1. System Impedance (System Impedance)
The range between the air inlet and the air outlet of a chassis accounts for 60% to 80% of the total system impedance. In addition, the greater the airflow, the higher the noise. The higher the system impedance, the greater the airflow required for cooling, so in order to minimize noise, the system impedance must be minimized.
2. Airflow disturbance
The turbulence caused by obstacles encountered along the airflow path can generate noise. Therefore, any obstructions, especially in the critical air inlet and outlet areas, must be avoided to reduce noise.
3. Fan speed and size
Because high-speed fans produce more noise than low-speed fans, you should try and choose low-speed fans as much as possible. A fan with a larger size and lower speed is usually quieter than a fan with a lower size and high speed when delivering the same amount of air.
4. Temperature rise
In a system, the air volume required for cooling is inversely proportional to the allowable temperature rise. Allowing the temperature rise to be slightly increased can greatly reduce the amount of air required. Therefore, if the restrictions imposed on the allowable temperature rise are slightly relaxed, the required air volume will be reduced and the noise will be reduced.
5. vibration
In some cases, when the weight of the entire system is very light, or the system must be operated in a specified manner, it is particularly recommended to use soft insulation equipment to avoid the transmission of fan vibration.
6. Voltage fluctuation
Voltage fluctuations will affect the noise level. The higher the voltage applied to the fan, the higher the speed, the greater the vibration and the greater the noise.
7. Design considerations
Each part of the fan is designed