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首页> 外文期刊>Journal of the American Helicopter Society >A Critical Analysis of the Six-Nines Reliability Methodology
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A Critical Analysis of the Six-Nines Reliability Methodology

机译：六重可靠性方法论的批判性分析

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The current certification requirements of helicopter dynamic components demand that the probability of failure at the retirement life does not exceed one in a million, i.e. a reliability level of 0.999999 (six-nines reliability). It is therefore imperative that the component retirement time for fatigue-critical rotorcraft dynamic components be. determined using probabilistic rather than deterministic methodologies. In the helicopter industry a method known as 'Top of Scatter-mean minus three standard deviation (TOS/μ- 3σ)) reliability method is commonly used for determining the component retirement time over which the probability of failure is ≤ 10~(-6). In this paper, the results of the TOS/(μ- 3σ) reliability method for an example of constant amplitude loading have been compared with those of an exact analytical solution, Monte Carlo simulation and Second-Moment methods. Examples using Monte Carlo simulation and a numerical approximation are evaluated for variable amplitude loading, where Miner's linear damage summation rule is assumed. Finally, this paper shows that the TOS/(μ- 3σ) reliability method is non-conservative for both constant and variable amplitude loading.
机译：当前对直升机动力部件的认证要求要求在退休寿命时发生故障的概率不超过百万分之一，即，可靠性等级为0.999999（六nines可靠性）。因此，至关重要的是，对于疲劳至关重要的旋翼航空器动态部件，部件退役时间必须保持不变。使用概率而非确定性方法确定。在直升机行业中，通常使用一种称为“散度顶部平均值减去三个标准偏差（TOS /μ-3σ）”的可靠性方法来确定组件的退役时间，在此时间内，故障概率≤10〜（-6 ）。在本文中，已将以恒定振幅加载为例的TOS /（μ-3σ）可靠性方法的结果与精确解析解决方案，蒙特卡洛模拟和Second-Moment方法的结果进行了比较。使用蒙特卡罗模拟和数值逼近的示例对可变振幅载荷进行了评估，其中假设了Miner的线性损伤求和规则。最后，本文表明，TOS /（μ-3σ）可靠性方法对于恒定和可变振幅加载都是非保守的。

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