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Title: Improving the traction prediction capabilities in the NATO reference mobility model (NRMM)
Authors: Priddy, Jody D.
Keywords: Drawbar pull
Mobility modeling
NATO Reference Mobility Model
Pneumatic tire
Vehicle Cone Index
Wheeled vehicle
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-99-8.
Description: Technical Report
Abstract: The NATO Reference Mobility Model (NRMM) has traction relationships that describe the performance of vehicles in naturally occurring soils reasonably well, but they have weaknesses stemming primarily from an inadequate consideration of the influence of vehicle characteristics on traction. This research sought to demonstrate the feasibility of developing better traction relationships for NRMM through exploitation of existing data. In order to demonstrate the feasibility, a statistical modeling effort was conducted for developing new traction relationships. The research involved a systematic and extensive exploration of new and old traction modeling concepts that rely on relatively simple characterizations of the vehicle and the soil. The effort concentrated on one-pass vehicle cone index (VCI1) and draw bar performance of pneumatic-tired vehicles on nonslippery, highly plastic clay soils (CH classification). The results demonstrated that better traction relationships can be developed for NRMM and provided new insight into the controlling mechanisms in VCI1 and drawbar performance.
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