چكيده به لاتين
The main purpose of this study is to reduce the weight of the truck structure and to increase the dynamic and static strength of the truck chassis in order to achieve the best possible geometry for the longitudinal and transverse beam sections of the truck chassis. The most important aspect of this research is that by achieving the desired optimization results, fuel consumption can be improved and pollution from fossil fuel consumption can be reduced. This leads to economic savings in the field of energy and more importantly, it becomes economical to use raw materials to produce heavy vehicle chassis. The necessity of carrying out this dissertation is related to environmental concerns, global warming, reduction of fossil fuel resources, and reduction of vehicle chassis weight for acceleration, braking, and maneuvering. In addition, the presence of commercial vehicle manufacturing companies in the country further highlights the importance of this project. This dissertation uses experimental design in Taguchi method and applies analysis in Abaqus, which is one of the tools for optimization of the car chassis in the early stages of design. For validation of the results, a heavy vehicle chassis is used as the main model. Furthermore, chassis models with shell and solid elements have been applied in which the chassis consists of two longitudinal and seven transverse beams. In order to validate the chassis with the reference research article, static accuracy is applied to include chassis flexural stiffness with solid and shell models provided in Abacus. Investigations on the solid and shell models in the bending, torsion, acceleration, braking, and buckling tests illustrate the high influence of the transverse parameter on the section of the chassis beams. During the optimization, the dimensions of the cross section and the thickness of the beams are considered as the design variables. The static and dynamic stiffness and the weight have been simultaneously taken as the objective function and the design constrains. Finally, using Taguchi method, a number of designs are chosen for optimization and compared against each other. Based on the results, around 12% and 10% weight reduction was observed in longitudinal and transverse beams, respectively, without any reduction on the bending and torsion stiffness. As a matter of fact, by choosing the right design parameters, an increase in bending and torsion stiffness is observed.
