【作者】 陈勇； 陈克姣； 夏立群； 熊峻江；

【Author】 CHEN Yong;CHEN Ke-jiao;XIA Li-qun;XIONG Jun-jiang;School of transportation science and engineering, Beijing University of Aeronautics and Astronautics;Xi’an Flight Automatic Control Research Institute;

【机构】 北京航空航天大学交通科学与工程学院； 西安飞行自动控制研究所；

【摘要】 本文提出一种流体单元实体化的飞机舵机建模新方法。采用密度相同的不可压金属材料六面体实体单元模拟活塞筒体内的液压油,并在液压油的六面体实体单元与活塞、筒体的四面体实体单元之间设置接触对,模拟结构固-液耦合效应,建立了某民机方向舵的有限元分析模型,分析了方向舵在活塞杆极限伸出、极限缩回与中立位置状态下的前六阶固有频率及其对应的模态振型;在此基础上,进一步分析了其一阶线性屈曲失稳模态和临界载荷。计算结果表明,方向舵在设计极限载荷下不会发生结构的屈曲失稳故障,满足相应的使用设计要求。更多还原

【Abstract】 A new modeling technique of fluid element materialization applied on aircraft rudder is presented. Hex solid elements of incompressible metal material with the same density are adopted to simulate the hydraulic oil in the piston cylinder, then the solid-liquid coupling effect of structure is taken into consideration by the introduction of contact pairs between Hex elements of hydraulic oil and Tex elements of piston and cylinder. Finite element analysis models of a certain civil-aircraft rudder are respectively established as piston is at ultimate extension, ultimate retraction and the neutral position. The intrinsic frequency of first six order and the corresponding modal shapes under the three conditions are obtained. On the basis of that, further analysis of the first-order linear bulking modes as well as the buckling critical loads of the aircraft rudder at different states have been calculated. Theanalysis results indicate that the rudder suffering designed ultimate load meet the design requirement and won’t happen structural buckling failure.更多还原