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一、前言 航天产品大多属于“单次系统”,在一次使用后无论是否完成任务都不能重复使用。使用前要确保其待命状态,而使用时又要确保其万无一失,这就要求有极高的固有可靠性和使用可靠性。然而航天产品所处的工作环境十分恶劣,在复杂的随机静、动载荷,强腐蚀性介质(推进剂等),强烈的振动(次同步振动)、高速、高温、高压、低温以及摩擦,辐照等苛刻条件下,就有可能丧失其规定的功能——即失效。
I. INTRODUCTION Most aerospace products are “single-system” and can not be reused after one use regardless of whether the task is completed or not. Before use to ensure that the standby state, and use to ensure that its foolproof, which requires a very high inherent reliability and reliability. However, the aerospace products are in a very harsh working environment. In complex random static and dynamic loads, highly corrosive media (propellants etc.), strong vibration (subsynchronous vibration), high speed, high temperature, high pressure, low temperature and friction, Under such harsh conditions, it is possible to lose its prescribed function - that is, failure.