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Server aerodynamic noise and noise reduction design simulation study

Author: ZhangZuo
Tutor: DuPingAn
School: University of Electronic Science and Technology
Course: Mechanical Manufacturing and Automation
Keywords: server aerodynamic noise numerical simulation noise reduction design
CLC: TP368.5
Type: Master's thesis
Year: 2011
Downloads: 61
Quote: 2
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Abstract


The server is one of commonly-used electronic devices, because of running 24 hours a day, the cooling becomes a prominent problem in structural design. The air-cooled form is usually used for server’s cooling, but this will cause louder aerodynamic noise while the high-speed blades force the air to run away. With the enhanced awareness of environmental protection, the noise problems can not be neglected. In this paper, taking the rack-mounted server as a researching example, the means of aerodynamic noise simulation and the noise reduction design is investigated by using CFD methods and combining with the noise tests, in order to grasp the numerical calculation and the modeling method of electronic devices on aerodynamic noise, and to provide basic rules for the noise prediction and reduction design.Three following aspects are discussed in this paper.(1) Research on aerodynamic noise simulation of the serverFirst, a brief introduction related to the basics of acoustic theory is stated, including the brief history of aeroacoustics, the basic concepts of acoustics and the acoustic wave equation. Second, research on aerodynamic noise simulation of the server is studied on two aspects: how to simplify the model and choose suitable turbulent model; simplifying the model is intended to make modeling and meshing easily, to increase the quality of meshes, in order to improve the efficiency of numerical simulation work; comparing the calculating results of RNG k-ε, LES, RSM and DES four turbulent models, finally the RNG k-εmodel is chosen as the best choice both in high simulation accuracy and computational efficiency.(2) Numerical simulation on aerodynamic noise of the serverFirst, a brief introduction about the simulation software GAMBIT and FLUENT is elaborated, and the general process of aerodynamic simulation is overviewed; second, taking IBM X 3650 2U server as a researching example, the geometric modeling, meshing and boundary conditions are described in detail, and the steady flow field and the transient flow field coupled with aerodynamic noise are calculated separately. Third, noise tests of the server are done and the simulation error is controlled below 10%. (3) Research on noise reduction design of the serverFirst, an overview on commonly-used noise control method of the server is stated, and the structural parameters on server noise reduction design are studied in this paper. Second, the cooling fans, wind channel resistance elements and cooling holes are investigated in how to influence the aerodynamic noise. Third, in the process of server structural design, choosing a smaller absolute value of the negative vortex flow index, suitable size and location of the flow resistance, appropriate porosity and holes’position on the server’s shell, can effectively reduce the noise.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Micro-computer > A variety of micro-computer > Servers, workstations
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