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Computer Simulation Final Project

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Computer Simulation Final Project

  1. 1. SNHU Final Project Milestone 3 Heather Moore 3/23/2014 The following document outlines the creation of a 3D FlexSim simulation model. The model is a mock-up of an airport security checkpoint that is looking for ways to speed up wait times and still thoroughly check passengers for weapons and unapproved items.
  2. 2. IT 630 Final Project Heather Moore 1 | P a g e Table of Contents Executive Summary........................................................................................................................ 2 Problem formulation....................................................................................................................... 3 Description of simulation........................................................................................................ 3 Problem situation .................................................................................................................... 3 What-if questions.................................................................................................................... 3 Base model and alternative models................................................................................................. 6 Input analyses.................................................................................................................................. 7 Verification and Validation............................................................................................................. 8 Calculation of number of runs ........................................................................................................ 9 Output analyses............................................................................................................................. 10 Cost-benefit analysis..................................................................................................................... 10 Summary....................................................................................................................................... 11 Figures Figure a - OFD Model 1.................................................................................................................. 4 Figure b - OFD Model 2 ................................................................................................................. 5 Figure c - Base Model..................................................................................................................... 6 Figure d - Alternative Model .......................................................................................................... 7 Figure e - Comparison of the two models....................................................................................... 9 Figure f - Average Staytime for Scanner 1 Model.......................................................................... 9 Figure g - Average Staytime for Scanner 2 Model....................................................................... 10
  3. 3. IT 630 Final Project Heather Moore 2 | P a g e Executive Summary The project required the creation of a real-world problem in FlexSim’s 3D simulation software. We were to create a situation that we could demonstrate an issue and find a solution. My model is an airport security check-point where the waiting time to go through the scanner was excessive and needed to be shortened to ensure passengers reached their gate on time. The first model demonstrated the wait times and flow of one metal detector and x-ray scanner while the second model demonstrated the use of two metal detectors and x-ray scanners. The wait times decreased a significant amount with the second model.
  4. 4. IT 630 Final Project Heather Moore 3 | P a g e Problem formulation Description of simulation The simulation I am going to create is the security checkpoint at an airport. There will be multiple scanners for luggage and people going through the checkpoint. Depending on the number of people going to the gates will affect how busy or slow the checkpoint becomes. Some passengers will not pass the initial security scan and will have to continue to the manual search area to be cleared. This will affect overall time in the check-point which will slow down the flow. Problem situation There are long lines of passengers going through the security checkpoint. The long waits are causing people to be late for their flights. There needs to be a solution determined for speeding up the lines but still maintaining the security of all passengers. What-if questions What if there was more than one scanner location for the passengers to move through?
  5. 5. IT 630 Final Project Heather Moore 4 | P a g e System and simulation specification Object Flow Diagrams Figure a - OFD Model 1
  6. 6. IT 630 Final Project Heather Moore 5 | P a g e Figure b - OFD Model 2
  7. 7. IT 630 Final Project Heather Moore 6 | P a g e Base model and alternative models Figure c - Base Model The base model contains one metal detector scanner and one x-ray scanner for luggage. Processing passengers through the metal detector is causing long wait times of about 80 minutes. This is causing passengers to be late or miss their flights due to the long wait times. The base model also has a manual search area for those passengers who are picked for further screening. Currently the metal detector takes anywhere between 10 to 25 minutes to scan a passenger. If they are selected for further scanning then they are sent to the manual scan station where it can take another 5 to 20 minutes to process them. The passenger’s luggage must go through an x-ray scanner that takes between 3 to 10 minutes to scan. If the content doesn’t pass the x-ray scan then it is moved to the manual search area to be further inspected by the security. The manual search for the luggage takes between 5 to 10 minutes to be searched. The average wait time for the manual scan area is about 10 minutes long.
