In one embodiment, provided is a sound attenuating barrier having a core structure between face sheets with a mass attached to at least one face sheet, and having a spatially varied stiffness distribution and/or a spatially varied density. The sound attenuating barrier may include at least one face
In one embodiment, provided is a sound attenuating barrier having a core structure between face sheets with a mass attached to at least one face sheet, and having a spatially varied stiffness distribution and/or a spatially varied density. The sound attenuating barrier may include at least one face sheet and/or core having a spatially varied stiffness distribution and/or a spatially varied mass distribution. In one embodiment, a sound attenuating barrier is provided having a core structure between face sheets with a mass structure attached to at least one face sheet, with the core/and or face sheet(s) being constructed to design an effective vibration length as well as enable a variable local stiffness and mass across the sound attenuating barrier such that the sandwich structure provides variable resonance frequency responses and broadband coverage.
대표청구항▼
1. A sound attenuating barrier comprising: a) face sheets;b) a core structure between the face sheets;c) a mass structure attached to at least one of the face sheets; andd) the sound attenuating barrier further comprising at least one of: (1) a spatially varied stiffness distribution; or (2) a spati
1. A sound attenuating barrier comprising: a) face sheets;b) a core structure between the face sheets;c) a mass structure attached to at least one of the face sheets; andd) the sound attenuating barrier further comprising at least one of: (1) a spatially varied stiffness distribution; or (2) a spatially varied density across the sound attenuation barrier. 2. The sound attenuating barrier of claim 1, wherein at least one face sheet comprises a non-planar face sheet. 3. The sound attenuating barrier of claim 1, wherein at least one of the face sheets is a curved face sheet. 4. The sound attenuating barrier of claim 1, wherein the sound attenuating barrier comprises a three dimensional enclosure. 5. The sound attenuating barrier of claim 1, wherein the at least one of: (a) the variable local stiffness across the sound attenuating barrier; or (b) the variable density across the sound attenuating barrier is configured such that a single pair of interacting vibration modes are created in response to incident sound within a desired frequency range. 6. The sound attenuating barrier of claim 1, wherein at least one face sheet comprises: (a) a spatially varied stiffness distribution; or (b) a spatially varied mass distribution. 7. The sound attenuating barrier of claim 6, wherein the at least one face sheet comprises stiffed areas configured so as to broaden a bandwidth by increasing the third mode resonance. 8. The sound attenuating barrier of claim 7, wherein the at least one face sheet further comprises at least one reduced mass area configured so as to broaden a bandwidth by increasing the third mode resonance. 9. The sound attenuating barrier of claim 6, wherein the at least one face sheet comprises reduced mass areas configured so as to broaden a bandwidth by increasing the third mode resonance. 10. The sound attenuating barrier of claim 6, wherein the at least one face sheet comprises a plurality of generally linear stiffener regions. 11. The sound attenuating barrier of claim 6, wherein the at least one face sheet comprises a plurality of generally curved stiffener regions. 12. The sound attenuating barrier of claim 6, wherein at least one face sheets comprises at least one stiffened annular region. 13. The sound attenuating barrier of claim 12, wherein the at least one stiffened annular region is ellipse shaped. 14. The sound attenuating barrier of claim 12, wherein the at least one face sheet further comprises at least one reduced mass annular region. 15. The sound attenuating barrier of claim 6, wherein the at least one face sheet comprises at least one reduced mass annular region. 16. The sound attenuating barrier of claim 6, wherein the core structure comprises at least one of: (a) a spatially varied stiffness distribution; or (b) a spatially varied mass distribution. 17. The sound attenuating barrier of claim 1, wherein the core structure comprises at least one of: (a) a spatially varied stiffness distribution; or (b) a spatially varied mass distribution. 18. The sound attenuating barrier of claim 17, wherein the core structure is configured so as to broaden a bandwidth by increasing the third mode resonance of the sound attenuating barrier. 19. The sound attenuating barrier of claim 17, wherein the core structure comprises at least a portion having greater stiffness than an adjacent portion of the core structure. 20. The sound attenuating barrier of claim 17, wherein the core structure comprises a variable density across the sound attenuating barrier. 21. The sound attenuating barrier of claim 17, wherein the core structure comprises an ordered three dimensional microtruss. 22. The sound attenuating barrier of claim 17, wherein at least a portion of the core structure comprises cross linking members. 23. The sound attenuating barrier of claim 17, further comprising a stiffening sheet within the core structure. 24. The sound attenuating barrier of claim 17, further comprising a stiffening layer within the core structure. 25. The sound attenuating barrier of claim 17 further comprising a layer comprising stiff materials and compliant materials within the core structure. 26. The sound attenuating barrier of claim 17, wherein the core structure comprises support structures extending between the face sheets and having a distribution of different angles across the core structure with respect to the face sheets. 27. The sound attenuating barrier of claim 17, wherein the core structure is attached to the face sheets. 28. The sound attenuating barrier of claim 17, wherein the core structure abuts the face sheets and comprises at least a portion abutting the core structure but not attached to a face sheet. 29. The sound attenuating barrier of claim 17, wherein the core structure comprises a portion adjacent to but recessed from a face sheet. 30. The sound attenuating barrier of claim 17, wherein the core structure comprises a non-uniform thickness. 31. The sound attenuating barrier of claim 30, wherein the face sheets both comprise a non-planar face sheet, and wherein opposing face sheets are symmetrical with respect to a plane extending between the non-planar face sheets.
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이 특허에 인용된 특허 (18)
Sheng, Ping; Yang, Zhiyu; Yang, Min; Sun, Liang; Ma, Guancong; Xiao, Songwen, Acoustic and vibrational energy absorption metamaterials.
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