Nonlinear phononic crystals based on chains of disks alternating with toroidal structures
Abstract
We study experimentally the acoustic response of a load-bearing, phononic crystal composed of alternating steel disks, and polytetrafluoroethylene o-rings under precompression. The crystal allows for axial, rocking, and shear-polarized wavemodes when excited by a broad-band signal applied off-axis. Finite element analysis is employed to determine the system’s wave modes. The nonlinear interaction between disks and o-rings supports a dynamic response that is tunable with variations in static precompression, leading to controllable frequency shifts in a large band gap. A modal analysis reveals that four of the six principal wave modes are susceptible to external precompression while two modes are not.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 18, 2011
- Source ID
- 10.1063/1.3567753
Entities
People
- A. Spadoni
- C. Daraio
- Marilyn A. Brown
- W. Hurst
Organizations
- Army Research Office
- California Institute of Technology
- National Science Foundation
- Northrop Grumman