Active control on switchable waveguide of elastic wave metamaterials with the 3D printing technology

Guan-Hua Li,Yue-Sheng Wang,Yi-Ze Wang

doi:10.1038/s41598-019-52705-5

Guan-Hua Li, Yue-Sheng Wang + Show 1 more

Open Access

https://doi.org/10.1038/s41598-019-52705-5

Copy DOI

Journal: Scientific Reports	Publication Date: Nov 7, 2019
Citations: 20	License type: open-access

Affiliation: Beijing Jiaotong University, Tianjin University

Abstract

Propagation of elastic waves along a direction has special interests in practical applications. These concerns generate the design of an elastic wave metamaterial with electrically switchable properties, which is studied in this work. The structure contains a T-shaped waveguide in a plate with the 3D printing technology; and the active control system is used to tune the propagation direction of the flexural wave. The piezoelectric patches which are connected by the negative capacitance circuits are applied to behave as the active control system. The finite element simulation is performed to give the theoretical prediction of the switchable waveguide and the tunable equivalent parameters are achieved by the electrical circuits. The active control experiments are finally carried out to support the numerical design.

Highlights

Propagation of elastic waves along a direction has special interests in practical applications
We propose an elastic wave metamaterial with a T-shaped switchable waveguide by the active control system
The active control system is bonded on an elastic wave metamaterial plate which consists of the piezoelectric patches and negative capacitance circuits

Summary

Introduction

Propagation of elastic waves along a direction has special interests in practical applications. Phononic crystals and elastic wave metamaterials which have the periodic characteristics have received lots of attention[1,2,3,4,5,6,7,8] This is mainly because that these periodic systems have superior properties, such as the wave band gaps[9,10,11,12], negative refraction[13,14,15,16], acoustic cloaks[17,18,19], etc. By connecting gradient negative capacitance circuits to an array of piezoelectric patches, Chen et al.[35] designed a metamaterial-based sensing system with the gradient bending stiffness They demonstrated that the proposed system can achieve more than two orders of magnitude amplification of flexural wave signals to overcome the detection limit. The research in this field has attracted extensive attention and has broad development prospects

Methods

Results

Conclusion