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| Research on Helicopter Rotor Balance Detection and Vibration Signal Equal-angle Resampling Algorithm |
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| DOI：10.7643/issn.1672-9242.2023.05.014 |
| KeyWord:balance measurement helicopter vibration signal equal angle resampling accelerometer noise reduction algorithm |
| Author | Institution |
| LI Jian-ming |
Ether Engineering Technology Corporation of Aviation Logistics and Safeguard Ltd. |
| CHEN Chao |
Army Aviation Military Representative Office in Chengdu, |
| LIU Wen-fa |
Army Aviation Military Representative Office in Chengdu, |
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| Abstract: |
| In order to accurately measure the intensity and phase of helicopter rotor fundamental frequency vibration, this paper has carried out the research on equal angle sampling algorithm based on vibration signal noise reduction. Based on the classical architecture of helicopter rotor dynamic balance detection, the meshing vibration signal transmitted from the rotor hub is extracted as the scale of equal phase sampling, so as to convert the vibration data from equal time sampling to equal angle sampling, thus reducing the impact of phase non-uniform sampling caused by the weak fluctuation of speed on the FFT. For the main rotor test data of a helicopter in service at full speed, the rolling average vibration intensity and phase fluctuation of the measured results are significantly reduced after resampling by the above methods. The measured results of a helicopter show that the vibration fluctuation is less than ±0.01IPS and the phase fluctuation is less than ±10°. Under the condition of using the acceleration sensor, the precision of measurement can be improved by using the high frequency signal of meshing as the scale and resampling the vibration signal at the same angle. |
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