轮间距与双轮共转对飞机起落架摆振的影响分析

Effect of wheel-distance and corotating wheels on aircraft shimmy

建立了双轮共转起落架的摆振非线性动力学模型,并采用分岔计算方法对模型进行了稳定性求解,形成了一套适用于摆振分析的分岔计算方法。在此基础上,对轮间距和双轮共转对摆振稳定性的影响进行了分析。轮间距的增加能有效减小侧向摆振的发生区域,对扭转摆振区域则相反,且可能引起摆振区域拓扑结构的改变。双轮共转仅在轮间距较大的情况下,对侧向摆振起到抑制作用。

A non-linear dynamics model was developed to study the shimmy oscillations of an aircraft nose landing gear with corotating wheels. A bifurcation analysis was applied in dealing with the model,and the details of the procedure were described. The effects of wheel-distance and corotating wheels were studied based on the model. It is concluded that the longer wheel-distance means more stability against lateral shimmy and less stability against torsional shimmy,and may lead to the change in topological structure of shimmy areas. Corotating wheels reduce the area of lateral shimmy only when with long wheel-distance.