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    ACOUSTIC METAMATERIAL-BASED MUFFLER FOR EXHAUST NOISE REDUCTION
    1.
    发明公开
    ACOUSTIC METAMATERIAL-BASED MUFFLER FOR EXHAUST NOISE REDUCTION 审中-公开

    公开(公告)号：US20240167403A1

    公开(公告)日：2024-05-23

    申请号：US18517295

    申请日：2023-11-22

    申请人： AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION ,  THE CENTER FOR ADVANCED META-MATERIALS

    发明人： Jin Woo LEE ,  Gyeong Ju LEE

    IPC分类号： F01N1/24

    CPC分类号： F01N1/24

    摘要： The present disclosure provides an acoustic metamaterial-based muffler for exhaust noise reduction, including an exhaust flow body that is provided with an inlet through which exhaust gas of an internal combustion engine flows in on one side, and an outlet through which the exhaust gas flows out on the other side, and a flow passage for guiding a movement of the exhaust gas therein; and a plurality of noise reduction units that are sequentially disposed along a discharge direction of the exhaust gas inside the exhaust flow body to reduce noise in a specific frequency band in exhaust noise of the exhaust gas caused by the movement of the exhaust gas on the inside of the exhaust flow body.

    META-MUFFLER FOR REDUCING BROADBAND NOISE
    4.
    发明公开
    META-MUFFLER FOR REDUCING BROADBAND NOISE 审中-公开

    公开(公告)号：US20230184147A1

    公开(公告)日：2023-06-15

    申请号：US18105899

    申请日：2023-02-06

    申请人： CENTER FOR ADVANCED META-MATERIALS ,  AJOU UNIVERSITY INDUSTRY-ACADEMIC COOPERATION FOUNDATION

    发明人： Byung Hun AN ,  Jin Woo LEE ,  Hak Joo LEE

    IPC分类号： F01N1/02

    CPC分类号： F01N1/023 ,  F01N2490/155 ,  F01N2490/08

    摘要： Disclosed herein is a meta-muffler for reducing broadband noise. The meta-muffler includes: a flow pipe through which a fluid flows; an outer barrel disposed outside the flow pipe to be spaced apart from the flow pipe; and multiple metastructures arranged in a flow direction of the fluid and each comprising an opening opened parallel to the flow direction of the fluid, a resonance chamber disposed between the flow pipe and the outer barrel and communicating with the flow pipe through the opening, and a neck adjustment member extending from the outer barrel toward the flow pipe to be spaced apart from the opening in the flow direction of the fluid. The meta-muffler can increase transmission loss of noise flowing through the flow pipe through maximization of energy loss of sound waves entering the resonance chamber of the metastructure and can effectively attenuate noise over a wide band ranging from low frequencies to high frequencies.

    TRANSPARENT STEALTH STRUCTURE
    5.
    发明申请
    TRANSPARENT STEALTH STRUCTURE 有权

    公开(公告)号：US20220352643A1

    公开(公告)日：2022-11-03

    申请号：US17621225

    申请日：2019-07-23

    申请人： CENTER FOR ADVANCED META-MATERIALS

    发明人： Yong June KIM ,  Hyun June JUNG ,  Se Jeong WON ,  Hak Joo LEE

    IPC分类号： H01Q17/00

    摘要： A transparent stealth structure includes: a first transparent film structure stacked on a front surface of a transparent base, the first transparent film structure causing energy loss of incident electromagnetic waves having a target frequency to change a phase of transmitted electromagnetic waves propagating toward the transparent base; and a second transparent film structure stacked on a back surface of a transparent base, the second transparent film structure reflecting the transmitted electromagnetic waves having passed through the transparent base while adjusting a phase of reflected waves propagating toward the first transparent film structure, wherein the first transparent film structure includes a first front transparent conductive pattern having a first sheet resistance and a second front transparent conductive pattern filling a region, and the second transparent film structure includes a first rear transparent conductive pattern having a third sheet resistance and a second rear transparent conductive pattern filling a region.

    FLUID SILENCER
    6.
    发明申请
    FLUID SILENCER 有权

    公开(公告)号：US20220349509A1

    公开(公告)日：2022-11-03

    申请号：US17621222

    申请日：2020-06-09

    申请人： CENTER FOR ADVANCED META-MATERIALS

    发明人： Jong Jin PARK ,  Jun Hyuk KWAK ,  Hak Joo LEE ,  Tae In CHOI ,  Min Seok JUNG

    IPC分类号： F16L55/033

    摘要： A fluid silencer includes: an expansion pipe disposed on a pipe through which a fluid containing noise sources flows and having an accommodation space therein; a viscous fluid received in the accommodation space; a noise introducing member disposed between the pipe and the expansion pipe to seal the accommodation space and allowing the noise sources to be introduced into the accommodation space therethrough; at least one partition member disposed in the accommodation space and dividing the accommodation space in a flow direction of the fluid; multiple baffle members disposed on one surface of the partition member and forming multiple sound absorbing spaces into which the noise sources introduced into the accommodation space are dispersedly introduced; and an elastic member disposed between the partition member and the baffle members and contracted/expanded by the viscous fluid entering/leaving the sound absorbing spaces as the noise sources are introduced into the sound absorbing spaces.

    Optical imaging apparatus using metamaterial and optical imaging method using metamaterial
    8.
    发明授权
    Optical imaging apparatus using metamaterial and optical imaging method using metamaterial 有权

    公开(公告)号：US11175186B2

    公开(公告)日：2021-11-16

    申请号：US16809275

    申请日：2020-03-04

    申请人： KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY ,  Center for Advanced Meta-Materials

    发明人： Minah Seo ,  Sang-Hun Lee ,  Chulki Kim ,  Jae Hun Kim ,  Taikjin Lee ,  Deok Ha Woo

    IPC分类号： G01J5/08 ,  G02B1/00 ,  G01J5/00

    摘要： One embodiment of the present invention provides an optical imaging apparatus using a metamaterial including a metamaterial array sensor which includes a plurality of unit cells made of a metamaterial and is positioned adjacent to an observation object, an imaging beam providing unit which provides an imaging beam toward the metamaterial array sensor, a control beam providing unit which controls a control beam provided to the unit cell to block the imaging beam incident on the unit cell, and an imaging beam measuring unit which measures a unit cell imaging beam transmission amount passing through the unit cell by measuring an imaging beam transmission amount of the metamaterial array sensor when the imaging beam passes through the unit cell and an imaging beam transmission amount of the metamaterial array sensor when the control beam is focused on the unit cell to block the imaging beam incident on the unit cell.