Cooling fanNoise: The cooling fan generates noise because the blades are periodically subjected to the pulsating force of the uneven airflow at the outlet; on the other hand, due to the uneven distribution of pressure on the blades themselves and the blades, the disturbance to the surrounding gas and parts during rotation also constitutes Rotational noise; in addition, the turbulence attached layer, vortex and vortex separation are generated due to the pulsation of the pressure distribution on the blades and vortex noise are generated.
The same series of fans, the wind pressure is large, the noise is also large, therefore, to a reasonable choice of fan form, the margin is too large not only waste electricity, but also increase the noise. For the same type of fan, should try to use low speed running fan; for different types of fan, should choose the lower noise, and should not only consider the speed. For some users, only the pursuit of air volume and air pressure, of course, requires that the higher the speed, the better, and the noise value can be relaxed; for system work, we have always recommended to choose low noise to meet the heat dissipation requirements, the lower the better. Cooling fan cooling fan noise sounds only pure wind, noise is a kind of sound wave, with all the characteristics of sound waves.
The noise of the cooling fan: when the fan is running, in addition to the wind, if there are other sounds (with more than two sounds), you can judge that the fan has a noise. Abnormal sound may be caused by foreign matter or deformation in the bearing, collision due to improper assembly, or looseness caused by uneven winding of the motor winding, which may produce abnormal sound. This fan is among the eliminated.
Detection method of noise and abnormal sound of cooling fan: generally, abnormal sound is detected by listening to the ear. subjective factors are large, which is not easy to identify and is easy to dispute. if you use a large number of fans, you can use spectrum analysis equipment to check the noise spectrum energy distribution to identify abnormal sound.
The above is the use of cooling fan noise and noise difference judgment small knowledge sharing. Shenzhen Jiangshanlai Electronic Technology Co., Ltd. is a large-scale enterprise specializing in the customization, research and development, manufacturing, sales and service of DC brushless motors, DC cooling fans, DC brushless fans, DC bracket fans, pressurized cooling fans, micro cooling fans, DC blowers, and non-standard fans, DC fan wholesale manufacturers and DC fan suppliers. Products sell well in Guangdong, Shenzhen, Guangzhou, Dongguan, Fujian, Zhejiang, Jiangsu and other places.
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