TY  - EJOU
AU  - Jie, Haoxiang  
AU  - Shi, Huihong  
AU  - Ding, Jianwan  
AU  - Wu, Yizhong  
AU  - Yin, Qian  

TI  - A Metamodel-Based Global Algorithm for Mixed-Integer Nonlinear Optimization and the Application in Fuel Cell Vehicle Design
T2  - Computer Modeling in Engineering \& Sciences

PY  - 2015
VL  - 108
IS  - 3
SN  - 1526-1506

AB  - This paper improves the adaptive metamodel-based global algorithm (AMGO), which is presented for unconstrained continuous problems, to solve mixed-integer nonlinear optimization involving black-box and expensive functions. The new proposed method is called as METADIR, which can be divided into two stages. In the first stage, the METADIR adopts extended DIRECT method to constantly subdivide the design space and identify the sub-region that may contain the optimal value. When iterative points gather into a sub-region to some extent, we terminate the search progress of DIRECT and turn to the next stage. In the second phase, a local metamodel is constructed in this potential optimal sub-region, and then an auxiliary optimization problem extended from AMGO is established based on the local metamodel to obtain the iterative points, which are then applied to update the metamodel adaptively. To show the performance of METADIR on both continuous and mixed-integer problems, numerical tests are presented on both kinds of problems. The METADIR method is compared with the original DIRECT on continuous problems, and compared with SO-MI and GA on mixed-integer problems. Test results show that the proposed method has better accuracy and needs less function evaluations. Finally, the new proposed method is applied into the component size optimization problem of fuel cell vehicle and achieves satisfied results.
KW  - Metamodel
KW  -  Black-box function
KW  -  Mixed-integer nonlinear optimization
KW  -  Fuel cell vehicle

DO  - 10.3970/cmes.2015.108.193