HP INCFollow

Abstract

In recent years, laptop fan blade density is increased continually to provide higher

pressure capability which could be used to overcome high system impedance inside a

slim laptop system. This dense design pushes the acoustic energy emission toward to

high frequency range. Typically, a laptop fan is designed with uniform blade thickness

and uniform blade-to-blade interval distance, which generates period flow pattern

when fan is operating. This periodic flow filed characters and high frequency acoustic

energy emission leads to annoying high pitch noise and impact customers’ experience.

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