Motion Resistance of Wheeled Vehicles in Snow

Before vehicle mobility in snow can be reliably predicted, a complete understanding of motion resistance in snow is required. This report examines several aspects of wheeled vehicle motion resistance using results obtained with the CRREL instrumented vehicle. Resistances of leading and trailing tire...

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Bibliographic Details
Main Author: Richmond, Paul W.
Other Authors: COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH
Format: Text
Language:English
Published: 1995
Subjects:
Surface Transportation and Equipment
Snow
Ice and Permafrost
*MOBILITY
*SNOW
*GROUND VEHICLES
VELOCITY
PRESSURE GRADIENTS
MATHEMATICAL MODELS
ALGORITHMS
RESISTANCE
LOADS(FORCES)
COMPARISON
DEFORMATION
MOTION
ANALYSIS OF VARIANCE
DEPTH
REGRESSION ANALYSIS
SNOW COVER
MATHEMATICAL PREDICTION
TRACTION
WHEELS
ROAD TESTS
TIRES
TRUCKS
NONLINEAR ANALYSIS
DRAG
OFFROAD TRAFFIC
ARMORED VEHICLES
TOWED VEHICLES
HMMWV(HIGH MOBILITY MULTIPURPOSE WHEELED VEHICLES)
PE62784A
WUM04
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA294675
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA294675
Description
Summary:Before vehicle mobility in snow can be reliably predicted, a complete understanding of motion resistance in snow is required. This report examines several aspects of wheeled vehicle motion resistance using results obtained with the CRREL instrumented vehicle. Resistances of leading and trailing tires are examined. Limited data are presented for undercarriage drag, and third and fourth wheel passes in the same rut are initially analyzed, as is how snow deforms around a wheel. For the CRREL instrumented vehicle, a trailing tire has a resistance coefficient of about 0.017 for snow depths less than about 22cm. For deeper snow, the disruption of the snowpack caused by a preceding wheel causes snow to fall into the rut, resulting in higher trailing tire coefficients. For larger vehicles, which in some cases have trailing tires carrying larger loads than preceding tires, the trailing tire coefficients are on the order of 0.048 and 0.025 for second and third trailing wheels respectively. Since there are no trailing tire data available for these larger vehicles, these values are based on nonlinear regression analysis, which includes a prediction of the leading tire resistance. The results and observations of this study are applied in a reanalysis of the towed resistance data obtained during the U.S. Army's Wheels vs. Tracks study. An improved algorithm is presented for predicting wheeled vehicle motion resistance caused by snow. (AN)

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