Longitudinal Road Profile Spectrum Approximation by Split Straight Lines
Publication: Journal of Transportation Engineering
Volume 138, Issue 2
Abstract
The presented study compares three alternative straight-line approximations of the longitudinal road-profile power spectral density (PSD). The one straight line and two and three split straight-line approximations were analyzed. The minimizing of the root-mean-squared error (RMSE) was used as criteria of goodness of fit for the approximation models. The statistics of the PSD approximation model parameters, i.e., unevenness index, waviness, break angular spatial frequency, and the standard error of the regression for 145 test sections from the long-term pavement performance program (SPS-6) were calculated. The approximations were compared with connected versus unconnected lines. The approximation with two connected lines seems to be a reasonable substitution of a raw spectrum. A mean improvement of approximately 35% compared to the one straight-line approximation was identified.
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Acknowledgments
This work has been undertaken within Grant No. UNSPECIFIED2/0075/10 of the VEGA Grant Agency of the Slovak Academy of Sciences. Further, the author highly appreciates the voluminous work conducted by the LTPP team and additional information provided by the LTPP Customer Service Department.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 138 • Issue 2 • February 2012
Pages: 243 - 251
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Feb 18, 2011
Accepted: Jun 10, 2011
Published online: Jun 14, 2011
Published in print: Feb 1, 2012
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