考虑非精确概率的起落架运动机构可靠性分析  

Reliability Analysis of Landing Gear Motion Mechanism Considering Imprecise Probability

作　　者：李华 李涛 LI Hua;LI Tao(AVIC Landing Gear Co.,Ltd.,Hanzhong 723200,Shaanxi,China)

机构地区：[1]中航起落架有限责任公司,陕西汉中723200

出　　处：《力学季刊》2024年第4期920-930,共11页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金(12202149)。

摘　　要：开展起落架运动机构可靠性分析对保障飞机正常起飞降落起到至关重要的作用.为提高非精确概率条件下起落架运动机构的可靠性分析效率,发展出一种非精确概率方向抽样法.首先,对所建立的起落架多体动力学仿真模型进行参数化处理,考虑输入变量含区间分布参数的情形,依据工程实际建立极限状态函数,形成可靠性分析模型;其次,将非精确概率随机模拟方法与方向抽样法相结合,推导各分量函数的表达式及估计误差,形成非精确概率方向抽样法,改善当前方法在高度非线性极限状态面情形下计算效率偏低的问题;最后,通过数值算例验证所提方法的有效性,并采用所发展方法对起落架运动机构重要分量的失效概率变化曲线进行计算分析,为提高非精确概率情形下的可靠性分析效率提供了一种新的思路和方法.Conducting reliability analysis of landing gear motion mechanisms plays a crucial role in ensuring normal takeoff and landing of aircraft.To improve the efficiency of reliability analysis of landing gear motion mechanisms under imprecise probability conditions,an imprecise probability directional sampling method has been developed.First,parameterization of the established multi-body dynamics simulation model of the landing gear is conducted.Consider the case where the input variables contain interval distribution parameters,a limit state function based on the actual engineering parameters is established to form the reliability analysis model.Secondly,combining the imprecise probability random simulation method with the directional sampling method,the expressions and estimation errors of each component function are derived to form the imprecise probability directional sampling method,which improves the low computational efficiency of the current method in highly nonlinear limit state surface situations.Finally,the effectiveness of the proposed method is verified through a numerical example.The developed method was used to calculate and analyze the failure probability change curve of important components of the landing gear motion mechanism,providing new thoughts and methods for improving the reliability analysis efficiency in imprecise probability situations.

关 键 词：起落架运动机构 非精确概率 方向抽样法 可靠性分析 灵敏度分析 

分 类 号：V226[航空宇航科学与技术—飞行器设计]