Abstract: An apparatus and method for vibration suppression using a granular particle chain. The granular particle chain is statically compressed and the end particles of the chain are attached to a payload and vibration source. The properties of the granular particles along with the amount of static compression are chosen to provide desired filtering of vibrations.

Abstract: An apparatus and method for vibration suppression using a granular particle chain. The granular particle chain is statically compressed and the end particles of the chain are attached to a payload and vibration source. The properties of the granular particles along with the amount of static compression are chosen to provide desired filtering of vibrations.

Abstract: A tunable frequency acoustic rectifier that is a granular crystal composed of a statically compressed one-dimensional array of particles in contact, containing a light mass defect near a boundary. The tunable frequency acoustic rectifier is nonlinear and contains tunable pass and stop bands in their dispersion relation. Vibrations at selected frequencies applied to the granular crystal from the side near the defect will cause the system to bifurcate at a critical input amplitude and subsequently jump to quasiperiodic and chaotic states with broadband frequency content. Some of this frequency content lies within the pass bands and will propagate through the crystal. Vibrations at the same frequencies applied to the other side of the granular crystal will not bifurcate, and little energy is transmitted.