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PS2-08-solutions

PS2-08-solutions - CE166 Fall 2008 Question 1 Part A...

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CE166 - Fall 2008 Problem Set 2 Solutions Page 1 of 5 Professor Arpad Horvath Department of Civil and Environmental Engineering University of California, Berkeley Question 1 Part A The loaders travel 60 yd per cycle. They have a capacity of 1.5 yd 3 . The cycle takes 60 seconds. The average speed is 15 mi/hr. day yd day hr hr cycle cycle yd rate production time cycle hr mi hr yd mi yd time travel 3 3 634 8 sec 3600 sec 2 . 68 5 . 1 _ sec 2 . 68 sec 2 . 8 sec 60 _ sec 2 . 8 sec 3600 15 1760 60 _ The cranes have clamshells with 4 yd 3 capacity and a cycle time of 30 seconds. day yd day hr hr cycle cycle yd rate production 3 3 3840 8 sec 3600 sec 30 4 _ The dump trucks have a 10 yd 3 capacity and travel 6 miles to a site (12 miles round trip). The average speed is 25 mi/hr and the dumping time is 75 seconds. day yd day hr hr cycle cycle yd rate production time cycle yd yd time load time dump hr mi hr mi time travel time load time dump time travel time cycle 3 3 3 3 153 8 sec 3600 sec 1878 10 _ sec 1878 sec 75 sec 75 sec 1728 _ sec 75 4 sec 30 10 _ sec 75 _ sec 1728 sec 3600 25 ) 6 2 ( _ _ _ _ _ There is a 1.15 swell factor and all equipment is operated 8 hrs/day. The swell factor is not
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