Extensive efforts are being exerted to develop various types of acoustic metamaterials to effectively control the flow of acoustical energy through these materials. However, all these efforts are focused on passive metamaterials with fixed material properties. In this paper, the emphasis is placed on the development of a class of one-dimensional acoustic metamaterials with tunable effective densities in an attempt to enable the adaptation to varying external environment. More importantly, the active metamaterials can be tailored to have increasing or decreasing variation of the material properties along and across the material volume. With such unique capabilities, physically realizable acoustic cloaks can be achieved and objects treated with these active metamaterials can become acoustically invisible. The theoretical analysis of this class of active acoustic metamaterials is presented and the theoretical predictions are determined for an array of fluid cavities separated by piezoelectric boundaries. These boundaries control the stiffness of the individual cavity and in turn its dynamical density. Various control strategies are considered to achieve different spectral and spatial control of the density of this class of acoustic metamaterials. A natural extension of this work is to include active control capabilities to tailor the bulk modulus distribution of the metamaterial in order to build practical configurations of acoustic cloaks.
Skip Nav Destination
e-mail: baz@umd.edu
Article navigation
August 2010
Research Papers
An Active Acoustic Metamaterial With Tunable Effective Density
Amr M. Baz
Amr M. Baz
Department of Mechanical Engineering,
e-mail: baz@umd.edu
University of Maryland
, 2137 Engineering Building, College Park, MD 20742
Search for other works by this author on:
Amr M. Baz
Department of Mechanical Engineering,
University of Maryland
, 2137 Engineering Building, College Park, MD 20742e-mail: baz@umd.edu
J. Vib. Acoust. Aug 2010, 132(4): 041011 (9 pages)
Published Online: June 1, 2010
Article history
Received:
July 21, 2009
Revised:
December 10, 2009
Online:
June 1, 2010
Published:
June 1, 2010
Citation
Baz, A. M. (June 1, 2010). "An Active Acoustic Metamaterial With Tunable Effective Density." ASME. J. Vib. Acoust. August 2010; 132(4): 041011. https://doi.org/10.1115/1.4000983
Download citation file:
Get Email Alerts
Comprehensive Analysis of Input Shaping Techniques for a Chain Suspended From an Overhead Crane
J. Vib. Acoust (August 2024)
Related Articles
Experimental Verification of Pulse Shaping in Elastic Metamaterials Under Impact Excitation
J. Vib. Acoust (April,2023)
A Metamaterial Acoustic Concentrator With Regular Polygonal Cross Section
J. Vib. Acoust (December,2011)
Implications of Nonsub-Wavelength Resonator Spacing on the Sound Transmission Loss Predictions of Locally Resonant Metamaterial Partitions
J. Vib. Acoust (August,2021)
Introduction of Local Resonators to a Nonlinear Metamaterial With Topological Features
J. Comput. Nonlinear Dynam (July,2024)
Related Proceedings Papers
Related Chapters
An Introduction to Yasuura’s Method of Modal Expansion for Solving the Problem of Diffraction by a Periodic Structure Simulating a Metamaterial
International Conference on Control Engineering and Mechanical Design (CEMD 2017)
Patch Antenna on Metamaterial Substrate
International Conference on Computer and Automation Engineering, 4th (ICCAE 2012)
Design and Application of Prestress Drill-Grouted Diaphragm Wall in the Foundation Pit Bracing
Geological Engineering: Proceedings of the 1 st International Conference (ICGE 2007)