چكيده به لاتين
Nowadays, reducing vehicle weight is a solution to improve fuel consumption and reduce emissions. in this thesis, optimization of cross section dimensions of vehicle body constituent and components thickness of column B_Pillar for weight loss are discussed. simplified models are a good tool for Structural optimization of vehicle in early stages of design. a simplified model is presented from body of a sedan vehicle, in which beam members have been replaced with one-dimensional beam elements, in order to validate static accuracy of simplified model, torsional and bending stiffness is calculated for complete vehicle finite element model and simplified model. results show high accuracy of simplified model in predicting torsional and bending stiffness of vehicle body. in this analysis, cross section dimensions and thickness of beams constitutiving A_pillar, Roof rail, B_pillar, as well as vehicle roof dimensions as design variables, as well as stiffness, bending stiffness and vehicle weight are considered simultaneously as objective functions. for optimization, structure paramagnetic model and vehicle body is first created with help of Python and Abaqus software. after creation of parametric model, body beams cross section of vehicle is analyzed and optimized with help of Imperialist Competitive Algorithms. in this optimization, design parameters consist of beams cross-sectional and beams thicknesses(including four different thicknesses), beam height and width, and optimization constraint of body vehicle behavior under different loading conditions. after completing optimization process, body vehicle with optimum cross-sectional area is analyzed by Abaqus software and its performance is checked. results are shown body vehicle is optimized than the main body vehicle, while at same time it has a good performance.
Keywords: Sedan car, Structure and body of the car, Imperialist Competitive Algorithms, Finite Element Method and Simplified Model, Torsional stiffness and Bending stiffness
