航天火工机构可靠性的强化试验验证方法

Reliability Validation on Spacecraft Pyrotechnical Devices Using the Hardened Test Method

针对性能参数服从正态分布的一类航天火工机构,参照＂应力-强度＂模型,提出了一种强化试验的小子样可靠性验证方法。试验中将火工机构性能参数置于相对额定条件更为严酷的条件下,用传统的成败型试验方法评估其可靠性,然后结合火工机构的力学特性推导出它在额定条件下的可靠性。公式的计算验证表明：利用本方法,在0.95的置信度下,只需要少于10次的试验就能够评定0.9999-0.99999的可靠性。最后,文章对强化试验的设计方法进行了说明。

A strength-stress model for the reliability of spacecraft pyrotechnical devices is proposed, based on the mechanical characters of the products and one-shot product reliability assessment theory. From this, a reliability validation method with small sample under hardened conditions was presented. In this method the products are. tested under hardened conditions. If they can still work without failure under such conditions, then the reliability in normal conditions can be calculated by a series of formulas. It indicates that using this method, with the confidence level of 0.95, only less than 10 times trials am needed to validate the reli- ability of 0. 9999 - 0. 99999. Finally, the design of test under severe conditions was described.