Abstract
Current vehicle dynamic performance indices seem to be insufficient to represent the fundamental of vehicle dynamic performance because they are easily influenced by tuning elements such as springs. In this paper, suspension geometry is discussed as the basis of vehicle ride and handling performance. To analyze the characteristics of the suspension geometry, the screw theory is introduced. The screw axes surface, which is generated by continuous vehicle body motion, is the pure geometric property of the suspensions, and the shape of the surface is not influenced by tuning elements. Therefore, the shape of the screw axes surface can be regarded as the “genome” of vehicle performance. The gradients of screw parameters with respect to body lateral acceleration are proposed for new vehicle dynamic performance, and their correlation to vehicle performance is validated by full vehicle dynamic analysis.
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References
Sir Robert Stawell Ball, A Treatise on the Theory of Screws, Cambridge University Press, 1900.
C. H. Suh, Computer-Aided Design of Mechanisms, Part A and B, Department of Mechanical Engineering, 2005.
UnKoo Lee, A Study on a Method for Predicting the Vehicle Controllability and Stability Performance Using the Screw Axis Theory, Doctoral Thesis, Hanyang University, 2001.
UnKoo Lee, ChangSoo Han, Method for predicting dynamic behavior characteristics of a vehicle using screw theory, Journal of Automobile Engineering, volume 222,issue 1, 65–78, 2008.
C. H. Suh, Suspension Analysis with Instant Screw Axis Theory, SAE 910017 143–151, 1991.
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Dr. Unkoo Lee received his Ph.D. degree in Precision Mechanical Engineering from Hanyaing University, Korea, in 2001. Dr. Lee is working for the Research and Development division of Hyundai Motor Company since 1982. Currently, he is the Executive Vice President of the same company, and leads the development of chassis platform and advanced technologies for vehicles. Dr. Lee has vigorous interests in the research areas of kinematics and vehicle dynamics.
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Lee, U. A proposition for new vehicle dynamic performance index. J Mech Sci Technol 23, 889–893 (2009). https://doi.org/10.1007/s12206-009-0307-6
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DOI: https://doi.org/10.1007/s12206-009-0307-6