基于xPC快速原型的LMS算法在道路模拟振动台中的应用  

Application of LMS algorithm in road simulation shaking table based on rapid prototyping of xPC

作　　者：吕梅蕾[1] 徐梓斌[2] 

机构地区：[1]浙江工业大学浙西分校信息与电子工程系,衢州324000 [2]浙江树人大学现代教育技术中心,杭州310015

出　　处：《农业工程学报》2010年第5期142-147,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：浙江省自然科学基金资助项目(Y107605);浙江省科技计划资助项目(2009C31095)

摘　　要：针对道路模拟振动台加速度波形复现跟踪精度较差的问题,提出了基于LMS(least mean square)自适应滤波算法作为道路模拟振动台的伺服控制系统的前馈环节,LMS自适应算法通过调节有限长冲击响应FIR数字滤波器的权值,也即调节前馈控制器的参数,以提高加速度波形复现的精度。对单通道道路模拟振动台进行数学建模,并采用PID和LMS两种控制器对控制系统进行了设计与仿真。仿真结果表明,自适应滤波算法LMS跟踪精度远远高于传统的PID控制器,并且具有在线调节FIR滤波器权值的优点。最后,采用xPCTarget快速原型软件进行了试验验证,试验结果表明,基于LMS控制策略提高了道路模拟振动台加速度波形复现的精度,利用所提出的控制策略可以成功地进行道路模拟加速度波形复现试验。In order to improve the acceleration waveform replication tracking accuracy of road simulation shaking table,this paper presented an adaptive filter LMS（least mean square）algorithm as a feed-forward unit of servo control system in the shaking table.LMS adaptive algorithm was used to tune adaptively the weight of the FIR（finite impulse response） digital filter,as well as to adjust the parameters of the feed-forward controller to reduce the tracking error of acceleration waveform replication.A mathematical model on road simulation shaking table of single channel was built,and control system was simulated using PID（proportional integral derivative）and LMS controllers.These simulation results indicated that the acceleration waveform replication accuracy with proposed control strategy was superior to conventional PID controller.Finally,this paper represented the implementation of a rapid prototyping control system,using Matlab/Simulink blocksets to setup the Simulink model of road simulation shaking table with xPC Target.Therefore,the control system of road simulation shaking table based on adaptive LMS algorithm was designed and the effectiveness of the proposed control strategy was verified via these experimental results.A good performance of the proposed control strategy was achieved in experiments,and it can be successfully applied to the road simulation shaking table system for acceleration waveform replication.

关 键 词：算法 实时控制 动力学模型 LMS 道路模拟振动台 仿真 

分 类 号：TP271.31[自动化与计算机技术—检测技术与自动化装置]