A closed-loop particle swarm optimizer for multivariable process controller design

Design of general multivariable process controllers is an attractive and practical alternative to optimizing design by evolutionary algorithms （EAs） since it can be formulated as an optimization problem. A closed-loop particle swarm optimization （CLPSO） algorithm is proposed by mapping PSO elements into the closed-loop system based on control theories. At each time step, a proportional integral （PI） controller is used to calculate an updated inertia weight for each particle in swarms from its last fitness. With this modification, limitations caused by a uniform inertia weight for the whole population are avoided, and the particles have enough diversity. After the effectiveness, efficiency and robustness are tested by benchmark functions, CLPSO is applied to design a multivariable proportional-integral-derivative （PID） controller for a solvent dehydration tower in a chemical plant and has improved its performances.     

基于现场控制系统的烟叶温室温度控制模型

基于温室温度控制对象存在的大滞后、大惯性等属性,使传统控制方法的控制效果不甚理想。从烟叶生长原理和温室温度控制原理出发,提出一种基于现场控制系统(FCS)的现场总线控制模型,实现对烟叶培育过程中温度的管控一体化。该模型能使温室温度控制根据季节的交替、时令的变化实现优化控制,为烟叶的生长发育提供合适的温度环境。结果表明:该控制模型可以提高温室温度控制系统的自适应性,抑制大惯性产生的温度失调等副作用,获得满意的控制效果,同时也节约能源,提高了经济效益。     

负荷控制原理综述及其在模具企业的应用

由于模具生产方式的特殊性和复杂性,当今比较成熟的生产计划技术,如MRP(Ⅱ)、JIT和OPT已经不适应模具企业的生产方式.本文对适用于模具生产的负荷控制(WLC)技术进行了综述,并就负荷控制在模具企业的应用进行了概述.     

Predictive functional control (PFC) and its application in chlorinated polyethylene process

INTRODUCTIONWiththedevelopmentofscienceandtechnol ogy ,requirementsforthesatisfactoryperformanceofthecontrolprocessesarelargelyenhanced.However,moderncontroltheorybasedonthestate spacemethodcannotmeettherequirementofthepracticalcontrolproblemduetothefactt…     

Predictive functional control (PFC) and its application in chlorinated polyethylene process

The main principle and the characteristic of Predictive Functional Control (PFC) strategy are presented in this paper and the corresponding control system aid design software APC-PFC is also introduced. For a chlorinated polyethylene (CPE) process, a design scheme of cascade predictive functional control system is described and the control performance is improved obviously. Project (No. 69974035) supported by the National Natural Science Foundation of China     

Model predictive control for adaptive cruise control with multi-objectives: comfort, fuel-economy, safety and car-following

For automated vehicles,comfortable driving will improve passengers’ satisfaction.Reducing fuel consumption brings economic profits for car owners,decreases the impact on the environment and increases energy sustainability.In addition to comfort and fuel-economy,automated vehicles also have the basic requirements of safety and car-following.For this purpose,an adaptive cruise control (ACC) algorithm with multi-objectives is proposed based on a model predictive control (MPC) framework.In the proposed ACC algorithm,safety is guaranteed by constraining the inter-distance within a safe range; the requirements of comfort and car-following are considered to be the performance criteria and some optimal reference trajectories are introduced to increase fuel-economy.The performances of the proposed ACC algorithm are simulated and analyzed in five representative traffic scenarios and multiple experiments.The results show that not only are safety and car-following objectives satisfied,but also driving comfort and fuel-economy are improved significantly.     

Predictive control of a class of bilinear systems based on global off-line models

INTRODUCTION Bilinear systems are a kind of important nonlinear systems with relatively simple structure, and many industrial processes can be described as a bilinear system. Thus research on the control of this kind of systems is very important. On the other hand, model predictive control (MPC) (Clarke et al., 1987) has been widely used in industrial applications and many predictive control methods focusing on bilinear systems are emerging (Bloemen et al., 2001; Fontes et al., 2004; He…     

电动轮椅车控制器设计的研究

本文介绍了电动轮椅车控制器的设计和执行。控制结构包含两层,即轮椅姿势和轮椅速度的控制。在高层的控制结构中,姿势控制器是作为两个轮子参考速度发生器工作的。操纵杆界面和姿势控制器都处在8位微控制器中。在低层的控制结构中,速度控制器执行各个方位的操作。驱动系统采用的是三相转化模块和基于DSP的电动机控制器。控制系统的性能经过仿真验证是良好的。     

混联式混合动力客车逻辑控制策略研究

混合动力客车的控制策略决定整车的性能。分析某混联式混合动力客车的组成结构和基于逻辑控制的控制策略,建立相应的混联式混合动力客车仿真模型及其控制器,通过AVL/CRUISE和MATLAB/Simulink联合仿真分析,获得该车在中国典型城市公交工况下的动力性和百公里油耗。仿真结果表明,各主要部件能按照控制规则实现状态的合理切换,基于逻辑控制的控制策略能满足整车性能指标要求。     

用于三相PWM并网逆变器的改进型幅相控制方法

In this paper, a vector regulating principle of the phase and amplitude control （ PAC ） method for three-phase grid-connected inverters is presented. To solve the problem of heavy inrush current and slow dynamic response when system starts up, the starting voltage prediction control and the current feed-forward control are proposed and used, which improve the dynamic performance of the system in the PAC. The experimental results carried out on a three-phase grid-connected inverter proved the validity of the proposed method.     

