|
| Application of Flutter Flight Test Based on Time-frequency Analysis Method |
| Received:July 02, 2020 Revised:August 07, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.09.028 |
| KeyWord:flutter flight test non-stationary variational mode decomposition intrinsic mode function time-frequency analysis |
| Author | Institution |
| WANG Shao-nan |
China Flight Test Establishment, Xi′an , China |
| LIU Li-kun |
China Flight Test Establishment, Xi′an , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to develop a time-frequency analysis method which can be better applied in practical flutter flight test in view of the flutter signal characteristics of low SNR, dense mode and non-stability. Variational mode decomposition (VMD) developed in recent years was used to decompose the complex signal into some intrinsic mode functions (IMF) of single component. The instantaneous frequency and amplitude were calculated by the Hilbert Transform of IMF, and then the time-frequency analysis for signals could be conducted. The effectiveness of the time-frequency analysis method based on VMD in expressing the non-stationary characteristics of signal was validated by simulation example. By applying the method to the abnormal vibration data of actual flutter flight test, accurate and clear time-frequency diagram could be obtained, which could well show the limit cycle oscillation process of the stores. The method can be used as a powerful tool for time-frequency analysis of flutter flight test signals, which is helpful to analyze abnormal data, identify fault sources, and provide support for solving subsequent problems. |
| Close |
|
|
|