Introduction of some related knowledge about cooling fan noise

June 11 , 2021


How to measure the noise of cooling fan? What are the main factors related to the noise generated by cooling fans? How should we reduce the noise of cooling fans?


1、How to measure the noise of cooling fan?

Noise is the sound level generated by the cooling fan during operation, and its unit is decibel (dB).

Quiet cooling fan, when measuring the noise of the cooling fan, it needs to be carried out in a Anechoic Chamber with noise less than 17dB, one meter away from the fan, and aligned with the air inlet of the fan along the direction of the rotating shaft of the cooling fan.

The spectral characteristics of the noise of the cooling fan are also very important, so it is necessary to record the noise frequency distribution of the cooling fan with a spectrometer. Generally, it is required that the noise of the cooling fan should be small and there should be no abnormal sound.


Anechoic Chamber


2、What are the main factors related to the noise generated by cooling fans?

The noise of high speed exhaust fan is related to friction and air flow. The higher the rotating speed and the larger the air volume of the cooling fan, the greater the noise will be.

In addition, if the fan bearing lacks lubricating oil or has too much dust, it will also cause fan noise, which needs to be maintained and cleaned in time, so as not to damage the hardware equipment due to blocked cooling.


3、How should we reduce the noise of cooling fans?

To solve this problem, we can try to use larger cooling fans. Under the condition of the same air volume, the working noise of the fan with large size at lower speed is smaller than that of the fan with small size at higher speed.

Another factor that we easily overlook is the bearing of the cooling fan.

Brushless motor fan, because the rotating shaft and bearing collide with each other when the cooling fan rotates at high speed, it is also a main source of noise of the cooling fan.




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