Overview

Overview of space absorbers:

     It is a sound-absorbing component dispersedly suspended on the upper part of the building space to reduce indoor noise or improve indoor sound quality. The space sound absorbing body has the characteristics of less material, light weight, low investment, high sound absorption efficiency, flexible layout and convenient construction. Many countries have begun to use space sound absorbers since the 1950s, and their applications have gradually become widespread in the 1970s. It has been used in China since the 1970s. In the 1980s, the number of applications increased. According to the use nature, area, floor height, structural form, decoration requirements and sound source characteristics of the building, the space sound absorbing body can have various shapes such as plate, cube, cylinder, cone and sphere. Among them, the plate structure is the simplest and the most widely used. Space sound absorbers are mostly used in indoor gymnasiums. Their various shapes and arrangements can enhance the indoor decoration effect. The most important thing is their sound absorption performance, which can prevent echo defects in large halls and effectively reduce reverberation time.

The principle of space absorber:

     Compared with the sound-absorbing material on the indoor surface, the space sound absorber has higher sound absorption efficiency under the same projected area. This is because the space sound absorber has a larger effective sound absorption area (including the upper top surface, the lower bottom surface and the side surface of the space sound absorber); It is reflected multiple times and absorbed multiple times, which increases the sound absorption and improves the sound absorption efficiency. Usually, the improvement of sound absorption efficiency in the middle and high frequency bands is the most significant.

     The sound absorption performance of a space absorber is often expressed by the effective sound absorption of a single absorber at different frequencies. The effect of sound absorption and noise reduction (or reverberation time reduction) of space absorbers mainly depends on the number of space absorbers, suspension spacing, materials and structures, and is also related to the sound field conditions in the building space. If the original indoor surface has little sound absorption, more reflected sound, and a long reverberation time, the noise reduction effect after hanging the space absorber is usually 5-8 decibels, and the highest can reach 10-12 decibels; The sound absorption of the indoor surface is relatively large, and the reverberation process is not obvious, so it is not necessary to hang the sound absorbing body in the space.

Space absorber design:

     The following three factors are mainly considered.

     1. Material and structure

     A common space sound absorber consists of a skeleton, a protective layer and sound-absorbing fillers. The choice of material should be determined according to the size, rigidity and decoration requirements of the space sound absorbing body. The frame can be made of wood, angle steel, thin-walled steel, etc. The protective surface layer can be made of plastic screens, plastic mesh, steel mesh and perforated plates of various plates (such as thin steel plates, aluminum plates, plastic plates, etc.). Should be greater than 20%. The sound-absorbing filler usually adopts ultra-fine glass wool outsourcing glass fiber cloth, and its filling density can be 25-30 kg/m3, and the thickness should be selected within the range of 5-10 cm according to the spectral characteristics of the sound source

     2. Number of suspensions

     The number of suspended sound-absorbing bodies in the space should be calculated and determined according to the sound-absorbing characteristics of the sound-absorbing bodies and the increased sound absorption required to reduce indoor noise (or control reverberation time). When the plate-shaped space absorber is used in the design, if the total area of the sound-absorbing body is equivalent to 30-40% of the roof area of the building, the sound-absorbing efficiency of the plate-shaped space sound-absorbing body can reach the optimum value. In actual engineering, in order to meet the requirements of reducing noise or controlling reverberation time, the total area of the space sound-absorbing body should be 40-50% of the roof area of the building; if the number of space sound-absorbing bodies is increased, it will affect the sound absorption of the space The overall sound absorption performance of the body has caused a waste of funds.

     3. Suspension method

     Space sound absorbers are mostly suspended on the top of the building space, and most of them are suspended from the ceiling. The plate-shaped space sound-absorbing body can be hung horizontally or vertically, and can also be hung horizontally and vertically. Under the same total area, the noise reduction effect is basically the same. The height from the top of the horizontally suspended plate-shaped space sound-absorbing body is generally about 1/5 to 1/7 of the clear height of the room. Generally speaking, considering the difficulty of construction, the space sound-absorbing body is suspended on the steel frame at the top of the building. Below, its height will be about 1/5 to 1/7 of the clear height of the room, meeting the requirements of sound absorption and decoration; if conditions permit, it can be hung lower and closer to the sound source. In order to improve the architectural decoration effect of the suspended space sound-absorbing body, the form, color and suspension method of the space sound-absorbing body should be considered comprehensively. If the space sound-absorbing body is suspended into a certain artistic pattern and cooperates with lighting, lighting, ventilation and architectural decoration, the overall effect will be better.

Application of Space Absorbers:

     Widely used in indoor gymnasiums, badminton halls, clubs, swimming pools, factories with excessive noise, and also suitable for radio stations, TV recording studios, studios, schools, grand theaters, libraries, cultural centers, auditoriums, multi-functional halls, Meeting rooms and concert halls and other places that require high sound quality.