Vehicle Dynamic Safety in Measured Rough Pavement
Publication: Journal of Transportation Engineering
Volume 137, Issue 5
Abstract
Dynamic vehicle behavior is used to identify safe traffic speed limits. The proposed methodology is based on the vehicle vertical wheel contact force response excited by measured pavement irregularities on the frequency domain. A quarter-car model is used to identify vehicle dynamic behavior. The vertical elevation of an unpaved road surface has been measured. The roughness spectral density is quantified as ISO Level C. Calculations for the vehicle inertance function were derived by using the vertical contact force transfer function weighed by the pavement spectral density roughness function in the frequency domain. The statistical contact load variation is obtained from the vehicle inertance density function integration. The vehicle safety behavior concept is based on its handling ability properties. The ability to generate tangential forces on the wheel/road contact interface is the key to vehicle handling. This ability is related to tire/pavement contact forces. A contribution to establish a traffic safety speed limit is obtained from the likelihood of the loss of driveability. The results show that at speeds faster than the likelihood of tire contact loss is possible when traveling on the measured road type.
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Acknowledgments
The writer would like to thank the Mechanical Engineering Department of the Escola Politécnica da Universidade de São Paulo (EP-USP), for the support to this research.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 137 • Issue 5 • May 2011
Pages: 305 - 310
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 28, 2009
Accepted: Aug 30, 2010
Published online: Sep 4, 2010
Published in print: May 1, 2011
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