| 摘要 |
FIELD: machine building.SUBSTANCE: sound absorber of combined type contains sound absorbers of active and reactive types located on rigid framework, framework is out of two parts, at that bottom part, i.e. reactive part, is made as rigid hollow cylinder, its bottom is connected with a support disk connecting it with a support disk on which via the resilient dampening element a top part of the framework is installed, it is made as rigid perforated cylindrical shell with perforated cover and solid base connected with the support disk, the cylindrical shell cavity is filled with sound-absorbing material, and the top and the bottom parts are connected by means of the resilient dampening element ensuring dampening of HF oscillations; at that to the perforate cover of the cylindrical shell the element is hingedly connected, using this element the framework is secured to the required object, for example, ceiling of the production room, and around the rigid perforated cylindrical shell at least one helical sound-absorbing element is installed made as cylindrical screw spring enclosing it and resting against the support disk; at that the cylinder cavity of the framework reactive part is tightly covered by the support disk with at least one hole functioning as mouth of Helmholtz resonator, that is crated together with the cylinder cavity, and around the hollow cylinder at least one helical sound-absorbing element is installed, that is made as cylindrical screw spring enclosing the hollow cylinder and resting against the support disks.EFFECT: improved efficiency of noise suppression at high frequencies.2 cl, 1 dwg |
