Cantilever structure placed in liquid sandwiched between soft-thin membranes to realize wide bandwidth harvester

A wideband energy harvester is required for equipment whose vibration frequency fluctuates in low-frequency bands, such as a motor or a pump. This study proposes a cantilever structure, in which a cantilever (length = 10 mm, width = 10 mm, and thickness = 0.1 mm) is placed in a structure containing a liquid (viscosity = 50 mm2/s and specific gravity = 0.96) between two soft thin membranes (thickness = 0.007 mm). The liquid increases the bandwidth of the cantilever by virtue of its viscous resistance. By vibrating the liquid up and down, a resonant frequency is generated due to the motion of the liquid. Based on measurements with prototypes, we confirmed that the bandwidth of the resonant frequency (100 Hz) with liquid is 450% wider than that of a cantilever in air. A weight was used to adjust the resonant frequency of the latter.

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