统的非线性项的限制条件不再要求全局有界;其次,提出的控制方法由线性自适应控制器、神经网络非线性自适应控制器以及切换机构组成:线性控制器用来保证闭环系统的输入输出信号有界,神经网络非线性控制器用来改善闭环系统的性能,基于性能指标的切换机构在每一时刻选择性能指标较好的控制器对系统进行控制.理论分析和仿真实验说明了提出的多模型自适应控制方法的有效性. 相似文献
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非线性系统控制的逆系统方法(Ⅱ):多变量控制理论 总被引:14,自引:0,他引:14
介绍基于逆系统方法的多变量非线性控制理论,包括高阶微分方程组系统的控制设计方法,多输入多输出状态方程系统的控制设计方法,可解耦性与可镇定性分析,应用与相关理论研究等内容。 相似文献
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This paper considers the optimization of time-varying multivariable control systems with quadratic cost function which may have time-varying weighting matrices. The problem is first formulated in the context of functional analysis which leads to the optimal control being denned by a functional equation. An approximate solution of this equation is then obtained by replacing the kernel of the equation by a double Fourier series expansion. It is shown that the resulting sub-optimal control may be made to approach the absolute optimum as closely as desired by extending the double Fourier series, and bounds on the norm of the error in the control and the cost function are derived for any finite expansion. Application of the method to a particular system shows that Chebyshev basis functions lead to a better approximation than the classic sinusoidal functions. Finally, the use of the method as an adjunct to iterative optimization based on the contraction mapping algorithm is discussed briefly. 相似文献