针对目前复杂产品研制过程中故障模式消减方案确定主要凭经验,未考虑故障模式之间的耦合关系问题,建立了考虑耦合关系的故障模式消减方案决策过程.首先,提出了故障模式关联集(FMCS,Failure Modes Correlation Set)的概念,并运用演绎理论给出了FMCS的确定方法.其次,根据故障模式消减后其发生概率变化,构建了不同层次产品可靠性指标受影响的模型,并以此为依据,给定面向可靠性指标实现的故障模式消减方案决策方法.最后,以某型直升机燃油系统故障模式消减为例验证了上述方法及模型的可行性,初步证明了可靠性定量指标与定性设计之间存在明确的量化关系,可通过其控制故障模式消减,达到以最少资源消耗和较短研制周期实现满足设计要求的产品的目标.上述方法及模型具有实用性,可进一步在实际工程中推广应用. In view of the fact that the failure mode reduction scheme in the process of developing complex products is mainly determined by experience and the coupling relationship between failure modes is not considered, a decision-making process of failure mode reduction scheme considering the coupling relationship is established.Firstly, the fault pattern association set (FMCS , Failure Modes Correlation Set), and use the theory of deduction to determine the method of FMCS.Secondly, according to the occurrence probability change after the failure mode is reduced, the models of different levels of product reliability index are constructed, which are Based on this, a decision-making method of failure mode reduction scheme based on reliability index is given.Finally, the feasibility of the above method and model is verified by taking the failure mode reduction of a certain type of helicopter fuel system as an example, and the reliability quantitative index and qualitative design are preliminarily proved There is a clear quantitative relationship between the failure mode can be controlled by its reduction to achieve the minimum resource consumption and short development cycle to meet the design requirements of the product target.The above methods and models are practical and can be further promoted in the actual project application.