| 摘要 |
<p>PURPOSE:To obtain a silencing effect for a predetermined noise by forming a resonance chamber by laminating two or more blocks and changing the characteristic of resonance frequency to be silenced by changing a quantity of the laminated blocks. CONSTITUTION:A cylindrical external wall 2 is provided for a cylindrical internal wall 1 forming a wind tunnel 5 in the center part, and by forming a side plate 6 in one side surface, a block 9 is constituted. Further by providing packings 7A and 7B to be interposed, an opening part 9A in the other side surface of the block 9 is adapted to a side end surface 8A of a member 8, and a resonance chamber 3 is formed. While providing partitions 9B in the resonance chamber 3 and dividing it into two or more resonance chamber 3, the respective resonance chamber 3 communicates with the wind tunnel 5 through a communication hole 4 provided in the internal wall 1.</p> |
