Applied Mathematics and Mechanics (English Edition) ›› 2017, Vol. 38 ›› Issue (3): 411-422.doi: https://doi.org/10.1007/s10483-017-2171-7

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Folding beam-type piezoelectric phononic crystal with low-frequency and broad band gap

Shan JIANG1,2, Longxiang DAI1,2, Hao CHEN1,2, Hongping HU1,2, Wei JIANG3, Xuedong CHEN3   

  1. 1. Department of Mechanics, Huazhong University of Science and Technology, Wuhan 430074, China;
    2. Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment, Huazhong University of Science and Technology, Wuhan 430074, China;
    3. State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2016-03-23 Revised:2016-08-07 Online:2017-03-01 Published:2017-03-01
  • Contact: Hongping HU E-mail:huhp@hust.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Nos.11272126, 51435006, and 51121002) and the Fundamental Research Funds for the Central Universities (Nos. HUST:2016JCTD114 and HUST:2015TS121)

Abstract:

A folding beam-type piezoelectric phononic crystal model is proposed to isolate vibration. Two piezoelectric bimorphs are joined by two masses as a folding structure to comprise each unit cell of the piezoelectric phononic crystal. Each bimorph is connected independently by a resistive-inductive resonant shunting circuit. The folding structure extends the propagation path of elastic waves, while its structure size remains quite small. Propagation of coupled extension-flexural elastic waves is studied by the classical laminated beam theory and transfer matrix method. The theoretical model is further verified with the finite element method (FEM). The effects of geometrical and circuit parameters on the band gaps are analyzed. With only 4 unit cells, the folding beam-type piezoelectric phononic crystal generates two Bragg band gaps of 369 Hz to 1 687 Hz and 2 127 Hz to 4 000 Hz. In addition, between these two Bragg band gaps, a locally resonant band gap is induced by resonant shunting circuits. Appropriate circuit parameters are used to join these two Bragg band gaps by the locally resonant band gap. Thus, a low-frequency and broad band gap of 369 Hz to 4 000 Hz is obtained.

Key words: Accretive mapping, probabilistic normed space, pseudo-contractive mapping, phononic crystal, band gap, folding beam-type structure, wave propagation, piezoelectric

2010 MSC Number: 

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