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ARTICLE INFO ABSTRACTArticle history:In 2016, a handmade vehicle called to the VF-3 was designed and manufactured as a formula typed car. Prior to manufacturing and assembly, the impact attenuator was analyzed through ANSYS LS-DYNA, and the results were applied to the VF-3. The dynamical performance of the VF-3, such as the acceleration and circling simulations, was also assessed through MSC-ADAMS.The results were applied and compared after the Korean Society of Automotive Engineers (KSAE) competition. There was only a 0.8 s difference in the acceleration test. In order that the frame was not twisted by thermal deformation, Argon-TIG welding was used and a zig was designed. Another zig was designed to have the exact position for the hardpoints in the suspension system. Most of the parts were made with aluminum 7050 for reduced weight. The VF-3 won the third prize in the 2016 KSAE Student Handmade Vehicle competition.

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This study is based on previously developed tools for car seat designers. A simplified modeling approach to predict the vibration response, about an operating point, of mannequin occupied car seats is demonstrated to be feasible. A two-dimensional model, consisting of rigid bodies interconnected by pin joints with torsional dampers, springs and dampers had been developed. The springs and dampers are linear and the nonlinearity in the model is due to geometric effects, although at vibration levels experienced under normal driving conditions a linearized version of the model predicts responses. The effects of changing model parameters on the natural frequencies, the mode shapes and resonance locations in frequency response functions were shown in previous papers. Reasonable qualitative as well as good quantitative agreement between experimental and simulation frequency response estimates is obtained. Especially, k2 parameter, x-directional excitation and matching between the experiment and simulation are considered. The application of these simplified models is in car seat design, where they would facilitate evaluation of the effects of seat design changes prior to prototyping.

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