Simulation Modeling, Assignments

The assignment is due on December 15.

1. Cars arrive at a crossing of two one-way roads. The interarrival times for XX cars are neg.exp with mean time IARR sec (see the table below). The green light is on for pre-set initial time of PRE-SET sec with a possible extension of N-EXT times 3 sec if there are cars waiting to pass. If there still are cars waiting after all extensions, a delay of DELAY sec will occur before red light is turned on, otherwise an immediate switch is made at any discrete decision time after the pre-set initial. The passing procedure is the same for both roads: there is a passing time of 2 sec followed by a neg.exp. with mean time 0.5 sec for each car before the next car to pass can start to pass. When the ligths turn red for one road it turns green for the other. The data for the two roads NS (North-South) and EW (East-West) are:

           XX     IARR    PRE-SET    N-EXT    DELAY
           NS    1/0.20      X         x        2
           EW    1/0.15      Y         y        1
   

   1. Design the Simulation net for the system description above
   2. Realize the model
      1. by using SimNet
      2. by using Simula

   Write a complete documentation by using the documentation model provided in the book Törn: Simulation Modelling. You are requested to determine optimal values of x,y in {1,2,...,5} and X,Y in {10,15,...,30} so that the waiting times for the cars are minimized. How sensitive is the result to the DELAY times? The result part should contain all interesting data about the crossing. The validation of the models is very important and in the validation section you must present validation results which will convince the reader that all measures to check the validity of the models have been taken.

2. Any other assignment of similar size of your own choice can be accepted provided that you present it to me in written at Quiz 1.