时频域滤波方法及其在颤振信号处理中的应用

Time-Frequency Filtering Analysis and Applications to Flutter

采用自适应时频分析方法并通过理论分析和数字仿真完成了相应的数值特性与应用特性研究。根据颤振试验的原理和观测信号特点,将所提出的两种时频域滤波算法引入到了飞机结构亚临界响应分析的颤振边界预测研究当中,即通过联合时频分析(JTFA)与时频域滤波提取有效信号再进行模态参数提取与颤振边界预测,取得了预期的效果。

Adapting the self-adaption time-frequency analysis method, through the theoretical analysis and digital simulation the study of relative numeral and applied characteristics has been done in this paper. According to the principle of the flutter test and the characteristics of the signal, the two time-frequancy field filtering algorithms are led to research on the flutter boundary prediction of the subcritical response of the aeroplane structure. Through the joint time-frequency analysis (JTFA) and the time-frequency field filtering, the effective signal and the model parameter are picked up and the flutter boundary is predicted. The desired result is achieved.