Abstract
Both the steering and suspension systems have significant impacts on the dynamic performance of vehicles. Considering the coupling effect and aiming to improve the holistic performance of the full vehicle matching with mechanical elastic wheels (MEW), this paper carries out an integrated parameters optimization design of the electric power steering system and suspension systems. Comprehensive performance evaluation indices of the vehicle are formulated, including steering performance, ride comfort, and full vehicle stability. In order to deal with the multi-objective optimization design of the vehicle chassis, this paper puts forward an improved two-level multidisciplinary optimization method named hierarchical coordination optimization (HCO). The HCO method decomposes the optimization problem hierarchically with shared variables and local variables. Furthermore, consistency constraints and penalty functions are introduced into the objective functions of each optimizer to realize the decoupling between the system level and subsystem level. Therefore, system-level and discipline-level optimization can be carried out alternately, which not only simplifies the original optimization problem but also solves the coupling problem. Moreover, the particle swarm optimization algorithm is adopted to realize the entire optimization work. Finally, the optimization results of both vehicle chassis optimization design and numerical example are obtained, which show that HCO performs better than the linear weighted sum method. The simulation results reveal that the proposed optimization strategy can improve the performance of the vehicle equipped with MEW in multiple aspects.
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Funding
This work was supported by the National Engineering Laboratory of High Mobility anti-riot vehicle technology [Grant Number B20210017], the Innovation Fund Project of China Aerospace 1st Academy [Grant Number HTF20200960], the National Natural Science Foundation of China [Grant Number 11672127], the Army Research and Technology Project [Grant Number AQA19001], and the Fundamental Research Funds for the Central Universities [Grant Number NP2020407].
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Xu, H., Zhao, Y., Lin, F. et al. Integrated optimization design of electric power steering and suspension systems based on hierarchical coordination optimization method. Struct Multidisc Optim 65, 59 (2022). https://doi.org/10.1007/s00158-021-03165-x
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DOI: https://doi.org/10.1007/s00158-021-03165-x