For the effect of piston rod flexibility on landing gear shock absorber energy absorption characteristics,taking oleo-pneumatic shock absorber of civil aircraft strut landing gear as an example,based on the multi-body dynamics theory,using the classic'" two-mass" equivalent model,geometric model considering shock absorber piston rod flexibility is established in Adams/Aircraft and the drop test simulation is carried out.Compared simulation result with rigid simulation result,the results show that the work environment has a tendency to deteriorate between shock absorber outer cylinder and piston rod.When piston rod flexibility down to between 3.31 x 1012 ～ 3.02 x 1012 N ·mm2,shock absorber energy absorption efficiency decreases obviously.Considing piston rod flexibility can make the modeling more conform to reality,which also can provide a reference for the follow-up optimization design of the landing gear structural parameters.%针对活塞杆刚度对起落架缓冲器吸能特性的影响,以某型民机支柱型起落架油气式缓冲器为研究对象,基于多体动力学理论,采用经典的二质量块等效模型,在Adams/Aircraft中建立了考虑缓冲器活塞杆刚度的几何模型;并进行了落震仿真分析.将仿真结果与刚性仿真结果进行对比.结果表明,活塞杆柔性使得缓冲器外筒与活塞杆间的工作环境有恶化的趋势,当活塞杆刚度下降到3.31x1012～3.02×1012N· mm2之间时,缓冲器吸能效率下降明显,此时需考虑活塞杆刚度使得建模更符合真实情况,并能为起落架结构优化设计提供参考.
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