Experimental added modal damping induced by confined granular media on a single degree of freedom system
1 IRT Jules Verne, Chemin du Chaffault, 44340 Bouguenais, FRANCE
2 LAUM UMR 6613, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, FRANCE
Published online: 30 June 2017
The use of granular media to induce vibration energy’s dissipation in lighter huge industrial structures permits to decrease the mass of the structure and consequently to spare the construction’s cost and to satisfy oil consumption. In fact, when the structure in which the granular media is in contact overtakes an acceleration threshold, relative movements of the grains appears which lead to a dissipation of energy. When the grains are confined inside a cavity, the dissipation’s level depends on several parameters (the acceleration’s amplitude, the frequency, the grain’s characteristics, the cavity’s dimensions, the cavity’s filling ratio, the fluid between the particles, etc.). This study quantifies the influence of several parameters by exciting uniformly a given volume of grains. A modal damping coefficient of a single degree of freedom system (SDOF) can be thus calculated as a function of the preceding parameters.
© The Authors, published by EDP Sciences, 2017
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