摘要
随着飞机起落架收放机构的复杂度不断提升,多关节间隙耦合对机构运动精度的影响更加显著。复杂机构的运动精度可靠性问题呈现出非线性程度高、影响参数多、样本量少的特点,研究难度极大。针对该问题,提出了一种结合理论分析、动力学联合仿真以及间隙磨损的机构运动精度可靠性分析方法。首先,建立考虑7处关节间隙的收放机构动力学模型,研究各关节间隙对机构收放精度的独立影响及耦合影响。然后,建立关节磨损量随收放次数增加的分析模型,获取间隙的变化规律,进而建立收放机构运动精度随收放次数变化的可靠性分析模型。最后,基于自适应Kriging代理模型对起落架收放机构的可靠性进行分析,给出可靠性随机构收放次数的变化规律。研究结果表明,各处结构间隙对机构收放运动精度都有不同程度的影响,机构失效概率呈现先平稳后急剧上升的趋势。所提方法为起落架复杂机构运动可靠性评估提供重要的分析手段。
With the increasing complexity of aircraft landing gear retractable mechanism,the effect of multiple structural clearances coupling on the motion accuracy of the mechanism is more significant.The motion accuracy reliability of complex mechanism presents the characteristics of high nonlinear degree,many influencing parameters and small sample size,so it is very difficult to study.For this problem,this paper proposes a method for analyzing the motion accuracy reliability of the mechanism by combining theoretical analysis,dynamics joint simulation,and clearance wear.Firstly,a dynamic model of the retractable mechanism considering seven structural clearances is established to study the independent and coupled effects of structural clearances on the retracting accuracy.Then,the analysis model of the structural wear with the increase of retracting cycles is established to obtain the change rule of clearance,and then the reliability analysis model of retractable mechanism motion accuracy with the change of retracting cycles is established.Finally,based on the adaptive Kriging surrogate model,the reliability of the landing gear retractable mechanism is analyzed,and the variation law of reliability with retracting cycles is provided.The research results show that the structural clearances at different locations have varying degrees of impact on the motion accuracy of the mechanism,and the probability of mechanism failure shows a trend of initially stabilizing and then sharply increasing.The proposed analysis method provides an important analytical means for the motion reliability evaluation of complex landing gear mechanisms.
作者
徐向前
王宁博
印寅
鄢雨濛
魏小辉
聂宏
XU Xiangqian;WANG Ningbo;YIN Yin;YAN Yumeng;WEI Xiaohui;NIE Hong(State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics&Astronautics,Nanjing 210016,China;Shenyang Aircraft Design and Research Institute,Shenyang 110035,China)
出处
《南京航空航天大学学报》
CAS
CSCD
北大核心
2024年第5期909-921,共13页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家自然科学基金(52172368,52275114)
江苏省自然科学基金(BK20220135)。
