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阵列式压电俘能拓宽频带的研究

Release Time:2019-03-10  Hits:

Indexed by: Journal Article

Date of Publication: 2016-10-15

Journal: 压电与声光

Included Journals: Scopus、CSCD、ISTIC、PKU

Volume: 38

Issue: 5

Page Number: 695-703

ISSN: 1004-2474

Key Words: 压电俘能;阵列;输出功率;谐振频率;频带;半功率点

Abstract: 压电俘能器只有在谐振频率附近较窄的频率范围才可获得最佳的功率输出.多个压电俘能器采用阵列连接可实现频率拓宽.该文定义了组成阵列的悬臂梁谐振频率之差△fr(即| f1-f2|)与单个梁带宽BW(即半功率点对应的带宽)之比,即△fr/BW,以其大小来探究阵列悬臂梁的频率差在什么范围内能拓宽阵列频带BWa.并对串、并联阵列进行了理论和实验研究,结果表明,悬臂梁的谐振频率差在一定范围内时,阵列连接既可提高输出功率也可拓宽频带.悬臂梁在该文设计的尺寸和材料内,单个梁的带宽为3.5 Hz时,对于3个梁的并联阵列,△fr/BW<0.657;而串联阵列,△fr/BW<2.571.

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