THE HONG KONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
대리인 / 주소
Nath, Goldberg & Meyer
인용정보
피인용 횟수 :
3인용 특허 :
10
초록▼
A sound attenuation panel is configured with a substantially acoustically transparent planar, rigid frame divided into a plurality of individual, substantially two-dimensional cells. A sheet of a flexible material is fixed to the rigid frame, and a plurality of platelets fixed to the sheet of flexib
A sound attenuation panel is configured with a substantially acoustically transparent planar, rigid frame divided into a plurality of individual, substantially two-dimensional cells. A sheet of a flexible material is fixed to the rigid frame, and a plurality of platelets fixed to the sheet of flexible material such that each individual cell of the plurality of cells is provided with a respective platelet to establish a resonant frequency, the resonant frequency defined by the planar geometry of the individual cells, the flexibility of the flexible material and the platelets. The cells are divided into at least two different types of the individual cells, configured so that sound waves emitted by a first type of said different types of individual cells establishes a sound cancellation pattern with sound waves emitted by a second type of said different individual cells or an aggregation of different types of the individual cells.
대표청구항▼
1. A sound attenuation panel comprising: a substantially acoustically transparent planar, rigid frame divided into a plurality of individual, substantially two-dimensional cells;a sheet of a flexible material fixed to the rigid frame, and a plurality of platelets fixed to the sheet of flexible mater
1. A sound attenuation panel comprising: a substantially acoustically transparent planar, rigid frame divided into a plurality of individual, substantially two-dimensional cells;a sheet of a flexible material fixed to the rigid frame, and a plurality of platelets fixed to the sheet of flexible material such that each individual cell of the plurality of cells is provided with a respective platelet, thereby establishing a resonant frequency, the resonant frequency defined by the planar geometry of the respective individual cells, the flexibility of the flexible material and said respective platelet thereon, and the resonant frequency tuned by adjusting at least one of a mass on the sheet of flexible material, said mass comprising one of said platelets, dimensions of the flexible material and tension on the flexible material; andthe plurality of cells divided into at least two different types of the individual cells, distributed in a planar arrangement in an alternating fashion or according to a predetermined pattern on the sound attenuation panel, the different types of individual cells configured so that sound waves emitted by a first type of said different types of individual cells establishes a sound cancellation pattern with sound waves emitted by a second type of said different individual cells or an aggregation of different types of the individual cells. 2. The sound attenuation panel of claim 1, further comprising the different types of individual cells having a configuration comprising the planar geometry of the respective individual cells, the flexibility of the flexible material and said respective platelet thereon that establishes an out-of-phase relationship between sound waves emitted by at least two of the different types of individual cells. 3. The sound attenuation panel of claim 1, wherein at least a plurality of the cells comprise sizable orifices or openings through which air can flow freely sufficiently for providing or promoting air ventilation. 4. The sound attenuation panel of claim 1, further comprising each cell constructed into said least two different types of the individual cells as type-A cells and type-B cells arranged in a predetermined alternating pattern. 5. The sound attenuation panel of claim 4, wherein: the type-A cells each comprise a sheet of elastic material fixed on the cell frame, and at least one platelet attached to the sheet; andthe type-B cells each comprise a sheet of elastic material fixed on the cell frame, and either at least one platelet having a weight different from that of platelets attached to the type-A cells attached to the sheet, or without a platelet. 6. The sound attenuation panel of claim 4, wherein said platelets have a mass in the range of 0.1 to 10 g. 7. The sound attenuation panel of claim 4, wherein said sheet comprises multiple layers of said flexible material. 8. The sound attenuation panel of claim 4, wherein: the sheet of flexible materials comprise impermeable flexible material. 9. A sound attenuation panel comprising: a plurality of panels stacked together, wherein each panel of the plurality of panels comprises a rigid frame divided into a plurality of individual cells;a sheet of a flexible material;a plurality of platelets affixed to the sheet of flexible material such that each of the plurality of individual cells has attached thereto at least one of said platelets, whereby said cells have resonant frequencies defined by the planar geometry of each said individual cell, the flexibility of said flexible material and said respective platelet thereon, and the resonant frequency tuned by adjusting at least one of a mass on the sheet of flexible material, said mass comprising one of said platelets, dimensions of the flexible material and tension on the flexible material; andthe plurality of cells divided into at least two different types of the individual cells, distributed in a planar arrangement in an alternating fashion or according to a predetermined pattern on the panel, the different types of individual cells configured so that sound waves emitted by a first type of said different types of individual cells establishes a sound cancellation pattern with sound waves emitted by a second type of said different individual cells or an aggregation of different types of the individual cells. 10. The sound attenuation panel of claim 9, further comprising the different types of individual cells having a configuration comprising the planar geometry of the respective individual cells, the flexibility of the flexible material and said respective platelet thereon that establishes an out-of-phase relationship between sound waves emitted by at least two of the different types of individual cells. 