分层抽样技术在随机减量法中的应用  

Application of the Stratified Sampling on Random Decrement Method

作　　者：李明[1] 吴红华[2] 史文海[2] 

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]湖南大学土木工程学院,长沙410082

出　　处：《武汉理工大学学报》2008年第3期79-82,共4页Journal of Wuhan University of Technology

基　　金：国家自然科学基金(50578061,50778072)

摘　　要：作为一种常用的抽样方法,分层抽样技术由于有比随机抽样技术更高的抽样精度,正在得到更加广泛的应用。该文将抽样技术应用于随机减量法中随机振动信号的提取,在一定程度上解决了随机信号段数不足的问题,明显改善随机减量信号的质量。实例表明应用该文方法抽取50个样本所获得的结果同抽取600个样本所获得的结果有相似的精度。As a common sampling method in modem statistics,stratified sampling attracted much attention in practice.It had higher sampling precision than random sampling.This paper introduced stratified sampling,and applied it to random decrement methods,which lead to good results.The numerical results with the method using 50 samples were very similar to those with the plain sampling method using 600 samples,which showed the high efficiency and precision of the presented method.

关 键 词：随机减量法 分层抽样 随机振动 模态参数 

分 类 号：TU311.3[建筑科学—结构工程]