模糊自校正PID液位串级控制系统设计与仿真

针对双容水箱液位控制问题,探讨了模糊控制理论在液位控制系统中的应用,提出了基于模糊自校正PID的串级液位控制方案,设计了一种模糊自校正PID控制器,并在此基础上对该双容水箱液位在3种不同控制方案,即单回路PID控制、串级控制以及基于模糊自校正PID的串级控制下的控制效果进行了Simulink仿真研究。结果表明,相对于常规单回路PID以及常规串级控制,基于模糊自校正PID的串级控制系统在超调量、调节时间、抗干扰等方面有更好的控制品质。     

电动汽车用永磁同步电机模糊控制

本文研究了电动汽车用的正弦波永磁同步电机（PMSM）模糊控制的仿真分析。分析了永磁同步电机用于矢量控制的数学模型，并建立了基于其数学模型的电机控制仿真软件包。在PMSM双闭环调速系统中，电流环采用滞环电流调节器，速度环采用参数自调整模糊PI控制。通过对传统PI控制和模糊PI控制方法的仿真实验，去验证这种模糊PI控制方法响应快、无超调，与传统PI控制方法相比具有更好的稳定性和抗干扰能力。所开发的电动汽车用的永磁同步电动机驱动系统具有良好的性能，能够很好地满足电动汽车性能要求。     

位置控制系统Fuzzy-PI调节器研究

针对传统自动位置控制系统的不足,对在位置控制系统中采用Fuzzy-PI调节器进行了研究,并进行了仿真试验。结果表明,用该方法可以有效地提高位置控制系统的稳态性能。     

A robust gain-scheduling control based on VSC and fuzzy local controller network

Based on variable structure control (VSC) and fuzzy local controller network (FLCN), a new design method of robust gain-scheduling control is proposed in this paper. The proper sliding-modes and the tendency-rates for general operation-points are introduced such that the system gets into the sliding-modes’ motion as soon as possible and has the desired performance. Its good performance is due to the robustness of VSC. However, any local controller works well only in the local region of a specified operation-point. In this paper functions similar to the fuzzy-attributed function in fuzzy-systems are introduced to form FLCN. The simulation results showed that the presented method is feasible and acceptable. Project supported by the Natural Science Foundation of China (NSFC: 69934030) and the Zhejiang Provincial Natural Science Foundation of China (ZJPNSFC: ZD9905).     

Error analysis for remote nonlinear iterative learning control system with wireless channel noise

In this paper, the iterative learning control problem is considered for a class of remote control system over wireless network communication channel. The control performance of remote iterative learning control (R-ILC) system is analyzed and an error boundary of the stable output of the R-ILC system is obtained for the boundary stochastic noise channel. Finally, we obtain some rules to reduce the fluctuation caused by wireless channel noise through the analysis results for fluctuation boundary. The simulation results prove the proposed rule is correct.     

流体性能综合控制实验装置研制

利用可编程逻辑控制及变频控制技术,流体采用电动阀门控制,以离心泵性能测试为主体,扩展开发了一套流体性能综合控制实验装置。实验装置功能包含离心泵性能测定、变频调速、流量测量、孔板流量计标定、水箱液位控制等。介绍了实验装置设计方案、组成、实验功能及操作说明。本实验装置的研制对高校工科实验教学的发展具有明显的借鉴意义。     

Intelligent Control Scheme of Engineering Machinery of Cluster Hybrid System

In a hybrid system, the subsystems with discrete dynamics play a central role in a hybrid system. In the course of engineering machinery of cluster construction, the discrete control law is hard to obtain because the construction environment is complex and there exist many affecting factors. In this paper, hierarchically intelligent control, expert control and fuzzy control are introduced into the discrete subsystems of engineering machinery of cluster hybrid system, so as to rebuild the hybrid system and make the discrete control law easily and effectively obtained. The structures,reasoning mechanism and arithmetic of intelligent control are replanted to discrete dynamic, continuous process and the interface of the hybrid system. The structures of three types of intelligent hybrid system are presented and the human experiences summarized from engineering machinery of cluster are taken into account.     

基于角色访问控制模型的应用研究

基于角色访问控制(RBAC)技术的一个重要概念就是角色,通过在用户和访问权限之间增加一个角色层,使得权限控制更为简单且灵活有效。文章分析了RBAC96模型,并结合一个办公自动化系统的具体应用,对模型进行扩充,提出了业务角色的概念。     

Grouting Control for Deep-Water Jacket Skirt Pile

* With the further exploitation of offshore oil fieldsin deep-water, studying deep-water jacket construc-tion technique is becoming increasingly vital. At pre-sent, offshore platforms are usually sustained by ajacket and the jacket is fixed on the sea floor withskirt piles. For the sake of enhancing the stiffness ofthe jacket, the method of fillingcementslurry into theannular gap between the sleeve of the jacket and theskirt piles is usually adopted to connect the jacket andthe skirt piles[1].…     

基于SPC的高职院校教学质量管理系统研究

针对高职院校教学质量监控评价的特点,应用统计过程控制(SPC)技术和计算机信息技术,分析高职院校教学质量管理流程,构建基于SPC的高职教学质量控制流程框架,开发高职教学质量管理系统。采用控制图和过程能力分析对教学质量控制点进行分析监控,实现了教学质量数据的科学分析和对教学质量的有效控制,提高了高职院校的教学质量。