Development of a lightweight frame for a 40-foot flatbed trailer by using CAE-based structural optimization

Abstract

In this study, a novel ultra-lightweight frame for a flatbed trailer is developed; it has a completely different layout from conventional ladder-type frames and is developed by applying structural optimization using commercial computer aided engineering (CAE)-based software. The proposed process of design optimization consists of two main steps: an initial design step to obtain the optimum layout (or topology) of the structure and a size/shape optimization step to determine its detailed geometric dimensions. In the topology optimization step, an initial design of the frame is generated to obtain the maximized global system performance measures, such as static stiffness or natural frequencies, for which GENESIS, a commercial optimization software package, is used in this investigation. For size and shape optimization, thicknesses of the member plates and the boundary shapes are optimized by using the Taguchi method, in order to minimize further the mass of the frame without violating design constraints on local performance measures such as the allowable stress limit. In addition, manufacturability is also considered during the detail design step of size and shape optimization. As a result, the optimized lightweight frame has improved bending and torsional rigidities while its mass is reduced by 24.5 per cent as compared to that of the original model.

Keywords

flatbed trailer lightweight frame topology optimization Taguchi method manufacturability

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References

Lan

Chen

Lin

Comparative analysis for bus side structures and lightweight optimization. Proc. IMechE, Part D: J. Automobile Engineering, 2004, 218(10), 1067–1075.

Jung

H. S.

Kwon

Topology optimization of rolling stock end frame. In Proceedings of the Korean Society of Mechanical Engineers Annual Spring Meeting, 2006, pp. 1296–1301.

Yoshimura

Nishiwaki

Izui

A multiple cross-sectional shape optimization method for automotive body frames. J. Mech. Des., 2005, 127, 49–57.

Riordan

Tovar

Renaud

Topology optimization of a Formula SAE upright using Optistruct. SAE Paper 2010-01-0396, 2010.

Optistruct user’s guide, Version 8.0, 2007 (Altair Engineering Inc.).

Krog

Tucker

Kemp

Boyd

Topology optimization of aircraft wing box ribs. In Proceedings of the 10th AIAA/ISSMO Conference on Multidisciplinary analysis and optimization, Albany, New York, 2004.

Joo

J. J.

Reich

G. W.

Westfall

J. T.

Flexible skin development for morphing aircraft applications via topology optimization. J. Intell. Mater. Systems Structs, 2009, 20, 1969–1985.

Eves

Toropov

V. V.

Thompson

H. M.

Gaskell

P. H.

Doherty

J. J.

Harris

J. C.

Topology optimization of aircraft with non-conventional configurations. In Proceedings of the 8th World Congress on Structural and multidisciplinary optimization, Lisbon, Portugal, 2009.

Moon

I. D.

C. Y.

Development of a computer model of a large-sized truck considering the frame as a flexible body. Trans. KSAE, 2003, 11(6), 197–204.

10.

Jang

G. W.

Yoon

M. S.

Park

J. H.

Lightweight flatbed trailer design by using topology and thickness optimization. Struct. Multidisciplinary Optimization, 2010, 41(2), 295–307.

11.

Huh

Heo

J. H.

Lee

H. W.

Optimization of a roller levelling process for A17001T9 pipes with finite element analysis and Taguchi method. Int. J. Mach. Tools Mf., 2003, 43, 345–350.

12.

Sheu

J. J.

Yang

C. H.

A simplified column model for the automatic design of the stamping die structure. J. Mater. Processing Technol., 2006, 177, 109–113.

13.

Erzurumlu

Ozcelik

Minimization of warpage and sink index in injection-molded thermoplastic parts using Taguchi optimization method. Mater. Des., 2006, 27, 853–861.

14.

ANSYS structural analysis guide 9.0, 2004 (ANSYS, Inc., Canonsburg, Pennsylvania).

15.

GENESIS design manual version 8.0, 2005 (Vander-plaats Research and Development, Inc., Colorado Springs, Colorado).

16.

Bendsøoe

M. P.

Material interpolation schemes in topology optimization. Arch. Appl. Mechanics, 1999, 69, 635–654.

17.

Kim

J. G.

Yoon

M. S.

Optimal design of lightweight frame for heavy flat-bed trailer by using Taguchi method. Trans. KSME, 2010, 34(3), 353–359.

18.

Phadke

M. S.

Quality engineering using robust design, 1989, (AT&T Bell Laboratories, Prentice-Hall, New Jersey).