[AC cooling fan] the main source of noise
[AC cooling fan] the main source of noise
u003cbru003e 1). Vibration
u003cbru003e If the rotor's physical center of mass and the center of inertia of the shaft are not on the same axis when the rotor of the AC cooling fan rotates, it will cause the rotor to be unbalanced. The shortest distance between the physical center of mass of the rotor and the center of inertia of the shaft is called the eccentricity. The imbalance causes eccentricity.When the rotor of the AC cooling fan rotates, a force is generated on the rotating shaft bracket due to the centrifugal force to form vibration, and the vibration is transmitted to all parts of the machine through the base path.
u003cbru003e 2). AC fan wind noise
u003cbru003eWhen the AC cooling fan works, the blades periodically bear the pulsating force of the uneven airflow at the outlet, which produces noise; on the other hand, due to the uneven distribution of pressure on the blade itself and the blades, the surrounding air and parts The disturbance also constitutes rotating noise; in addition, due to the turbulent attachment layer, vortex and vortex separation generated when the gas flows through the blade, it causes the pulsation of the pressure distribution on the blade to generate car noise.
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