| 摘要 |
FIELD: machine building.SUBSTANCE: in sound-absorbing structure containing solid and perforated surfaces a multi-layer sound-absorbing material is located between the surfaces. The sound-absorbing element is made out of three layers: central layer out of sound reflecting material with complex profile, containing uniformly distributed hollow tetrahedrons, and symmetrically abutting to it sound-absorbing layers out of the materials with different density. As the sound-absorbing material the mats out of mineral wool "Rockwool", or "URSA", or out of basalt wool P-75 are used. The sound-absorbing element is lined with acoustically transparent material.EFFECT: enhanced efficiency of sound absorption and reliability of the structure.5 cl, 1 dwg |
