'Hard to tell the male female' car ac fan noise with different sound how to recognize! ！
noise: because the blade periodically under the export and the pulse power of uneven air, noise; On the other hand, due to the blade itself and uneven distribution of blade pressure on, turns on the surrounding gas and noise disturbance also constitute parts of rotation; In addition due to gas flows through the blade to tear, vortex and vortex flow attached level from, cause the pulsation of the pressure distribution on blade and motor noise generation. The same series of fan, air volume supplied by wind pressure, noise is bigger also, therefore, to choose the fan form, too much allowance not only waste of energy, and increase the noise. To the same type of fan, should as far as possible choose low speed running fan; For different type of fan, should choose low noise, not only consider the speed. For some users, only the pursuit of air volume and air pressure requires speed, the higher the better, of course, the noise value can be relaxed; For the system to work, we always suggest to choose it is advisable to meet the demand of heat dissipation of low noise, the lower the better.
different sound: sounds only pure wind noise, noise is a kind of sound waves, all properties of sound waves. Vary the sound is different, when the fan operation, in addition to the wind, if there are other sound ( With two or more of the voice) , can judge the fan in the sound. Different tone may be due to the deformation of bearing or foreign body in it, and improper assembly and a collision, or uneven motor winding coil, create loose, can have different sounds, this fan is belong to wash out. General detection method of different sounds are used to listening to the sounds, the subjective factor is bigger, not easy to identify, easy to dispute, if you use a larger number of fan, but with the aid of spectrum analysis equipment to check the noise spectrum energy distribution to recognize the different sound.
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