Surrogate Model Optimizations for Protective Effects of Railway Wind Barriers

XIANG Huoyue; LI Yongle; SU Yang; LIAO Haili

doi:10.3969/j.issn.0258-2724.2016.06.008

Volume 29 Issue 6

Nov. 2016

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Journal of Southwest Jiaotong University > 2016 > 29(6): 1098-1104.

XIANG Huoyue, LI Yongle, SU Yang, LIAO Haili. Surrogate Model Optimizations for Protective Effects of Railway Wind Barriers[J]. Journal of Southwest Jiaotong University, 2016, 29(6): 1098-1104. doi: 10.3969/j.issn.0258-2724.2016.06.008

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XIANG Huoyue, LI Yongle, SU Yang, LIAO Haili. Surrogate Model Optimizations for Protective Effects of Railway Wind Barriers[J]. Journal of Southwest Jiaotong University, 2016, 29(6): 1098-1104. doi: 10.3969/j.issn.0258-2724.2016.06.008

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Surrogate Model Optimizations for Protective Effects of Railway Wind Barriers

doi: 10.3969/j.issn.0258-2724.2016.06.008

Received Date: 20 Apr 2015
Publish Date: 25 Dec 2016

Abstract

Abstract

To determine the optimal parameters of railway wind barriers, the protective effects of wind barriers were optimized by surrogate model methods. Firstly, the grid search method was improved to optimize the parameter of support vector machine regression (SVR) model, and an example was used to validate the parameter selection method. Then, the aerodynamic characteristics of a vehicle in the presence of wind barriers were considered as the objective functions, and the optimization model of the protective effects of wind barriers was presented. Lastly, according to the wind tunnel test results, the surrogate models of the objective functions were obtained by the SVR to optimize the heights and porosities of wind barriers. The results show that the modified grid search methods improve the accuracy of the parameter selections of SVR model. The optimal porosity of wind barriers is 0.00-0.17 when the wind barrier height is 1.91-2.90 m. If the height of the wind barrier is more than 2.50 m, the improvement of protective effect is limited with increase of the wind barrier height.
- SVR(vector machine regression),
- wind barrier,
- protective effect,
- surrogate model

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References

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Surrogate Model Optimizations for Protective Effects of Railway Wind Barriers

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