In this article, common cause failure, which has contributed more and more failures of complex systems, is integrated to the reliability allocation process. Factors that are used to weight the components are proposed as failure severity, improvement effort, coupling strength, and fragility. Failure severity in the context of common cause failure (CCF) is calculated based on the component's expected marginal contribution to different common cause component groups. The alpha factor model is employed to generalize the reliability improvement effort for CCF. Mathematical formulation for calculating the coupling strength is developed to explore how the CCF affects the factors. A reliability improvement rate is developed to achieve a valid reliability improvement for each component. This kind of allocation considers the component reachability for a given reliability improvement target. Application frameworks of the proposed method to series and parallel systems are constructed. Two illustrative examples are presented to demonstrate that the proposed approach is more effective for proportionally assigning the system reliability requirements in the context of CCF.

中文翻译：

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考虑共因故障的可靠性改进分配方法

在本文中，导致复杂系统越来越多的故障的共因故障被整合到可靠性分配过程中。用于衡量组件权重的因素被提议为故障严重性、改进工作、耦合强度和脆弱性。共因故障 (CCF) 上下文中的故障严重性是根据组件对不同共因组件组的预期边际贡献来计算的。α 因子模型用于概括 CCF 的可靠性改进工作。开发了用于计算耦合强度的数学公式，以探索 CCF 如何影响这些因素。开发可靠性改进率以实现每个组件的有效可靠性改进。这种分配考虑了给定可靠性改进目标的组件可达性。构建了所提出的方法在串联和并联系统中的应用框架。提供了两个说明性示例，以证明所提出的方法对于在 CCF 上下文中按比例分配系统可靠性要求更有效。