Global Patent Index - EP 3850615 A4

EP 3850615 A4 20220615 - 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

EP 3850615 A4 20220615 (EN)

Application

EP 19859064 A 20190913

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 11/165 (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)

Citation (search report)

  • [XYI] WO 2017075187 A2 20170504 - MASSACHUSETTS INST TECHNOLOGY [US]
  • [XAI] US 9324312 B2 20160426 - BERKER ALI [US], et al
  • [A] US 2018024265 A1 20180125 - SWETT DWIGHT W [US]
  • [XAI] Y. CHENG ET AL: "Ultra-sparse metasurface for high reflection of low-frequency sound based on artificial Mie resonances", NATURE MATERIALS, vol. 14, no. 10, 31 August 2015 (2015-08-31), London, pages 1013 - 1019, XP055288152, ISSN: 1476-1122, DOI: 10.1038/nmat4393
  • [Y] SHEN CHEN ET AL: "Broadband Acoustic Hyperbolic Metamaterial", PHYSICAL REVIEW LETTERS, vol. 115, no. 25, 1 December 2015 (2015-12-01), US, XP055911328, ISSN: 0031-9007, Retrieved from the Internet <URL:http://link.aps.org/article/10.1103/PhysRevLett.115.254301> [retrieved on 20220411], DOI: 10.1103/PhysRevLett.115.254301
  • [T] GAO NANSHA ET AL: "Acoustic Metamaterials for Noise Reduction: A Review", ADVANCED MATERIALS TECHNOLOGIES, 29 January 2022 (2022-01-29), DE, pages 2100698, XP055910463, ISSN: 2365-709X, Retrieved from the Internet <URL:https://onlinelibrary.wiley.com/doi/full-xml/10.1002/admt.202100698> [retrieved on 20220411], DOI: 10.1002/admt.202100698
  • See references of WO 2020056337A1

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

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