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MCS,PHD
Argosy University/ Phoniex University/
Nov-2005 - Oct-2011
Professor
Phoniex University
Oct-2001 - Nov-2016
A wheel tractor-scraper is operating on a level grade. Assume no power Berating is required for equipment condition. altitude, and temperature. Use equipment data from Fig. 6.10.
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a. Disregarding traction limitations, what is the maximum value of rolling resistance (in lb/ton) over which the fully loaded unit can maintain a speed of 20 mph?
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b. What minimum value of coefficient of traction between the tractor wheels and the traveling surface is needed to satisfy the requirements of pan a? For the fully loaded condition 67% of the weight is distributed to the drive axle. Operating weight of the empty scraper is 70,000 lb.
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