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Comparison of the Performance of 7-Post and 8-Post Dynamic Shaker Rigs for Vehicle Dynamics Studies
ISSN: 1946-3995, e-ISSN: 1946-4002
Published December 02, 2008 by SAE International in United States
Citation: Southward, S. and Boggs, C., "Comparison of the Performance of 7-Post and 8-Post Dynamic Shaker Rigs for Vehicle Dynamics Studies," SAE Int. J. Passeng. Cars - Mech. Syst. 1(1):1319-1324, 2009, https://doi.org/10.4271/2008-01-2966.
This paper documents a simple theoretical analysis and an experimental performance comparison of the advantages of an 8-post shaker rig relative to a conventional 7-post shaker rig. A simple static model describing the chassis roll and warp characteristics is first presented to illustrate the differences between 7-post and 8-post configurations, and the conditions where an additional aeroloader provides an advantage. Using a late model NASCAR Sprint Cup car, a series of experimental tests were conducted with the 8-post shaker rig at the Virginia Institute for Performance Engineering and Research (VIPER) facility in both 7-post and 8-post configurations. Experimental results confirm the hypothesis that an 8-post configuration is able to more accurately reproduce target motions of the chassis and suspension when those motions include a chassis warp condition.