Calculation Method for Maximum Sound Attenuation of Centrifugal Cabinet-Type Fans

Calculation Method for Maximum Sound Attenuation of Centrifugal Cabinet-Type Fans

With the advancement of science and technology and the acceleration of industrialization, a wide variety of scientific and technological products have emerged. Centrifugal cabinet-type fans serve as the power source for flue gas purification and gas transportation, and are indispensable equipment in certain industries. Centrifugal cabinet-type fans belong to the category of induced draft fans, but they are prone to malfunctions during operation. There are many causes of these malfunctions, most of which are related to bearings and blades. If the vibration levels of a centrifugal cabinet-type fan increase, the air ducts and housing may be damaged, and the fan’s noise level will rise. Excessive noise can disrupt normal work and rest, so manufacturers strive to reduce noise levels. To achieve this goal, it is necessary to calculate the maximum noise reduction for the centrifugal cabinet fan. Then, input known parameters such as speed, temperature, average density, blade natural frequency, and blade frequency. Here, the fan frequency is equal to the product of speed and the number of blades divided by 60. The sound power constant k depends on the fan model and operating point. The maximum value is 50. The sound power level of the centrifugal cabinet-type fan is calculated as nk + 10lg(Q1) + 20lg(ptf), with a permissible error of ±4. Based on the calculated data for the centrifugal cabinet-type fan, the results are a frequency of 987.8, a wave number of 17.35, and a noise reduction of 6.458.