News Center

[Do You Know About Cooling?] Distinguishing Between Noise and Unusual Sounds from Cooling Fans

Category:

Industry Trends

Release time:

2019-08-20

Cooling fan Noise from the cooling fan arises from two main sources: First, the blades periodically experience pulsating forces caused by the non-uniform airflow at the outlet, which generates noise. Second, due to the uneven distribution of pressure both on the blades themselves and across their surfaces, the rotation of the blades disturbs the surrounding air and adjacent components, contributing to rotational noise. Additionally, as gas flows over the blades, it creates boundary layers, vortices, and vortex shedding, leading to fluctuations in the pressure distribution on the blade surface and thus generating vortex noise.
For fans in the same series, those with higher airflow and higher static pressure tend to generate more noise. Therefore, it’s important to select the appropriate fan type wisely—excessively large margins not only waste energy but also increase noise levels. For fans of the same model, you should, whenever possible, choose those that operate at lower speeds. When comparing fans of different models, prioritize those with lower noise levels rather than focusing solely on rotational speed. For some users who are primarily concerned with maximizing airflow and static pressure, a higher rotational speed is naturally preferable, even if it means tolerating slightly higher noise levels. However, from a system-performance perspective, we consistently recommend selecting fans that meet cooling requirements while maintaining low noise levels—ideally, the quieter the better. As for cooling fans, the noise they produce typically sounds like nothing more than the pure sound of air flowing. Noise, after all, is simply a type of sound wave possessing all the characteristics inherent to sound waves.
Unusual noises from cooling fans: When a fan is running, if it emits sounds other than the usual airflow noise—specifically, two or more distinct sounds—it can be determined that the fan is producing abnormal noises. These unusual noises may be caused by foreign objects or deformation inside the bearing, improper assembly leading to collisions, or uneven winding of the motor windings that results in loose connections. Fans exhibiting such abnormalities should be considered obsolete and phased out.
Method for detecting noise and abnormal sounds from cooling fans: Typically, detecting abnormal sounds involves listening closely with the ear, which is highly subjective, makes identification difficult, and can easily lead to disputes. If you’re using a large number of fans, you can use spectrum analysis equipment to examine the spectral energy distribution of the noise, thereby identifying abnormal sounds more reliably.
 
The above is a brief sharing of insights on distinguishing between noise and abnormal sounds in cooling fans. Shenzhen Jiangshanlai Electronic Technology Co., Ltd. is a large-scale enterprise integrating customization, R&D, manufacturing, sales, and service of DC brushless motors, DC cooling fans, DC brushless fans, DC stand fans, boosted cooling fans, miniature cooling fans, DC cooling fans, DC blowers, and non-standard fans. We are a wholesale manufacturer and supplier of DC fans. Our products are best-selling in Guangdong Province—particularly in Shenzhen, Guangzhou, Dongguan—as well as in Fujian, Zhejiang, and Jiangsu provinces.
If you have any needs, feel free to consult us.

Previous: [Did You Know About Cooling?] What are the maintenance methods for cooling fans?

Next: [Thermal Management Know-How] Precautions for Installing and Wiring Cooling Fans

Related News

Company dinner

Company dinner

On these busy days, I’m grateful to have you all fighting side by side! At this company dinner, everyone can put aside their daily hustle and enjoy some wonderful moments together. Let’s raise our glasses and chat freely—may delicious food and laughter accompany us as we strengthen our team spirit and build an even warmer sense of unity!

2025-08-27

Weekend team-building event

Weekend team-building event

The weekend team-building event by the seaside came to a perfect close! With sunny beaches and endless laughter, the team collaborated seamlessly in fun-filled games, relaxing their minds and bodies amid the soothing sound of ocean waves. Filled with renewed energy, we’re ready to join hands and tackle new challenges together!

2025-08-25

Display cabinet

Display cabinet

The newly installed display cabinets at the Huizhou company are gradually being filled up...

2025-08-21

Jiangshan Lai Electronics wishes you a happy Mid-Autumn Festival 2022!

Jiangshan Lai Electronics wishes you a happy Mid-Autumn Festival 2022!

On a day of blooming flowers and a full moon, When families are reunited in joy, May our land send you warm wishes for a happy Mid-Autumn Festival!

2022-09-10

Jiangshan wishes you a healthy and happy Dragon Boat Festival 2022!

Jiangshan wishes you a healthy and happy Dragon Boat Festival 2022!

The fragrant aroma of zong leaves fills the air on May 5th— May our heartfelt wishes bring you peace and well-being this Dragon Boat Festival! May our land send its best wishes for your health and happiness this Dragon Boat Festival 2022!

2022-06-03

May the land and rivers bring you joy as we celebrate Labor Day!

May the land and rivers bring you joy as we celebrate Labor Day!

Salute to the workers! May our country and its people bring joy and happiness to all our customers and employees on this special occasion!

2022-05-01

The Knowledge Principles and Internal Structure of DC Brushless Cooling Fans

The Knowledge Principles and Internal Structure of DC Brushless Cooling Fans

2022-04-25

Advantages and Applications of Oil-Bearing DC Fans

Advantages and Applications of Oil-Bearing DC Fans

The pivot joint is fixed at the position of the motor stator base, ensuring an appropriate gap between the rotor and the stator. Of course, there must also be a clearance between the shaft core and the bearings to prevent the shaft core from becoming locked and thus unable to function. The stator structure of the motor—hereafter referred to as the "stator"—is designed in such a way that, once power is supplied, an induced magnetic field will be generated between the rotor and the stator. The control circuit then drives the electric fan motor into operation. Therefore, in the conventional fan motor design, as long as the fan rotor, the motor stator, and the drive circuit work together via the pivot joint between the shaft core and the bearings and through magnetic field induction, the motor can operate effectively.

2022-04-18