Abstract
Based on the concept of hydraulic damper energy dissipation, a passive Hydraulic Force Pulse Generator (HFPG) is presented. The design comprises a conical poppet valve inside a cylindrical hole without any seat. By virtue of aperture and orifice throttling, HFPG dissipates the kinetic energy of a rapidly moving object and cushions it to a halt to produce desired acceleration pulse. Prompt and easy adjustment can be achieved to the damping force by changing the size of the orifice set on cylinder. A mathematical model of the cushion process is developed by way of analyzing the internal fluid dynamic phenomenon of HFPG. And numerical simulation results of the model has exhibited the following features of HFPG: high-efficiency of energy dissipation; easy-regulation of acceleration waveform and being suitable in conditions with large momentum change, especially to be used as the negative pulse generator of dual-wave shock testing machines which can simulate the shock environment of underwater explosion.
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