大型液压离心振动台控制策略的仿真研究  

Numerical simulation of the control strategy for large hydraulic centrifuge shaker

作　　者：罗中宝[1] 杨志东[1] 陈良[1] 丛大成[1] 张连朋[1] 

机构地区：[1]哈尔滨工业大学机电工程学院,黑龙江哈尔滨150001

出　　处：《振动工程学报》2015年第1期18-26,共9页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(51205077)

摘　　要：离心振动台是一种先进的土工抗震试验设备,文中围绕其本身及复现信号的特殊性,仿真研究了离心振动台控制策略中的关键问题。首先在液压动力机构耦合线性模型的基础上,结合对离心振动台中四种非线性因素的建模,综合得到了原型样机液压动力机构的非线性耦合模型;其次,在简要回顾离心振动台伺服控制策略中各部分功能的基础上,研究了采用二阶带通滤波器作为顺馈控制器时系统动态特性的改善情况;最后,针对离心振动台复现信号具有"短时高频"的特点,研究了采用不同NFFT、误差修正系数时离线迭代算法的收敛精度和收敛速度。经仿真研究,当NFFT为512,α取0.5时,整个离线迭代过程最为理想,四次迭代后的收敛精度约为5%左右。The centrifuge shaker is considered as one of the advanced equipments in the geotechnical anti-earthquake field.The control strategy of centrifuge shaker is numerically simulated in this paper,which mainly focuses on the particularity of centrifuge shaker systems and the feature of their reference signals.A non-linear coupling model of the hydraulic actuator unit is firstly established for the experimental prototype of centrifuge shaker by integrating four non-linear factors into the previous presented linear coupling model.Then,the function of every component of the centrifuge shaker＇s servo control strategy is briefly introduced.Especially,the performance improvement of the system with feedforward compensation is comprehensively examined when we introduce a band pass filter as the feedforward controller.With consideration of the reference signal＇s particular feature（short duration and high frequency）,the convergence precision and convergence speed of the off-line iteration algorithm are finally evaluated for different NFFT and different error correction coefficients.After the whole numerical simulation,we conclude that the whole off-line iteration process is optimal when NFFT=512and,α=0.5,and the convergence precision is reduced to 5% after the fourth iteration.

关 键 词：抗震 离心振动台 伺服控制策略 振动控制策略 离线迭代 

分 类 号：TU352.1[建筑科学—结构工程]