Research On Dynamics Of The Axial Motion Cylindrical Shell

Structural vibration is one of many factors which decide whether the submarine-launched missile can launch successfully.The force of the water-exit process is also a great threat to the structural stability of the submarine-launched missile.Therefore,it is very important to study the water-exit dynamics of missile for the research of submarine-launched missile launch.In this paper,the mechanical model of the submarine-launched missile is simplified as an axially-moving cylindrical shell model,and the vibration differential equation is established.The vibration differential equation is discretized by the Galerkin method,and the numerical simulation is carried out with Matlab.The influence of the length and velocity of the structure on its free vibration characteristics is studied.The response of the shell structure under the wave excitation was analyzed by combining Fourier transform,and the stress changes under different water-exit conditions were obtained.This paper also analyzes the underwater structural modal by Ansys software based on the fluid-solid coupling dynamics theory.The results show that the inherent frequency of the missile structure in water is less than in vacuum.Fluent and Transient are used to simulate the water-exit process of the missile.The phase cloud and the velocity cloud of the missile are obtained,and the stress distribution of the missile structure is also analyzed.