摘要
前轮摆振是飞机地面动力学中的重点研究课题。基于多体动力学理论,采用有限元方法及点线吻合的方法处理缓冲器的柔性问题,建立了前起落架全柔性体摆振动力学模型,并采用起落架静力试验的结果对模型进行校验;给出了以飞机速度和防摆阻尼系数组成的飞机摆振稳定区域图;研究了轮胎的侧向刚度与转动间隙对临界防摆阻尼的影响。结果表明:采用点线吻合方法能准确有效地模拟柔性缓冲器的运动特性;采用二次防摆阻尼在速度高于10 m/s情况下,临界防摆阻尼随速度的增大逐渐减小甚至为零;随轮胎侧向刚度的增长而增加,转动间隙会显著提高所需的临界防摆阻尼。
Shimmy is a key subject of aircraft taxing dynamics. Based on multi-body dynamics theory, a flexible model of shimmy is developed by the means of FEM Method and point-curve coincidence, and verified with the data of static test. Figures of stable region are presented accordingly, formed by taxiing speed and critical anti- shimmy damping coefficient, to explore the effects of tire lateral stiffness and running clearance. The result shows that the method is effective to deal with flexible shock observer by means of point-curve coincidence. Critical damping coefficient decreases with taxing speed increasing when using the second anti-shimmy damping in the situation of the speed is higher than 10 m/s, and increases with tire lateral stiffness increasing, running clearance leads to sharp increase in critical damping coefficient.
出处
《航空工程进展》
2011年第4期432-436,484,共6页
Advances in Aeronautical Science and Engineering
关键词
起落架
摆振
柔性模型
转动间隙
动力学
landing gear
shimmy
flexible model
running clearance
dynamics
