一种基于MATLAB7.1的简单直接转矩控制系统仿真

直接转矩控制是一种新型的高性能的交流调速控制技术。MATLAB是一个高性能的数值计算和可视化的仿真软件，它提供的Simulink库、S函数和电气系统模块库，给电气传动的研究带采了方便。本文根据直接转矩的控制原理，在MATLAB／SIMULINK环境下构建了一个简单直接转矩控制仿真系统，该系统能够很好地模拟真买系统，实现高效的调速系统设计。仿真结果表明所设计的系统是可行的，具有工程研究价值．     

二自由度PID调节器的内模整定方法

本文针对典型的工业过程控制对象，提出了一种二自由度PID调节器的设计方法，所设计的调节器仅有两个可调参数，而且被调参数与系统的性能直接相关，可以使系统同时具有良好的目标值跟随特性和干扰抑制特性，仿真研究结果表明了它的有效性。     

基于专家PID的径向柱塞变量泵电液伺服控制

针对电液伺服控制径向柱塞变量泵，设计了专家PID控制器，并通过计算机仿真，再现了系统跟踪阶跃信号时的系统响应。仿真结果表明，基于专家PID控制器的电液伺服控制径向柱塞变量泵具有良好的动态性能。     

基于单片机的节能型家用燃煤供暖系统设计

针对我国北方大部分农村地区冬季家庭里采用家用燃煤炉取暖时存在的问题，应用传感检测技术和单片机控制技术，设计了一套能进行供暖模式和保温模式选择的节能型家用燃煤供暖系统。完成了基于单片机的硬件设计和软件设计，并采用protues进行了系统仿真。仿真结果表明，系统具有温度测量、温度设定、温度控制、温度显示及报警等功能。通过模拟仿真，节能效果显著。     

一种二自由度内模控制方法

针对典型的工业过程控制对象，提出了一种二自由度内模控制方法，此方法可以使系统同时具有良好的目标值跟踪特性，干扰抑制特性和鲁棒性，改进了常规内模控制的不足，而且控制算法简单，参数调整方便，理论分析和仿真实验结果表明了它的有效性。     

一类不确定时滞混沌系统的输出追踪控制

对一类不确定时滞混沌系统的输出追踪控制问题进行了研究，提出了一种新的控制方法。该方法表明具有期望系统动力学行为的线性时不变系统可作为时滞沌系统输出跟踪的参考模型。然后设计了追踪控制器驱动时滞混沌的输出跟踪期望的线性系统。基于这种设计方法，被控时滞混沌系统的输出可以具有同期望的系统相同的行为。最后给出的仿真实例说明了所给方法的有效性。     

模糊控制在二次调节系统中的应用

针对液压系统参数多变，难于用一般的控制算法进行控制的特点，本文设计了一种采用具有非线性和带有可调整加权因子的FUZZY控制器，并对二次调节系统进行了仿真研究，收到了良好的控制效果。     

精密注塑成型系统中注塑参数的优化设计

以注塑成型过程仿真获得的注塑过程中模具型腔的压力数据作为注塑机系统仿真的初始压力数据，进而通过系统动力学仿真，解决了设备系统参数的优化配置问题。针对仿真计算结果，讨论了影响注塑成型过程中精密压力控制的主要因素。系统动态特性试验结果表明，注塑成型过程仿真与系统动力学动态仿真相结合的综合分析方法是实现注塑成型参数优化和开发高精度注塑成型设备的一条有效途径。     

交流调速系统的模型控制

本文利用模型控制原理讨论了交流电动机调速的一种新的控制结构和方法。计算机仿真实验表明，本文介绍的方法能克服电机自身参数变化的影响，从而使系统具有更好的性能和鲁棒性。     

超精密隔振平台的广义预测控制系统仿真分析

超精密隔振平台振动控制系统是一个带不确定干扰的非线性系统。结合广义预测控制原理提出了一种计算机数字控制方法，该方法克服了一般线性状态反馈控制系统所存在的由于模型非线性和干扰引起系统控制精度变差的缺点。所设计的控制系统能够有效地抑制空气弹簧固有的非线性、超磁致伸缩致动器的磁滞和环境振动干扰。仿真结果表明，该方法使系统具有较好的鲁棒性和控制精度。     

On the performance enhancement of self-tuning adaptive control for time-varying machining processes

This paper investigates efficient approaches to improve the performance of a self-tuning adaptive control system for time-varying machining processes. The milling process is a typical time-varying system because of variations of the cutting conditions, e.g., the change of cutting depths and variation of the cutting materials. On the other hand, the milling processes are considered as typically non-minimum phases since one or more zeros of discrete-time models of milling processes may be located outside the unit circle. In this paper, an efficient method, using the pole assignment method, is presented to design a self-tuning adaptive controller for time-varying and non-minimum phase milling processes, and an effective method to select appropriate design parameters in order to improve its performance has been proposed. Its effectiveness has been verified in experiments on controlling milling processes with varying cutting depth. The experimental results illustrate that improved control performances can be obtained using the appropriate design parameters selected according to the principles and criteria presented here.     

