O形密封结构广泛应用于航空、船舶等武器装备系统,其密封性能的优劣直接关系到装备的任务成功性.针对现有O形密封设计分析方法未能充分考虑密封元件制造公差、工作介质压力波动等因素对密封性能可靠性的影响和对可靠性指标不能给出量化分析结果,文中以应力-强度干涉理论为依据,构建考虑这些因素的O形密封结构的极限状态函数及其可靠度计算方法,利用FREET机械可靠性分析软件对水下航行器O形密封结构的可靠性进行分析,所得结论可为O形密封结构的设计提供参考.%O-ring seal structure is widely used in the weapon systems of air and ship, and its sealing performance di-rectly affect the operational mission of the weapon systems. The existing design methods of O-ring seal do not suffi-ciently consider the effects of manufacturing tolerance, medium pressure fluctuation, etc., on the reliability of O-ring sealing performance, and cannot give quantitative value of reliability index. In this paper, the stress-strength interference theory is employed to establish a limit state function of O-ring seal structure considering the influencing factors men-tioned above, and corresponding calculation method of reliability is proposed. Then, reliability of the O-ring seal struc-ture for an underwater vehicle is calculated by the software FREET. This study may provide a reference for design of O-ring seal structure.
展开▼
