CPEM Chapter 6--Mobile Power Requirements [Compatibility Mode]

# CPEM Chapter 6--Mobile Power Requirements [Compatibility Mode]

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1 Instructor: Dustin Olson, MBA “Why does a machine only travel at 10 mph when its top speed is 30 mph?” This is a critical question because: Speed affects cycle time Cycle time drives production Production determines cost Speed affects cycle time Cycle time drives production Production determines cost The payload capacity of construction excavation and hauling equipment can be expressed either Volumetrically or gravimetrically .

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2 Rolling resistance is a measure of the force (lb/ton) that must be overcome to rotate a wheel over overcome to rotate a wheel over the surface on which it makes contact. Tire flexing Rolling resistance is caused by Internal friction Tire penetrating the surface If tire penetration is known Rolling resistance (lb) = GVW x ([TP x 30] + 40 TP = tire penetration, inches (may be different for haul and return) GVW = gross vehicle weight, tons GVW x ([TP x 30] + 40) If tire penetration is known Rolling Resistance (lb/ton) can be estimated from the information in Text Table 6.1
3 If haul roads are well maintained rolling resistance is less and production improves. Good haul water trucks, so there is a cost. production improves. Good haul roads require graders and We seldom find a haul road which is level from point of load to point of dump.

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CPEM Chapter 6--Mobile Power Requirements [Compatibility Mode]

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