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Conceptual and detailed design of an automotive engine cradle by using topology, shape, and size optimization

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Abstract

An automotive engine cradle supports many crucial components and systems, such as an engine, transmission, and suspension. Important performance measures for the design of an engine cradle include stiffness, natural frequency, and durability, while minimizing weight is of primary concern. This paper presents an effective and efficient methodology for engine cradle design from conceptual design to detailed design using design optimization. First, topology optimization was applied on a solid model which only contains the possible engine cradle design space, and an optimum conceptual design was determined which minimizes weight while satisfying all stiffness constraints. Based on topology optimization results, a design review was conducted, and a revised model was created which addresses all structural and manufacturability concerns. Shape and size optimization was then performed in the detailed design stage to further minimize the mass while meeting the stiffness and natural frequency targets. Lastly, the final design was validated for durability. The initial design domain had the mass of 82.6 kg; topology optimization in conceptual design reduced the mass to 26.7 kg; and the detailed design task involving shape and size optimization further reduced the mass to 21.4 kg.

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Acknowledgments

The authors would like to express their thanks to the group of CAD & CAE department and the members of Research & Development department from Van-Rob Inc. Their suggestions are acknowledged and much appreciated.

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Authors and Affiliations

  1. Department of Mechanical and Materials Engineering, Queen’s University, Room 213, Jackson Hall, 5 Field Company Ln, Kingston, Ontario, K7L 2N8, Canada

    Chao Li

  2. Department of Mechanical and Materials Engineering, Queen’s University, Room 305, McLaughlin Hall, Kingston, Ontario, K7L 3N6, Canada

    Il Yong Kim & Jack Jeswiet

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  1. Chao Li
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  2. Il Yong Kim
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Correspondence to Il Yong Kim.

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Li, C., Kim, I.Y. & Jeswiet, J. Conceptual and detailed design of an automotive engine cradle by using topology, shape, and size optimization. Struct Multidisc Optim 51, 547–564 (2015). https://doi.org/10.1007/s00158-014-1151-6

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