The influence of ship motion on helicopter dynamic stability is rarely analyzed in the research process of dynamic interaction between shipboard helicopter and flight deck as yet. Nonlinear characteristic of helicopter landing gear is not considered in the only research literatures. Multi-body dynamic numerical model of shipboard helicopter was built to analyze the shipboard helicopter dynamic characteristic in this paper. Models with nonlinear characteristics of hydraulic shock absorber and tire were established to improve fidelity and hydraulic lead-lag dampers were also included. The transient response of airframe model which withstand different ship roll angles, period of ship roll motion and parameter of lead-lag damper was parametric investigated. It is concluded that the diameter of lead-lag damper orifice play a great role in shipboard helicopter fuselage vibration. The amplitude of airframe vibration increases significantly and the rotor instable speed range expand with the increasing diameter of orifice, whereas the period of ship motion has little effect on it. It is also concluded that the influence of ship roll angle on fuselage steady state response amplitude is obvious out of the instable speed range, and become indistinct due to self-excited vibration within its instable speed range.
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赵则利,许锋. 舰载直升机“舰面共振”动力学分析[J]. 科学技术与工程, 2020, 20(16): 6650-6657. Zhao Zeli, Xu Feng. Dynamic Analysis of “Ship Resonance” for Shipboard Helicopter[J]. Science Technology and Engineering,2020,20(16):6650-6657.