Question

Scraper tare (empty)		65000 kg
Average load carried		32 m3
Density of material, in bank		1550 kg/ m3
Load factor I		0.6
Distribution of load to driving wheels (% of gross weight)		59 %
Uphill grade on haul road, loaded		4 %
Traction coefficient, haul road		0.55
Rolling Resistance Factor, loaded		0.39 kN/t
Average speed, haul		18 km/hr
Haul distance		1020 m
Average speed, return empty		44 km/hr
Return distance (by different route)		1130 m
Efficiency factor (operator and scraper together)		41 min/hr
Fixed time is made up of:	Spot time	0.6 min
	Load time	2.7 min
	Dump time	1.4 min

Using the information above calculate the following:

a) Calculate the gross vehicle weight (GVW) (kg).

b) Calculate maximum tractive force (kN) on road at driving wheels when loaded.

c) Calculate the effective grade % on the haul road.

d) Calculate total resistance (kg or kN) while hauling.

e) Calculate the total cycle time (minutes).

f) Calculate production rate, in Bank m³/hr.

Answer 1

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