Abstract
Viscous fluids are used as vibration dampers in applications ranging from isolation tables to cars; they are well understood and easy to engineer. An attractive alternative proposed for turbines, medical applications, and spacecraft is to use granular materials as dampers: Unlike fluids, they are nearly independent of temperature, can operate in harsh environments, and provide damping with no fixed anchor. Unfortunately, there are no design rules for these dampers, so the present paper characterizes effects of amplitude and frequency of oscillation on generic granular dampers. The authors determine broad operating ranges and find that, unlike their fluid counterparts, granular dampers strongly suppress higher-order dynamic resonances.
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