A Study of Dynamic Impact Models for Pile-Driver Breech Fatigue System
ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY BENET LABS
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A lumped parameter approach to simulate the impact behavior of the impact pile-driver breech fatigue system is hereby presented. The goal is to investigate the fundamental characteristics of current system and find further improvement of hardware. To model and simulate the highly nonlinear behavior of the system, a good contact force model is essential. With this analysis, a hysteresis damping function is incorporated in the impact force model in order to achieve a desirable impact behavior of an impact pile driver and it allows accurate impact force modeling to simulate a realistic pressure time pulse pattern. Using the nonlinear contact force model, it is found that reliable results for the impact force can be achieved as the impact velocity increases. Finally, the numerical studies are compared with experimental measurements. It is shown that by selecting the proper contact stiffness and damping the chamber pressure pattern, which means the actual chamber pressure in the live firing of gun tube, can be created and controlled.
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