Abstract
To analyze the rollover safety, finite element models were established for the electric bus body frame, rollover simulation platform, living space, and bus rollover. The strength and stiffness of the body frame were calculated under four typical working conditions considering the main low-order elastic modal characteristics. The results indicate that the initial body frame of the electric bus satisfies the required structural strength, stiffness, modes, and rollover safety, and it has great potential for lightweight design. Sensitivity and structural contribution analyses were performed to determine the design variables for lightweight optimization of the body frame, and a mathematical model was established for multi-objective collaborative optimization design of the electric bus. Then, the radial basis function neural network was used to approximate the optimization model. Besides, the accuracy of the approximate model was verified, and the non-dominated sorting genetic algorithm II was employed to determine solutions for the lightweight optimization. Compared with the initial model, the mass of the optimized model is reduced by 240 kg (9.0%) without any changes in the materials of the body frame.
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Abbreviations
- NSGA-II:
-
Non-dominated sorting genetic algorithm II
- RBF:
-
Radial basis function
References
Wang, D.F., Wang, Z.W., Dong, X.F.: China Automotive Lightweight Development: Strategy and Path. Beijing Institute of Technology Press, Beijing (2015)
Zhao, H., Jiang, K., Cao, W.G., et al.: Finite element analysis for half-integral body structure of buses. Automot. Eng. 320(4), 346–350 (2007)
Zhang, C.Z.: Lightweight development and design of urban bus body frame based on high-strength steel. Mech. Electr. Technol. 66(1), 57–59 (2018)
Wang, B., Fan, Z.W., Lin, W.: Lightweight research for electric bus. Bus. Coach. Technol. Res. 24(2), 17–18 (2012)
Cao, W.G., Li, H., Chen, W., et al.: Finite element analysis of the strength and stiffness of a coach body. Trans. Chin. Soc. Agric. Mach. 38(3), 39–43 (2007)
Lin, B.H.: Research on the vehicle body structure lightweight based on stiffness and strength performance for a new energy city bus. Automot. Technol. 13(3), 87–91 (2019)
Guler, M.A., Elitok, K., Bayram, B., et al.: The influence of seat structure and passenger weight on the rollover crashworthiness of an intercity coach. Int. J. Crashworth. 12(6), 567–580 (2007)
Guler, M.A., Atahan, A.O., Bayram, B.: Crashworthiness evaluation of an intercity coach against rollover accidents. Int. J. Heavy Veh. Syst. 18(1), 64–82 (2011)
Wang, D.F.: Auto Body Parametric and Lightweight Design. Machinery Industry Press, Beijing (2019)
Su, R.Y., Gui, L.J., Wu, Z.B., et al.: Multidisciplinary collaborative optimization design of bus body frames. J. Mech. Eng. 46(18), 128–133 (2010)
Su, R.Y., Gui, L.J., Fan, Z.J.: Multi-objective optimization for bus body with strength and rollover safety constraints based on surrogate models. Struct. Multidiscipl. Optim. 44(3), 431–441 (2011)
Fan, Z.J., Ma, L., Gui, L.J., et al.: Multi-objective optimization of bus rollover crashworthiness. J. Syst. Simul. 24(5), 1109–1113 (2012)
Yang, Z., Deng B.Q., Deng, M.Q., et al.: A study on finite element analysis of electric bus frame for lightweight design. In: 2018 International Forum on Construction, Aviation and Environmental Engineering-Internet of Things, IFCAE-IOT 2018, Guangzhou, 11–13 May 2018
Wang, D.F., Mao, A.H., Niu, Y.Y., et al.: Lightweight multi-objective optimization design for body frame of pure electric large bus based on topology optimization. Chin. J. Highway Transp. 30(2), 136–143 (2017)
Fu, C.L., Bai, Y.C., Lin, C., et al.: Design optimization of a newly developed aluminum-steel multi-material electric bus body structure. Struct. Multidiscipl. Optim. 60(5), 2177–2187 (2019)
GB/T 17578-2013: Requirements and Test Methods of Strength for the Superstructure of Bus. China Standard Press, Beijing (2013)
Hong, Q.Q., Zhao, K., Zhang, P.: Theoretical Basis and Engineering Applications of OptiStruct & HyperStudy. Machinery Industry Press, Beijing (2013)
Xiong, F., Wang, D.F., Ma, Z.D., et al.: Structure-material integrated multi-objective lightweight design of the front end structure of automobile body. Struct. Multidiscipl. Optim. 57(2), 829–847 (2017)
Acknowledgements
This research work is supported by the National Key Research and Development project of China (Grant No. 2018YFB0105900) and Jilin Province and Jilin University jointly sponsor special foundation (Grant No. SXGJSF2017-2-1-5).
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Wang, D., Xie, C., Liu, Y. et al. Multi-objective Collaborative Optimization for the Lightweight Design of an Electric Bus Body Frame. Automot. Innov. 3, 250–259 (2020). https://doi.org/10.1007/s42154-020-00105-1
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DOI: https://doi.org/10.1007/s42154-020-00105-1