Scraper tare (empty) 72000 kg Average load carried 31 m3 Density of material, in bank 1650...

Scraper tare (empty)		72000 kg
Average load carried		31 m³
Density of material, in bank		1650 kg/ m³
Load factor I		0.7
Distribution of load to driving wheels (% of gross weight)		57 %
Uphill grade on haul road, loaded		4 %
Traction coefficient, haul road		0.53
Rolling Resistance Factor, loaded		0.38 kN/t
Average speed, haul		15 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)		42 min/hr
Fixed time is made up of:	Spot time	0.8 min
	Load time	2.9 min
	Dump time	1.4 min

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

(Answer in kg)

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

(Answer in kN)

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

d) Calculate total resistance (kg) while hauling.

e) Calculate the total cycle time (minutes).

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

Expert Solution

Ally Wells answered 2 years ago

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