基于改进样条Chirplet变换的结构瞬时频率识别  

Structural instantaneous frequency identification based on improvedspline-kernelled Chirplet transform

作　　者：袁平平 赵周杰 沈中祥[3] YUAN Pingping;ZHAO Zhoujie;SHEN Zhongxiang(School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212100,China;Jiangsu New Yangzi Shipbuilding Co.Ltd.,Jingjiang 214532,China;School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学土木工程与建筑学院,镇江212100 [2]江苏新扬子造船有限公司,靖江214532 [3]江苏科技大学船舶与海洋工程学院,镇江212100

出　　处：《江苏科技大学学报（自然科学版）》2024年第3期98-104,共7页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：江苏省博士后科研资助计划项目(2021K562C)。

摘　　要：为了提高结构瞬时频率识别的精度,对样条Chirplet变换进行改进,并结合能量集中度原则优化窗函数的参数.利用解析信号和两层框架模型验证改进样条Chirplet变换识别瞬时频率的准确性,再结合试验验证改进样条Chirplet变换能有效识别实际工程结构的瞬时频率.In order to improve the accuracy of structural instantaneous frequency identification,the spline-kernelled Chirplet transform is modified,and the window function parameters are optimized based on the principle of energy concentration.Firstly,the analytical signal and the two-layer frame model are used to verify the accuracy of the instantaneous frequency of the improved spline-kernelled Chirplet transform(ISCT),and secondly,the experimental results show that the improved spline-kernelled Chirplet transform can effectively identify the instantaneous frequency generated in the actual engineering structure.

关 键 词：时变信号 瞬时频率 改进样条Chirplet变换 时频分析 

分 类 号：TN911.6[电子电信—通信与信息系统] TU311.3[电子电信—信息与通信工程]