How is the noise from the cooling fan generated? 1. The fluid noise of the Cooling Fan, the wind shear noise, the turbulent air flow, the collision and disturbance of the air, the friction with the objects around, the separation of the blade from the air flow, the impulse force of the periodic air supply, etc. . Yeah, it makes a lot of noise. The faster the wind speed, the greater the turbulence, the greater the wind noise, the acceleration will increase with the increase of wind speed. The normal axial flow fan will generate a return sweep flow at the gap between the Fan Blade and the external frame, which will not only produce high wind noise, but also have a negative impact on the air flow. As a result, improved designs such as Flange folding and side air intakes have emerged. 2. Motor noise: Electromagnetic Noise 3. MECHANICAL NOISE A: bearing noise B: Vibration noise generally speaking, Fan blades made of plastic have a certain toughness, can withstand certain physical deformation, and in the process of pushing air due to force and vibration But the amplitude is usually small. Another serious vibration is caused by the uneven mass distribution of the fan blades and the eccentric distance from the rotating shaft.

http://www.dxymotors.com