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公开(公告)号：US11965442B2
公开(公告)日：2024-04-23
申请号：US17829969
申请日：2022-06-01
发明人： Taehwa Lee , Xiaopeng Li , Ziqi Yu
IPC分类号： F01N1/02 , G10K11/16 , G10K11/172
CPC分类号： F01N1/023 , G10K11/161 , G10K11/172
摘要： A duct includes a duct body defining an inlet, an outlet, and a channel connecting the inlet and the outlet. The duct body also defines an upstream resonator. The upstream resonator includes an upstream annular cavity external to the channel and an annular perforated plate coplanar with the upstream annular cavity. The duct body further defines a downstream resonator. The downstream resonator includes a downstream annular cavity external to the channel and an annular neck coplanar with the downstream annular cavity.
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公开(公告)号：US20240038210A1
公开(公告)日：2024-02-01
申请号：US17875586
申请日：2022-07-28
发明人： Xiaopeng Li , Ziqi Yu , Taehwa Lee
IPC分类号： G10K11/168 , F16F15/02
CPC分类号： G10K11/168 , F16F15/02 , F16F2228/007
摘要： A flexural wave absorber includes an L-shaped cantilever beam lossy acoustic black hole disposed on a surface of a mechanical structure and an L-shaped cantilever beam lossless acoustic black hole disposed on the surface and spaced apart from the L-shaped cantilever beam lossy acoustic black hole a predefined distance. The L-shaped cantilever beam lossy acoustic black hole and the L-shaped cantilever beam lossless acoustic black hole, in combination, are configured to asymmetrically absorb a plurality of different frequencies of flexural waves within at least a 2000 Hz frequency band acting on the mechanical structure. The L-shaped cantilever beam lossy acoustic black hole and the L-shaped cantilever beam lossless acoustic black hole can both include a projecting beam with an outer surface or an inner surface having power law profile.
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公开(公告)号：US20230419939A1
公开(公告)日：2023-12-28
申请号：US17848757
申请日：2022-06-24
发明人： Xiaopeng Li , Ziqi Yu , Taehwa Lee
IPC分类号： G10K11/172 , G10K11/162
CPC分类号： G10K11/172 , G10K11/162
摘要： A flexural wave absorber includes a metasurface with an inner portion, an outer portion, and a plurality of beam strips extending between the inner portion and the outer portion. The metasurface also includes a plurality of coupled resonators disposed on the plurality of beam strips. The plurality of coupled resonators can include a lossy resonator and a lossless resonator, two lossy resonators and a lossless resonator, or a lossy resonator and two lossless resonators. In addition, each of the plurality of beam strips can have multiple pairs of coupled resonators disposed thereon that work at or absorb different frequency ranges.
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24.发明授权公开(公告)号：US11781614B2
公开(公告)日：2023-10-10
申请号：US17397084
申请日：2021-08-09
发明人： Xiaopeng Li , Ziqi Yu , Taehwa Lee
摘要： Described is a system for transmitting a flexural wave acting on one structure to another structure. In one example, a system includes a first structure having a first property and a first end and a second structure having a second property and a second end connected to the first end of the first structure. The first property is different from the second property and may be related to the material and/or geometric properties of the first and second structures. A mechanical resonator is connected to the first structure at a distance from the first end of about a quarter-wavelength of the frequency of a flexural wave acting on the first structure. The mechanical resonator matches a first mechanical impedance of the first structure to a second mechanical impedance of the second structure to allow high transmission of the flexural wave acting on the first structure to the second structure.
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25.发明申请公开(公告)号：US20230042380A1
公开(公告)日：2023-02-09
申请号：US17397084
申请日：2021-08-09
发明人： Xiaopeng Li , Ziqi Yu , Taehwa Lee
摘要： Described is a system for transmitting a flexural wave acting on one structure to another structure. In one example, a system includes a first structure having a first property and a first end and a second structure having a second property and a second end connected to the first end of the first structure. The first property is different from the second property and may be related to the material and/or geometric properties of the first and second structures. A mechanical resonator is connected to the first structure at a distance from the first end of about a quarter-wavelength of the frequency of a flexural wave acting on the first structure. The mechanical resonator matches a first mechanical impedance of the first structure to a second mechanical impedance of the second structure to allow high transmission of the flexural wave acting on the first structure to the second structure.
