Berlin 2005 – scientific programme

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DY: Dynamik und Statistische Physik

DY 34: Poster

DY 34.89: Poster

Monday, March 7, 2005, 15:30–18:00, Poster TU D

Acoustic measurement of velocity-dependent coefficients of restitution — •A. Butsch, C.A. Krülle, and I. Rehberg — Experimentalphysik V, Universität Bayreuth, D-95440 Bayreuth

There are many ways to measure the restitution coefficient of an impact between a vertically falling sphere and a smooth horizontal surface. A very simple and practical method was suggested by Alan D. Bernstein (Am. Jour. Physics 45, 41 (1977)). It is based on the analysis of the sound signal produced by the collision between a falling sphere and a horizontal surface. The required instruments for this experiment are a microphone and a computer with a sound card for recording and evaluation of the stored data. The aim of this project is to determine the coefficient of restitution for beads of different material and size. We are especially interested in the dependency of the restitution coefficient on the impact velocity. The obtained data will serve for modelling of the transport behavior of granular matter under vibration.