Optimal shunt parameters for maximising wave attenuation with periodic piezoelectric patches

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Title: Optimal shunt parameters for maximising wave attenuation with periodic piezoelectric patches
Authors: Junyi, L
Balint, DS
Item Type: Journal Article
Abstract: Elastic metamaterials, which have huge potential in wave guiding and attenuation applications, can be built from structures with periodic piezoelectric patch arrays. Passive shunts offer the benefits of simplicity and low cost. In this paper, the effects of the magnitude and phase angle of the shunt impedance on the attenuation constant of a beam with periodic piezoelectric patch arrays were studied in order to determine the optimal shunt that produces the widest and most effective band gaps. The attenuation constants were found to be large when the phase angle is Formula rad and when the magnitude decreases exponentially with the excitation frequency. This corresponds to a negative capacitance circuit, which is the optimal shunt for such systems. The attenuation constant of the system reduces significantly when the impedance deviates from the optimal value suggesting other circuits are less effective. The impedance and band structure of resistive–inductive (R-L), negative capacitance and resistive shunts were investigated. As expected, the negative capacitance circuit produces a large band gap, while the R-L circuit only produces a band gap around its natural frequency. The transmissibilities of a finite system with these circuits demonstrated that vibration transmissions are low within the band gaps. Furthermore, the stability of the negative capacitance circuit built using a dual-output second-generation current conveyor (DO-CCII) was examined by studying the pole diagrams. The system was found to be stable in ideal conditions but unstable when parasitic effects are considered. This suggests that the stability of the system is an important consideration for the implementation of this strategy and the different negative impedance converter designs available in the literature should be studied to find a suitable circuit configuration.
Issue Date: 10-May-2016
Date of Acceptance: 6-Apr-2016
URI: http://hdl.handle.net/10044/1/39605
DOI: https://dx.doi.org/10.1177/1045389X16645861
ISSN: 1045-389X
Publisher: SAGE
Start Page: 108
End Page: 123
Journal / Book Title: Journal of Intelligent Material Systems and Structures
Volume: 28
Issue: 1
Copyright Statement: © The Author(s) 2016, published by Sage Publications. The final publication is available via Sage at http://dx.doi.org/10.1177/1045389X16645861
Keywords: Materials
09 Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Mechanical Engineering
Faculty of Natural Sciences

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