舰载机起落架突伸性能参数敏感性分析

Sensitivity Analysis of Fast-extension Performance of Carrier Based Aircraft Landing Gear to Varying Parameters

以配置优化变截面油针的双腔油气缓冲器为研究对象,基于经典的二质量弹簧-阻尼动力学模型,从一组原始参数出发,考察了低压腔初始压力、高低压腔转换支柱临界行程位置、轮胎预压缩量以及油液缩流系数等起落架结构与充填参数的变化对舰载机突伸性能的影响。数值仿真结果表明,以上各参数对突伸性能的影响有别于它们对缓冲性能的作用,并且对振荡特性和突伸时间的影响还各有侧重,一起构成了起落架突伸性能参数敏感性分析的完整性。

Taking into consideration the performance of an oleo-pneumatic shock absorber with a dual-chamber equipped with an optimal metering pin,a model is constructed by two-mass-blocks,an air-spring and oil-damping so as to describe the dynamical responses of the fast-extension of the landing gear of a carrier based aircraft.Based on this model,the effect of the variation of a set of structural and filling parameters from the ori-ginal design data on the fast-extension performance of the landing gear is studied,including the initial pressure of the low-pressure air chamber,the critical stroke position,the pre-pressed amount of the tires and the contraction coefficient of the oil.The results of the numerical simulation show that the impact of the variation of these parameters on the fast-extension performance is different from that on the buffering performance,and that their effects on the oscillation characteristics and time-interval of the fast-extension performance are also different from each other.All of these issues present a complete explanation for the parameter sensitivity of the fast-extension performance of the landing gear.