Affiliation:
1. College of Mechanical Engineering, Beijing University of Technology, Beijing 100124, China
Abstract
Abstract
Phononic crystals composed of delicately designed periodic units are used to control spatial and spectral properties of acoustic or elastic waves. The ability to manipulate transmitting waves in a real-time dynamic manner provides a new concept in programable phononic crystals and metamaterials. In this study, the mechanical waves and bandgaps in a two-dimensional spring-mass array loaded by high-frequency parametric excitation have been investigated by both analytical and numerical methods. It is found that the high-frequency parametric excitation provides an equivalent additional stiffness which leads to low-frequency bandgaps. By tuning the parametric excitation, the versatility of such a dynamic modulating technique has been presented. The waveguide structure has also been designed and studied by non-uniformly distributed parametric excitations.
Funder
Beijing Natural Science Foundation
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
8 articles.
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