扭力臂结构参数对缓冲器卡滞特性的影响研究

Analysis on the Impact of Torque Arm Structure Parameters on Landing Gear Shock Absorber

起落架缓冲器卡滞与否对飞行器起降安全极其重要。以某半轴支柱式无人机主起落架为研究对象,基于临界摩擦系数法建立了卡滞特性分析模型,发现在三点刹车载荷工况、左偏航载荷工况下存在卡滞隐患,进而分析了扭力臂位置角、扭力臂交点到下轴套距离和到支柱轴线距离等结构参数对缓冲支柱卡滞特性的影响。研究发现:扭力臂位置对该缓冲支柱卡滞特性其影响较大,安全角度范围为70度到100度,最佳角度为75度;扭力臂交点到下轴套距离和到支柱轴线距离对其影响较小,最佳长度分别为270mm和260mm。

Binding problem of landing gear shock absorber is an extremely important issue of the security of aircraft take-off and landing. Taking the half-axle main landing gear of a unmanned aerial vehicle as the research object, the analysis of shock strut binding characteristic is modeled, with the method of critical friction coefficient. The result shows that there is a danger in the three-point brake load case and the left yaw load case. Then the effect of torque arm structure parameters to shock strut is researched, such as the circular position angle, the distance of intersection to the lower shaft sleeve, and to the strut axis. The research shows that the circular position angle has a great effect that the safe range is 70 degrees to 100 degrees, and the pegrect angle is 75 degrees; and the distance of intersection to the lower shaft sleeve, and to the strut axis that has less effect