Multilayer anechoic chamber is a special type of anechoic chamber designed to provide higher acoustic isolation and lower background noise. The following are some key principles of multi-layer anechoic chamber design:
 
1. Hierarchical structure design
 
Multi layer anechoic chambers are usually composed of multiple sound absorbing layers and sound insulating layers. Each layer has specific functions and design requirements. For example, the innermost layer is usually an efficient sound-absorbing material used to absorb sound waves; The intermediate layer may be a sound insulating material used to block the propagation of sound waves; The outermost layer may be a thick structural material used to provide additional sound insulation.
 
2. Selection of sound-absorbing materials
 
The selection of sound-absorbing materials is an important step in the design of multi-layer soundproof chambers. Commonly used sound absorption materials include glass fiber, slag wool, foam plastics, etc. These materials have good sound absorption properties, which can effectively absorb sound waves and reduce reflected sound.
 
3. Selection of soundproof materials
 
The selection of sound insulation materials is equally important. Common sound insulation materials include thick steel plates, concrete slabs, etc. These materials have a high density and can effectively block the propagation of sound waves, reducing the interference of external noise.
 
4. Structural sealing
 
The structural sealing of multi-layer anechoic chambers has a significant impact on their sound insulation performance. Any slight gap can cause sound leakage, thereby reducing the sound insulation effect. Therefore, when designing and constructing multi-layer soundproof chambers, special attention should be paid to the sealing of the structure to ensure that all joints, doors, windows, and ventilation openings are tightly treated.
 
5. Implementation of Free Sound Field
 
The main function of a multi-layer anechoic chamber is to provide a low-noise testing environment that approximates a free field. To achieve this goal, it is necessary to lay efficient sound-absorbing materials inside the soundproof room, so that sound waves can propagate without reflection. In addition, it is necessary to ensure that the size of the soundproof chamber is large enough to obtain accurate results during the testing process.
 
6. Ventilation and air conditioning system
 
Ventilation and air conditioning systems are important components in the design of multi-layer soundproof rooms. Traditional ventilation and air conditioning systems may introduce external noise, which can affect the accuracy of test results. Therefore, when designing multi-layer soundproof rooms, special attention should be paid to optimizing the ventilation and air conditioning systems. For example, soundproof ducts, mufflers, and other equipment can be used to reduce the noise caused by ventilation and air conditioning systems.
 
In summary, the design of multi-layer soundproof rooms requires comprehensive consideration of multiple factors such as sound-absorbing materials, sound insulation materials, structural sealing, implementation of free sound field, and ventilation and air conditioning systems. Through reasonable design and optimization, the acoustic performance of multi-layer anechoic chambers can be effectively improved, thereby meeting the needs of various high-precision acoustic tests.