Title:
ANISOTROPIC MEDIUM FOR MODE CONVERSION OF ELASTIC WAVE, SHEAR ULTRASONIC TRANSDUCER USING SAME, AND SOUND INSULATING PANEL USING SAME
Document Type and Number:
WIPO Patent Application WO/2018/174339
Kind Code:
A1
Abstract:
Provided is an anisotropic medium for mode conversion of an elastic wave. The anisotropic medium is disposed between external isotropic media and, as an anisotropic layer, causes a multimodal transmission phenomenon with respect to an incident elastic wave of a specific mode. The anisotropic medium has a non-zero mode-coupling stiffness constant, and the stiffness constant and excitation frequency-dependent thickness of the anisotropic layer satisfies the following equation (2), which is a same direction phase-matching condition, or the following equation (3), which is an opposite direction phase-matching condition. Thus, mode conversion Fabry-Perot resonance is generated.
Equation (2): △φ≡kqld-kqsd=(2n+1)π, (kql: wave number of the anisotropic medium in a quasi-longitudinal mode, kqs: wave number of the anisotropic medium in a quasi-shear mode, d: thickness of the anisotropic medium, n: arbitrary integer)
Equation (3): ∑φ≡kqld+kqsd=(2m+1)π, (m: arbitrary integer)
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Inventors:
KIM YOON-YOUNG (KR)
YANG XIONGWEI (KR)
KWEUN MIN-WOO (KR)
LEE HYUNG-JIN (KR)
YANG XIONGWEI (KR)
KWEUN MIN-WOO (KR)
LEE HYUNG-JIN (KR)
Application Number:
PCT/KR2017/006518
Publication Date:
September 27, 2018
Filing Date:
June 21, 2017
Export Citation:
Assignee:
SEOUL NAT UNIV R&DB FOUNDATION (KR)
International Classes:
B32B7/02; G10K11/16
Foreign References:
| JPH05256828A | 1993-10-08 |
Other References:
KWEUN, MIN WOO ET AL.: "Phenomenon of Elastic Wave Mode Conversion in Anisotropic Media", THE KOREAN SOCIETY OF MECHANICAL ENGINEERS AUTUMN CONFERENCE, November 2015 (2015-11-01), pages 1534 - 1535
KIM, YOUNG HWAN ET AL.: "Simulation of Elastic Wave Propagation in Anisotropic Materials", JOURNAL OF THE KOREAN SOCIETY FOR NONDESTRUCTIVE TESTING, vol. 17, no. 4, December 1997 (1997-12-01), pages 227 - 236, XP055548193
NAYFEH, A. H. ET AL.: "Elastic Wave Reflection from Liquid-anisotropic Substrate Interfaces", WAVE MOTION, vol. 14, 1991, pages 55 - 67, XP025616768
MA, P. S. ET AL.: "Dispersion Suppression of Guided Elastic Waves by Anisotropic Metamaterial", THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, vol. 138, no. 1, 2015, pages 1 - 6
KWEUN, J. M. ET AL.: "Transmodal Fabry-Perot Resonance: Theory and Realization with Elastic Metamaterials", PHYSICAL REVIEW LETTERS, vol. 118, XP055548200
KIM, YOUNG HWAN ET AL.: "Simulation of Elastic Wave Propagation in Anisotropic Materials", JOURNAL OF THE KOREAN SOCIETY FOR NONDESTRUCTIVE TESTING, vol. 17, no. 4, December 1997 (1997-12-01), pages 227 - 236, XP055548193
NAYFEH, A. H. ET AL.: "Elastic Wave Reflection from Liquid-anisotropic Substrate Interfaces", WAVE MOTION, vol. 14, 1991, pages 55 - 67, XP025616768
MA, P. S. ET AL.: "Dispersion Suppression of Guided Elastic Waves by Anisotropic Metamaterial", THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, vol. 138, no. 1, 2015, pages 1 - 6
KWEUN, J. M. ET AL.: "Transmodal Fabry-Perot Resonance: Theory and Realization with Elastic Metamaterials", PHYSICAL REVIEW LETTERS, vol. 118, XP055548200
Attorney, Agent or Firm:
KIM, Min-tae (KR)
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