To those interested in road roughness,
The wavelength content of road togography is a mature subject, and has been
covered extensively through the application of spectral analysis and random
vibration theory. A quick literature search will provide you with all you
need to know. (Start with Cebon's "Handbook of Vehicle-Road Interaction"
and work backward through the reference chain.)
Be careful to apply the classic assumptions about road wavelength content
only when they are appropriate. I would caution those new to the subject
that the aspects of road surface shape that violate the typical assumptions
of random vibration theory are often of greatest interest. The few events
that make a road "not quite Gaussian", such as those that contribute to the
extremes of a slope histogram, are usually the ones that count most in
durability and impact feel.
Steve
Steven M. Karamihas
Senior Research Associate
University of Michigan Transportation Reseach Institute
2901 Baxter Road
Ann Arbor, MI 48109-2150
(734) 936-1057
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