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As structure buckling problems easily arise when supercavitating projectiles operate with high underwater velocity, it is necessary to perform structure buckling reliability analysis. Now it is widely known that probabilistic and non-probabilistic uncertain information exists in engineering analysis. Based on reliability comprehensive index of multi-ellipsoid convex set, probabilistic uncertain information is added and transferred into non-probabilistic interval variable. The hybrid reliability is calculated by a combined method of modified limit step length iteration algorithm(MLSLIA) and Monte-Carlo method. The results of engineering examples show that the convergence of MLSLIA is better than that of limit step length iteration algorithm(LSLIA). Structure buckling hybrid reliability increases with the increase of ratio of base diameter to cavitator diameter, and decreases with the increase of initial launch velocity. Also the changes of uncertain degree of projectile velocity and cavitator drag coefficient affect structure buckling hybrid reliability index obviously. Therefore, uncertain degree of projectile velocity and cavitator drag coefficient should be controlled in project for high structure buckling reliability.  相似文献
2.
结合工程实践对OGFC13和OGFC9.5两种级配类型的混合料进行了配合比设计,并通过室内试验对两种级配类型混合料的性能进行分析,结果表明,高黏沥青OGFC13混合料各项性能良好,且OGFC13的原材料选择较为便捷,适合工程的应用与推广。  相似文献
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提出了基于线路服务客流密度最大进行公交线路网设计的优化模型,总结了公交线路网优化设计的方法,并基于其中一种方法建立了线路服务客流密度最大优化模型,通过一个抽象的网络算例,与其它线路网优化策略进行比较,分析了论文提出模型的优越性。  相似文献
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