When the Chassis Fan noise gets louder, it may be caused by a variety of factors.
First, the mechanical parts of the Chassis Fan are one of the common reasons. As the use time increases, the bearings of the Chassis Fan may wear out. For example, after a long period of operation, the lubricating oil of the oil-bearing Chassis Fan will gradually decrease, resulting in increased friction between the bearings. This friction will produce abnormal vibration and noise, and the frequency and intensity of the noise may increase with the increase of the Chassis Fan speed. The ball bearing Chassis Fan may also experience ball wear and deformation, which will also cause the noise to become louder.
Secondly, the accumulation of dust on the Chassis Fan blades is also an important factor. During the use of the chassis, the Chassis Fan will continuously inhale the surrounding air, and dust can easily adhere to the surface of the blades. When there is a lot of dust accumulation, it will destroy the original aerodynamic characteristics of the blades. When the Chassis Fan rotates, due to the uneven distribution of dust, the blades will be unevenly stressed, resulting in vibration and noise. Moreover, dust may also enter the internal parts such as the bearings of the Chassis Fan, further exacerbating friction and making the noise problem more serious.
In addition, the installation problem of the chassis fan may also cause the noise to increase. If the chassis fan is not firmly installed on the chassis and there is a loose phenomenon, additional vibration will be generated when the chassis fan is running. This vibration will be transmitted through the chassis and amplify the noise. For example, if the mounting screws are not tightened or the mounting holes are not matched, the chassis fan cannot be fixed on the chassis smoothly, which will cause noise.
Abnormal changes in the chassis fan speed will also increase the noise. It may be because of the problem of the computer's BIOS settings or software control that the chassis fan is always in a high speed state. At high speed, the noise of the chassis fan itself will be significantly greater than at low speed. It may also be that the hardware temperature is too high, and the motherboard's intelligent temperature control system forces the chassis fan to run at high speed to dissipate heat, thereby generating a large noise.
Finally, the resonance phenomenon inside the chassis may also be the reason for the increase in noise. Resonance occurs when the vibration frequency of the chassis fan is close to or the same as the natural frequency of the chassis. Resonance will greatly increase the loudness of the noise, and this noise is usually low and thick, which will bring a very bad user experience.
