Browse Prior Art Database

Reducing Acoustical Noise in Cooling Fans

IP.com Disclosure Number: IPCOM000110761D
Original Publication Date: 1994-Jan-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Benck, JW: AUTHOR [+4]

Abstract

Described is a hardware implementation to reduce acoustical noise in cooling fans, as used in personal computers. The implementation concentrates on the orientation of the fan support studs to reduce fan noise.

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Reducing Acoustical Noise in Cooling Fans

      Described is a hardware implementation to reduce acoustical
noise in cooling fans, as used in personal computers.  The
implementation concentrates on the orientation of the fan support
studs to reduce fan noise.

      Typically, cooling fans are placed within the power supply of a
personal computer since it is considered to be the most convenient
position from an assembly and cooling standpoint.  However, from an
acoustical point of view, this may not be the most advantageous
position.

      Generally, the center hub of a typical axial-flow cooling fan
is held in place by several support studs.  One of the studs is wider
than the others and is used for the purpose of allowing the fan
voltage leads to exit from the center hub.  Although this added stud
width may appear to have an insignificant affect on the fan's
performance, it has been found that the additional added stud width
can have a distinct affect on the acoustical noise of the fan due to
the air flow passing over the wide stud.

      The concept described herein focuses on the wide stud and its
position in relation to the fan's air-flow output.  It has been found
that the acoustic noise of the fan can be reduced significantly by
repositioning the wide stud to one of the other possible positions,
as a typical fan will utilize four mounting studs.