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公开(公告)号：US20210285735A1
公开(公告)日：2021-09-16
申请号：US16815819
申请日：2020-03-11
发明人： Ercan M. Dede , Hideo Iizuka , Ziqi Yu
摘要： Embodiments described herein generally relate to a multi-mode heat transfer system. The heat transfer system includes an emitter device. The emitter device includes an inner core surrounded by an outer core having a thickness and an outer surface. A composite material pattern extends through at least a portion of the outer surface and at least a portion of the thickness of the outer core and is thermally coupled to the inner core. The composite material pattern in combination with an optimized emissivity surface coating/paint profile directs a heat from the inner core to an object other than the emitter device.
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27.发明公开公开(公告)号：US20240297618A1
公开(公告)日：2024-09-05
申请号：US18178213
申请日：2023-03-03
发明人： Ercan M. Dede , Ziqi Yu , Taehwa Lee , Shailesh Joshi
CPC分类号： H02S40/425 , H02S10/30
摘要： Thermophotovoltaic (TPV) systems for energy harvesting with thermal management are provided. The systems include a three-dimensional architected wick having a porous structure for delivering a two-phase working fluid via capillary action to maintain efficient cooling of a TPV cell array. The wick is configured to uniformly deliver working fluid for evaporative cooling of the TPV cells. The wick may be in direct thermal communication with the TPV cell or employed to locally deliver working fluid to an evaporator that is in direct thermal communication with the TPV cell. The increased surface area of porous structure of the wick and the evaporator increases heat dissipation and evaporative cooling providing an improvement in temperature distribution and heat transfer critical to maintaining the TPV cell at a constant temperature.
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公开(公告)号：US11924606B2
公开(公告)日：2024-03-05
申请号：US17557934
申请日：2021-12-21
发明人： Ziqi Yu , Xiaopeng Li , Taehwa Lee
IPC分类号： H04R1/40 , G10K11/172 , H04R3/00
CPC分类号： H04R1/406 , G10K11/172 , H04R3/005 , H04S2400/15
摘要： Systems and methods for determining the incident angle of an acoustic wave are presented herein. One embodiment receives an acoustic wave at N transducers, where N is a natural number greater than or equal to 2; solves a set of N coupled differential equations modeling a set of N virtual coupled acoustic resonators using N coupled analog circuits, wherein each of the N coupled analog circuits receives an output signal from a unique one of the N transducers and outputs a voltage signal; and analyzes the N voltage signals output by the N coupled analog circuits to produce an estimate of the incident angle of the acoustic wave.
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公开(公告)号：US20230419938A1
公开(公告)日：2023-12-28
申请号：US17851422
申请日：2022-06-28
发明人： Taehwa Lee , Yuyang Song , Xiaopeng Li , Ziqi Yu
IPC分类号： G10K11/168
CPC分类号： G10K11/168
摘要： A sound absorbing device includes a chamber with an opening and at least one fabric layer extending across the opening. The at least one fabric layer extending across the opening is at least two fabric layers stacked relative to and in direct contact with each other, at least two fabric layers stacked relative to and spaced apart from each other by a predefined distance, at least one elastic fabric layer configured to vibrate independently from the chamber, or a three dimensional fabric layer. The at least two fabric layers stacked relative to and in direct contact with each other and the at least two fabric layers stacked relative to and spaced apart from each other by a predefined distance are configured to move relative to each other, and the at least one elastic fabric layer is configured to vibrate independently from the chamber.
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公开(公告)号：US20230349151A1
公开(公告)日：2023-11-02
申请号：US17731773
申请日：2022-04-28
发明人： Taehwa Lee , Xiaopeng Li , Ziqi Yu
IPC分类号： E04B1/84
CPC分类号： E04B1/8404 , E04B2001/848
摘要： A sound absorber can include a housing including a back wall, a perimeter wall, and an interior wall that form cells having cavities. The sound absorber can also include a panel disposed on the housing that substantially faces the back wall and encloses the cavities of the cells. The panel can define groups of holes for each cell such that one group of holes extend though the panel to the cavity of one cell and another group of holes extend through the panel to the cavity of another cell.
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