Chapter 9_ Arena Modeling Models Samples_1 [Compatibility Mode].pdf

Chapter 9_ Arena Modeling Models Samples_1 [Compatibility Mode].pdf

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Chapt. 5 -- Handout 1 Chapter 9 – Modeling Detailed Operations Slide 1 of 68 Modeling Detailed Operations Chapter 5 Chapter 9 – Modeling Detailed Operations Slide 2 of 68 Model: An Automotive Maintenance and Repair Shop New three-bay (bệ: khung..) suburban satellite facility Appointments taken up to three days in advance No appointments taken for current day Number of calls per day ~ Poisson with mean 25 calls/day 55% of calls schedule appointment for the next day 30% for two days out 15% for three days out If no appointment is available on the desired day, there’s a 90% chance that the caller will want to schedule for the following day Other 10% just go away
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Chapt. 5 -- Handout 2 Chapter 9 – Modeling Detailed Operations Slide 3 of 68 An Automotive Repair and Maintenance Shop (cont’d.) 80% leave vehicle for service, come back later Other 20% wait at the shop Wait customers given approximate wait time Estimated service time (Book Time) + Allowance (1 hour) Limit of five wait customers per day Book Time ~ 44 + 90*BETA(2, 3) minutes Actual service time ~ GAMM(Book Time/1.05, 1.05) minutes Maximum of 24 hours (Book Time) scheduled per day (three bays, eight hours each) Chapter 9 – Modeling Detailed Operations Slide 4 of 68 Costs, Revenues Capital and labor cost = $45/hour/bay 40-hour work week Revenue from customer = $78/hour (charged for Book Time, not actual time) Overtime costs $120/hour Maximum of three hours/day/bay If service can’t be completed that day, vehicle is held over night and customer gets free loaner car Loaner car costs the shop $35/day If service isn’t started that day, customer takes car home and returns next day – no cost to shop
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Chapt. 5 -- Handout 3 Chapter 9 – Modeling Detailed Operations Slide 5 of 68 System Performance Daily profit Daily Book Time Daily actual service time Daily overtime Daily number of wait appointments not completed on time Chapter 9 – Modeling Detailed Operations Slide 6 of 68 Building the Model Defining the Data Submodel Creation Divide model in sections or submodels Generate Appointment Calls Make Appointment Service Activity Update Performance Variables Control Logic We’ll discuss each of these in turn
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Chapt. 5 -- Handout 4 Chapter 9 – Modeling Detailed Operations Slide 7 of 68 Simulation Replication Data Project replication parameters Run/Setup dialog – Replication Parameters tab 10 Replications of 20 twelve-hour days each Four options for Initialization Between Replications: Initialize system (yes), initialize statistics (yes): selected 10 independent, identical replications – vehicles not carried over at end of month Reports for each month separately, and aggregated Initialize system (yes), initialize statistics (no) 10 independent, identical replications – vehicles not carried over at end of month Cumulative summary reports (month 1, months 1-2, months 1-3, …, months 1-10)
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  • Spring '12
  • NguyenXuanLong,JohnLafferty
  • Working time, Chapt.

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