Periodic high frequency vibration noise of computer cases!

1.Bearing sound: When the fan is rotating, the bearing will cause friction, which will produce noise.

Generally, the middle is filled with lubricating oil to avoid direct contact between the bearing and the shaft, so the sound is usually more obvious at low speed, in which the bearing sound of the ball bearing will be more prominent, and the bearing sound control of the oil shaft is better (the lubricating oil is sufficient and no dust enters the bearing), and the oil seal is improved.

Generally, the lubrication effect and tightness will be improved while ensuring the low noise of the oil sealVibration of the fan: The main reason for this is that the mass distribution of the fan blades is uneven, and there is eccentricity between the center of gravity and the axis of rotation, and the rotor will be unbalanced when the rotor rotates due to centrifugal force.

The force generated by the surrounding and the vibration of the bracket will cause the noise of the fan to rise, generally speaking, the higher the fan speed, the dynamic balance.

The higher the requirements of low speed, it is difficult to show, and if this is serious, it will cause vibration throughout the fan if the chassis is plated.

If it is thin, or the screws are not tightened, it will cause the chassis to resonate and the noise will increase. If the fan is vibrating heavily, you can add a soft insulating device, but the best thing to do is to choose a fan with good dynamic balance.

3.Wind sound: Fan blades.

Noise is generated due to the pulsating force of the uneven air flow at the outlet periodically. The uneven distribution of pressure on the fan blades themselves and on the blades.

Noise is also generated when turning. In addition, the pulsation of the pressure distribution on the blades will also produce noise due to the turbulent adhesion plane, vortex and vortex detachment caused by the air flow passing through the fan blades. This is called cutting wind noise in addition to wind pressure.

The larger the fan, the louder the cutting noise will be. Cutting noise rises rapidly as the rpm increases, and it is unavoidable. If you want to be quiet, I personally recommend turning the fan speed a little lower.

If the air volume is too small, you can change to a large fan A large size and low speed fan is quieter than a small size and high speed fan when delivering the same air volume, and the air flow resistance will cause noise. In addition, there is also a high-frequency noise that causes turbulence in the air. All of this requires artificially optimizing the air duct and checking your fan.

It may be that the hard drive has been used for too long, or it is time to wipe the fan and change the fan, or it may be the power supply fan.

It could be an issue with the CPU's cooling fan or the power supply cooling fan.

You go and get someone to change the fan.

Methods of resonance noise reduction in computer cases:

1. The side panels, front and rear panels of the chassis and other parts will resonate due to the rotation of the fan. The easiest way to deal with these resonances is to tighten their mounting screws. If there is still a lot of noise, you can install shock absorbing pads, shock absorbing nails, etc. on the part of the accessory that touches the chassis.

2. The dust accumulated on the air inlet of the power supply, the fan blades and the bearings will also produce a lot of noise. Therefore, it is necessary to clean the power supply regularly, dust and oil the fan bearing, which can also significantly reduce the noise. It is also possible to add shock absorbers to the power supply.

3. CPU and graphics card are the key accessories of the computer, and the supporting radiator is also more important, so they have become one of the sources of noise. You can periodically scrape off the old silicone grease that has hardened where the processor, graphics card and heatsink come into contact and reapply it uniformly, or you can replace it with gray silicone grease with better heat conduction efficiency, or you can switch to a silent heat sink with better heat dissipation.

To eliminate resonance, you have to find the vibration source, the host can become the vibration source is nothing more than the CPU fan (if it is other hardware, then you have to deal with it carefully), there are two solutions, to add oil to the fan, to add it to the rotor, the general sewing machine can have it, or if it is convenient, just change the fan.

The chassis plate is a little thin, and the quality of the power supply is a bit rubbish. If it's these days. It is related to the lubrication of the power supply, the weather is cold, dry, and dust accumulates, it is possible, or the power supply itself is not fixed, the screws are loose, or the power supply is changed.

Either clean and lubricate the power supply.

Of course, there are other ways, but the cost is relatively high, the thickness of the chassis is less than easy to resonate, the easiest way is to quickly change the chassis, go to the computer city to pick a sturdy second-hand empty chassis, generally around 20 yuan-30 yuan. The chassis can't be broken, so it's very affordable to use it. In particular, the iron sheet of the chassis removed from some brand machines is very thick, generally on the left and right, and it is not easy to resonate.

Put some heavy stuff on the chassis, but make sure it's stable under the chassis, and mine just made it work.

The side panels are all removed, it's good, it's basically useless, and there are no children at home.

In order to eliminate the vibration noise of the case, we can pay attention to the hardness of the case and the connection between the case and the cabinet when purchasing a computer. Chassis with materials that are too thin and use too "economically" are not strong. Gently squeeze or twist the box by hand to check whether its hardness is acceptable.

A case with a screw-on lid and body is more stable, while a screw-free case is prone to vibration, so it's best to consider it when buying. In addition, some appropriate shock absorption measures can be taken during installation and use, such as attaching a 3 4 mm thick plastic foam strip to the parts of the box lid that are in direct contact with the box body, and then tightening the box cover.

Hello landlord! Follow these steps:

1. Remove the graphics card and unplug the CPU fan - turn it on. If it's noisy, then it's a power supply fan problem. It could be that you didn't tighten it, or it could be that the fan blade scraped the wire. Otherwise, the power supply will be discharged (the CPU will be turned off after a while, and the CPU will not have a problem);

2. Plug in the CPU fan power supply. If the noise is high, replace the fan or the entire radiator;

3. If the power supply and CPU are excluded, then install the graphics card and try again. If you confirm the heat dissipation problem of the graphics card, then consider repairing the fan or replacing the heatsink (this heatsink may be expensive, it depends on your graphics card, the old graphics card only costs 25 yuan.) Slip of the mold).

That's all! The above are the standard maintenance steps for facing your kind of problem (the maintenance personnel do this, and I have also done repairs).

Our legion: Helping others as the foundation, and meeting members with this group.

Change the CPU fan, or even the heat sink;

Change the power supply of the host.

Resonance phenomenon, reinstall the CPU fan.

The "humming" sound emitted by the power supply, with a low frequency, can be judged to be the noise emitted by the improper operation of the exhaust fan.

1. Verify whether there is a problem with it, you can pat the iron shell a few times, if the noise changes, it is confirmed;

2. If this problem occurs in the new power supply, the quality of the fan is problematic, or the air is too dirty, the dust pollutes the bearing, and the motor vibrates when it rotates. Remove the cleaning bearing, add a drop of sewing machine oil and install the test machine. If the test machine problem remains the same, it is a quality problem;

3. The old power supply that has been used for a long time is mostly due to bearing wear, wear deviation, and the bearing clearance is too large, and after the dust enters, the rotor runs unstable, resulting in large vibration, and the resonance of the chassis, it will naturally be noisy. It is recommended to directly replace the fan with a new one to solve the problem completely;

4. In the power box, the power consumption of electronic devices when working will produce high heat, in order to prevent heat accumulation, exhaust fans are installed in the iron box to cool down. When there is a problem with the fan, the noise is low-frequency noise; When there is a problem with the circuit device

Yes, you can tighten the case screws, or add spring pads to the screws.