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Development of a Material Mixing Method for Topology Optimization of PCB Substrate  

Han, Seog-Young (한양대학교 기계공학부)
Kim, Min-Sue (한양대학교 일반대학원 기계공학과)
Hwang, Joon-Sung (한양대학교 일반대학원 기계공학과)
Choi, Sang-Hyuk (한양대학교 일반대학원 기계공학과)
Park, Jae-Yong (한양대학교 일반대학원 기계공학과)
Lee, Byung-Ju (한양대학교 전자컴퓨터공학부)
Publication Information
Transactions of the Korean Society of Machine Tool Engineers / v.16, no.1, 2007 , pp. 47-52 More about this Journal
Abstract
A material mixing method to obtain an optimal topology for a structure in a thermal environment was suggested. This method is based on Evolutionary Structural Optimization(ESO). The proposed material mixing method extends the ESO method to a mixing several materials for a structure in the multicriteria optimization of thermal flux and thermal stress. To do this, the multiobjective optimization technique was implemented. The overall efficiency of material usage was measured in terms of the combination of thermal stress levels and heat flux densities by using a combination strategy with weighting factors. Also, a smoothing scheme was implemented to suppress the checkerboard pattern in the procedure of topology optimization. It is concluded that ESO method with a smoothing scheme is effectively applied to topology optimization. Optimal topologies having multiple thermal criteria for a printed circuit board(PCB) substrate were presented to illustrate validity of the suggested material mixing method. It was found that the suggested method works very well for the multicriteria topology optimization.
Keywords
Material mixing method; Topology optimization; Multiple thermal criteria; Printed circuit board(PCB) substrate;
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