多变量连续预测控制的动态补偿*

本文利用多变量系统的频域设计方法－特征结构分解，将多变量系统分解为一组独立的ＳＩＳＯ特征子系统，对各特征子系统，通过加权补偿，由极点配置保证闭环特征子系统稳定，进而保证原闭环系统渐近稳定。     

一类非线性连续系统参数估计方法

本文提出一类非线性连续系统的参数估计方法.该方法巧妙利用不同幅值的伪随机输入 信号,从原系统中离析出线性子系统.基于线性子系统的参数估计值和集合理论,提出一个零 极点划分的寻优准则.在此准则下,实现对系统参数的估计.仿真结果表明,该方法的计算速 度较快且估值精度较高.     

多变量系统固定状态反馈下的容错极点配置

本文研究了多变量系统对执行器故障的容错极点配置问题。基于n-线性特征系数系统理论及参数空间设计方法,提出了一种容错极点配置的方法。借助这一方法,对于给定的被控对象,可以设计出一个固定的状态反馈控制律,在执行器的各种故障模式下都将系统的闭环极点设置在预定的区域内。     

多变量分数阶滞后系统预测控制参数解析调优

提出了一种针对各子系统由一阶加分数阶滞后模型描述的多变量系统模型预测控制参数解析调优方法.首先推导了多变量分数阶滞后系统的状态空间模型;其次,基于该模型构建模型预测控制优化问题,并获得了控制信号的解析表达式;再次,对闭环控制系统进行解耦分析,揭示了模型预测控制器参数与系统闭环性能间的定量关系,通过将参数调优问题转化为极点配置问题,得到能够保证闭环系统性能的模型预测控制器参数取值的解析表达式;最后通过仿真实验验证了本文所设计的参数解析调优算法的有效性.     

输出反馈系统结构及其应用

本文提出一种输出反馈控制系统闭环特征矩阵的一般结构式。根据这种结构形式,本文详细分析了闭环控制系统的可稳定性问题,并给出一种系统稳定化的充分条件,结果直观明确。其次,该文建立了逐级使子系统稳定及极点配置的原则,可以作为多变量反馈控制系统的一种设计方法,具有一定的实用价值。     

鲁棒极点配置控制系统的一种设计方法

本文提出了系统特征系数灵敏度的概念,导出了特征系数灵敏度与特征值灵敏度闻的关 系.在此基础上,提出了一种以加权特征系数灵敏度为性能指标,结构化小参数摄动下的鲁 棒极点配置控制系统的设计方法.特征系数灵敏度计算简单,目标函数的极小化采用标准的 具有二次收敛性质的参数最优化方法.     

按二次型性能指标最优设计系统的一种准解析方法

本文提出了按二次型性能指标最优设计系统的一种准解析方法。该方法首先将系统逐步分解为二阶及二阶以下子系统的组合,利用子系统参数与二次型性能指标加权阵 Q 之间的解析关系,找到了整个系统加权阵 Q、最佳反馈阵K 与闭环极点之间的解析关系,从而基本避免了在系统设计时的试凑。将该方法推广到多输入-多输出系统,为多输入-多输出系统的最佳设计提供了一种新方法。将该方法用于直流调速系统设计,其结果表明该方法用于工程设计是行之有效的。     

一种具有极点在线优化的复合自适应控制系统

极点配置自适应控制,通常存在如何选择合理的闭环极点问题。本文在极点配置控制基础上,运用优化理论并基于跟踪误差指标最小的原则,建立起一种具有极点参数在线优化的复合自适应控制方法,使系统在参数自适应的同时,实现动态响应最优化。     

奇异摄动系统主导极点配置的一种方法

本文将奇异摄动系统看成是存在参数扰动的广义系统的一种特殊形式，然后利用广义系统特征结构配置来使广义系统的有限闭环极点尽可能接近奇异摄动系统的闭环主导极点，从而达到近似配置奇异摄动系统主导极点的目的。本文提供的算法是数值稳定的。     