  8. 8. IT 630 Final Project Heather Moore 7 | P a g e Figure d - Alternative Model The alternative model contains double the metal detectors and x-ray machines for faster processing. The amount of time it takes to scan each person and luggage is the same for each scanner but now there are two scanners doing the same amount of work as previously there was only one. I anticipate that this will speed up the process time significantly. Input analyses The model runs a 16 hour day (960 minutes) to account for the airport being open from 7:00am to 11:00pm daily. There are two separate flow items created one that represents passengers and the other that represents their luggage. Passengers were assigned item number 1 and luggage was assigned item number 2. These item numbers help control the flow of where each is processed when going through the screening checkpoint. Each passenger is also randomly assigned a shirt color to help tell each person apart and watch them flow through the model. In the base model I originally had the queue send to port based on expression which sent item 1 to port 1 and item 2 to port 2. The manual scan queue is still set this way but I quickly realized this was not going to work for the alternative model’s first queue where there were more ports so I was able to pull into the processor the relevant flow item by changing the setting for
  9. 9. IT 630 Final Project Heather Moore 8 | P a g e Input under the Flow tab of the processor. This ensures that the passengers are going through the metal detector and the luggage is going through the x-ray scanner. The processor then randomly chooses weather to send the item to the manual scan queue or the corresponding sink. Once processed through the manual scan all items flow to the sink. The processor times were determined by taking into account that some people walk slower, have trouble taking off their shoes, or loading their luggage on the x-ray scanner therefore the times ranged from 10 to 25 minutes. The luggage processor was place at 3 to 10 minutes of time for the operator to scan the luggage. This time takes into consideration that some bags will be packed more than others making it harder to fully x-ray. Both the manual search processors were set to process items between 5 to 20 minutes so that the operator had time to fully search the luggage or passenger if there were questions about what they were taking on the plane. Verification and Validation I followed three sets of data to determine if the alternative model had better results than the base model. The main one was the average wait time of the first queue in the check-point. This showed a significant amount of time passengers were waiting to go through security. I also tracked the number passengers and the number of luggage that was processed overall. This showed that there were only about 55 people being processed through the security check-point over the course of 16 hours. After adding the second check-point scanners the number of people almost doubled.
  10. 10. IT 630 Final Project Heather Moore 9 | P a g e Figure e - Comparison of the two models Calculation of number of runs Using the Simulation Experimenter tool I monitored the variable for Max Wait Time on the first queue in the sequence. Figure f - Average Staytime for Scanner 1 Model
  11. 11. IT 630 Final Project Heather Moore 10 | P a g e Figure g - Average Staytime for Scanner 2 Model Output analyses What if there was more than one scanner location for the passengers to move through? With the addition of a second scanning area the wait time decreased by 94%. This significantly saves the passengers time when trying to catch their plane. There was also a 67% increase in the number of passengers that were processed through the entire check-point. Lastly the processed luggage was increased by 11%. Overall the addition of a second security scanning area increased numbers across the board. Cost-benefit analysis My models did not look at the cost of running each security check-point. The second model Airport Security Model Avg Wait Time Passengers Processed Luggage Processed Scanner 1 95.84 55 98 Scanner 2 5.78 92 109 Totals 94% 67% 11%
  12. 12. IT 630 Final Project Heather Moore 11 | P a g e would definitely cost more to run due to the increase in operating staff and extra machines. Although looking at the number of passengers that went through on one work day it doesn’t seem like the cost of running two scanners would be worth it for the number of passengers who are traveling through the airport. Now if I had setup the sources differently to allow an increase in the throughput of passengers this might be a better solution. Summary I learned a great deal by creating this model. I was able to apply what I had learned during the course to my models to achieve the results I had envisioned. There is still a lot that I could have incorporated into my models but I found many of the tutorials to be lacking in explanation of how to use the system and how to manipulate the data to create the model I wanted. I am really happy with the final result though. I have to admit at first I didn’t think I would be able to successfully complete the final project.
  • juliandearteaga

    Jul. 13, 2015

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