Wave Coupling and Resonance in Gun Tubes
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
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Uncommonly large dynamic strains observed during the firing of a 120- mm gun tube have been found to be due to a projectile velocity which causes resonant type behavior of a particular axisymmetric wave. The theory explaining this phenomenon is reviewed and extended to show the potential for excitation of nonaxially symmetric waves through coupling when the tube has an eccentric bore. These non-axially symmetric waves, one of which resonates at a projectile velocity extremely close to that which causes axisymmetric resonance, cause a beamlike motion of the gun tube which can affect accuracy at the target. Keywords Wave motion in solids Critical velocity theory Vibrations Interior ballistics Gun barrels Resonance Strain mechanics Flexural waves resonance.