Abstract
An alternative lightweight flatbed trailer design is achieved through a multi-stage optimization procedure. Topology optimization is used to obtain the optimal layout of flatbed trailer frame beams that provide minimum compliance when subjected to bending loads and exhibits maximum torsional natural frequency. The ground structure approach is used to define the trailer frame layout by generating numerous beams connected to predefined points in the trailer. Topology optimization is formulated as a multi-objective problem subject to a mass constraint. Responses and sensitivities are evaluated using ANSYS, and the optimization problem is solved using the moving asymptotes method. The thicknesses, widths, and heights of the C-channel beams are optimized for further weight reduction while at least maintaining the structural performances of the original design. Size and shape optimizations are performed using OptiStruct. The new optimal design is approximately 13% (275 kg) lighter than and as stiff as the original design for bending loads. However, the former has 3.5 times higher torsional natural frequency than the latter. Moreover, the new optimal design has positive manufacturability because the channel beams will be made out of commercially available sheet metals. The same fabrication technology as for a conventional flatbed trailer is possibly to be used.
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Henry P. Panganiban served as postdoctoral researcher and part-time professor at the School of Mechanical and Automotive Engineering in Kunsan National University, South Korea after obtaining a Ph.D. from the same university. He is mainly interested in the industrial application of finite element method, mechanical structure analysis and design optimization. He is currently working as technical lab manager for Masteco Industry Co., Ltd., a global fire protection equipment manufacturer based in South Korea.
Tae-Jin Chung obtained a B.S. in Mechanical Engineering from Hanyang University in 1978, and an M.S. and Ph.D. from the same university in 1981 and 1987, respectively. He is a professor at the School of Mechanical and Automotive Engineering, Kunsan National University, South Korea. His research fields include structural dynamic analysis and vibration simulation for industrial machinery applications.
Gang-Won Jang obtained a B.S. in Mechanical Engineering from Seoul National University in 1998, and an M.S. and Ph.D. from Seoul National University in 2000 and 2004, respectively. He is an associate professor at the Faculty of Mechanical and Aerospace Engineering, Sejong University, South Korea. His research fields include a thin-walled beam analysis based on higher order beam theory, structural optimization and wave simulation for NDE applications.
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Panganiban, H.P., Kim, WC., Chung, TJ. et al. Optimization of flatbed trailer frame using the ground beam structure approach. J Mech Sci Technol 30, 2083–2091 (2016). https://doi.org/10.1007/s12206-016-0415-z
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DOI: https://doi.org/10.1007/s12206-016-0415-z