DYNAMICS AND STABILITY OF GUN-BARRELS WITH MOVING BULLETS

Document Type : Original Article

Authors

1 Egyptian Air-force, Cairo, Egypt.

2 Modeling and Simulation in Mechanics, German University in Cairo.

3 Mechanical Engineering Department, British University in Egypt, Cairo, Egypt.

4 Aerospace Engineering Department, Cairo University, Cairo, Egypt.

Abstract

ABSTRACT
In this study, the stability of a Timoshenko beam under the effect of a moving projectile
will be reintroduced using simple eigenvalue analysis of a finite element model. The
eigenvalues of the beam change with the mass, speed, and position of the projectile,
thus, the eigenvalues are evaluated for the system with different speeds and masses at
different position until the lowest eigenvalue reaches zero indicating the instability
occurrence. Then the dynamics of the beam will be investigated using the Newmark
algorithm at different values of speed and mass ratios. It is concluded that the
technique used to predict the stability boundaries is simple, accurate, and reliable.

Keywords