Structure buckling load interval analysis of supercavitating projectile

As a result of supercavitating projectiles with high underwater velocity, their structures undergo high longitudinal force. It is necessary to perform structure buckling load interval analysis because the uncertainty of structural own parameters should be considered. Critical buckling load of supercavitating projectiles is calculated by Galerkin method. The partial matrixes of critical buckling load implicit function to each uncertainty variable are deduced, and the interval of structure critical buckling load is calculated by interval analysis and convex model methods. Numerical results show that the nominal value, lower and upper bounds of critical buckling load increase with the increment of the ratio of base diameter to cavitator diameter. And the uncertainty degree of basic variables should be controlled as far as possible in the project for high reliability.