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Server fan to reduce noise

IP.com Disclosure Number: IPCOM000200355D
Publication Date: 2010-Oct-08
Document File: 2 page(s) / 98K

Publishing Venue

The IP.com Prior Art Database

Abstract

1.Desktop PC and server cooling fans is essential.   Background: Cooling fan noise has no effect on cooling, but it is very important to the system end user. Audible noise originates from several sources. Aerodynamic noise is a result of turbulence caused by the fan blades. The frequency and magnitude of the noise generated by a cooling fan increases with rotational speed. Mechanical noise can be caused by bearings, or unbalanced rotating elements that can cause vibration. If this vibration is at a frequency that matches any resonant frequencies of the enclosure it can be amplified to an intolerable or even destructive level. The motor can contribute to the noise, but this is a very small part of the total noise generated by the cooling system. In general, obstacles on the intake side of the fan negatively impact the noise level more than on the exhaust side. Lower the RPM of the fan operating speed (this action also lowers airflow)

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Server fan to reduce noise

1.Desktop PC and server cooling fans is essential.  

Background:
Cooling fan noise has no effect on cooling, but it is very important to the system end user. Audible noise originates from several sources. Aerodynamic noise is a result of turbulence caused by the fan blades. The frequency and magnitude of the noise generated by a cooling fan increases with rotational speed. Mechanical noise can be caused by bearings, or unbalanced rotating elements that can cause vibration. If this vibration is at a frequency that matches any resonant frequencies of the enclosure it can be amplified to an intolerable or even destructive level. The motor can contribute to the noise, but this is a very small part of the total noise generated by the cooling system.

In general, obstacles on the intake side of the fan negatively impact the noise level more than on the exhaust side.

Lower the RPM of the fan operating speed (this action also lowers airflow)

Mount the fan on an interior surface on the enclosure rather than on an exterior surface

2.Office and data center Fan noise level be a problem.

As the sound radiates away from the noise source, it may be reflected by walls and other obstacles in its path; it may be partially absorbed by the reflecting surfaces;
it may be partially transmitted through the surfaces it strikes; and it may be scattered by, or diffracted around, the obstacles in its path. All of these are aspects of the transmission of sound,...