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MEM506 Operations Research and Simulation

Question:
Multiple Server System Simulation

Multiple Server System Simulation You are an engineering manager in charge of a service center where customers arrive to the center with an arrival rate l = 30 customer and hr. As shown in below figure, the service center has parallel 3 service stations each with a service rate m = 12 customer/hr. Both inter-arrival and service times are exponential.

-As an Engineering Manager of the service center, you decided to use the following five key performance measures (KPIs) are:

- Avg. customer waiting time (Wq) - Avg. time a customer spends in the service center (W) - Avg. number of customers waiting in the queue (Lq)

- Avg. number of customers in the service center (L)

- Avg. server utilization (U) Based on the given information, you need to estimate the five KPIs for the service center in order to monitor and improve its performance.

Procedure:

- Use queuing formulas in QM for Windows to estimate the 5 KPIs. - Name the model with your name - Show a screen shot your input and output screens

- Build an ARENA model of the service center

- Name the ARENA model with your name - Show a screen shot of details of each model element (Create, Process, etc.)

- Show the complete model picture.

- Run the model for 40 hours (one week) of operation and obtain results report.

- Study and understand all the elements of the simulation report. - Include the report of simulation results in the appendix.

- Use the simulation results to estimate the averages of same five KPIs.

- Compare QM to ARENA simulation results to simulation results and show differences (Use a table to compare results).

- What can you do to improve the accuracy of ARENA simulation results?

- Use ARENA to sketch one server utilization with run time (40 hrs), what do you conclude?