علي مفتحي

In this thesis, the optimal design of the modular body structure of a small urban electric car of class L6 has been investigated. First, the chassis of a two-seater car and a pickup truck were designed in CATIA software, and five different scenarios were selected to select the best scenario in terms of torsional and bending resistance using ABAQUS finite element analysis software.For these analyses, the "rivet nut" connection type was selected. First, the complete model of this connection was modeled in CATIA and then simulated in ABAQUS software according to shear and torsion tests. By extracting the "rivet nut" equivalent model, this model was used to analyze different scenarios. After eva‎luating and comparing the results, the best scenario was selected in terms of torsional and bending strength. In the next step, the thickness of the joints of the best scenario was optimized using the Taguchi optimization method. The results showed that the use of the "rivet nut" equivalent model in the analysis, while reducing time and cost, also provides high accuracy.This research shows that by using modular design and proper optimization, a significant improvement can be made in the efficiency and strength of L6 class small urban electric vehicle structures. Also, the results of this research can be used as a guide for the design and optimization of other electric vehicle structures

بهينه سازي , تحليل المان محدود , قاب سازه فضايي , پيچ پرچي , مدل المان معادل , چهار چرخه

Optimization , finite element analysis , space frame , rivet nut , Equivalent element model , Quadricycle

Ali Mofatehi

Dr. Abolfazl Khalkhali