低阶等效系统的参数辨识  

Parameter Identification of Low order Equivalent System

作　　者：张永孝[1] 李希元[2] 

机构地区：[1]航空航天部六一八所 [2]西安公路学院

出　　处：《交通与计算机》1992年第5期27-35,共9页Computer and Communications

摘　　要：本文介绍了如何把一个未知的高阶系统通过其频率响应转化成与之等效的二阶带时延的低阶系统,它是一个总体寻优。本文所介绍的寻优算法,具有在广阔的五维空间自动确定总体最优区域,在此区域中利用外推力内插的多项式拟合法进行局部寻优,自动达到总体最优的特点。它使在多维空间中利用网格法寻优形成的“维数灾”得到了有效的抑制,由此生成的软件包,不仅寻优次数少,而且为用户提供选择拟配方式的机会,它是人机对话交互式的软件,以便系统设计人员输入经验初值,提高寻优效率。该软件包经过了实践的检验,可用于任何一个控制系统的品质评定。This paper introduces how to change the unknown high order system to an equivalent second order system with time delay by using frequency response,Which is a global optimization prob- lem.An optimization algorithm described here can automatically determine the global optimization re- gion in a vast five dimensional space.The local optimum values can be obtained and the global optimiza- tion is automatically achieved by using polynomical matching method of interpolation and extrapola- tion.The algorithm can effectively suppress the“dimensional disaster”which is formed from the grid optimization method in high dimensional space.The software package based on the algorithm only needs less times the opportunity to select matching methods for users.It is an interactive software pack- age,which permits the initial values of experience to be inputted by the designer and the optimization ef- feciency to be improved.The practice proves that the software package above can be used in quality evaluation for any control system.

关 键 词：寻优 拟配 等效系统 参数辨识 

分 类 号：O212[理学—概率论与数理统计]