CPC G10K 11/172 (2013.01) [F24F 13/24 (2013.01); G10K 11/168 (2013.01); F24F 2013/245 (2013.01)] | 17 Claims |
1. A soundproof structure body comprising:
a first tube structure; and
a second tube structure connected to the first tube structure and having a cross-sectional area different from the first tube structure,
wherein a direction from the second tube structure toward the first tube structure is set to a waveguide forward direction,
the first tube structure and the second tube structure are bent and connected to each other,
a structure body having a cross-sectional area smaller than a cross-sectional area of the first tube structure is installed in the first tube structure, and
assuming that there are three or more consecutive frequencies forming a stable air column resonance mode in the first tube structure, three consecutive frequencies of the three or more consecutive frequencies are denoted by fi, fi+1, and fi+2, where i is integer, an intermediate frequency between first two adjacent frequencies fi and fi+1 is denoted by fn, where n is integer, an intermediate frequency between next two adjacent frequencies fi+1 and fi+2 is denoted by fn+1, a transmission loss in a case where the structure body is installed in the first tube structure with respect to a case where the structure body is not installed in the first tube structure is positive at the frequencies fn and fn+1.
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