时滞系统的状态预测观测器及预测控制器设计

研究基于状态空间模型的时滞控制系统的状态预测观测器及最优预测控制器的设计问题。针对控制项含有时滞的系统，设计一种全维状态预测观测器，并将其用于时滞控制系统的最优状态预测反馈控制。通过该状态预测观测器可将闭环系统的时滞项移至系统闭环结构之外，从而使其优化控制规律完全可按无时滞系统进行设计。所给出的性能指标计算公式表明，该预测控制器关于二次型性能指标是次优的。     

时滞系统的降维状态预测观测器及预测控制器设计

研究控制项含有时滞的线性系统的预测控制问题.利用被控对象的预测输出向量和系统的控制向量,设计了一种降维状态预测观测器,并将该状态观测器用于时滞控制系统的最优状态反馈控制中.利用该状态预测观测器可将闭环系统的时滞项移至系统闭环结构之外,从而最优控制规律完全可以按无时滞系统进行设计.由性能指标计算公式表明,该预测控制器关于二次型性能指标是次优的.     

大型空间结构的动态输出变结构控制*

本文研究大型柔性空间结构作单轴大角度操纵时的状态估计及变结构控制方法。建立指数律的状态观测器实现了以较少传感器估计系统弹性振动模态的目的。利用状态观测器状态及系统输出变量反馈方法设计了大型空间结构的动态输出变结构控制律,针对一个实际模型仿真计算,得到了满意的结果。     

线性时滞系统的状态观测器设计及其分离性讨论

根据控制和观测间的对偶性，论证了“通过对偶系统控制器的设计来获得线性时滞系统的状态观测器”这一方法的可行性，并就一工业实例作了计算机仿真。另外，对含状态观测器、并具线性状态估计值反馈结构的闭环系统的分离性作了探讨。     

不确定LTI-SISO系统的低通滤波时滞观测器控制

合理利用时滞可能获得意想不到的性能.研究表明,系统的不确定性以及受到的外部 干扰可以利用时滞观测器来进行观测,从而实现系统的鲁棒控制.本文提出了一种低通滤波时 滞观测器.避免了常规时滞观测器控制中出现的控制信号颤振,得到了一种结构新颖的控制器. 仿真结果表明时滞观测器控制系统可以很好地抑制系统的不确定性以及受到的外部干扰,是一 种性能优良的鲁棒控制方法.     

非线性系统的变结构控制及其实现问题

本文研究一般的多变量非线性系统的变结构控制及其实现问题,给出了滑动模态存在的必要条件和充分条件,证明了当采用具有等速趋近律的变结构控制策略时,用状态观测器来实现变结构控制,对线性(一类非线性)系统,可以保证系统的状态全局(局部)无限趋近于滑动子空间(子流形)。     

状态和控制输入不确定时滞系统基于观测器的鲁棒H_∞控制

研究一类同时存在状态和控制输入不确定性的时滞系统基于观测器的鲁棒Ｈ∞控制问题。系统的不确定性参数是时变的,但其结构已知。通过构造观测器并利用观测器状态进行反馈控制,使系统不仅鲁棒镇定,而且具有一定的Ｈ∞性能。鲁棒Ｈ∞控制器的设计可通过求解两个代数Ｒｉｃｃａｔｉ方程得到     

状态和控制输入不确定时滞系统基于观测器的鲁棒H∞控制

研究一类同时存在状态和控制输入不确定性的时滞系统基于观测器的鲁棒Ｈ∞控制问题。系统的不确定性参数是时变的,但其结构已知。通过构造观测器并利用观测器状态进行反馈控制,使系统不仅鲁棒镇定,而且具有一定的Ｈ∞性能,鲁棒Ｈ∞控制器的设计可通过求解两个代数Ｒｉｃｃａｔｉ方程得到。     

不确定变时滞系统的状态观测器与基于观测是器的鲁棒控制器设计

研究了具有变时滞的不确定系统的状态观测器和基于观测器的鲁棒控制器设计问 题,其中不确定性是时变的,不要求满足匹配条件.通过构造增广系统,利用线性矩阵不等式 (LMI)方法,获得了该不确定系统存在状态观测器和基于观测器的鲁捧控制器的充分条件, 同时给出了相应的状态观测器和基于观测器的鲁棒控制器.     

基于观测器的不确定动态时滞系统鲁棒镇定的Riccati方程方法

本文给出了一类不确定动态时滞系统基于观测器的鲁棒镇定方法，该类系统的状态、输人和输出矩阵均含有不确定性，且不确定性需满足给定的匹配条件，系统不仅有状态时滞，还有控制时滞，该方法通过求解两个代数Riccati方程实现，本文比较全面地解决了满足匹配条件的不确定动态时滞系统的鲁棒镇定问题．     

Switching observer design for uncertain nonlinear systems

The problem of designing a switching observer for a finite or infinite set of nonlinear time-varying systems with unknown parameters and/or varying structure is studied in this paper. Under a compactness condition and a Lyapunov detectability assumption, it is shown that a switching observer with asymptotically stable error dynamics can be constructed. Different from the variable structure control method, only a finite number of switches occur before the asymptotic stability is achieved. The Lyapunov direct method is used to construct both the switching gain and the switching index. The special case where the error dynamics becomes exponentially convergent with quadratic Lyapunov detectability is also examined to illustrate the proposed observer design procedure     

Lyapunov stability analysis of second-order sliding-mode control and its application to chattering reduction design

This paper proposes a new sliding mode control design with reduced control chattering. The proposed new design inherits the design concept from dynamic sliding mode control, in which the first-order time derivative of the control input is treated as the control variable for a chattering control design. Previous dynamic sliding mode designs require an extra uncertainty observer or uncertainty estimator to construct the sliding surface. This paper is able to waive such observer or estimator.     

