Standard sizes: 600*1200*50mm, 600*2400*50mm, 600*1800*50mm, 1200*1200*50mm, etc. Thickness can be made in 50mm, 75mm, 80mm, 100mm, or custom sizes upon buyer's request; waste calculation extra.
An acoustic absorber is a suspended component dispersed in the upper part of a building space, designed to reduce indoor noise or improve the indoor sound quality. It features minimal material usage, light weight, cost-effectiveness, high absorption efficiency, flexible arrangement, and easy installation. Acoustic absorbers come in various shapes such as plate, block, cylindrical, conical, and spherical, depending on the building's usage, area, height, structure, decoration requirements, and sound source characteristics. The plate structure is the simplest and most widely used. Acoustic absorbers are commonly used in indoor sports halls, where their diverse shapes and arrangements enhance the decorative effect. Most importantly, their sound absorption properties prevent echo defects in large halls and effectively reduce the reverberation time.
Section 1: Principle of Sound Absorbing Elements
Acoustic absorbers have a higher sound absorption efficiency than acoustic materials on indoor surfaces, given the same projected area. This is due to the larger effective absorption area of acoustic absorbers (including their top, bottom, and side surfaces); plus, as sound waves reflect multiple times between the top of the absorber and the building's ceiling, they are absorbed repeatedly, increasing the absorption volume and enhancing efficiency. This improvement is particularly evident in the mid-to-high frequency range. The sound absorption performance of acoustic absorbers is typically represented by the effective absorption volume of individual absorbers at different frequencies. The effectiveness of acoustic absorber noise reduction (or reduction in reverberation time) mainly depends on the number of absorbers, their spacing, the material and structure, and is also related to the acoustic field conditions within the building space. For instance, if the original indoor surface has little absorption, with more reflected sound and a long reverberation time, the addition of acoustic absorbers can significantly improve the situation.
Section II: Materials and Structure of Acoustic Absorbers
Common acoustic absorbers consist of a framework, a facing layer, and an absorbent material. The choice of materials should be based on the size, stiffness, and decoration requirements of the acoustic absorber. The framework can be made of wood, angle steel, thin-walled steel, aluminum frames, etc. The protective facing layer can be fire-resistant fabric, soundproof felt, or glass fiber cloth. The absorbent material usually consists of ultra-fine glass wool wrapped in glass fiber cloth, with a filling density of either 48kg or 64kg of sound-absorbing cotton. The thickness should be selected within a range of 5 to 10 centimeters based on the sound source frequency spectrum characteristics.
Section 3: Suspended Quantity of Sound Absorbing Elements
The number of suspended acoustic absorbers should be calculated and determined based on the acoustic absorption characteristics of the absorbers and the additional absorption required to reduce indoor noise (or control the reverberation time). When designing with plate-type acoustic absorbers, if the total area of the absorbers is equivalent to 30% to 40% of the building's roof area, the acoustic absorption efficiency of the plate-type absorbers can reach the optimal value. In actual projects, to meet the requirements of noise reduction or controlling the reverberation time, the total area of the acoustic absorbers should ideally be 50% to 60% of the building's roof area. Increasing the number of acoustic absorbers may, however, negatively impact the overall acoustic absorption performance of the space, leading to unnecessary financial waste.
Four. Suspension Methods for Sound Absorbing Elements
Acoustic absorbers are usually suspended from the ceiling of building spaces, with most being hung from the top. Panel-type acoustic absorbers can be horizontally or vertically suspended, or both in a combined manner. With the same total area, their noise reduction effect is essentially the same. The hanging height of horizontally suspended panel-type acoustic absorbers is generally around 1/5 to 1/7 of the room's net height. Typically, considering the ease of installation, the acoustic absorbers are hung below the steel frame at the building's ceiling, which is around 1/5 to 1/7 of the room's net height, meeting both acoustic and decorative requirements. If possible, they can be hung lower, closer to the sound source. To enhance the architectural decoration effect of the suspended acoustic absorbers, the form, color, and hanging method should be considered comprehensively. If the acoustic absorbers are hung to create a certain artistic pattern and are coordinated with lighting, ventilation, and architectural decoration, the overall effect will be improved.
Section 5: Applications of Sound Absorbing Spaces
Broadly applicable in indoor gyms, basketball courts, badminton halls, sports facilities, swimming pools, noisy factories, as well as radio and TV stations, recording studios, studios, schools, large theaters, libraries, cultural centers, auditoriums, multipurpose halls, meeting rooms, and concert halls, where high sound quality is required.
