%0 Journal Article
%T 基于连续小波变换的时变结构瞬时模态参数识别<br>Instantaneous Modal Parameter Identification of Time-varying Structures Based on Continuous Wavelet Transform
%A 赵丽洁
%A 刘瑾
%A 杜永峰
%A 李万润
%J 地震工程学报
%D 2019
%R 10.3969/j.issn.1000-0844.2019.03.601
%X 为体现时变结构动力特性，定义随机冲击荷载作为时变结构输入激励，提出了基于连续小波变换的时变结构瞬时模态参数识别方法。在短时时变假定条件下，建立基于模局部极大值的连续小波变换时变参数识别原理，利用结构的输出响应进行瞬时模态参数识别，采用三自由度的时变结构体系进行数值模拟，该方法能够准确识别时变结构的瞬时模态参数值。通过设计具有质量参数可变的两层钢框架模型进行测试，验证了方法的有效性与可行性。<br>In this paper, we propose a method for identifying the instantaneous modal parameters of a time-varying structure based on a continuous wavelet transform. First, we selected a random impact load as the input excitation of a time-varying structure. Then, under the assumed time-varying condition in a short time span, we established a principle for identifying the time-varying parameter based on the continuous wavelet transform. We identified the instantaneous modal parameter using only the output response of the structure, and performed a numerical simulation of a 3-DOF time-varying structure system. The results show that this method can accurately identify the instantaneous modal parameter of a time-varying structure. Finally, we designed and tested a two-layer steel frame model with variable quality parameters, and the results further verified the validity and feasibility of the proposed method
%K 连续小波变换
%K 时变结构
%K 参数识别
%K 瞬时模态参数
%K 随机冲击激励<br>continuous wavelet transform
%K time-varying structure
%K parameter identification
%K instantaneous modal parameters
%K random excitation
%U http://dzgcxb.ijournals.cn/ch/reader/view_abstract.aspx?file_no=20190308&flag=1