EP 3850615 A1 20210721 - STEALTH APPLICATIONS OF ACOUSTIC HYPERABSORPTION BY ACOUSTICALLY DARK METAMATERIAL CELLS
Title (en)
STEALTH APPLICATIONS OF ACOUSTIC HYPERABSORPTION BY ACOUSTICALLY DARK METAMATERIAL CELLS
Title (de)
VERBORGENE ANWENDUNGEN DER AKUSTISCHEN HYPERABSORPTION DURCH AKUSTISCH DUNKLE METAMATERIALZELLEN
Title (fr)
APPLICATIONS FURTIVES D'HYPERABSORPTION ACOUSTIQUE PAR DES CELLULES EN MÉTAMATÉRIAU ACOUSTIQUEMENT SOMBRES
Publication
Application
Priority
- US 201816132402 A 20180915
- US 2019051127 W 20190913
Abstract (en)
[origin: WO2020056337A1] Aspects of the present disclosure include apparatus, systems, and methods for enhancing passive stealth capabilities. Apparatus may include at least one acoustic attenuator comprising a metamaterial matrix having a plurality of cells and configured, upon at least a partial immersion in a fluid, to form an acoustic attenuation system including at least a portion of the matrix and the fluid, the acoustic attenuation system configured to acoustically attenuate acoustic signals incident on the attenuator from the fluid. At least one cell of the plurality of cells may comprise a plurality of sub-cells azimuthally arrayed about an axis of alignment, with at least one sub-cell of the plurality comprising a plurality of solid cell segments substantially oriented in alignment with a mapping geometry comprising an inversion of a canonical tangent circles mapping.
IPC 8 full level
G10K 11/16 (2006.01); G10K 11/162 (2006.01); G10K 11/172 (2006.01); G10K 11/30 (2006.01); G10K 11/36 (2006.01)
CPC (source: EP)
G10K 11/165 (2013.01); G10K 11/172 (2013.01)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2020056337 A1 20200319; EP 3850615 A1 20210721; EP 3850615 A4 20220615
DOCDB simple family (application)
US 2019051127 W 20190913; EP 19859064 A 20190913