内置式框架肋骨加强的长舱段舱段失稳临界压力理论计算方法研究

Analysis on theoretical calculation method of critical pressure for long cabin stiffened by inner all-round frame

文章针对内置式框架肋骨加强的长舱段,推导了框架肋骨临界刚度的理论计算公式,给出了舱段框架肋骨临界刚度的计算方法;通过ANSYS有限元软件,比较分析了舱段失稳临界压力理论公式计算结果与有限元计算结果之间的误差,指出现行舱段失稳临界压力理论计算公式存在一定的适用范围;以舱段失稳压力有限元结果为修正基准值,引入修正系数k修正理论计算公式,以提高理论计算结果的准确性。

A theoretical expression of all-round frame’s critical rigidity which is set in the long cabin is de-duced, and also the way to compute the critical rigidity is introduced. The inaccuracy between the results of analytical formula and finite element analysis is analyzed via ANSYS. It points out that the actual theoreti-cal expression for critical pressure of cabin is available within a certain range. And this paper amends the theoretical expression by k to improve the accuracy which is based on the result of finite element analysis.