摘要
针对润扬长江大桥北汊斜拉桥进行动力分析,采用主元分析对其频响函数进行了有效降维,并根据降维后的主元重构了结构频响.误差分析表明,可以用较少的主元向量来综合表征高维的结构频响函数;并且选取的主元个数越多,对频响函数的表征越精确,重构误差也越小.对于大跨斜拉桥(润扬长江大桥北汊斜拉桥)的1 024维频响函数可以仅用27个(或17个)主元来提取其主要特征,精度可满足工程需要.
The dynamic behavior of a long span cable-stayed bridge （ north bridge of Runyang Yangtse River Bridge） is calculated, the frequency response function （FRF） is compressed using principal component analysis （PCA）, and the FRF is then reconstructed based on a few, principal components. The error analysis shows that the main features of FRF can be extracted by using less principal components, and the more the principal components, the more precise the reconstructed FRF. The main features of the FRF of long span Runyang Bridge, which has 1 024 dimensions, can be extracted by 27 or 17 principal components, and the reconstruction error is acceptable.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第4期613-616,共4页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(50378017)
南航青年科研基金资助项目(Y0513-013)
关键词
斜拉桥
频响函数
主元
特征提取
cable-stayed bridge
FRF
principal component
feature extraction
