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公开(公告)号：US11482203B2
公开(公告)日：2022-10-25
申请号：US16875073
申请日：2020-05-15
发明人： Taehwa Lee , Hideo Iizuka
IPC分类号： E04B1/82 , G10K11/172 , H04R1/20 , G10K11/162
摘要： A broadband sparse acoustic reflector includes a periodic array of laterally spaced apart unit cells, each unit cell having a plurality of longitudinally positioned Helmholtz resonators. Each unit cell includes a Helmholtz resonator having a neck that places the resonator interior in fluid communication with an ambient fluid, in the lateral direction. Each Helmholtz resonator of the unit cell has a different resonance frequency, providing broadband reflection.
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公开(公告)号：US11459921B2
公开(公告)日：2022-10-04
申请号：US16296403
申请日：2019-03-08
发明人： Taehwa Lee , Hideo Iizuka , Ercan Mehmet Dede
摘要： A sound suppression assembly is provided for absorbing acoustic energy from an air circulation device. The assembly includes an air circulation device, such as an axial fan, and a plurality of sparsely-arranged two-sided Helmholtz unit cells disposed in a periodic array. Each unit cell includes a lossy resonator and a lossless resonator. The lossy resonator includes a first chamber portion bounded by at least one first boundary wall defining a first chamber volume, and a first neck forming an opening in the first chamber portion. The lossless resonator includes a second chamber portion bounded by at least one second boundary wall defining a second chamber volume, and a second neck forming an opening in the second chamber portion. The unit cells can be positioned in a circular pattern with the first neck of the lossy resonators directed to a source of acoustic energy from the air circulation device.
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公开(公告)号：US20220291023A1
公开(公告)日：2022-09-15
申请号：US17196054
申请日：2021-03-09
发明人： Xiaopeng Li , Taehwa Lee , Kenichi Yatsugi , Michio Yasunishi , Hiroshi Yoshimoto , Takumi J. Jinmon , Hideo Iizuka
摘要： Embodiments described herein relate to a device for detecting the position of electromagnetic noise. The device includes a detector that includes coils that produce voltages in the presence of electromagnetic noise of a defined frequency. The device further includes a controller that senses the voltages and determines a position of the electromagnetic noise relative to the device according to the voltages.
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公开(公告)号：US20220036871A1
公开(公告)日：2022-02-03
申请号：US16945286
申请日：2020-07-31
发明人： Taehwa Lee , Hideo Iizuka , Ryohei Tsuruta
IPC分类号： G10K11/172
摘要： Systems for building modular quarter-wavelength resonators, and arrays of said resonators, include interlocking blocks having channels in them. Different block varieties can include those having straight channels and those having curved channels, to facilitate assembly of resonators of any desired configuration. Resonator length, and therefore resonance frequency, can be easily designed by adjusting the number of blocks used for a particular resonator.
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公开(公告)号：US11170751B1
公开(公告)日：2021-11-09
申请号：US17026758
申请日：2020-09-21
发明人： Taehwa Lee , Xiaopeng Li , Jae Seung Lee , Danil V. Prokhorov , Hideo Iizuka
IPC分类号： G10K11/178
摘要： A system for actively mitigating a buffeting noise in an occupant compartment of a vehicle when the vehicle is moving. The system is configured to determine an estimated effective volume of the occupant compartment, and to determine if a single window of the vehicle occupant compartment is open. Responsive to a determination that a single window of the vehicle occupant compartment is open, and using the estimated effective volume of the occupant compartment, an estimated buffeting noise frequency is determined. Responsive to the estimated buffeting noise frequency, the system determines characteristics of a sound configured to cancel a buffeting noise generated inside the occupant compartment while the vehicle is moving. The system may then control operation of a noise cancelling signal generating system to generate the sound having characteristics configured to cancel the buffeting noise inside the occupant compartment.
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公开(公告)号：US11114080B2
公开(公告)日：2021-09-07
申请号：US16113208
申请日：2018-08-27
发明人： Taehwa Lee , Hideo Iizuka
IPC分类号： G10K11/172 , G10K11/162
摘要： Sound absorption units for fluid ducts include two acoustically coupled pairs of Helmholtz resonators. The two resonators within each pair have identical resonance frequency, however the upstream resonator within each pair is partly filled with an acoustically lossy porous material, so that the upstream resonator within each pair has greater acoustic loss than its coupled downstream resonator. The upstream pair of resonators has a relatively low resonance frequency, while the downstream pair of resonators has a relatively high resonance frequency. The combination of frequency mismatch between the resonator pairs, and loss mismatch within each resonator pair, produces consistently high sound absorption across a broad frequency spectrum.
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公开(公告)号：US20200066245A1
公开(公告)日：2020-02-27
申请号：US16113208
申请日：2018-08-27
发明人： Taehwa Lee , Hideo Iizuka
IPC分类号： G10K11/172 , G10K11/162
摘要： Sound absorption units for fluid ducts include two acoustically coupled pairs of Helmholtz resonators. The two resonators within each pair have identical resonance frequency, however the upstream resonator within each pair is partly filled with an acoustically lossy porous material, so that the upstream resonator within each pair has greater acoustic loss than its coupled downstream resonator. The upstream pair of resonators has a relatively low resonance frequency, while the downstream pair of resonators has a relatively high resonance frequency. The combination of frequency mismatch between the resonator pairs, and loss mismatch within each resonator pair, produces consistently high sound absorption across a broad frequency spectrum.
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公开(公告)号：US20200005756A1
公开(公告)日：2020-01-02
申请号：US16025630
申请日：2018-07-02
发明人： Taehwa Lee , Hideo Iizuka
IPC分类号： G10K11/172 , G10K11/162
摘要： An invisible sound barrier includes a periodic array of spaced apart, columnar unit cells. Each unit cell includes a pair of joined, and inverted, columnar Helmholtz resonators, having neck portions that point in opposite directions. Each of the Helmholtz resonators can be formed of a sound absorbing material and coated with a light reflective material causing light to reflect around the resonators, thereby conferring invisibility. Each of the Helmholtz resonators can alternatively be formed of a light reflecting material, and positioned in between vertical mirrors, with a transparent material filling space between the resonators and the vertical mirrors.
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公开(公告)号：US20240333028A1
公开(公告)日：2024-10-03
申请号：US18192088
申请日：2023-03-29
发明人： Taehwa Lee , Xiaopeng Li , Ziqi Yu
CPC分类号： H02J50/001 , H03H9/205
摘要： A system can be configured to harvest energy from sound waves. The system can include a resonator and an acoustic energy harvester located in the resonator. The acoustic energy harvester can be configured to convert acoustic energy into electrical energy. In some instances, the resonator can be a central resonator, and a plurality of surrounding resonators can be arrayed about the central resonator. The surrounding resonators do not include an acoustic energy harvester.
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公开(公告)号：US20240286440A1
公开(公告)日：2024-08-29
申请号：US18112754
申请日：2023-02-22
发明人： Taehwa Lee , Masaki Nakaoka , Danil V. Prokhorov
CPC分类号： B60C19/002 , B60B21/026 , B60B2900/133
摘要： A sound-absorbing device includes a resonator. The resonator includes a flexible, tube-shaped resonator body having a first end, a second end, and a channel fluidically connecting the first end and the second end. The resonator body is wrapped completely around a hub of a vehicle wheel at least one time and is configured to absorb sound produced within a cavity of a tire of the vehicle wheel.
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