摘要
应用非平稳信号的时频滤波进行多自由度时变线性系统的模态分解。将基于Gabor展开的时频滤波 方法引入多自由度线性时变结构模态参数辨识中,提取单模态响应分量。对线性时变系统在白噪声激励下振动响 应的单模态响应进行提取,通过对附加质量随时间连续变化的悬臂梁的单模态响应分离来验证分解方法韵有效 性。实验研究结果和理论计算结果表明:方法为参数时变的线性系统的模态分解提供了一条新的途径。
A new method of modal decomposition based on time-frequency filter is proposed in this paper. Single modal response of time-variant multi-degree freedom system is extracted by Gabor expansion. A new algorithm is presented to estimate the modal frequencies, in which the system is excited by white noise random signal. The extraction of single modal response of a cantilever with varying mass is used to validate the proposed method. The decomposition results have indicated that the method proposed in this paper is an effective tool for modal decomposition of time-variant linear system.
出处
《噪声与振动控制》
CSCD
北大核心
2005年第5期15-17,59,共4页
Noise and Vibration Control
基金
国家自然科学基金资助项目(编号10302019)
关键词
振动与波
时变线性系统
模态分解
时频滤波
单模态响应
vibration and wave
time-variant linear system
decomposition of modal
time-frequency filter
single modal response
