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The fleet life reliability analysis under the 90% severe load spectrum

机译：90％严重载荷谱下的车队寿命可靠性分析

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摘要

The fatigue life scatter of an aircraft fleet includes the variabilities of the material, structural property and the load spectrum. With more and more knowledge on the load variation, the 90% severe durability load spectrum has been proposed in JSSG-2006 of USA and used in the service life assessment program for several aircraft types. However, what is the life reliability of a fleet under this 90% severe spectrum and how severe the load spectrum should be are still perplexing. This paper would discuss the fleet life reliability under the severe load spectrum. Assuming both the fatigue life under a specified load spectrum and the load spectrum damage of a fleet follow the log-normal distribution and the standard deviations are σ_S and σ_L respectively, the fleet life was deduced to follow a log-normal distribution, the log mean life is unchanged and the variation is the sum of σ_S~2 and σ_L~2. The expression of the fleet life reliability P was also deduced and it is influenced by the σ_S and σ_L. The typical values of P were calculated for the cited σ_S and σ_L. To ensure the fleet service safety under the 90% load spectrum, the requirement on the severity degree, P_L, which is also the load reliability, was discussed. It showed that the severity of the severe spectrum is not a constant. If the 90% damage spectrum was used, the standard deviation of load spectrum damage should be controlled less than 0.14 at least.
机译：飞机机队的疲劳寿命分散性包括材料，结构特性和载荷谱的变化。随着对负荷变化的了解越来越多，美国JSSG-2006提出了90％的严格耐久性负荷谱，并将其用于几种飞机的使用寿命评估程序。但是，在这种90％的严峻频谱下，车队的寿命可靠性如何，以及载荷频谱应达到的严峻程度仍令人困惑。本文将讨论在严重载荷谱下的舰队寿命可靠性。假设车队在指定载荷谱下的疲劳寿命和载荷谱损伤均服从对数正态分布，并且标准偏差分别为σ_S和σ_L，则推导出车队寿命服从对数正态分布，即对数均值寿命不变，变化量为σ_S〜2与σ_L〜2之和。还推导出车队寿命可靠性P的表达式，并受σ_S和σ_L的影响。对于引用的σ_S和σ_L计算出P的典型值。为了确保在90％负荷谱下的车队服务安全，讨论了对严重程度P_L的要求，也就是负荷可靠性。结果表明，严重光谱的严重程度不是恒定的。如果使用90％的损伤谱，则载荷谱损伤的标准偏差应控制在至少0.14以下。

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