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中文摘要：
针对某无人机在飞行试验中出现的缓冲器卡滞问题,以其半轴式主起落架为研究对象,建立了包含半轴式机轮载荷作用下缓冲支柱摩擦力模型的落震动力学分析模型,采用数值分析方法编程求解了其落震动力学特性,与试验结果符合较好.进而对半轴长度和缓冲器全伸长上、下轴承距离等结构参数对缓冲器摩擦力以及落震性能的影响进行了研究.研究表明：半轴式起落架缓冲器摩擦力占缓冲器轴力的比值远比一般缓冲器要大;半轴长度和缓冲器上、下轴承初始间距对缓冲器摩擦力影响很大,半轴长增加20 mm可造成缓冲器摩擦力增大17.9％,轴承初始间距减小5％可造成缓冲器摩擦力增大39.6％.
英文摘要：
Due to the offset of wheel axle center,the forces acting on the shock strut of landing gears are different from those with symmetrical wheel configuration.To solve the binding problem which occurs in the flight test of an unmanned aircraft,the main landing gear of the aircraft was chosen to analyze its drop dynamics.The drop dynamics was modeled with taking into account of the friction force of the half-axle landing gear.Based on the numerical calculation method,the drop dynamics of the landing gear was analyzed.The numerical calculation results verified those from drop test.Furthermore,the influence of halfaxle length and initial length between upper and lower bearings on drop dynamics were analyzed.Studies showed that the friction force of the half-axle landing gear was much bigger than the general landing gear.The half-axle length and the initial length between upper and lower bearings had a great effect on the shock strut friction force.20mm longer of half-axle length could lead to 17.9％ growth of shock strut friction force,and 5％ shorter of initial length between upper and lower bearings could lead to 39.6 ％ growth of shock strut friction force.
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