Acoustic Energy Harvesting Using Sonic Crystals

摘要: This chapter presents the development of an acoustic energy harvester using sonic crystal and piezoelectric material. A point defect is created by removing a rod from perfect crystal. The in acts as resonant cavity; thus, waves at frequency can be localized within cavity material put into to convert ambient mechanical electrical energy. power generation based on effect wave localization direct plane expansion method employed calculate crystal, finite element adopted obtain pressure particle velocity field mode model for harvesting curved beam also developed predict output voltage harvester. larger associated with Two kinds PVDF films (LDT4-028k LDT2-028k) are placed inside attached rods. When incident 4.2/4.21kHz, maximum generated under load resistance 3.9/15kΩ LDT4-028k/LDT2-028k film, respectively. Piezoelectric materials higher electromechanical coupling should selected improve power. In addition, designed have same cavity. By properties band gaps localizations noise control achieved simultaneously.