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The simulation of granular particles in a quasi two-dimensional containerunder the vertical vibration as an experimental accessible model for granulargases is performed. The velocity distribution function obeys anexponential-like function during the vibration and deviates from theexponential function in free-cooling states. It is confirmed that thisexponential-like distribution function is produced by Coulomb's friction force.A Langevin equation with Coulomb's friction is proposed to describe the motionof such the system.Comment: 4 pages, 4 figures. to be published in Journal of Physical Society of  Japan Vol.73 No.

Non-Gaussian Velocity Distribution Function in a Vibrating Granular Bed