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2 cards from this section. Quick, good the night before a test.
Define required power in the context of earthmoving operations.
Think about what the machine needs to do in order to move.
What type of resistance is faced by wheels rolling over a surface?
It relates to the friction between the wheel and the surface.
What is required power?
Consider the factors involved in movement.
Rolling resistance affects the cost of operation.
Think about how power impacts costs.
A loader with a gross weight of 30,000 kg experiences a rolling resistance of 50 kg per ton when unloading materials from a construction site for a distance of 500 meters. Calculate the tractive effort required.
Use the total weight multiplied by the rolling resistance value.
If a typical truck tire sinks into a soft surface causing an additional resistance of 10 kg per ton for each inch of penetration, how would you adjust your required power estimation knowing the load is 25 tons and the tire sinks by 6 inches?
Calculate the total resistance by considering all factors.
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