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采用格林-拉格朗日应变张量推导了桨叶的应变-位移关系,把无轴承旋翼桨叶作为多路传力系统进行处理,并应用哈密顿原理建立了桨叶运动的有限元方程,气动模型采用二维准定常片条理论和动力入流模型,研究了摆振销对无轴承旋翼悬停状态下气弹稳定性的影响.结果表明:摆振销可引入负的变距-摆振耦合,明显提高无轴承旋翼桨叶的一阶摆振模态阻尼;摆振销垂直偏置距离对无轴承旋翼桨叶的一阶摆振模态阻尼具有重要影响,距离增加,有利于加大一阶摆振模态阻尼,从而提高旋翼的气弹稳定性.
The strain-displacement relationship of blade is deduced by Green Lagrange strain tensor, and the bearingless rotor blade is treated as multi-channel force transmission system. The finite element equation of blade motion is established by Hamilton principle. The aerodynamic model is based on the two-dimensional quasi-stationary theory and the inflow model, and the influence of the pendulum pin on the stability of the aero-bomb under the condition of bearing-free rotor hovering is studied. The results show that the pendulum pin can introduce negative pitch- Coupling, the first-order mode vibration damping of bearingless rotor blade is obviously improved. The vertical offset distance of the pendulum vibration pin has an important influence on the first-order mode damping of the bearingless rotor blade. The distance increases and is beneficial to increase First-order shimmy mode damping, thereby enhancing the stability of the rotor aeroelastic.