非线性不确定大系统的分散滑动模控制

本文研究一类非线性不确定大系统的分散滑动模控制问题．首先给出了使滑动模具有良好动态品质的分散切换流形的设计方法；然后给出了一种基于不确定因素已知变化范围的分散滑动模控制器设计方法，该方法只需对各孤立子系统进行降阶滑动模的极点配置及求解降阶Ｌｙａｐｕｎｏｖ矩阵方程即可；最后以一具体例子说明其设计过程。     

二维高速激光切割机控制系统的研究

介绍一种新型二维激光切割机控制系统。该控制系统采用上位PC和下位DSP控制板结合的方式工作，下位机采用DSP和FPGA组合方式工作。利用高速DSP的强大运算能力和FPGA的硬件实时特性，采用改进的脉冲增量插补算法计算，有效提高了激光切割机的加工速度，最高切割速度达到2 m/s。     

Optimal tracking control for nonlinear large-scale systems with persistent disturbances

This paper studies the optimal control with zero steady-state error problem for nonlinear large-scale systems affected by external persistent disturbances. The nonlinear large-scale system is transformed into N nonlinear subsystems with interconnect terms. Based on the internal model principle, a disturbance compensator is constructed such that the ith subsystem with external persistent disturbances is transformed into an augmented subsystem without disturbances. According to the sensitivity approach, the optimal tracking control law for the ith nonlinear subsystem can be obtained. The optimal tracking control law for the nonlinear large-scale systems can be obtained. A numerical simulation shows that the method is effective.     

Design of a Multibus-compatible colour graphics subsystem

Colour graphics subsystems can be used in a variety of applications such as high-end business graphics, low-end scientific computations, and for realtime display of process control diagrams. The design of such a subsystem is shown. This subsystem can be added to any Multibus-compatible microcomputer system. The use of an NEC 7220 graphics display controller chip has simplified the design to a considerable extent. CGRAM (CORE graphics on Multibus), a comprehensive subset of the CORE graphics standard package, is supported on the subsystem.     

Udwadia-Kalaba Equation Based Adaptive Robust Control for Two-wheeled Inverted Pendulum System: Underactuation and Uncertainty

A new adaptive robust control method based on Udwadia-Kalaba(U-K) approach which can be applied to the underactuated system is designed and used to a two-wheeled inverted pendulum system in this paper. We separate this typical underactuated system into two subsystems(forward subsystem and yaw subsystem), which are fully underactuated and actuated. For these different subsystems, we use different control methods. We apply an adaptive robust control method which has been proved many times to the fully actuated subsystem. Based on this adaptive robust method, a new control strategy can be redesigned and applied to the underactuated subsystem by modifying the adaptive law and other things. This adaptive robust control with a leakage-type adaptive law could guarantee the uniform boundedness and uniform ultimate boundedness of the system. Finally, the simulation is executed to demonstrate the advantage and simplicity of the proposed method.

     

Composite nonlinear feedback control for linear singular systems with input saturation

This paper investigates the composite nonlinear feedback (CNF) control technique for linear singular systems with input saturation. First, a linear feedback control law is designed for the step tracking control problem of linear singular systems subject to input saturation. Then, based on this linear feedback gain, a CNF control law is constructed to improve the transient performance of the closed-loop system. By introducing a generalized Lyapunov equation, this paper develops a design procedure for constructing the CNF control law for linear singular systems with input saturation. After decomposing the closed-loop system into fast subsystem and slow subsystem, it can be shown that the nonlinear part of the CNF control law only relies on slow subsystem. The improvement of transient performance by the proposed design method is demonstrated by an illustrative example.     

