7 months ago

Getting Started


2 • GETTING STARTED . What is a model thumbnail? The Navigate panel on the Project Bar provides a model navigation tree for maneuvering through the different named views and hierarchical levels defined in the model. Included as part of the Navigate panel is a model thumbnail that helps users orient and change the current view within the active drawing window. The thumbnail displays the world space of the current drawing window. A colored, translucent rectangle represents the current view's boundaries. Dragging the rectangle in the thumbnail moves the drawing window's current view left, right, up, or down; however, the rectangle may not be dragged outside the boundaries of the world space. You may also re-center the rectangle, and thus the world space, or change the level of zoom. For details on model thumbnail, see the Navigate panel topic in online help. Rerun the simulation Now that we’ve made our animation more interesting and valuable, let’s run the simulation again. Because we did not change any of the process parameters (that is, data in the modules), the simulation will provide the same results. Click Run or press the F5 key to start the simulation. As the simulation progresses, you’ll notice the security officer’s picture changes from idle to busy (engaging with a passenger) and back again, as passenger entities move through the Check for Proper Identification process. The plot shows some significant peaks in the number of passengers who are in line with the security officer, caused by the combination of the variation in the time between arrivals of passengers (defined in the Create module) and the time to check for proper identification (Process module). 29

GETTING STARTED WITH ARENA Next steps You’ve succeeded in modeling, simulating, visualizing and analyzing a simple airport passenger identification screening process. To further explore Arena’s capabilities, try solving a few of these extensions to the process. 1. Add a baggage check screening process following the identification check. Once passengers clear the identification check, they proceed to the X-ray baggage screening. At a minimum, it takes 1.5 minutes per passenger for the X-ray process to complete. Typically, this process takes 2.5 minutes. At the most, this process can last 7 minutes. There are two X-ray machines. What is the maximum time that a passenger had to wait in line for the X-ray machine? What is the utilization of the X-ray machines? 2. Enhance with a random security check for passengers. To increase security measures, it has been decided that a more extensive security check of passengers is necessary after the baggage scan. Every 15th passenger will go through a full-body scan and manual baggage review. This inspection usually takes 5 minutes. At the least, it will take 3 minutes and at the most 10 minutes. Assume there is unlimited availability of resources to model this process. What is the overall average cycle time of passengers (from the time they enter the system until they are through all security points) who are selected for this check? Hint 1: Use the Assign module and define a variable to keep track of the number of passengers through the process. Hint 2: Use the Assign module in combination with the Record to calculate the average cycle time. This problem uses concepts that have not yet been introduced. Proceeding through this entire guide and coming back to this problem is recommended! To view the completed Arena models for the main tutorial and this extension, browse the Examples folder for Airport Security Example.doe, Airport Security Example Extension 1.doe and Airport Security Example Extension 2.doe. Licensed users of Arena Standard and Professional Edtions can further enhance their visualization by using the Arena Visual Designer tool to create 3D animations of their models. 30

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