Amplification effect and influencing factors of rebound-collision impact amplifier

Abstract

In strong impact environment, traditional impact test platform cannot obtain high peak acceleration, resulting in products being hindered in the testing process. The objective of this paper is to build the rebound-collision impact amplifier that can be used in a strong impact environment and to investigate its mechanism, influencing factors, and amplification effect. The kinematic model of the rebound-collision impact amplifier was established by combining dynamic contact theory with classical collision theory, considering energy loss, and introducing collision recovery coefficient. A theoretical formula for calculating acceleration and acceleration magnification was derived. The effects of the collision duration ratio, the mass ratio of the amplification platform to the falling platform, and the reserved clearance on the acceleration magnification were investigated, respectively. Finally, the feasibility test was verified. The test results show that the rebound-collision impact amplifier motion model is in good agreement with the theoretical model. Acceleration magnification decreases with increasing mass ratio and increases with increasing collision duration ratio. The ideal reserved clearance can be found to make the acceleration of the amplification platform obtain the maximum value. Selecting the ideal reserved clearance is more conducive to impact amplification.