基于试验设计和核密度估计的飞机结构载荷概率分布确定  

作　　者：李飞[1] 

机构地区：[1]中国飞行试验研究院,西安710089

出　　处：《科技创新与应用》2023年第17期1-4,共4页Technology Innovation and Application

摘　　要：可靠性设计准则能够定量考核各种随机因素影响,能使飞机结构的安全性和经济性趋于最优,因此建立相应验证方法以预计结构发生有害变形和破坏的概率具有重要的理论价值和工程意义。考虑到载荷概率分布确定是可靠性设计准则试验验证的核心工作,该文以某型飞机起落架载荷谱实测为例,利用试验设计(DOE)完成试飞方案设计,选取匹配样本数据之后,采用核密度估计(KDE)得到载荷概率密度函数和概率分布函数,并通过K-S检验完成拟合度和正确性验证。结果表明,试验设计能以较少的试飞架次模拟飞机结构的实际受载情况;核密度估计可有效解决小子样实测样本数据量不足的问题,为后续其他复杂不规则分布的拟合提供有益的参考和借鉴。Reliability design criteria can quantitatively assess the influence of various random factors,and can optimize the safety and economy of aircraft structures.Therefore establishing corresponding verification methods to predict the probability of harmful deformation and failure of structures has important theoretical value and engineering significance.In view of the determination of aircraft load probability distribution is the core work of reliability design criteria test verification,this paper takes the actual measurement of landing gear load spectrum of an aircraft as an example,the flight test plan is completed through Design Of Experiment(DOE),after selecting the matching sample data,the probability density function and probability distribution function are obtained by Kernel Density Estimation(KDE),and the fitting degree and correctness are verified by Kolmogorov-Smirnov test.The results show that DOE can simulate the actual load condition of aircraft structure with fewer flight test sorties;KDE can effectively solve the problem of insufficient measured data for small samples,it provides useful reference for the subsequent fitting of other complex irregular distributions.

关 键 词：可靠性设计准则 飞机结构载荷 概率分布 试验设计 核密度估计 K-S检验 

分 类 号：V215.1[航空宇航科学与技术—航空宇航推进理论与工程]