Roughness-Induced Vehicle Energy Dissipation: Statistical Analysis and Scaling
Publication: Journal of Engineering Mechanics
Volume 141, Issue 11
Abstract
The energy dissipated in a vehicle suspension system due to road roughness affects rolling resistance and the resulting fuel consumption and greenhouse gas emission. The key parameters driving this dissipation mechanism are identified via dimensional analysis. A mechanistic model is proposed that relates vehicle dynamic properties and road roughness statistics to vehicle dissipated energy and thus fuel consumption. A scaling relationship between the dissipated energy and the most commonly used road roughness index, the International Roughness Index (IRI), is also established. It is shown that the dissipated energy scales with IRI squared and scaling of dissipation with vehicle speed depends on road waviness number in the form of . The effect of marginal probability distribution of the road roughness profile on dissipated energy is examined. It is shown that although the marginal distribution of the road profile does not affect the identified scaling relationships, the multiplicative factor in these relationships does change from one distribution to another. As an example of practical application, the model is calibrated with the empirical HDM-4 model for different vehicle classes.
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Acknowledgments
This research was carried out by the CSHub@MIT with sponsorship provided by the Portland Cement Association (PCA) and the Ready Mixed Concrete (RMC) Research & Education Foundation. The CSHub@MIT is solely responsible for content.
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Published In
Journal of Engineering Mechanics
Volume 141 • Issue 11 • November 2015
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© 2015 American Society of Civil Engineers.
History
Received: Sep 23, 2014
Accepted: Feb 2, 2015
Published online: May 15, 2015
Discussion open until: Oct 15, 2015
Published in print: Nov 1, 2015
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