Free oscillations of liquid-fluid package-assembled rocket carrier missiles

摘要

We present software for the numerical simulations of the dynamic characteristics for the liquid-fuel package-assembled rocket carrier missiles. To define the dynamic model of the mechanical and hydraulic system, we applied finite elements with reduced piecewise-homogeneous distributed (beam type) and concentrated parameters of the stiffness and inertia characteristics were used, for the oscillating fluid mass the pendulum schemes were applied. The calculation results of the base frequencies and oscillation modes of the design version of the rocket carrier missile for the initial flight stage were obtained. The effect of the rotation inertia and shear strain for the components of the beam type on the calculation values of the base frequencies was studied. The convergence of the finite-element solution was investigated.