Abstract
The current research of the decomposition methods of complex optimization model is mostly based on the principle of disciplines, problems or components. However, numerous coupling variables will appear among the sub-models decomposed, thereby make the efficiency of decomposed optimization low and the effect poor. Though some collaborative optimization methods are proposed to process the coupling variables, there lacks the original strategy planning to reduce the coupling degree among the decomposed sub-models when we start decomposing a complex optimization model. Therefore, this paper proposes a decomposition method based on the global sensitivity information. In this method, the complex optimization model is decomposed based on the principle of minimizing the sensitivity sum between the design functions and design variables among different sub-models. The design functions and design variables, which are sensitive to each other, will be assigned to the same sub-models as much as possible to reduce the impacts to other sub-models caused by the changing of coupling variables in one sub-model. Two different collaborative optimization models of a gear reducer are built up separately in the multidisciplinary design optimization software iSIGHT, the optimized results turned out that the decomposition method proposed in this paper has less analysis times and increases the computational efficiency by 29.6%. This new decomposition method is also successfully applied in the complex optimization problem of hydraulic excavator working devices, which shows the proposed research can reduce the mutual coupling degree between sub-models. This research proposes a decomposition method based on the global sensitivity information, which makes the linkages least among sub-models after decomposition, and provides reference for decomposing complex optimization models and has practical engineering significance.
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Supported by National Natural Science Foundation of China (Grant No. 51075356), and National Key Technology R&D Program (Grant No. 2013BAF07B04)
QIU Qingying, born in 1970, is currently an associate professor at Zhejiang University, China. His research interests include innovative design and optimization design.
LI Bing, born in 1984, is currently a PhD candidate at Zhejiang University, China. His research interests include multidisciplinary design optimization.
FENG Peien, born in 1943, is currently a professor and a PhD candidate supervisor at Zhejiang University, China. His research interests include mechanical design theory and methodology.
GAO Yu, born in 1973, is currently a lab technician at Zhejiang University, China. His research interests include construction machinery intelligent control and energy-saving.
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Qiu, Q., Li, B., Feng, P. et al. Decomposition method of complex optimization model based on global sensitivity analysis. Chin. J. Mech. Eng. 27, 722–729 (2014). https://doi.org/10.3901/CJME.2014.0516.096
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DOI: https://doi.org/10.3901/CJME.2014.0516.096