The cause of the noise from the cooling fan in the chassis
cooling fans caused resonance phenomenon
chassis structure: the structure of power supply chassis to install system have low natural frequency, fan running speed increasing, when the speed is close to system began to show the natural frequency of resonance phenomenon, with the improvement of fan speed is more and more close to the natural frequency, vibration and increase when the fan speed and natural frequency at the same time, the most violent vibration performance, when the fan speed continues to increase, the fan speed gradually away from the system natural frequency, vibration is weakened gradually returned to normal. ,
fan blades eccentric: high-quality fan on the axis of centre of gravity of the blades, running smoothly, when the noise is small, and the inferior fan, there will be some deviation, the focus of blades without cause eccentricity on the axis, was such a fan of transhipment, vibration will occur with the use, the longer the fan bearing wear loose or fan installation weak will gradually intensified the vibration noise. Wenling city tong chi auto air conditioning manufacturing co. , LTD. , specializing in the production of high quality cooling fans.