Pavement Shoulder Dropoff

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MSI
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Pavement Shoulder Dropoff

Post by MSI » Thu Sep 20, 2012 4:01 pm

Sept 2012: A question from the INCR forum asked about references on Pavement Shoulder dropoffs and the recommend state guidelines.
Here are a few references on the subject:
Some figures from the System Technology Report "The Influence of Roadway Disturbance on Vehicle Handling" by Klein, Johsnson, Stzozak, Contract DOT-HS-J-01223 which are included in the McHenry review of Pavement Shoulder dropoffs
STI_research.jpg
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STI_steer.jpg
STI_steer.jpg (18.78 KiB) Viewed 2253 times
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MSI
Site Admin
Posts: 1145
Joined: Thu Jun 18, 2009 12:37 pm

Re: Pavement Shoulder Dropoff

Post by MSI » Tue Sep 25, 2012 10:43 am

Q: Are there any articles on motorcycles encountering pavement edge irregularities?
A: Recently mentioned in an INCR thread:
SAE paper 2006-01-1561 "Behavior of a Motorcycle after an Encounter with a Road Irregularity Parallel to its Direction of Travel" by L. D. Metz
ABSTRACT
  • In the present work, we study motorcycle dynamics under conditions where the motorcycle-rider combination encounters either a step or a channel parallel to the direction of travel. Analyses are presented from the points of view of geometric, analytical and experimental approaches. As with passenger cars and trucks which encounter so-called “edge drop-offs,” the results depend on the magnitude and shape of the step or channel, velocity of the motorcycle and control input(s) of the rider, if any. Results show than for many common disturbance situations, difficulties may be experienced by the rider.
CONCLUSIONS (partial)
  • Calculations and experiments show that a motorcyclist encountering a step of any significant height at a small angle of attack will be highly unlikely to successfully negotiate the maneuver. If speeds are low, step height is
    low and/or angle of attack is significant (say, > ~ 5-10o), success is much more likely. Additional experiments at higher speeds would be useful, but would be dangerous to the test rider to conduct. A series of experiments with
    a heavily-padded, experienced rider employing gradually decreasing angles of attack and gradually increasing speeds is planned for future research
For full conclusions and details of the study please see Behavior of a Motorcycle after an Encounter with a Road Irregularity Parallel to its Direction of Travel
Question? Comment? Please email forum@mchenrysoftware.com. Also see the McHenry Forum Index
Visit McHenrySoftware.com for technical information & software.
(c) McHenry Software, Inc ALL Rights Reserved.

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