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航空学报  2013 

基于Fokker27飞机过载-超越数曲线族的严重超越数包线选取

DOI: 10.7527/S1000-6893.2013.0144, PP. 840-845

Keywords: 疲劳,寿命,严重谱,载荷谱,超越数

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Abstract:

以Fokker27机群的过载-超越数曲线族为基础,建立了严重谱对应的严重超越数包线的获取方法。首先对外场使用的Fokker27飞机机群的过载-超越数曲线进行筛选,得到59架飞机的过载-超越数曲线,采用线性累积损伤理论计算得到59架飞机每次飞行的损伤;假定机群载荷损伤服从对数正态分布,以严重谱下安全寿命满足机群寿命可靠度要求为准则,给出了严重谱的损伤程度。其次,采用对数正态分布描述指定过载下超越数的分布特性,外推得到满足损伤要求的严重超越数包线及对应的概率要求。结果表明,Fokker27飞机严重过载-超越数曲线包线对应的超越数增量为1.117倍标准差。

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