【作者】 刘浩；

【导师】 刘博林； 纪玉杰；

【作者基本信息】 沈阳理工大学 ， 机械设计及理论， 2025， 硕士

【摘要】 随着人们对乘用飞机出行的需求不断增加,航空安全问题受到了更加广泛的关注。对于民用飞机而言,行驶安全性在很大程度上取决于起落架系统性能的优劣。此外,随着飞机空地循环周期的缩短,客机起飞、降落次数日趋增加,这对起落架系统的可靠性提出了更高的要求。为了获得更加准确的起落架系统可靠性信息,本文以某型客机的前起落架为研究对象,考虑起落架系统具有的多种失效模式,对其进行系统可靠性研究,本文主要的研究内容如下:(1)首先,对前起落架结构进行分析,获得其结构可靠性各失效模式。此外,通过对其收放机构的运动学分析,确定前起落架系统机构运动功能可靠性各失效模式。由于飞机前起落架系统结构复杂,影响因素繁杂,难以获得前起落架系统各失效模式的显式功能函数。因此,需要对起落架进行静力学与动力学数值仿真以获得各失效模式的输出响应。(2)为降低仿真成本,本文采用代理模型方法替代复杂的数值计算。为了提高代理模型的构建效率,基于AK-MCS模型,提出一种改进的IU学习策略及学习准则。采用数值算例与工程算例验证了AK-MCS-IU方法的有效性。(3)对于具有相关性的复杂系统可靠性分析问题,基于MRGP多输出代理模型并结合IU学习策略,提出能够考虑多失效模式相关性的MRGP-IU系统可靠性分析方法。并将所提方法应用于前起落架系统可靠性分析上,同时利用MRGP-IU模型对起落架系统进行灵敏度分析,获得对失效概率影响较大的输入随机变量。更多还原

【Abstract】 As the demand for air travel continues to increase,aviation safety is being given more widespread attention.For civilian aircraft,the safety of takeoff and landing is largely influenced by the performance of the landing gear system.Additionally,with the reduction in air-ground cycle time,the frequency of takeoffs and landings of passenger planes is increasing,resulting in higher demands being placed on the reliability of the landing gear system.To obtain more accurate information regarding the reliability of the landing gear system,this study focuses on the front landing gear of a specific type of passenger plane,with various failure modes of the landing gear system being considered.The main aspects of the research are as follows:(1)The structure of the front landing gear is analyzed,and the reliability failure modes of the landing gear structure are identified.Furthermore,the reliability failure modes of the functional movement of the retracting and extending mechanism of the front landing gear system are determined through kinematic analysis.Due to the complexity of the structure and the numerous influencing factors of the front landing gear system,the explicit functions of the failure modes are challenging to obtain.Therefore,static and dynamic numerical simulations are conducted to determine the input-output responses for each failure mode.(2)To reduce simulation costs,surrogate models are utilized to replace complex nu-merical calculations.To enhance the efficiency of surrogate model construction,a modi-fied IU learning strategy and a learning criterion based on the AK-MCS model are pro-posed.The effectiveness of the AK-MCS-IU method is demonstrated through numerical and engineering examples.(3)For reliability analysis problems involving complex systems with related failure modes,a reliability analysis method that considers the correlation of multiple failure modes is developed based on the multi-output surrogate model MRGP.This method is applied to the reliability analysis of the landing gear system.Additionally,the MRGP model is employed to conduct sensitivity analysis,identifying the random variables that exert the greatest influence on the failure probability.更多还原