The factors that affect the sound absorption effect of the anechoic chamber mainly include the following aspects:
 
1. Sound absorbing materials
-Type and quality: Choosing the appropriate sound-absorbing material is crucial, such as glass fiber cotton board, polyester fiber board, etc. The sound absorption performance of materials depends on their density, fiber fineness, and structural characteristics.
-Sound absorption coefficient: The sound absorption coefficient of sound-absorbing materials should be sufficiently high, generally requiring a minimum of 0.99 above the cutoff frequency to ensure effective absorption of sound waves.
 
2. Installation method of materials
-Laying density: The laying density of sound-absorbing materials affects the sound absorption effect. For example, when the density of glass fiber cotton board is between 85-105, the sound absorption effect is better.
-Sharp splitting structure: The sharp splitting structure can guide sound waves to penetrate deep into the material, improving sound absorption efficiency.
 
3. Interior Space Design
-Space size: The size and shape of a room can affect the propagation path and reflection of sound waves. Ideally, the anechoic chamber should be designed as a rectangle or square to avoid excessive corner reflections.
-Structural integrity: The structure of the soundproof chamber should be kept intact, avoiding gaps and voids that may cause sound wave leakage.
 
4. Environmental factors
-Temperature and humidity: Changes in temperature and humidity can affect the speed of sound and air viscosity, thereby affecting the performance of sound-absorbing materials. Generally speaking, an increase in temperature may cause the sound absorption performance to shift towards higher frequencies.
-Airflow: The airflow inside ventilation ducts and mufflers may affect the stability and sound absorption effect of sound-absorbing materials.
 
5. Sound insulation and vibration reduction
-Soundproof wall: The walls of the soundproof room should be made of efficient soundproof materials to reduce the intrusion of external noise.
-Vibration reduction treatment: The vibration reduction treatment of the ground and walls can effectively reduce the transmission of vibration to the interior, affecting the sound absorption effect.
 
In summary, the sound absorption effect of an anechoic chamber is influenced by various factors, and these factors need to be comprehensively considered in design to ensure the expected acoustic control effect is achieved.