基于改进样条Chirplet变换的结构瞬时频率识别
Structural instantaneous frequency identification based on improved spline-kernelled Chirplet transform
袁平平 1赵周杰 2沈中祥3
作者信息
- 1. 江苏科技大学 土木工程与建筑学院,镇江 212100;江苏新扬子造船有限公司,靖江 214532
- 2. 江苏科技大学 土木工程与建筑学院,镇江 212100
- 3. 江苏科技大学 船舶与海洋工程学院,镇江 212100
- 折叠
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.
Abstract
In order to improve the accuracy of structural instantaneous frequency identification,the spline-kernel-led 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 instan-taneous 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Key words
time-varying signal/instantaneous frequency/improved spline-kernelled Chirplet transform/time-frequency analysis引用本文复制引用
基金项目
江苏省博士后科研资助计划项目(2021K562C)
出版年
2024
NETL
NSTL
万方数据