航空学报 > 2007, Vol. 28 Issue (3): 550-555

非线性叶间黏弹减摆器对直升机空中共振的影响分析

王波,李书,张晓谷   

  1. 北京航空航天大学 飞机设计所
  • 收稿日期:2006-04-05 修回日期:2006-07-03 出版日期:2007-05-10 发布日期:2007-05-10
  • 通讯作者: 李书

Influence Analysis of Helicopter Air Resonance with Nonlinear Interblade Viscoelastic Dampers

WANG Bo,LI Shu, ZHANG,Xiao-gu   

  1. Institute of Aircraft Design, Beijing University of Aeronautics and Astronautics
  • Received:2006-04-05 Revised:2006-07-03 Online:2007-05-10 Published:2007-05-10
  • Contact: LI Shu

摘要:

建立带非线性叶间黏弹减摆器的直升机旋翼/机体耦合动稳定性分析模型。与全机飞行力学平衡计算相结合,旋翼/机体耦合动稳定性分析模型考虑前飞状态桨叶变距操纵、机体姿态角和桨毂纵向安装角。针对具有非线性特性的叶间黏弹减摆器,采用基于复模量的非线性VKS改进模型、Simulink时域仿真和多桨叶坐标变换等效阻尼识别法分析直升机悬停、前飞状态下旋翼/机体耦合动稳定性及减摆器双频动幅值,并就减摆器布局、全机总重以及前飞速度对桨叶摆振后退型模态阻尼的影响进行分析。结果表明:由悬停到前飞直升机动稳定性一般均下降,一定速度后又上升;加上减摆器能消除前飞不稳定区;叶间黏弹减摆器抬头连接能提高模态阻尼。

关键词: 直升机动力学, 空中共振, 叶间黏弹减摆器, 非线性特性, 参数分析

Abstract:

An analytical model is developed for helicopter rotor/fuselage coupled dynamic stability with interblade nonlinear viscoelastic dampers.Coupled with the calculation of helicopter equilibrium in the flight dynamics,the analytical model considers the factors as blade torsion manipulation,fuselage pose angle and hub longitudinal install angle.Along with the blade viscoelastic damper nonlinear properties, an improved nonlinear VKS model based on complex modulus.

Key words: helicopter , dynamics,  , air , resonance,  , interblade , viscoelastic , damper,  , nonlinear , characteristic,  , parametric , analysis

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