USING ARENA ONLY

Parts arrive to a manufacturing system composed of two workstations according to TRIA(4,4,12) minutes.

Upon arrival the parts are sent to the 1st workstation, it has two workers working in parallel to clean and prepare parts for machining, the processing time for each of the workers is 6+expo(6) minutes.

Parts then are sent to an automatic machine station, the processing time is exactly 5.5 minutes.

Completed parts are inspected, 80% are considered good and leave the system. 13% have minor problems and will need reworking so they are sent back to the automatic machine. The machine cycle time for the rework is the same as the processing time of unprocessed parts. The reminder of parts are labeled defective and scrapped.

Run the system for 5 days, each day has 8 working hours (1 shift), give the workers a break of 1 hour after 3 hours into their shift. Use the policy preempt when dealing with the schedules. [DO 10 replications]

Parts arrive to a manufacturing system composed of two workstations according to TRIA(4,4,12) minutes. Upon arrival the parts are sent to the 1st workstation, it has two workers working in parallel to clean and prepare parts for machining, the processing time for each of the workers is 6+expo(6) minutes. Parts then are sent to an automatic machine station, the processing time is exactly 5.5 minutes. Completed parts are inspected, 80% are considered good and leave the system. 13% have minor problems and will need reworking so they are sent back to the automatic machine. The machine cycle time for the rework is the same as the processing time of unprocessed parts. The reminder of parts are labeled defective and scrapped. Run the system for 5 days, each day has 8 working hours (1 shift), give the workers a break of 1 hour after 3 hours into their shift. Use the policy preempt when dealing with the schedules. [DO 10 replications] Assess if the following statements are correct or not A The waiting time for process 1 is significantly ( a=0.05 ) greater than the waiting time for process 2 B The average total time is about 82.1 min The average WIP is equal to 14.7parts The instantaneous) utilization of each worker averages 75.59% E The number of parts that were sent to rework are about 48.7 parts f The number of parts that were sent to rework are about 27.4 G The number of parts that were scrapped are about 23.7 @ The system Throughput (only good parts) is about 63.2 products /day O The number of parts waiting for process 1 and 2 averages 2.21 and 1.25 parts, respectively., The number of parts waiting for process 1 and 2 averages 8.77 and 3.18 parts, respectively., The percentage of value added time in the system is below 40% The max number of times a part has been sent to rework is about 3 times