11. A sound attenuation panel comprising: a substantially acoustically transparent planar, rigid frame divided into a plurality of individual, substantially two-dimensional cells;a sheet of a flexible solid material fixed to the rigid frame, and a plurality of platelets fixed to the sheet of flexible material such that each cell is provided with a respective platelet, thereby establishing a resonant frequency, the resonant frequency defined by the planar geometry of the respective individual cells, the modulus of elasticity of the solid material and said respective platelet thereon, and the resonant frequency tuned by adjusting at least one of a mass on the sheet of flexible material, said mass comprising one of said platelets, dimensions of the flexible material and tension on the flexible material; anda membrane selected to provide a resonant characteristic for at least a subset of the cells, with selection criteria including at least one of thickness of the membrane, elasticity of the membrane, Young's modulus and the Poisson ratio of the membrane, the mass and dimension of the platelet, and the cell dimension, said resonant characteristic providing a selection of a working frequency in the range from subsonic (below 1 Hz) to ultrasonic (above 1 MHz). 12. The sound attenuation panel of claim 11, further comprising: the plurality of cells divided into at least two different types of the individual cells, distributed in a planar arrangement in an alternating fashion or according to a predetermined pattern on the panel, the different types of individual cells configured so that sound waves emitted by a first type of said different types of individual cells establishes a sound cancellation pattern with sound waves emitted by a second type of said different individual cells or an aggregation of different types of the individual cells. 13. The sound attenuation panel of claim 11, wherein the thickness of the sheet of solid materials varies across the cell. 14. The sound attenuation panel of claim 11, further comprising: multiple layers of said solid material. 15. The sound attenuation panel of claim 11, further comprising: a plurality of panels stacked together wherein each said panel comprises a rigid frame divided into a plurality of individual cells, a sheet of a solid material, and a plurality of platelets, with each platelet fixed to said sheet of solid material to provide each cell with a respective platelet;a working frequency of the sound attenuation structure defined by the planar geometry of the individual cells, the flexibility of said solid material, and said respective platelet thereon. 16. The sound attenuation panel of claim 15, further comprising: each said panel formed with platelets having different weights from other said panels in the panel. 17. A sound attenuation panel comprising: a substantially acoustically transparent planar, rigid frame divided into a plurality of individual, substantially two-dimensional cells;a sheet of a flexible material fixed to the rigid frame, and a plurality of platelets fixed to the sheet of flexible material such that each cell is provided with a respective platelet, thereby establishing a resonant frequency, the resonant frequency defined by the planar geometry of the respective individual cells, the flexibility of the flexible material and said respective platelet thereon, and the resonant frequency tuned by adjusting at least one of a mass on the sheet of flexible material, said mass comprising one of said platelets, dimensions of the flexible material and tension on the flexible material; andthe flexible material having a wrinkle or corrugation to permit distortion with reduced material elasticity, thereby permitting the flexible material to distort beyond that afforded by a planar material of the same type, while retaining mechanical strength in supporting the plurality of platelets. 18. The sound attenuation panel of claim 17, wherein the wrinkle or corrugation of the sheets results in the resonant frequencies of the cells by lowering the resonant frequencies as compared to that achieved by the use of flat membrane of the same material. 19. The sound attenuation panel of claim 17, wherein the thickness of the sheet of solid materials varies across the cell. 20. The sound attenuation panel of claim 17, further comprising: multiple layers of said solid material. 21. The sound attenuation panel of claim 17, further comprising: a plurality of panels stacked together wherein each said panel comprises a rigid frame divided into a plurality of individual cells, a sheet of a solid material, and a plurality of platelets, with each platelet fixed to said sheet of solid material to provide each cell with a respective platelet;a working frequency of the sound attenuation structure defined by the planar geometry of the individual cells, the flexibility of said solid material, and said respective platelet thereon. 22. The sound attenuation panel of claim 21, further comprising: each said panel formed with platelets having different weights from other said panels in the panel. 23. The sound attenuation panel of claim 17, further comprising: adjacent frames facing each other with a distance having a predetermined relationship to the size of said frames. 24. The sound attenuation panel of claim 17, further comprising: the cells comprising rigid plates, wherein the rigid plates have a flapping mode providing a tunable function whereby the frequency decreases in an approximate relationship to the inverse square root of the mass of plates. 25. The sound attenuation panel of claim 17, further comprising: the cells comprising rigid plates, wherein the rigid plates have a flapping mode providing a tunable function whereby the flapping mode provides a tunable function based on the tunable resonant frequencies, said resonant frequencies tunable by varying the distance of separation between asymmetric plates, or the thickness, elasticity, such as the Young's module and the Poisson ratio, and the wrinkle patterns of the membrane, the mass of the plates, and the cell dimension. 26. The sound attenuation panel of claim 17, further comprising: a plurality of plates in each unit cell. 27. The sound attenuation panel of claim 17, further comprising: the cells forming structural units comprising masses subject to vibratory motion and the vibratory motion has resonant frequencies that increases or decreases by varying the lateral dimensions of the structural units, the membrane elasticity and wrinkle patterns, and the material type and dimension of the plates, thereby permitting selection of the resonant frequency as a lossy core.
McKnight, Geoffrey P.; Chang, Chia-Ming; Stewart, Tiffany A.; Montgomery, Joshua M.; Hogan, Janet M.; Zientek, Thomas A.; Ludin, Douglas R., Acoustic barrier support structure.
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