Research Papers

Computational Fluid Dynamics Assisted Control System Design With Applications to Central Processing Unit Chip Cooling

[+] Author and Article Information
R. Zhang

e-mail: rzhang8@uwo.ca

C. Zhang

e-mail: czhang@eng.uwo.ca
Department of Mechanical
and Materials Engineering,
The University of Western Ontario,
London, ON N6A 5B9, Canada

J. Jiang

Department of Electrical
and Computer Engineering,
The University of Western Ontario,
London, ON N6A 5B9, Canada
e-mail: jjiang@eng.uwo.ca

1Corresponding author.

Manuscript received October 29, 2012; final manuscript received April 17, 2013; published online October 3, 2013. Assoc. Editor: Mehmet Arik.

J. Thermal Sci. Eng. Appl 5(4), 041010 (Oct 03, 2013) (7 pages) Paper No: TSEA-12-1190; doi: 10.1115/1.4024702 History: Received October 29, 2012; Revised April 17, 2013

In this paper, a computational fluid dynamics (CFD) assisted control system design methodology has been described in detail. The entire design and evaluation procedure has been illustrated through a feedback control system synthesis for a central processing unit (CPU) chip cooling system. The design methodology starts with a full-scale CFD simulation of the nonlinear dynamic process to generate the input and output databases of the process. Using this data set, linear dynamic models around specified operating points are obtained using system identification techniques. Based on these models, one can design appropriate control systems to meet the required closed-loop control system specifications. To illustrate the effectiveness of this technique, it has been used to design a controller for a PC chip cooling system. In particular, the coupling issues between ‘real-time’ dynamic controllers with non real-time CFD simulation have been resolved. A physical experimental test bench based on a cooling system of a Pentium III CPU has been constructed. The feedback linear control systems designed by the proposed CFD approach have been evaluated experimentally for six CPU load conditions.

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Fig. 1

Philosophy of CFD assisted control system design

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Fig. 2

Configuration of the chip cooling system

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Fig. 3

Block diagram representation of the chip cooling system

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Fig. 4

Open-loop step responses of Tc with respect to a change in fan motor voltage

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Fig. 5

Open-loop step response of Tc with respect to a change in the heat load

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Fig. 6

Architecture of the closed-loop control system

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Fig. 7

Predicted heat load fluctuation for performance evaluation

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Fig. 8

Performance of the chip cooling system evaluated using CFD simulations and physical experiments

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Fig. 9

Typical commercial chip cooling control logic




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