基于改进多重同步挤压样条Chirplet变换的结构瞬时频率识别

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (17) : 145-153.

论文

基于改进多重同步挤压样条Chirplet变换的结构瞬时频率识别

袁平平1，赵周杰1，苏慧琳2，任伟新3

作者信息 +

Structural instantaneous frequency identification based on IMSSSCT transform

YUAN Pingping1, ZHAO Zhoujie1, SU Huilin2, REN Weixin3

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文章历史 +

摘要

为提高样条Chirplet变换的结构频率识别精度，本文提出了一种基于改进多重同步挤压样条Chirplet变换（improved multi-synchrosqueezing spline-kernelled Chirplet transform， IMSSSCT）的瞬时频率识别方法。首先通过引入三参数高斯窗函数和能量集中度原理对样条Chirplet变换进行改进，然后结合多重同步挤压算法进一步提高改进样条Chirplet变换（improved spline-kernelled Chirplet transform， ISCT）的时频能量聚集度。通过单自由度Duffing系统和三层剪切框架结构的数值仿真及悬臂梁结构试验对所提方法进行了验证。研究结果表明，IMSSSCT能有效识别非线性结构和时变结构的瞬时频率。

Abstract

瞬时频率；能量集中度；参数优化；改进样条Chirplet变换；多重同步挤压

Key words

instantaneous frequency / energy concentration / parameter optimization / improved spline-kernelled Chirplet transform / multi-synchrosqueezing

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袁平平1, 赵周杰1, 苏慧琳2, 任伟新3. 基于改进多重同步挤压样条Chirplet变换的结构瞬时频率识别[J]. 振动与冲击, 2024, 43(17): 145-153

YUAN Pingping1, ZHAO Zhoujie1, SU Huilin2, REN Weixin3. Structural instantaneous frequency identification based on IMSSSCT transform[J]. Journal of Vibration and Shock, 2024, 43(17): 145-153

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