In order to achieve a better understanding of the properties of granular media in a dense packing, the propagation of sound in such systems is studied numerically. In this paper, I study the depth dependence of the sound propagation speed in granular media for a single pulse. I find that for the simulated cases the speed of sound does not behave like the postulated power law. Also, I will discuss the amplitude and phase distribution in a rectangular box if the system is continuously excited. I find a strong localization of the peaks of the amplitudes in accordance with the results for a very simplified model by Leibig [Phys. Rev. E 49, 1647 (1994)].
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Stephan Melin (1994) studied this question.
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