舰载直升机“舰面共振”动力学分析  

Dynamic Analysis of“Ship Resonance”for Shipboard Helicopter

作　　者：赵则利 许锋[1] ZHAO Ze-li;XU Feng(College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China)

机构地区：[1]南京航空航天大学航空学院,南京210016

出　　处：《科学技术与工程》2020年第16期6650-6657,共8页Science Technology and Engineering

摘　　要：为了解舰载直升机舰面开车状态的动力学特性,以某舰载直升机为研究对象,建立了全机多体动力学模型、起落架液压缓冲系统模型和旋翼减摆器液压模型,进行了全机“舰面共振”动力学仿真分析。研究了舰船横摇角、舰船运动周期、旋翼液压减摆器参数对直升机“舰面共振”稳定性的影响。结果表明:在“舰面共振”状态,旋翼液压减摆器节流孔参数对舰载直升机机身振动幅值有较大的影响,随着减摆器节流孔孔径的增大,机身振动幅值大幅增加,直升机不稳定转速区扩大;舰船运动周期对机身振动幅值和不稳定转速区几乎没有影响;在不稳定转速区之外,舰船横摇角对机身振动稳态响应幅值的影响较明显。进入不稳定转速区后,由于自激振动影响,机身大幅振动,舰船横摇角对机身振动幅值的影响不再明显。The influence of the ship motion on the dynamic stability of helicopters and the nonlinear characteristics of landing gears were rarely reported on the literature in previous studies on the dynamic interaction between shipboard helicopters and ships.The multibody dynamic numerical model of a shipboard helicopter was built to analyze the shipboard helicopter dynamic characteristics.Models with nonlinear characteristics of hydraulic shock absorbers and tires were established to improve fidelity and hydraulic lead-lag dampers were also included.The transient response of an airframe model which withstood different ship roll angles,period of ship roll motion and parameter of lead-lag damper was parametric investigated.Results show that the diameter of a lead-lag damper orifice plays a great role in shipboard helicopter fuselage vibration.The amplitude of an airframe vibration increases significantly and the rotor’s unstable speed range expands upon the increasing diameter of orifice,whereas the period of ship motion has little effect on it.The influence of a ship roll angle on the fuselage steady state response amplitude is obviously out of the unstable speed range and becomes indistinct due to a self-excited vibration within its unstable speed range.

关 键 词：直升机 舰面共振 起落架 旋翼减摆器 自激振动 

分 类 号：V226[航空宇航科学与技术—飞行器设计]