| Issue |
MATEC Web Conf.
Volume 316, 2020
2020 6th Asia Conference on Mechanical Engineering and Aerospace Engineering (MEAE 2020)
|
|
|---|---|---|
| Article Number | 04005 | |
| Number of page(s) | 8 | |
| Section | Aerospace Engineering | |
| DOI | https://doi.org/10.1051/matecconf/202031604005 | |
| Published online | 01 July 2020 | |
An Analytical Method for Coaxial Helicopter Ground Resonance
1
School of Basic Sciences for Aviation, Naval Aviation University, Yantai, China
2
Department of Aviation Technology, Nanshan Aeronautical College, Yantai, China
a Corresponding author: 281726288@qq.com
A time-frequency analytical method is presented to analyze physical mechanism of coaxial helicopter ground resonance. Eigenvalue calculation and numerical integration of disturbance equations of motions are used to obtain modal characters and time-domain response characters of coaxial helicopter ground resonance, and the interaction between rotors and body is revealed according to response of various DOFs. The analysis results show that regressive lag mode with upper rotor character is the most instability mode. In dynamic instability region, coaxial helicopter ground resonance is mainly due to energy transferred between periodic lag motion of upper rotor and body roll rotation. For this instability mode, energy transferred between periodic lag motion of lower rotor and body roll rotation is also existed, and it can enhance ground resonance instability of coaxial helicopter.
© The Authors, published by EDP Sciences, 2020
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