Predeformation simultaneously changes the effective material stiffness as well as the geometric configuration and therefore may be utilized to tune wave propagation in soft phononic crystals (PCs). Moreover, the band gaps of soft PCs, as compared with those of the hard ones, are more sensitive to the external mechanical stimuli. A one-dimensional tunable soft acoustic diode based on soft functionally graded (FG) PCs is proposed. The two-way asymmetric propagation behavior is studied at the resonant frequency within the band gap. Numerical results show that the operating frequency (i.e., the resonant peak) of the soft graded acoustic diode can be altered by adjusting the mechanical biasing fields (including the longitudinal prestress and the lateral equibiaxial tension). The adjustment becomes significant when the strain-stiffening effect of the Gent hyperelastic material is properly harnessed. Furthermore, the prestress or equibiaxial tension can affect the two-way filtering of the soft FG PC in a separate and different manner. In addition, it is much easier to realize the tunable acoustic diode by exploiting soft FG materials with stronger compressibility. It is shown that the introduction of acoustic impedance is beneficial for predicting the tunable effects. The simulations and conclusions should provide a solid guidance for the design of tunable two-way unidirectional acoustic diodes made from soft hyperelastic materials.
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March 2019
Research-Article
Tunable Two-Way Unidirectional Acoustic Diodes: Design and Simulation
Yingjie Chen,
Yingjie Chen
Key Laboratory of Soft Machines and Smart
Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Department of Engineering Mechanics,
Zhejiang University,
Hangzhou, 310027, China
Zhejiang University,
Hangzhou, 310027, China
Search for other works by this author on:
Bin Wu,
Bin Wu
Department of Mechanical and
Aerospace Engineering,
Politecnico di Torino,
Torino, 10129, Italy
Aerospace Engineering,
Politecnico di Torino,
Torino, 10129, Italy
Search for other works by this author on:
Yipin Su,
Yipin Su
Key Laboratory of Soft Machines and
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Department of Engineering Mechanics,
Zhejiang University,
Hangzhou, 310027, China;
Zhejiang University,
Hangzhou, 310027, China;
School of Mathematics,
Statistics and Applied Mathematics,
NUI Galway,
University Road,
Galway, H91 TK33, Ireland
Statistics and Applied Mathematics,
NUI Galway,
University Road,
Galway, H91 TK33, Ireland
Search for other works by this author on:
Weiqiu Chen
Weiqiu Chen
Key Laboratory of Soft Machines and
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
State Key Lab of CAD and CG,
Zhejiang University,
Hangzhou, 310058, China;
Zhejiang University,
Hangzhou, 310058, China;
Department of Engineering Mechanics,
Zhejiang University,
Hangzhou, 310027, China;
Zhejiang University,
Hangzhou, 310027, China;
Search for other works by this author on:
Yingjie Chen
Key Laboratory of Soft Machines and Smart
Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Department of Engineering Mechanics,
Zhejiang University,
Hangzhou, 310027, China
Zhejiang University,
Hangzhou, 310027, China
Bin Wu
Department of Mechanical and
Aerospace Engineering,
Politecnico di Torino,
Torino, 10129, Italy
Aerospace Engineering,
Politecnico di Torino,
Torino, 10129, Italy
Yipin Su
Key Laboratory of Soft Machines and
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Department of Engineering Mechanics,
Zhejiang University,
Hangzhou, 310027, China;
Zhejiang University,
Hangzhou, 310027, China;
School of Mathematics,
Statistics and Applied Mathematics,
NUI Galway,
University Road,
Galway, H91 TK33, Ireland
Statistics and Applied Mathematics,
NUI Galway,
University Road,
Galway, H91 TK33, Ireland
Weiqiu Chen
Key Laboratory of Soft Machines and
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
Smart Devices of Zhejiang Province,
Zhejiang University,
Hangzhou, 310027, China;
State Key Lab of CAD and CG,
Zhejiang University,
Hangzhou, 310058, China;
Zhejiang University,
Hangzhou, 310058, China;
Department of Engineering Mechanics,
Zhejiang University,
Hangzhou, 310027, China;
Zhejiang University,
Hangzhou, 310027, China;
1Corresponding author.
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received November 12, 2018; final manuscript received December 16, 2018; published online January 8, 2019. Editor: Yonggang Huang.
J. Appl. Mech. Mar 2019, 86(3): 031010 (9 pages)
Published Online: January 8, 2019
Article history
Received:
November 12, 2018
Revised:
December 16, 2018
Citation
Chen, Y., Wu, B., Su, Y., and Chen, W. (January 8, 2019). "Tunable Two-Way Unidirectional Acoustic Diodes: Design and Simulation." ASME. J. Appl. Mech. March 2019; 86(3): 031010. https://doi.org/10.1115/1.4042321
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