期刊
CRYSTALS
卷 11, 期 6, 页码 -出版社
MDPI
DOI: 10.3390/cryst11060643
关键词
phononic crystal; phononic band gap; defect band; energy localization; piezoelectric energy harvesting; broadband
资金
- National Research Foundation of Korea (NRF) - Korea Government (MSIT) [2020R1A2C3003644]
- National Research Foundation of Korea [2020R1A2C3003644] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study introduces a novel design concept for phononic crystals, examining differently configured double defects to achieve broadband elastic wave energy localization and harvesting.
Several previous studies have been dedicated to incorporating double defect modes of a phononic crystal (PnC) into piezoelectric energy harvesting (PEH) systems to broaden the bandwidth. However, these prior studies are limited to examining an identical configuration of the double defects. Therefore, this paper aims to propose a new design concept for PnCs that examines differently configured double defects for broadband elastic wave energy localization and harvesting. For example, a square-pillar-type unit cell is considered and a defect is considered to be a structure where one piezoelectric patch is bonded to a host square lattice in the absence of a pillar. When the double defects introduced in a PnC are sufficiently distant from each other to implement decoupling behaviors, each defect oscillates like a single independent defect. Here, by differentiating the geometric dimensions of two piezoelectric patches, the defects' dissimilar equivalent inertia and stiffness contribute to individually manipulating defect bands that correspond to each defect. Hence, with adequately designed piezoelectric patches that consider both the piezoelectric effects on shift patterns of defect bands and the characteristics for the output electric power obtained from a single-defect case, we can successfully localize and harvest the elastic wave energy transferred in broadband frequencies.
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