【 Auto cooling fan 】 Give you create xanadu
in addition to the heat dissipation effect, fan noise is also a widely concerned problem. Fan noise is the size of the automobile cooling fan is working to produce noise, affected by various factors, the unit is decibels ( dB) 。 When measuring the noise of the fan needs in the sound attenuation of noise is less than 17 db and fan, one meter distance along the direction of the fan rotor on the fan air inlet, measured using A weighted way. The fan noise spectrum characteristics is also very important, so you also need to use spectrometer to record the noise of the fan frequency distribution, generally requires little as far as possible, the noise of the fan and cannot exist different sounds. Fan noise is related to the friction, air flow. Fan speed is higher, the air volume, the greater the noise caused by the will, the greater the other factors of the vibration of the fan itself is also cannot be ignored. Of course the high quality of fan vibration will be small, but the two in front of the person is difficult to overcome. To solve this problem, we can try to use the size bigger fan. Should be under the condition of the same volume, big fan work at low speed when the noise is smaller than small fan noise at high speed work. Another we easy to overlook the factor is the fan bearing. Because of the high-speed fan rotates to the friction between shaft and bearing collision, so also is one of the main fan noise source.
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