Simulation and testing of a combined vibration isolator and energy harvester
McDowell, Matthew Dodd
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The design, simulation and testing of a novel vibration isolator and energy harvesting device was performed. The harvester/isolator demonstrates increasing output power and decreasing transmissibility as frequency is increased - both ideal characteristics. The vibration isolating portion of the device was constructed using buckled beams as the stiffness element. Piezoelectric strips were attached to the buckled beams to achieve energy harvesting. Harmonic excitation of varying frequency was introduced to the base of the device while the voltage from the piezoelectric strips and the displacements of the test mass and the base were obtained. The power and the transmissibility were calculated from the resulting data and compared to those determined from a simulation. The structural system was modeled using elastica theory and the resulting dynamic response was used as a forcing on the electrical system. Excellent agreement between simulation and experiment was achieved for both the structural and electrical systems.