Flexural waves focusing through shunted piezoelectric patches. (24th May 2016)

• Record Type: Journal Article
• Authors: Yi, K; Collet, M; Ichchou, M; Li, L
• Is Part Of: Smart materials and structures. Volume 25:Number 7(2016:Jul.)
• Publication Date: 2016-05-24
• Subjects: wave focusing -- piezoelectric patch -- negative capacitance -- homogenization -- finite element modeling -- power flow; Smart materials -- Periodicals; Strucural design -- Periodicals; 620.11
• DOI: 10.1088/0964-1726/25/7/075007
• Languages: English
• ISSNs: 0964-1726

Abstract

Abstract: In this paper, we designed and analyzed a piezo-lens to focus flexural waves in thin plates. The piezo-lens is comprised of a host plate and piezoelectric arrays bonded on the surfaces of the plate. The piezoelectric patches are shunted with negative capacitance circuits. The effective refractive indexes inside the piezo-lens are designed to fit a hyperbolic secant distribution by tuning the negative capacitance values. A homogenized model of a piezo-mechanical system is adopted in the designing process of the piezo-lens. The wave focusing effect is studied by the finite element method. Numerical results show that the piezo-lens can focus flexural waves by bending their trajectories, and is effective in a large frequency band. The piezo-lens has the ability to focus flexural waves at different locations by tuning the shunting negative capacitance values. The piezo-lens is shown to be effective for flexural waves generated by different types of sources.