ENIN331: Simulation and Modelling - Engineering Assessment Answer

Engineering Assessment Task

Question 1:

At Southern California Airline's traveller check-in facility, three types of passengers arrive: passengers with e-tickets

(Type E), passengers with paper tickets (Type T) and passengers that need to purchase tickets (Type P). The inter-arrival distributions and the service times for these passengers are given in the table below. Create a simulation model of this system. Run the simulation for 2,000 hours. If the separate gate agents each serve each type of passenger, determine the following:

a) The average and maximum length of the three queues. b) The average number of passengers of each type completing check-in procedures per hour. c) The average utilization of the gate agents. d) The percentage of time the number of passengers (of each type) waiting in line is <= 2.

Question 2

United Electronics manufactures small custom electronic assemblies. Parts must be processed through four stations: assembly, soldering, painting and inspection. Orders arrive with an exponential interarrival distribution (mean 20 minutes). The process time distribution are shown in Table:

Question 3

In United Electronics in previous question 2, 10 percent of all finished assemblies are sent back to soldering for rework after inspection, five percent are sent back to assembly for rework after inspection, and one percent of all assemblies fails to pass and is scrapped. Create a simulation model of this system. Simulate this manufacturing system for 2000 hours. Collect and report statistics on the utilization of each station, total number of jobs assembled, number of assemblies sent for rework to assembly and soldering, and the number of assemblies scrapped during each eight-hour shift (average and maximum).

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