| 摘要: |
| 提出了将产品置于极严酷的环境下降低其可靠性，再用经典的方法来推断额定环境下产品可靠性的过载试验方法。阐述了如何利用过载试验的信息评估额定状态下的可靠性，讨论了过载试验设计中确定过载系数及最小过载系数问题，最后以某个发动机壳体试验数据为例作了计算，并分析了评估结果对变异系数的敏感性。算例表明，对额定状态下需作２００～３００次试验考核的产品，如果提高载荷２０％～３０％，则只需作４～５次可靠性试验考核。这种方法对高试验费用的小子样产品可靠性评估具有很好的经济性和实用性。 |
| 关键词: 固体推进剂火箭发动机 结构可靠性 可靠性评价 过载 |
| DOI： |
| 分类号:V414.5 |
| 基金项目: |
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| OVERLOAD TEST METHOD FOR THE STRUCTURAL RELIABILITY ESTIMATION OF SOLID ROCKET MOTORS |
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Zeng Yongsheng,Dai Zuming,Shi Ling,Xie Weimin
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Coll.of Astronautics,Northwestern Polytechnical Univ.,Xi′an,710072
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| Abstract: |
| An overload test method is presented which is used for estimating the reliability of products at normal working conditions classically based on decreasing the product reliability at severe working conditions.At first the procedure of getting the reliability at normal conditions by using information from overload test is discussed,then it focuses on how to plan the overload test and how to determine the overload factor.By the way the problem of minimal overload factor is analysed.Finally the method is applied to the case of a solid rocket motor,and the sensitivity of the estimation result to the coefficient of variation is discussed.It is revealed that 200￣300 tests under normal working conditions can be replaced by 4￣5 tests under the condition of increasing 20%￣30% load.The method is practical and economical when facing situations such as smallsampled products with high test cost |
| Key words: Solid propellant rocket engine Structural reliability Reliability assessment Overload |
