Technical Paper
Design Optimization of a Lightweight Electric Bus Body Frame Orienting the Static Performance and Side Impact Safety
2024-04-09
2024-01-2461
This work aims to perform the optimization of the iron-aluminum lightweight body frame of a commercial electric bus orienting the static performance (e.g., strength and stiffness), side impact safety, and possible reduction in mass. Firstly, both he static and side impact finite element (FE) models are established for the electric bus body frame. The body frame is partitioned according to the deformation relationship and thickness of the square tube beams, and the contribution degree is analyzed by the relative sensitivity and the Sobol index method. The thickness of the tube beams in the nine regions is selected as the optimization design variables. After data sampling by the Hamersley method and conducting design of experiments, the surrogate model for optimization is fitted and built by the least square method.