外压圆筒临界失稳压力的概率分布_刘小宁.pdf

33 　2 　　　　　　 Vol.33　No.2 2004 3 　　　　　　　 　　　　　PETRO-CHEMICAL EQUIPMENT　　 　　　　　　　　　　　 Mar.2004 :1000-7466(2004)02-0007-04 (, 　430015) :应用数理统计方法对钢制薄壁外压圆筒的临界失稳压力进行分析, 得到如下 论:①在显著 度为5%时, 描述临界失稳压力实测值与预测值之比的随机变量符合正态分布。②在置信度为 99%时, 该随机变量分布参数为, 均值 μ=0.957 9, 标准差S =0.110 9, 变异系数 C =0.115 8。 r r r 　　:;;; :TH 49;TQ 051.3　　　:A Research on probability distribution of critical pressure in buckling for the thin steel walled external pressure vessel LIU Xiao-ning (Wuhan Polyt chnic Coll g of Industry Communication, Wuhan 　430015, China) Abstract:By using th m thod of statistics, th critical pr ssur in buckling for th thin st l wall d xt rnal pr ssur v ss l is analyz d.Th r sults shows that:①Th ratio of th critical pr ssur in buckling and th th ortical xp ct d valu is a random vari- abl with normal distribution, and with th mark d of 5%。②With th confid nc limit of 99%, th distribution param t r of th random variabl is obtain d. : xt rnal pr ssur v ss l;critical pr ssur in buckling;random variabl ;distribution param t r Key words 　　　 p ———() r =p ′ p c 2 c th p ′ E 、D 、δ、L , c ——— o N ——— (p p )———p p