基于载荷分级代表性条件的TWIST载荷谱离散方法  

TWIST load spectrum discrete method based on representative conditions of load classification

作　　者：马宏图 杨凤田 丁京龙 李东辉[4] MA Hongtu;YANG Fengtian;DING Jinglong;LI Donghui(Shenyang Aircraft Design and Research Institute,Shenyang 100135,China;Liaoning General Aviation Academy,Shenyang 110136,China;Shanghai Aircraft Design and Research Institute,Shanghai 201210,China;College of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China)

机构地区：[1]沈阳飞机设计研究所,沈阳100135 [2]辽宁通用航空研究院,沈阳110136 [3]上海飞机设计研究院,上海201210 [4]沈阳航空航天大学航空宇航学院,沈阳110136

出　　处：《兵器装备工程学报》2023年第12期105-110,共6页Journal of Ordnance Equipment Engineering

摘　　要：增量突风载荷极值对数正态分布是TWIST载荷谱离散的关键要求,现有离散方法存在求解变量较多,载荷分级代表性不足的问题。基于载荷分级代表性条件,提出了一种满足增量突风载荷极值对数正态分布的单迭代变量TWIST载荷谱离散方法。推导了载荷分级代表性条件,得到各级增量载荷极值及其边界所对应的累积超越飞行概率的递推公式;通过增量突风载荷高载截取值求解出各类飞行的飞行次数;以对数正态分布的标准差为迭代变量,利用高载截取值和低载删除值确定了对数正态分布的参数,进而求解出各级离散载荷。通过欧洲10乘10谱和波音5乘5谱2个算例,验证了所提出方法的有效性。The log-normal distribution of incremental gust load extremum is the key requirement for TWIST load spectrum discretization,and the existing discrete methods have the problem of multiple variables and insufficient representation of load classification.Based on the representative conditions of load classification,a single-iteration variable TWIST load spectrum discretization method that satisfies the log-normal distribution of the extreme values of the incremental gust loads is proposed.Firstly,the representative conditions of load classification are derived,and then the recursive formulas of the cumulative flight probability of exceedance corresponding to the extreme-value of incremental load at all levels and their boundaries are obtained.Then,the number of flights of each flight type is solved by the clipping value of incremental gust load.Taking the standard deviation of the log-normal distribution as the iteration variable,the parameters of the log-normal distribution are determined by using the clipping value and the truncation value,and then the discrete loads at all levels are solved.The effectiveness of the proposed method is verified by two examples,the European 10 by 10 spectrum and the Boeing 5 by 5 spectrum.

关 键 词：TWIST载荷谱 对数正态分布 增量突风载荷 载荷分级 累积超越飞行概率 

分 类 号：V215.5[航空宇航科学与技术—航空宇航推进理论与工程]