COMPACTION AND DENSITY FLUCTUATIONS IN VIBRATED GRANULAR MEDIA
| Autor: | Arif Ozbay, A. C. B. Barnum, Edmund R. Nowak |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Vibration
Materials science Steady state Condensed matter physics Control and Systems Engineering Relaxation (NMR) Time evolution Non-equilibrium thermodynamics Granular compaction packing noise nonlinear dynamics nonequilibrium thermodynamics Granular material Noise (electronics) Intensity (heat transfer) |
| Zdroj: | Advances in Complex Systems. (04):389-396 |
| Popis: | We report measurements of the density of a vibrated granular material as a function of time or taps. The material studied consists of monodisperse spherical glass beads confined to a long, thin cylindrical tube. Changes in vibration intensity are used to induce transitions between two steady state densities that depend on the intensity of the vibrations. We find a complex time evolution similar to previous work on the irreversible relaxation from a loose state toward a steady state. In addition, frequency dependent third order moments of the density fluctuations are measured. The data indicate a coupling between large variations in density on one time scale and noise power over a broad range of higher-frequency scales. |
| Databáze: | OpenAIRE |
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