Active control of centrifugal fan noise: Modeling design guidelines.

Abstract

Information technology (IT) noise is very prevalent in today’s society. Active noise control (ANC) has shown promise in minimizing the effect of fan-induced IT noise on users. Much of the previous research has concentrated on axial cooling fans, such as those found in desktops and servers. This approach was based on the concept of minimizing radiated acoustic power in a model of the fan radiation, and using those results to determine appropriate nearfield locations for the error sensor(s). This paper describes modifications to this previous method to develop a modeling approach to implement active noise control with a centrifugal blower, such as those found in fan trays and laptop computers. This model has been used to predict tonal noise inside and outside the duct, as well as how to best develop an ANC system for such an idealized setup. Differences between the axial fan model and the centrifugal blower model are discussed, as well as some limiting assumptions for each model.

Experimental investigations on the performance and noise characteristics of a forward-curved fan with the stepped tongue

“…9–12 However, it is more important to analyze and verify the optimal design products through experiments to achieve better performance and noise control. 13–15…”

“…[9][10][11][12] However, it is more important to analyze and verify the optimal design products through experiments to achieve better performance and noise control. [13][14][15] Cau et al 16 argued that a severely distorted primary flow with early flow separation on the suction side at both low and design flow rates occurs due to the poor 1 State-Province Joint Engineering Lab of Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou, China 2 design of the flow channel in these fans. Zhang et al 17 conducted an experimental study on a centrifugal fan by a half vane diffuser which can improve fan performance and reduce noise.…”