3 Innovative Piezoelectric Cantilever Beam Shape for Improved Energy Harvesting 23 Fig. 3.3 Maximum electric potential versus normalized frequency in the first natural frequency (100 Hz) Normalized frequency (f/f1) 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Maximum electric potential (V) 0 1 2 3 4 5 6 7 inversed S-shaped energy harvester straight energy harvester Fig. 3.4 Average electric potential along the upper piezoelectric layer length versus normalized frequency in the first natural frequency (100 Hz) Normalized frequency (f/f1) 0.4 0.6 0.8 1.0 1.2 1.4 1.6 inversed S-shaped energy harvester straight energy harvester Average electric potential (V) −2 −1 0 1 2 3 Fig. 3.5 Electric potential per length of upper piezoelectric layer versus normalized frequency in the first natural frequency (100 Hz) Normalized frequency (f/f1) 0.4 0.6 0.8 1.0 1.2 1.4 1.6 inversed S-shaped energy harvester straight energy harvester Electric potential (V.m) −0.10 −0.05 0.00 0.05 0.10 0.15 0.20 Reference 1. Roundy S, Wright PK, Rabaey JM (2004) Energy scavenging for wireless sensor networks with special focus on vibrations. Kluwer, Boston 2. Sodano HA, Inman DJ, Park G (2005) Generation and storage of electricity from power harvesting devices. J Intell Mater Syst Struct 16:67–75 3. Jung HJ, Kim IH, Jang SJ (2011) An energy harvesting system using the wind-induced vibration of a stay cable for powering a wireless sensor node. Smart Mater Struct 20:075001 4. Jung HJ, Park J, Kim IH (2012) Investigation of applicability of electromagnetic energy harvesting system to inclined stay cable under wind load. IEEE Trans Magn 48:3478–3481 5. In-Ho Kim, SeungSeop Jin, Seon-Jun Jang, Hyung-Jo Jung (2014) A performance-enhanced energy harvester for low frequency vibration utilizing a corrugated cantilevered beam. Smart Mater Struct 23:037002. (7 pp)
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