Fuzzy State-Space Modeling and Robust Observer-Based Control Design for Nonlinear Partial Differential Systems

In this paper, a robust fuzzy control design is proposed for the stabilization of nonlinear partial differential systems (NPDSs). Based on Galerkin's method, a Takagi-Sugeno (T-S) fuzzy PDS is first proposed to model an NPDS. Then, the T-S fuzzy PDS can be represented by a finite-dimensional T-S fuzzy subsystem in controlled mode and a coupled infinite-dimensional T-S fuzzy subsystem in residual mode. Therefore, the NPDS can be partitioned into a finite-dimensional T-S fuzzy slow state-space subsystem to be controlled and a coupled infinite-dimensional fast residual subsystem to be tolerated. Based on the small-gain theorem, a robust fuzzy observer-based controller is developed to tolerate the coupled residual subsystem to asymptotically stabilize the NPDS. Furthermore, based on the dissipative theory, an Hinfin control design is proposed to attenuate the effects of external disturbances and measurement noises on the robust stabilization of NPDSs. The MATLAB linear matrix inequality toolbox can be employed to efficiently solve the optimal Hinfin fuzzy observer-based control design problem of NPDSs. Finally, a simulation example is given to illustrate the design procedure and confirm the performance of the proposed robust fuzzy observer-based control method for the perturbative NPDSs.     

水上无人机自主着水控制系统设计

针对水上无人机在高海况下的着水问题,本文在分析了不同着水阶段特性的基础上,提出了一种自主着水控制系统设计方案.该方案将整个系统分为速度控制子系统和姿态控制子系统.速度控制子系统包含速度动态逆控制器和油门切换模块,姿态控制子系统包含海浪滤波器俯仰角反步控制器、高度PID控制器、俯仰角切换模块和T-S模糊推理模块.其中,海浪滤波器能有效滤除受扰姿态角中的海浪高频扰动,避免了着水之后舵面的频繁抖动;俯仰角反步控制器采用指令滤波的反步法设计,有效缓解了高海况下的舵面饱和问题.最后,在不同海况条件下进行了仿真.仿真结果表明所设计的控制系统具有良好的控制性能.     

Zero dynamics stabilisation and adaptive trajectory tracking for WIP vehicles through feedback linearisation and LQR technique

This paper presents a composite control strategy integrating adaptive sliding-mode control and the linear quadratic regulator (LQR) technology for a wheeled inverted pendulum (WIP) vehicle system. The system can be partitioned into an actuated rotational subsystem and an underactuated longitudinal subsystem based on the different control input in the mathematical model. In particular, the instability analysis of zero dynamic for the underactuated longitudinal subsystem is investigated in detail using the feedback linearisation technology. Then, an adaptive sliding-mode control is designed for the trajectory tracking, where an adaptive algorithm is developed to handle with the parameter uncertainties. In addition, the LQR technique is employed to guarantee zero dynamics stability so as to achieve simultaneously the vehicle body stabilisation at the upright position. Simulation results show the good performance and strong robustness of the proposed control schemes.     

海洋定点垂直剖面监测控制系统研制

介绍了该系统中控制子系统的设计与实现。控制子系统可分为水下监测数据采集平台和水上通讯平台两部分,分别实现水下垂直剖面监测数据的获取以及监测数据的就地存储与卫星通讯。水上、水下平台均采用接口资源丰富的AT91SAM9260作为核心芯片,以满足多种剖面数据的采集、存储以及通讯需求。实验表明,控制子系统功能完善,运行稳定,达到设计要求。     

一类受扰非线性系统存在执行器及元件故障时的容错控制

本文研究了一类受扰非线性系统存在执行器及元件故障时的镇定控制问题。新的容错控制算法不需要对执行器故障范围界值进行分析估算,因此与现存的方法相比,设计的控制策略结构更加简单,也不需要大量的在线计算。结果表明,应用所设计的控制方法,不仅保证执行器及元件故障下系统的稳定性,也能够有效抑制那些与状态相关不断增长的干扰对系统的影响。通过Lyapunov稳定性理论分析和仿真,均证明了所设计控制算法的有效性,能保证系统同时存在外界干扰、参数不确定性以及执行器/元件故障时的稳定性.