模糊PID控制器在电锅炉温度控制系统中的应用

电锅炉已经成为供热采暧的主要设备．它的温度控制系统由于存在非线性、大滞后以及时变性等特点,常规的PID控制器很难达到较好的控制效果。考虑到模糊控制能够对复杂的非线性、时变系统进行很好的控制。但却无法消除静态误差的特点．本文将模糊控制引入到常规PID控制中．提出了一种模糊PID参数自整定控制器。并且对电锅炉温度控制系统进行了抗扰动的实验。仿真结果表明。和常规PID控制器相比．所设计的模糊PID控制器改善了温度控制系统的动态性能。提高了系统的鲁棒性。     

Robust preview control for a class of uncertain discrete-time systems with time-varying delay

This paper proposes a concept of robust preview tracking control for uncertain discrete-time systems with time-varying delay. Firstly, a model transformation is employed for an uncertain discrete system with time-varying delay. Then, the auxiliary variables related to the system state and input are introduced to derive an augmented error system that includes future information on the reference signal. This leads to the tracking problem being transformed into a regulator problem. Finally, for the augmented error system, a sufficient condition of asymptotic stability is derived and the preview controller design method is proposed based on the scaled small gain theorem and linear matrix inequality (LMI) technique. The method proposed in this paper not only solves the difficulty problem of applying the difference operator to the time-varying matrices but also simplifies the structure of the augmented error system. The numerical simulation example also illustrates the effectiveness of the results presented in the paper.     

Auto-tuning of PID controller parameters with supervised receding horizon optimization

In this paper, a novel two-layer online auto-tuning algorithm is presented for a nonlinear time-varying system. The lower layer consists of a conventional proportional-integral-derivative (PID) controller and a plant process, while the upper layer is composed of identification and tuning modules. The purpose of the upper layer is to find a set of optimal PID parameters for the lower layer via an online receding horizon optimization approach, which result in a time-varying PID controller. Through mathematical analysis, the proposed system performance is equivalent to that of a standard generalized predictive control. Simulation and experiment demonstrate that the new method has a better control system performance compared with conventional PID controllers.     

基于ARM的温度控制系统设计与研究

针对锅炉温度具有大惯性、大滞后、非线性和时变性的特点,以模糊PID自适应控制理论为基础,设计了基于ARM9的温度控制系统.首先介绍了系统的硬件构成,然后研究了模糊PID自适应控制算法的实现,最后给出系统的仿真结果.结果表明,该控制方法大幅度提升了对非线性、滞后性系统的控制效果.     

Time-varying sliding-coefficient-based decoupled terminal sliding-mode control for a class of fourth-order systems

A time-varying sliding-coefficient-based decoupled terminal sliding mode control strategy is presented for a class of fourth-order systems. First, the fourth-order system is decoupled into two second-order subsystems. The sliding surface of each subsystem was designed by utilizing time-varying coefficients. Then, the control target of one subsystem to another subsystem was embedded. Thereafter, a terminal sliding mode control method was utilized to make both subsystems converge to their equilibrium points in finite time. The simulation results on the inverted pendulum system demonstrate that the proposed method exhibits a considerable improvement in terms of a faster dynamic response and lower IAE and ITAE values as compared with the existing decoupled control methods.     

基于直接转矩控制的变桨伺服控制系统研究

针对电动变桨伺服系统的负载扰动复杂,具有时变性和非线性的特点,运用直接转矩控制和模糊控制,设计了基于直接转矩控制的变桨伺服控制系统,并在此基础上运用MATLAB软件进行了仿真实验.该系统响应速度快,无超调,具有较高的鲁棒性,为变桨系统的软件设计提供了一定的理论依据.     

Gain-scheduled predictive extended state observer for time-varying delays systems with mismatched disturbances

In this paper, a novel control scheme for systems with input and output time-varying delays is provided in discrete-time domain. The control strategy combines predictor-like techniques with a delay-dependent gain-scheduled extended state observer. The main goal is twofold: (i) to minimize the negative effect of time-varying delays in the closed-loop performance and, (ii) to actively compensate the effect of mismatched disturbances in the controlled output. Moreover, a sufficient condition based on Linear Matrix Inequalities (LMI) is provided to obtain the maximum delay interval that ensures the stability of the closed-loop system. Finally, the achieved benefits of the proposal are shown by simulation in open-loop unstable plants, and experimentally validated in a test-bed quadrotor platform.     

Continuous higher-order sliding mode control with time-varying gain for a class of uncertain nonlinear systems

This paper presents a continuous higher-order sliding mode (HOSM) control scheme with time-varying gain for a class of uncertain nonlinear systems. The proposed controller is derived from the concept of geometric homogeneity and super-twisting algorithm, and includes two parts, the first part of which achieves smooth finite time stabilization of pure integrator chains. The second part conquers the twice differentiable uncertainty and realizes system robustness by employing super-twisting algorithm. Particularly, time-varying switching control gain is constructed to reduce the switching control action magnitude to the minimum possible value while keeping the property of finite time convergence. Examples concerning the perturbed triple integrator chains and excitation control for single-machine infinite bus power system are simulated respectively to demonstrate the effectiveness and applicability of the proposed approach.     

多元气体配气仪设计及精度分析

提出了一种基于高精度质量流量控制器的动态配气方案,并给出了系统操作时序流程图。着重阐述配制标准气体原理、配气过程中的不确定度及其改善措施。针对气体流量控制的时变非线性、难以建立数学模型的特点,采用模糊控制算法对气体流量进行控制,提高了配气精度。该系统可连续配制、并供给浓度值连续可调的多元混合标准气体。