摘要
以一个正弦扫描振动响应信号为例,分别应用常用的正弦约减法与短时Fourier变换和Wigner分布进行了对比分析,讨论了在正弦扫描振动激励下结构响应的时频分析问题。结果表明,时频分析方法可以更好地揭示结构的非线性特性或由于层间间隙、连接不牢引起的碰撞等动力学行为,是一种更为有效的正弦扫描振动响应分析方法。
By means of sine reduction method, short-time Fourier transform (STFT) and Wigner Distribution (WD), an experimental recorded signal induced by a sine-swept vibration test was analyzed. Subsequently, the problem about time-frequency analysis for structure sine-swept vibration response was discussed in detail. The results show that, time-frequency analysis methods may reveal the nonlinear properties and the dynamic behaviors of structure, such as impact induced by the interspaces between the layers or the loosing joints existing in the structure. And the time-frequency analysis methods are more effective for structure response analysis in sine-swept vibration test.
出处
《振动与冲击》
EI
CSCD
北大核心
2005年第6期13-16,共4页
Journal of Vibration and Shock
基金
中国工程物理研究院项目基金项目(2003-4210506-4-02)
关键词
正弦扫描振动
正弦约减法
时频分析
非线性特性
动力学行为
Analysis
Dynamics
Fast Fourier transforms
Frequencies
Mathematical transformations
Testing
Vibrations (mechanical)
