Designoptimization in geometry of seismic mass for MEMS based cantilever type piezoelectric energy harvester for motor vibrations
- Vol.57(5), May
- New Delhi CSIR 2019
- 334-337p.
Piezoelectric energyharvestersaresuitableforvibrationenergyharvestingduetosimpledesign,operationand fabricationinMEMStechnology.Cantilever structures fixed from one end and seismic mass at the other must tune to different resonance frequency to ensure widebandfrequencyoperation.Adequatewidthtolengthratio ofcantileverisrequiredtoavoidcurlingofcantilevers(bending).Effectofincreaseinwidthofthecantilever structureonresonance frequency has beeninvestigatedand alsocomparedanalytically in this paper.Anoptimizeddesignhas beenproposedwhichcompensatesfor theincreaseinresonancefrequencyduetoincreaseinwidthbychangingthegeometryoftheseismicmass.Wi t h t h e c h a n g e i n ge o me t r y o f s e i s mi c ma s s ashiftincenterofmasshas beenachievedtowardsthefreeendofthecantileverwhichreducestheresonancefrequency which is desirable. Thedesign optimization of seismic mass reportedin this paperreducestheresonancefrequencyby4.27% which is appreciated as it is required to harvest ambient vibrations having low frequency.