摘要
对多支承激励间存在相位差的平稳随机响应分析问题给出了计算各种自谱密度及互谱密度的快速直接算法。此法计入了所有参振振型间的互相关项，以及各激励间的互相关项，是快速、简便、精确的频域分析方法，并可用实振型方便地处理非正交阻尼矩阵。
A fast algorithm of auto-PSD(Power Spectral Density)and cross-PSD for multi-excitation random seismic responses is suggested.This method naturally involves the cross-correlation items between the participant modes,as well as those between the excitations. It is shown that this is an efficient,simple and accurate algorithm within the frequency domain. In addition,the nonorthogo-nal damping matrix can be conveniently dealt with by using only structural real modes.
基金
国家自然科学基金
关键词
地震响应
随机
结构动力学
seismic response analysis:random:stationary/multi excitation
