Soundproof structure

1. A laminated soundproof structure formed by laminating a single layer soundproof structure having one or more soundproof cells arranged in a two-dimensional plane,

wherein each of the one or more soundproof cells of the single layer soundproof structure comprises a frame having a through-hole, a film fixed to the frame, and an opening portion configured to include one or more holes drilled in the film,

the single layer soundproof structure has a basic shielding peak frequency, which is determined by the opening portion of each of the one or more soundproof cells and a mass of the film without a weight and at which a transmission loss is maximized, on a lower frequency side than a first natural vibration frequency of the film of each of the one or more soundproof cells,

one or more of the soundproof cells of one of the laminated single layer soundproof structures and one or more other soundproof cells of the other laminated single layer soundproof structure are laminated,

each of the one or more other soundproof cells is configured to include the frame, the film, and the opening portion or the frame and the film, and

at least some of the one or more other soundproof cells are different from the one or more of the laminated soundproof cells in conditions of at least one of the frame, the film, or the opening portion.

2. The soundproof structure according to claim 1 ,

wherein the one or more soundproof cells are a plurality of soundproof cells arranged in a two-dimensional manner, and

the one or more other soundproof cells are a plurality of other second soundproof cells arranged in a two-dimensional manner.

3. The soundproof structure according to claim 1 ,

wherein the laminated soundproof structure has a minimum value at which a transmission loss due to natural vibration of the laminated soundproof cells is minimized, and has a lamination shielding peak frequency, which is determined by the opening portions of the laminated soundproof cells and at which a transmission loss is maximized, on a lower frequency side than the minimum frequency at which the transmission loss is minimized, and

sound in a frequency band centered on the lamination shielding peak frequency is selectively insulated.

4. The soundproof structure according to claim 1 ,

wherein the laminated soundproof structure has at least one layer of the single layer soundproof structure, in which the one or more other soundproof cells each of which is configured to include the frame and the film are arranged, in at least a part of a laminated structure.

5. The soundproof structure according to claim 1 ,

wherein the laminated soundproof structure has the single layer soundproof structure, in which the one or more other soundproof cells each of which is configured to include the frame and the film are arranged on an outermost surface, in at least a part of a laminated structure.

6. The soundproof structure according to claim 1 ,

wherein, in the laminated soundproof structure, in at least a part of a laminated structure, all of the laminated single layer soundproof structures are configured to include the frame, the film, and the opening portion.

7. The soundproof structure according to claim 6 ,

wherein the one or more soundproof cells and the one or more other soundproof cells, which are different in conditions of at least one of the frame, the film, or the opening portion, are laminated to have two or more shielding peak frequencies at which a transmission loss is maximized.

8. The soundproof structure according to claim 1 ,

wherein the laminated soundproof structure has a maximum value of an absorbance on a lower frequency side than a maximum value of the transmission loss on a lower frequency side than the first natural vibration frequency of each of the two laminated single layer soundproof structures, which is determined by the opening portion of each of the laminated soundproof cells, due to the single layer soundproof structure being laminated in two layers.

9. The soundproof structure according to claim 1 ,

wherein a frequency on a lower frequency side than a minimum value of the transmission loss corresponding to the first natural vibration frequency of the single layer soundproof structure is included in a range of 10 Hz to 100000 Hz.

10. The soundproof structure according to claim 1 ,

wherein, assuming that a circle equivalent radius of the frame is R 2 ( m ), a thickness of the film is t 2 ( m ), a Young's modulus of the film is E 2 (Pa), and a density of the film is d (kg/m 3 ), a parameter B expressed by following Equation (1) is 15.47 or more and 235000 or less,

B=t 2/ R 2 2 *V ( E 2/ d )  (1).

11. The soundproof structure according to claim 1 ,

wherein, in a case where the one or more soundproof cells of the laminated single layer soundproof structures of the laminated soundproof structure are a plurality of soundproof cells arranged in a two-dimensional manner, 60% or more of the soundproof cells of the single layer soundproof structures are formed by the frame, the film, and the opening portion of the same size.

12. The soundproof structure according to claim 1 ,

wherein the frame of each of the laminated soundproof cells of the laminated soundproof structure has a continuous frame structure, and

in at least some of the laminated soundproof cells, the film is disposed on two or more planes of at least one plane of two surfaces of the frame structure and/or a plane of an intermediate portion between the two surfaces.

13. The soundproof structure according to claim 1 ,

wherein, in at least some of the laminated soundproof cells of the laminated soundproof structure, a space between the films of the soundproof cells laminated so as to be adjacent to each other is blocked by the frame.

14. The soundproof structure according to claim 1 ,

wherein, in at least some of the laminated soundproof cells of the laminated soundproof structure, the opening portions drilled in the films overlap each other as viewed from a direction perpendicular to the film.

15. The soundproof structure according to claim 1 ,

wherein the distance between the two laminated single layer soundproof structures of the laminated soundproof structure is smaller than a wavelength of a shielding peak at which the transmission loss is maximized.

16. The soundproof structure according to claim 1 ,

wherein “conditions of at least one of the frame, the film, or the opening portion of the laminated soundproof cells are different” means that an average of a shift amount of each of a first natural vibration frequency and a shielding peak frequency of a spectrum of the transmission loss between the soundproof cells of the laminated single layer soundproof structures of the laminated soundproof structure is more than 10%.