不平整跑道激励下飞机起落架随机响应及可靠性分析  

Random response and reliability analysis of aircraft landing gearunder uneven runway excitation

作　　者：张莹[1] 金峥嵘 贾万涛 刘小川[2] 许勇[1] ZHANG Ying;JIN Zheng-rong;JIA Wan-tao;LIU Xiao-chuan;XU Yong(School of Mathematics and Statistics,Northwestern Polytechnical University,Xi′an 710129,China;Aircraft Strength Research Institute of China,Xi′an 710065,China)

机构地区：[1]西北工业大学数学与统计学院,陕西西安710129 [2]中国飞机强度研究所,陕西西安710065

出　　处：《振动工程学报》2024年第3期497-504,共8页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(12172286,11872306);航空科学基金资助项目(201941053004)。

摘　　要：采用非线性二自由度系统构建了飞机起落架模型,通过时域噪声刻画了不平整跑道对飞机起落架系统的随机激励,并引入路面不平度系数描述了跑道的不平整程度;基于飞机起落架模型响应的概率密度函数及其统计量,开展了不平整跑道对飞机起落架系统影响规律的研究。应用随机可靠性分析方法以及人体振动舒适性理论,通过建立安全域和舒适域与系统响应之间的关系,分析了起落架模型在不同路面不平度系数下的可靠性,并对乘客舒适性进行了评价。研究结果表明:路面不平度系数越大,系统状态变量的波动越剧烈,系统的可靠性和舒适性与路面不平度系数呈一定的负相关性;在路面不平度系数较小的情况下,系统平均首次穿越时间以及舒适性受随机扰动的影响更加显著。A nonlinear two-degree-of-freedom system is used to construct an aircraft landing gear model.The stochastic excitation of the uneven runway to the system is described by time-domain noise,and the road roughness coefficient is used to describe the roughness of runway.Based on the probability density function and the statistics of system response,the influence of uneven run-way on aircraft landing gear system is investigated.The reliability of the landing gear model and the passenger comfort under differ-ent road roughness coefficients are analyzed by establishing the relationship between the safety zones,comfort zones and the sys-tem response.The results show that the larger the road roughness coefficient is,the more fluctuation of the system state variable will be.The reliability and comfort of the system are negatively correlated with the road roughness coefficient.In addition,when the road roughness coefficient is small,the mean first-passage time and comfort of the system are more significantly affected by ran-dom disturbance.The present paper provides a theoretical basis for aircraft riding comfort and landing gear development and design.

关 键 词：飞机起落架 随机响应 可靠性 跑道不平整 

分 类 号：V271.1[航空宇航科学与技术—飞行器设计] O324[理学—一般力学与力学基础] O213.2[理学—力学]