Genetically Aerodynamic Optimization of High-Speed Train Based on the Artificial Neural Network Method
The optimization of the car body cross-section shape of high-speed train under cross winds has been performed using genetic algorithms (GA), wherein the computational fluid dynamics (CFD) simulation model was established based on Design of Experiments (DOE), and then the aerodynamic performance of a train subjected to crosswind was calculated by CFD. However, directly using the CFD to compute the high-speed trains performances in an optimization scheme is not suitable for the optimization process. This is because the GA requires a large number of CFD solver calls, which increase the computational cost and time-consuming of the optimization process. To decrease the CFD simulation computational cost, an approximate substituted Artificial Neural Network (ANN) model was proposed. The ANN models were trained and tested using the data obtained from the CFD simulation model, and its correlation coefficient values are considerably close to 1, which indicates fine accuracy and prediction capability. Meanwhile, the impact of the car body cross-section design parameters on the aerodynamic performance has been also investigated, and the result show that the design parameters interrelate each other and jointly impact the aerodynamic performance of high-speed trains. After the optimization, the overturn moment coefficient has been reduced by 17.5%, and the lift force and slid force coefficient have been reduced by 11.5% and 8.05%, respectively. Compared to the original shape, the pressure coefficient of optimal shape has great improvement. The analysis method can provide a frame of reference for the high-speed train safe operation running on the track under crosswind conditions.
KeywordsOptimization ANN High-speed train Genetic algorithm Aerodynamic performance
This work presented here was supported by National Key R&D Program of China under the contract number 2017YFB1300600, and by the National Natural Science Foundation of China under the contract numbers 11772103 and 61304037.
- 1.Chen, R.L., Zeng, Q.Y., Li, D.J.: Advances in Rheology and Its Application. Science Press USA Inc., New York (2005)Google Scholar
- 10.Fujii, T., Maeda, T., Ishida, H., Imai, T., Tanemoto, K., Suzuki, M.: Wind-induced accidents of train/vehicles and their measures in Japan. Q. Rep. Railw. Tech. Res. Inst. 40(1), 50–55 (1990)Google Scholar
- 21.Specht, D.F.: A general regression neural work. IEEE Trans. Neural Netw. (1991)Google Scholar