Abstract
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.
Highlights
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 to spare the construction’s cost and to satisfy oil consumption
The aim of this paper is to investigate experimentally the influence of several parameters on the modal damping coefficient above an acceleration’s thresholds to induce relative movement between the beads [6]
The granular material used is glass beads with a diameter of ∅ = 2 mm. This cavity set to vibration by the use of a shaker which excites the system with a sinusoidal observation shows that no stick-times are present and allows us to consider an equivalent viscous damping induced by the amount of granular media
Summary
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 to spare the construction’s cost and to satisfy oil consumption. 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. Weight reduction of structure is an important issue for the transport industry in a way of doing some savings To this mass reduction, an increase of the vibration is observed. The mass of the added beads lead to a vibration reduction This mass effect is completed by damping if relative movement of grains appears inside the granular media. The aim of this paper is to investigate experimentally the influence of several parameters on the modal damping coefficient above an acceleration’s thresholds to induce relative movement between the beads [6]. The finality would be to create a adjustable equivalent viscous damping coefficient which could depend on the principle parameters of the system
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