Guaranteed Cost Iterative Learning Control for Multi-Phase Batch Processes

Batch process is a typical multi-phase process. Due to the interaction between the phases of the batch process, high precision control in a single phase cannot guarantee high precision control of the whole batch process. In order to solve this problem, the guaranteed cost iterative learning control (ILC) of multi-phase batch processes is studied in this paper. Firstly, through introducing the output error, the state error and the extended information, the multi-phase batch process is transformed into an equivalent 2D switched system which has different dimensions. In addition, under the measurable condition, the guaranteed cost iterative learning control law with extended information is designed. The proposed control law ensures not only the stability of the system but also the optimal control performance. Next, in order to study the stability of the system and the minimum running time under the condition of stable running, the multi-Lyapunov function method is used. By means of the average dwell time method, the sufficient conditions ensuring system to be exponentially stable are given in the form of linear matrix inequality (LMI). Finally, the injection molding process is taken as an example to make simulation, which shows the feasibility and effectiveness of the proposed method.     

高速公路绿化工程几个技术问题

高速公路绿化是高速公路管理的重要组成部分,也是高速公路的主要景观之一.随着近年来我国高速公路的大规模修建,高速公路绿化工程也越来越受到高度的重视.公路绿化一般起着防眩、防噪音、吸尘及美化环境、水土保持等多方面的作用.然而,高速公路绿化不同于普通公路绿化,需要考虑高速公路的交通功能、宏观效果、立地条件、管养等多方面的问题,因此,对绿化技术的要求相对比较特殊.     

京石高速公路中央隔离带绿化管理分析

中央隔离带养护管理是高速公路养护管理中的重要内容之一。笔者结合近几年京石高速(河北段)中央隔离带绿化管理的现状与问题,对京石高速公路中央隔离带的立地条件和管护压力与困难进行了较全面的分析,进而对京石高速公路中央隔离带养护管理提出了改进建议。     

一种ω型弹条扣件扣压力的锤击测量方法研究

为实现ω型弹条扣件扣压力的快速测量,提出一种锤击测量方法,其理论基础为结构应力与固有频率的关联性。以Ⅱ型ω弹条扣件为例,设计了扣压力锤击测量试验装置。使用COMSOL仿真软件分析了扣件的锤击响应和振动特性,之后开展了锤击试验研究,最终得到弹条扣件扣压力与系统固有频率的对应关系。研究表明,Ⅱ型ω弹条扣件系统在服役状态下的固有频率约为1 kHz,并且固有频率与扣压力近似呈正比关系,验证了弹条扣件扣压力锤击测量方法的可行性。     

京石高速公路中央分隔带绿化管理分析

中央分隔带养护管理是高速公路养护管理的重要内容之一。结合近几年京石高速公路(河北段)中央分隔带绿化管理的现状与问题,对京石高速公路中央分隔带的立地条件、管护压力及困难进行了较全面的分析,进而对京石高速公路中央分隔带养护管理工作提出了改进建议。