螺栓法兰系统连接可靠性分析方法

考虑系统内零件间的失效相关机理,提出了螺栓法兰连接系统的动态可靠性和失效率模型,指出了传统静态可靠性模型无法精确描述螺栓法兰系统可靠性和失效率的动态特征,并通过算例分析了失效相关对系统可靠性和失效率的影响。结果表明,失效相关对系统可靠性具有较大影响,零件相互独立假设可能引起系统可靠性分析的较大误差;传统恒定失效率假设可能低估系统可靠度;螺栓数量的增加可以增强系统抵抗失效风险能力。

A Method of Connection Reliability Analysis of Bolted Flange Systems

Dynamic reliability models and failure rate models of bolted flange systems were developed, which took into account the failure dependence of components in the systems. It was proposed that the traditional static reliability models could not accurately describe the dynamic characteristics of reliability and failure rate of bolted flange systems. Moreover, the effects of failure dependence on system reliability and failure rate were analyzed via numerical examples. The results showed that the failure dependence had great influences on system reliability. Furthermore, the assumption that components in a system were independent of each other might cause large error in system reliability estimation. Traditional assumption of constant failure rate for mechanical systems might underestimate the system reliability. The increase in the number of bolts could enhance the ability of the system to resist the risk of failure.