转炉炉口微差压滑模变结构控制技术

针对宝钢梅山炼钢厂转炉煤气回收系统(OG系统)的工作现状以及转炉炉口微差压控制系统对象的非线性、时变、不确定性和干扰大的特点,采用具有强鲁棒性的滑模变结构控制策略,以克服系统的不确定性和增强抗干扰能力.对滑模变结构控制算法中存在的"抖振"问题,探讨了基于干扰观测补偿的滑模控制器的设计解决方案,通过仿真研究表明滑模变结构控制方法具有很强的鲁棒性,可有效地改善控制系统的动态响应品质.     

Output feedback stabilisation for a cascaded wave PDE-ODE system subject to boundary control matched disturbance

In this paper, we consider output feedback stabilisation for a wave PDE-ODE system with Dirichlet boundary interconnection and external disturbance flowing the control end. We first design a variable structure unknown input type state observer which is shown to be exponentially convergent. Then, we estimate the disturbance in terms of the estimated state, an idea from active disturbance rejection control. These enable us to design an observer-based output feedback stabilising control to this uncertain PDE-ODE system.     

Computer control of a double inverted pendulum

A double inverted pendulum is successfully stabilized at the upright position by using a computer control. The control system is designed based on the state space approach by using a computer aided design program named CADOS developed for this purpose. CADOS was used not only for the analysis and design, but also for the simulation to evaluate the designed system. The controller designed consists of the state variable feedback and the observer. The state variable feedback is determined based on either pol-locations or as the optimal control for the quadratic criterion function. As the observer, the minimal order state observer or a linear functional observer is employed, and it is theoretically proved that the linear functional observer for a multiple inverted pendulum can always be realized by the first order. The designed controller is implemented in the mini-computer used for CADOS and could work satisfactorily. The controller using a linear functional observer requires less computation time and controls the system in more stable way.     

不确定随机非线性系统自适应观测器设计

考虑带非参数不确定项的随机非线性系统自适应观测器设计问题.不同于已有结果,系统的不确定项无需满足Lipschitz连续性条件,也不必要仅仅是系统输出的函数.通过设计一个带参数自适应律的非线性观测器来重构系统状态,该观测器结构简单目易于实现.应用Lyapunov稳定性理论和随机微分理论证明该观测器是最终有界的,并且它的界可以通过选取适当的参数进行调节.最后,数值仿真结果表明了该观测器的有效性.     

An Adaptive and Optimized Switching Observer for Sensorless Control of an Electromagnetic Valve Actuator in Camless Internal Combustion Engines

In this paper, the design and operation of a special electromagnetic actuator as a variable engine valve actuator are presented. Further, this paper describes a feasible approximated velocity switching estimator based on measurements of current and input voltage to achieve sensorless control. The proposed concept allows a reduced‐order observer to be conceived and yields a specific control strategy with an acceptable performance. In general, this approach represents a viable strategy to build reduced‐order observers for estimating the velocity of systems through the measurement of input current and voltage. The robustness of the velocity tracking is explored using a minimum variance approach. The effect of the noise is minimized, and the position can be achieved through an adaptive and optimized structure by combining this particular velocity estimator and an observer based on the electromechanical system. Position control is achieved through an inversion of the model. This approach avoids a more complex structure for the observer and yields an acceptable performance as well as eliminating bulky position‐sensor systems. In addition, a control strategy is presented and discussed. Computer simulations of the sensorless control structure are presented in which the positive effects of the observer with optimized parameter setting are visible in the closed‐loop control.     

基于RBF终端滑模观测器的电机转子位置估计

无刷直流电机常采用位置传感器来检测转子位置,这会影响系统的可靠性,增加电机体积和成本。采用无位置传感器控制技术:引入终端滑模面,其具有快速收敛性和良好观测精度,可减少相位滞后问题;采用RBF神经网络来设计观测器的控制策略,将滑模变量作为神经网络输入,输出即为控制策略,简化控制结构。RBF终端滑模观测器将RBF控制与终端滑模控制的优点紧密结合,优化了控制信号,削弱了抖振现象。仿真结果表明,该观测器能快速准确地估计电机的线反电势及电机转速,系统具有良好性能,满足无刷直流电机的工作要求。     

A new controller design for a flexible one-link manipulator

A novel controller design for noncollocated flexible one-link manipulator arm tip position control based on variable structure sliding mode control is presented. Using the assumed-mode method, the plant model is derived. The discontinuous control law based on the variable structure system theory for the noncollocated manipulator tip position control is then designed. The position state variables are obtained directly from the inversion of the output submatrix multiplied by the sensor measurements. The velocity state variables are estimated through decoupled estimators-a separate first-order observer for each of the system's modes under consideration. Different sampling periods are used for the estimator and the controller. The performance of the controller is evaluated through a series of simulations, followed by an analysis of the designed control system     

具有状态观测器的网络化控制系统的设计

研究存在时变延迟和丢包的非理想网络传输情况下带状态观测器的网络化控制系统设计问题.提出一种基于分级控制结构的、具有本地状态观测器的网络化控制系统的设计方法,证明了基于分级控制结构的网络化控制系统满足分离定理的充分条件.该方法在降低系统设计难度的同时,有效改善了网络化控制系统的控制性能.数值仿真表明了所提出方法的有效性.