A scalable concept for micropower generation using flow-induced self-excited oscillations

St. Clair, D.; Bibo, A.; Sennakesavababu, V. R.; Daqaq, M. F.; Li, G.
April 2010
Applied Physics Letters;4/5/2010, Vol. 96 Issue 14, p144103
Academic Journal
Inspired by music-playing harmonicas that create tones via oscillations of reeds when subjected to air blow, this paper entails a concept for microwind power generation using flow-induced self-excited oscillations of a piezoelectric beam embedded within a cavity. Specifically, when the volumetric flow rate of air past the beam exceeds a certain threshold, the energy pumped into the structure via nonlinear pressure forces offsets the system’s intrinsic damping setting the beam into self-sustained limit-cycle oscillations. The vibratory energy is then converted into electricity through principles of piezoelectricity. Experimental and theoretical results are presented demonstrating the feasibility of the proposed concept.


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