Sound isolation plate structure
First Claim
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1. A sound isolation structure comprising:
- a a single, flat perforated board in which a plurality of holes are exclusively formed; and
a plurality of cylindrical pipe-like portions which extend from peripheral portions of the plurality of holes;
wherein;
a diameter and a length of a bore defined by each of the pipe-like cylindrical portions are selected in conjunction with a thickness of the single, flat perforated board to define a plurality of first and second pneumatic vibration systems wherein the air which is located within each of the pipe-like cylindrical portions acts as a first mass, while a first portion of the air which is located adjacent the outer diameter of the pipe-like cylindrical portions acts as a second mass and a remaining second portion of the air which is located adjacent the outer diameter of the pipe-like cylindrical portions acts as a spring which is associated with the second mass.
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Abstract
A sound isolation plate structure comprises a sheet of perforated board in which a plurality of holes are formed, and cylindrical portions provided on one surface side of the perforated board to extend from peripheral portions of the holes like cylinders unilaterally, wherein pneumatic vibration systems are formed between the cylindrical portions. Accordingly, a resonance frequency of vibration systems is easily tuned by adjusting a projection amount of the cylindrical portions so as to mate with a frequency of the noise to be isolated.
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Citations
18 Claims
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1. A sound isolation structure comprising:
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a a single, flat perforated board in which a plurality of holes are exclusively formed; and a plurality of cylindrical pipe-like portions which extend from peripheral portions of the plurality of holes;
wherein;a diameter and a length of a bore defined by each of the pipe-like cylindrical portions are selected in conjunction with a thickness of the single, flat perforated board to define a plurality of first and second pneumatic vibration systems wherein the air which is located within each of the pipe-like cylindrical portions acts as a first mass, while a first portion of the air which is located adjacent the outer diameter of the pipe-like cylindrical portions acts as a second mass and a remaining second portion of the air which is located adjacent the outer diameter of the pipe-like cylindrical portions acts as a spring which is associated with the second mass. - View Dependent Claims (2, 3, 4, 5, 6, 13, 18)
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7. A sound isolation structure comprising:
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first and second flat perforated boards in which a first plurality of first holes and a second plurality of second holes are respectively formed, each of the first plurality of first holes in the first perforated board being spaced from an adjacent hole by a first predetermined interval and arranged so as to be each opposite a second hole in the second flat perforate board; and a plurality of cylindrical portions, each of the cylindrical portions connecting one of the first holes with a second hole so as to provide a continuous un-interrupted communication therebetween, the number of second holes in the second board being greater than the number of first holes in the first board, the second holes being spaced from one another by a second predetermined interval which is less than the first predetermined interval by a predetermined amount so that a predetermined number of un-connected second holes open into an air chamber defined between the first and second boards and are entirely located opposite a non-perforate portion of the first board, so that pneumatic vibration systems are formed wherein air in each of the cylindrical portions acts as a first mass, while air which is located in each of the second un-connected holes and the air which is located above each of the second un-connected holes and within the air chamber defined between the first and second board, respectively act as a second mass and a spring associated with the second mass. - View Dependent Claims (8, 9, 10, 11, 12, 14, 15, 16, 17)
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Specification