A cellular material barrier system for reducing sound transmission. The cellular material system includes a planar cellular metamaterial arrangement which includes at least one unit cell, the unit cell includes a sound normalizing arrangement, and a planar metamaterial arrangement coupled to the sou
A cellular material barrier system for reducing sound transmission. The cellular material system includes a planar cellular metamaterial arrangement which includes at least one unit cell, the unit cell includes a sound normalizing arrangement, and a planar metamaterial arrangement coupled to the sound normalizing arrangement on a first side, the planar metamaterial arrangement includes a plate, and a frame affixed to the plate, the sound normalizing arrangement configured to normalize incident sound received at non-normal angle to thereby convey sound at normal angles to the planar metamaterial arrangement, the unit cell further comprising a back layer that is coupled to the sound normalizing arrangement on a second side, opposite the first side, the back layer is made from a porous material, including at least one of a fibrous layer, polymeric foams, ceramic foams, and metallic foams.
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1. A cellular material barrier system for reducing sound transmission comprising: a planar cellular metamaterial arrangement, including at least one unit cell, the unit cell including a sound normalizing arrangement; anda planar metamaterial arrangement coupled to the sound normalizing arrangement o
1. A cellular material barrier system for reducing sound transmission comprising: a planar cellular metamaterial arrangement, including at least one unit cell, the unit cell including a sound normalizing arrangement; anda planar metamaterial arrangement coupled to the sound normalizing arrangement on a first side, the planar metamaterial arrangement including a plate, anda frame affixed to the plate,the sound normalizing arrangement configured to normalize incident sound received at non-normal angles to thereby convey sound at normal angles to the planar metamaterial arrangement. 2. The cellular material barrier system of claim 1, the sound normalizing arrangement comprises a lattice structure having a plurality of sound normalizing cells, the plurality of sound normalizing cells configured to normalize incident sound for a frequency range. 3. The cellular material barrier system of claim 2, the frequency range between 1 and 4,000 Hz. 4. The cellular material barrier system of claim 2, the frequency range between 1 and 10,000 Hz. 5. The cellular material barrier system of claim 3, each cell of the plurality of sound normalizing cells having a polygon shape with a depth of at least about 2 mm. 6. The cellular material barrier system of claim 2, the sound normalizing arrangement made from a low sound speed porous material. 7. The cellular material barrier system of claim 2, the sound normalizing arrangement made from wood. 8. The cellular material barrier system of claim 2, the sound normalizing arrangement made from at least one of a composite, polymeric, and metallic materials. 9. The cellular material barrier system of claim 8, a sub-plurality of the plurality of sound normalizing cells filled with porous sound absorbing material. 10. The cellular material barrier system of claim 1, the unit cell further comprising a back layer coupled to the sound normalizing arrangement on a second side, opposite the first side, the back layer made from a porous material, including at least one of a fibrous layer, polymeric foams, ceramic foams, and metallic foams. 11. The cellular material barrier system of claim 10, the porous material includes glass fibers with mass density of less than about 30 kg/m3. 12. The cellular material barrier system of claim 1, wherein ratio of mass of the frame and mass of the plate is between about 1 to about 100. 13. The cellular material barrier system of claim 1, wherein ratio of elastic modulus of the frame material to elastic modulus of the plate material is between about 1 to about 100. 14. A method for improving sound transmission loss (STL), comprising: placing a sound normalization arrangement about a space where improving STL is desired, the sound normalization layer configured to normalize incident sound received at non-normal angles to thereby convey sound at normal angles; andcoupling a planar metamaterial arrangement to the sound normalizing arrangement on a first side, the planar metamaterial arrangement including a plate, anda frame affixed to the plate. 15. The method of claim 14, the sound normalizing arrangement comprises a lattice structure having a plurality of sound normalizing cells, the plurality of sound normalizing cells configured to normalize incident sound for a frequency range. 16. The method of claim 15, the frequency range between 1 and 4,000 Hz. 17. The method of claim 15, the frequency range between 1 and 10,000 Hz. 18. The method of claim 16, each cell of the plurality of sound normalizing cells having a polygon shape with a depth of at least about 2 mm. 19. The method of claim 14, the sound normalizing arrangement made from a low sound speed porous material. 20. The method of claim 15, the sound normalizing arrangement made from a composite material. 21. The method of claim 20, a sub-plurality of the plurality of sound normalizing cells filled with porous sound absorbing material. 22. The method of claim 14, further comprising coupling a back layer to the sound normalizing arrangement on a second side, opposite the first side, the back layer made from a porous material, including at least one of a fibrous layer, polymeric foams, ceramic foams, and metallic foams. 23. The method of claim 22, the porous material includes glass fibers with mass density of less than about 30 kg/m3. 24. The method of claim 14, wherein ratio of mass of the frame and mass of the plate is between about 1 to about 100. 25. The method of claim 14, wherein ratio of elastic modulus of the frame material to elastic modulus of the plate material is between about 1 to about 100.
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