用总体最小二乘法识别桥梁结构的气动导数  

BRIDGC DECK AERODYNAMIC DERIVATIVE IDENTIFICATION BY UNIFIED LEAST-SQUARE METHOD

作　　者：张若雪[1] 顾明[1] 项海帆[1] 

机构地区：[1]同济大学

出　　处：《振动与冲击》1997年第2期12-16,共5页Journal of Vibration and Shock

摘　　要：本文根据最小二乘原理,利用MITD法得到的复频率为初值,采用线性和非线性交叉迭代法对桥梁断面的气动导数进行了总体时域识别。数值仿真结果表明,在噪声强度高达15％时该方法均能得到较好的收敛解。In this paper, according to least-square theory, a unified time-domain parameter identification method is applied to simultaneously extract eightaerodynamic derivatives of bridge deck. Linear and nonlinear alternative iteration is employed with the complex frequencies estimated by MITD method as initial value. The results of Numerical simulation show that the present method performs well with the noise intensity even up to 15%.

关 键 词：气动导数 最小二乘法 桥梁 振动 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] O241.2[交通运输工程—道路与铁道工程]