1、 Main materials and structure of space sound absorber:

1. Framework: as a support, it can use wood bars, angle steel or thin-walled steel, etc.

2. Cover layer: commonly used perforated or slotted thin iron sheet, aluminum foil or plastic sheet with perforation rate greater than 20% and thickness of 0.1-1.0mm. Hole diameter is 4-8mm.

3. Sound absorption filler: porous materials such as superfine felt, mineral wool felt and asphalt glass wool felt are generally used, and the materials with good air permeability such as glass fiber cloth and certain strength are used as the mask layer. In humid environment, single or double-layer perforated plates can also be used as the sound absorption layer (in order to increase low-frequency absorption, the perforation rate is generally lower than 5%), replacing porous materials.

4. Lifting parts: such as metal lifting lugs, hooks, bolts, etc. When used, all surfaces are placed in the sound field, which is conducive to give full play to the sound absorption of materials.

2、 The main factors for the design of space absorbers are as follows:

1. Material and structure: common spatial sound absorbers are composed of framework, protective layer and sound-absorbing filler. The selection of materials shall be based on the size, rigidity and decoration requirements of the space absorber. The framework can be made of wood, angle steel, thin-walled section steel, etc. The protective layer can be perforated plate of plastic window screen, plastic mesh, steel wire mesh and various plates (such as steel sheet, aluminum plate, plastic plate, etc.), the plate thickness can be 0.5-1.0mm, the hole diameter can be 4-8mm, and the perforation rate should be greater than 20%. The sound absorption filler is usually made of superfine glass wool wrapped with glass fiber cloth, with the filling density of 25-30kg / m3 and the thickness of 5-10cm according to the spectral characteristics of the sound source.

2. Suspension quantity: the suspension quantity of the space sound absorber shall be calculated and determined according to the sound absorption characteristics of the sound absorber and the increased sound absorption quantity required to reduce the indoor noise (or control the reverberation time). If the total area of the absorber is equal to 30-40% of the top area of the building, the efficiency of the absorber can be achieved. In order to reduce the noise or control the reverberation time, the total area of the space absorber should be 40-50% of the top area of the building.

3. Suspension mode: most of the space absorbers are suspended on the top of the building space, and most of them are suspended from the top. The plate-shaped space absorbers can be hung horizontally, vertically, or horizontally, vertically. Under the same total area, the noise reduction effect is basically the same. The height from the top of the horizontal suspended panel space absorber is generally about 1 / 5 to 1 / 7 of the clear height of the room; if conditions permit, it can be hung lower and closer to the sound source. In order to improve the decoration effect of suspended space absorbers, the form, color and hanging method of space absorbers should be considered comprehensively. If the sound-absorbing body of the space is hung into a certain artistic pattern, and is matched with lighting, lighting, ventilation and building decoration, the overall effect will be better.