基于状态监测和老化试验的火箭发动机寿命评估方法研究

摘要

The maximal strain value in danger zone of solid rocket motor was determined through structural analysis and state monitoring using micro-sensors. Accelerated aging test was carried out to get tension curve and elongation percentage of the propellant under different aging temperature and time. Relation between mechanical property parameter and aging time was established with chemical reaction speed. The relation between elongation percentage and storage period of propellant at certain temperature was determined. Propellant' s storage life was determined by checking the maximal strain in motor and storage period.%通过分析某型固体火箭发动机的结构,对发动机状态监测系统的微型传感器进行了合理布局,从而得到危险区域的最大应变值.采用加速老化试验,得到推进剂在不同老化温度下延伸率随老化时间的变化曲线.通过化学反应速率,建立不同老化温度下力学性能参数和老化时间的关系,从而确定某贮存温度下推进剂延伸率与贮存时间的关系.将发动机危险点处最大应变与贮存时间的变化关系进行比较,得到推进剂的贮存寿命.