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Principles to reduce the noise of cooling fans

by:TOCH     2021-02-26
We have already mentioned that the cooling fan will have a certain amount of noise, as long as it is within a reasonable noise range, it will not affect the normal use of the fan. But what if the normal noise is exceeded? Today Tongchi will tell you how to reduce the noise of the cooling fan in principle. u003cbru003e u003cbru003e u003cbru003e u003cbru003e u003cbru003e u003cbru003e Noise reduction method one: system impedance u003cbru003e u003cbru003e u003cbru003e The range between the air inlet and outlet of a chassis accounts for 60% to 80% of the total system impedance. In addition, the greater the airflow, the higher the noise of the cooling fan. The higher the system impedance, the greater the airflow required for cooling, so in order to minimize noise, the system impedance must be minimized. u003cbru003e u003cbru003e u003cbru003e Noise reduction method 2: Air flow disturbance u003cbru003e u003cbru003e u003cbru003e The turbulence caused by the obstacles encountered along the air flow path will cause noise. Therefore, any obstruction to the cooling fan, especially in the critical air inlet and outlet range, must be avoided to reduce noise. u003cbru003e u003cbru003e u003cbru003e Noise reduction method three: fan size u003cbru003e u003cbru003e u003cbru003e Since high-speed fans produce more noise than low-speed fans, you should try and choose low-speed fans as much as possible. A fan with a larger size and a lower speed is usually quieter than a fan with a smaller size and a higher speed when delivering the same air volume. u003cbru003e u003cbru003e u003cbru003e Noise reduction method 4: temperature rise u003cbru003e u003cbru003e u003cbru003e In a system, the air volume required for cooling is inversely proportional to the allowable temperature rise. The fan allows a slight increase in temperature rise, which can greatly reduce the required air volume. Therefore, if the restrictions imposed on the allowable temperature rise are slightly relaxed, the required air volume will be reduced and the noise will also be reduced. u003cbru003e u003cbru003e u003cbru003e Noise Reduction Method 4: Isolate Vibration u003cbru003e u003cbru003e u003cbru003e In some cases, when the weight of the entire system is very light, or the system must operate in a certain manner, it is particularly recommended to use soft insulation equipment to avoid the transmission of fan vibration. u003cbru003e u003cbru003e u003cbru003e Noise reduction method five: voltage fluctuation u003cbru003e u003cbru003e u003cbru003e Voltage fluctuations will affect the noise level. The higher the voltage of the fan, the greater the vibration and the greater the noise due to the increase in speed. Therefore, if the air volume is available, try to choose a fan with a lower voltage. u003cbru003e u003cbru003e u003cbru003e u003cbru003e u003cbru003e u003cbru003e When your fan is noisy, try the above methods. The AC cooling fan and the DC cooling fan are the same. As long as the method is used for your fan, the noise can reach the normal level.
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