Torsional balance of seismically isolated asymmetric structures

2013 ◽  
Vol 46 ◽  
pp. 703-717 ◽  
Author(s):  
Carlos E. Seguin ◽  
Jose L. Almazán ◽  
Juan C. De la Llera
Keyword(s):  
Asymmetric Structures ◽  
Seismically Isolated ◽  
Torsional Balance

Torsional balance of plan asymmetric structures with viscoelastic dampers

2007 ◽  
Vol 29 (6) ◽  
pp. 914-932 ◽  
Author(s):  
Marcos García ◽  
Juan C. de la Llera ◽  
José L. Almazán
Keyword(s):  
Viscoelastic Dampers ◽  
Asymmetric Structures ◽  
Torsional Balance

Torsional balance of asymmetric structures by means of tuned mass dampers

2012 ◽  
Vol 42 ◽  
pp. 308-328 ◽  
Author(s):  
José Luis Almazán ◽  
Gilda Espinoza ◽  
Juan Jesús Aguirre
Keyword(s):  
Tuned Mass Dampers ◽  
Asymmetric Structures ◽  
Torsional Balance

Torsional balance of plan-asymmetric structures with frictional dampers: analytical results

2005 ◽  
Vol 34 (9) ◽  
pp. 1089-1108 ◽  
Author(s):  
Juan C. de la Llera ◽  
José L. Almazán ◽  
Ignacio J. Vial
Keyword(s):  
Asymmetric Structures ◽  
Analytical Results ◽  
Torsional Balance

Torsional balance of plan-asymmetric structures with frictional dampers: experimental results

2006 ◽  
Vol 35 (15) ◽  
pp. 1875-1898 ◽  
Author(s):  
Ignacio J. Vial ◽  
Juan C. de la Llera ◽  
José L. Almazán ◽  
Víctor Ceballos
Keyword(s):  
Experimental Results ◽  
Asymmetric Structures ◽  
Torsional Balance

scholarly journals Odd Willis coupling induced by broken time-reversal symmetry

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Li Quan ◽  
Simon Yves ◽  
Yugui Peng ◽  
Hussein Esfahlani ◽  
Andrea Alù
Keyword(s):  
Time Reversal ◽  
Time Reversal Symmetry ◽  
Acoustic Metamaterials ◽  
Asymmetric Structures ◽  
Sound Control ◽  
Wavefront Shaping ◽  
Scattering Response ◽  
Symmetric Structures ◽  
Signal Routing ◽  
Broad Interest

AbstractWhen sound interacts with geometrically asymmetric structures, it experiences coupling between pressure and particle velocity, known as Willis coupling. While in most instances this phenomenon is perturbative in nature, tailored asymmetries combined with resonances can largely enhance it, enabling exotic acoustic phenomena. In these systems, Willis coupling obeys reciprocity, imposing an even symmetry of the Willis coefficients with respect to time reversal and the impinging wave vector, which translates into stringent constraints on the overall scattering response. In this work, we introduce and experimentally observe a dual form of acoustic Willis coupling, arising in geometrically symmetric structures when time-reversal symmetry is broken, for which the pressure-velocity coupling is purely odd-symmetric. We derive the conditions to maximize this effect, we experimentally verify it in a symmetric subwavelength scatterer biased by angular momentum, and we demonstrate the opportunities for sound scattering enabled by odd Willis coupling. Our study opens directions for acoustic metamaterials, with direct implications for sound control, non-reciprocal scattering, wavefront shaping and signal routing, of broad interest also for nano-optics, photonics, elasto-dynamics, and mechanics.

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