水利学报Issue(8)：958-966,9.DOI:10.13243/j.cnki.slxb.2014.08.009
基于自然激励技术和HHT变换的重力坝模态分析
Modal parameter identification of gravity dam based on natural excitation technique and Hilbert-Huang transform
摘要
Abstract
Modal identification of the Shuikou concrete gravity dam has been conducted based on natural ex-citation technique and Hilbert-Huang transform under four different seismic excitations on it. A new ap-proach is proposed by bandpass filtering technology combining with the modal identification method, which avoids the phenomenon of frequency mixed effectively during the signal decomposition, thus improving the accuracy and reliability of the modal parameter identification. Firstly,a simple example of structural dynam-ics was used to verify the correctness of the method, and then this method was used for concrete gravity dam modal parameter identification for the first time. The results show that the frequencies identified by HHT+NExT are slightly larger than the result of the peak-picking method and ARX model, and close to the results of FEM. Damping ratios identified by HHT+NExT are also somewhat larger than the results of the peak-picking method and ARX model, and meanwhile, they are slightly less than the design specifica-tion ranges namely between 5% ~ 10% of the lower limit of 5% in specifications for seismic design of hy-draulic structures.关键词
水工结构/模态识别/水口混凝土重力坝/Hilbert-Huang变换/自然激励技术Key words
hydraulic structure/modal identification/Shuikou concrete gravity dam/Hilbert-Huang trans-form/natural excitation technique分类
建筑与水利引用本文复制引用
谯雯,罗佩,刘国明..基于自然激励技术和HHT变换的重力坝模态分析[J].水利学报,2014,(8):958-966,9.基金项目
福建省自然科学基金项目 （）
