A New Hybrid Reliability Index Definition and Its Application to the Structure Buckling Reliability Analysis of Supercavitating Projectiles
A New Hybrid Reliability Index Definition and Its Application to the Structure Buckling Reliability Analysis of Supercavitating Projectiles作者机构:Department of Unmanned Aerial Vehicle Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China North Norinco Group Beijing 100089 China
出 版 物:《Journal of Shanghai Jiaotong university(Science)》 (上海交通大学学报(英文版))
年 卷 期:2016年第21卷第4期
页 面:467-471页
核心收录:
学科分类:07[理学] 08[工学] 081402[工学-结构工程] 070104[理学-应用数学] 081304[工学-建筑技术科学] 0813[工学-建筑学] 0814[工学-土木工程] 0701[理学-数学]
基 金:the National Natural Science Foundation of China(No.51305421) the National Defense Technology Basis Research Project(No.JSZL2014130B005) the Development of Science and Technology Project of Jilin Province(No.20140520137JH)
主 题:supercavitating projectile structure buckling hybrid reliability modified limit step length iteration algorithm (MLSLIA) Monte-Carlo method
摘 要: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.