An acoustic structure, including a pipe having a plurality of cavities that are partitioned by a partition, each of the plurality of cavities extending in a first direction that is a longitudinal direction of the pipe, wherein the pipe has at least one opening which permits the plurality of cavities
An acoustic structure, including a pipe having a plurality of cavities that are partitioned by a partition, each of the plurality of cavities extending in a first direction that is a longitudinal direction of the pipe, wherein the pipe has at least one opening which permits the plurality of cavities to communicate with an exterior of the pipe, a position of each of the at least one opening in the first direction being a first position.
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1. An acoustic structure, comprising a first pipe and a second pipe each having a plurality of cavities that are partitioned by a partition, each of the plurality of cavities extending in a first direction that is a longitudinal direction of the first and second pipes, the plurality of cavities of t
1. An acoustic structure, comprising a first pipe and a second pipe each having a plurality of cavities that are partitioned by a partition, each of the plurality of cavities extending in a first direction that is a longitudinal direction of the first and second pipes, the plurality of cavities of the first pipe and the second pipe being arranged in a second direction that is perpendicular to the first direction, wherein the first pipe has a plurality of openings which permit the plurality of cavities of the first pipe to communicate with an exterior of the first pipe, the plurality of openings being arranged in the second direction and being provided for at least two cavities, which are adjacent to each other in the second direction, of the plurality of cavities of the first pipe, a position of each of the plurality of openings in the first direction being a first position,wherein the second pipe has a plurality of openings which permit the plurality of cavities of the second pipe to communicate with an exterior of the second pipe, the plurality of openings being arranged in the second direction and being provided for at least two cavities, which are adjacent to each other in the second direction, of the plurality of cavities of the second pipe, a position of each of the plurality of openings in the first direction being a second position that is different from the first position,wherein lengths of the plurality of cavities of the first pipe in the first direction are the same as each other,wherein the plurality of openings of the first pipe are formed such that each of the plurality of cavities of the first pipe has a first resonance frequency, andwherein the plurality of openings of the second pipe are formed such that each of the plurality of cavities of the second pipe has a second resonance frequency that is different from the first resonance frequency. 2. The acoustic structure according to claim 1, wherein the plurality of cavities of the first pipe and the second pipe have the same cross-sectional area taken along a plane perpendicular to the first direction. 3. The acoustic structure according to claim 1, wherein each of the plurality of cavities of the first pipe and the second pipe is partially defined by a first flat plate portion and a second flat plate portion that are arranged in a third direction so as to be parallel to each other, the third direction being perpendicular to the first direction and the second direction, andwherein each of the plurality of openings is formed in the first flat plate portion. 4. The acoustic structure according to claim 3, which is to be installed in an acoustic space such that the first direction and the second direction are parallel to a wall or a ceiling of the acoustic space and such that the second flat plate portion is opposed to the wall or the ceiling. 5. The acoustic structure according to claim 1, wherein the first pipe and the second pipe are disposed so as to be arranged in the second direction. 6. The acoustic structure according to claim 5, wherein a number of the plurality of cavities of the first pipe is greater than or equal to a number of the plurality of cavities of the second pipe, the first pipe having a first distance that is larger than a second distance of the second pipe, the first distance being a larger one of distances between respective opposite ends in the first direction of the first pipe and the plurality of opening of the first pipe, the second distance being a larger one of: distances between respective opposite ends in the first direction of the second pipe and the plurality of openings of the second pipe. 7. The acoustic structure according to claim 1, wherein lengths of the plurality of cavities of the second pipe in the first direction are the same as each other. 8. The acoustic structure according to claim 7, wherein each of the lengths of the plurality of cavities of the first pipe is the same as each of the lengths of the plurality of cavities of the second pipe.
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