Download Simulation Exam 1 Questions and Answers 2025: A Comprehensive Guide to Simulation Modeling and more Exams Advanced Education in PDF only on Docsity!
SIMULATION EXAM 1 QUESTIONS
AND ANSWERS 2025
simulation mimic the behavior of real systems through simplification, abstraction, and assumption valid model of the system is simple enough to model analytically and get exact results when not to simulate 5- approximately ____% of a project's total time should be spent on developing the objectives and functional specification validation -degree to which a simulation model and its associated data are an accurate representation of the real world from the perspective of the intended uses of the model -does it act like it's supposed to act? verification -determining that a model implementation and its associated data accurately represent the developer's conceptual description and specifications -does it work like it's supposed to work? probability mass function discrete random variable X will take on a possible value probability density function continuous random variable X will take on a possible value between a and b cumulative distribution function function that gives the probability that a random X will be less than or equal to a value false T/F: Data and parameters are deterministic static simulation model at a particular time / time plays no role dynamic simulation model
evolves over time / time is essential and explicit deterministic simulation model fixed / non-random constants stochastic simulation model -random behavior on components to represent realistic variation continuous simulation state of the system changes continuously over continuous time discrete simulation state of the system changes at instantaneous, separated, discrete points of time dynamic, stochastic, discrete what type of simulation are we interested in in this course? event something that happens at an instant of (simulated) time that might change a system state initialization, arrival, departure, end four types of events in simulation counter statistics what type of statistic: -total production during 8 minutes -accumulated sums of something tally statistics what type of statistic: -average waiting time in queue -maximum waiting time in queue -average time in system -maximum time in system time-persistent statistics what type of statistic: -time-average number of parts in system and queue -utilization of the drill machine Q(t) number of parts in the queue at time t B(t)
transfer node change destination/get rides, fixed object output connector zero travel time path entities independently move at their own speeds time path entities complete travel in a specified time conveyor accumulating/non-accumulating conveyor devices objects, processes, user code What are the 3 modeling paradigms? grouping drag columns to different positions to cause the data to be grouped differently sorting click on triangle in column heading to toggle the column sort order between ascending and descending filtering click on the funnel in column heading for a menu to enable/disable display of any field in that column Simio model is wrong, expectation is wrong, sampling error possible reasons why our model results will not match our expectations Simio Measure of Risk and Error what does SMORE stand for? SMORE plot -adds performance risk assessment to typical assessment of statistical error -evaluate single scenario or compare multiple scenarios syntax error incorrect usage of language constructs/modules runtime error program errors that occur during the simulation run (e.g., exceeding the memory limits)
logic error -errors in the modeling logic that cause the simulation to run in an unexpected manner -most difficult to find Navigation:Model > Facility Project Tab how do you get to Facility View? Random.Exponential(mean) What is the syntax for the Exponential distribution? vehicle Which of the following is a Resource object in the Simio standard library? -conveyor -vehicle -transfer node -sink time path Which of the following is a Link object in the Simio standard library? -basic node -sink -server -time path
If the arrival rate of parts to a system is 50/hour. What is the inter-arrival-time (IAT) in minutes? InputBuffer.Contents Each server object has three queues. Which of the following stores entities waiting to be processed? grouping, sorting, filtering Discuss the 3 ways that data appearing in PivotTables can be manipulated. Project Home > New Experiment Where do you go in the Simio user interface to begin (generate) an experiment? still in Run mode If the Properties Window is in gray-scale and you cannot make edits, then you have the following problem decrease Increasing the number of replications will ___________ the half-width size?
time in queue (excluding service time) Server > Input Buffer > Time in Station > Average How do you find Wq (time in queue) on Simio Report / Pivot Grid? W time in system, including time in queue + service time Model Entity > Time in System > Average How do you find W (time in system) on Simio Report / Pivot Grid? Lq number of entities in queue (excluding entities in service) Server > Input Buffer > Number in Station > Average How do you find Lq (# in queue) on Simio Report / Pivot Grid? L number of entities in entire system (queue + service) Model Entity > Number in System > Average How do you find L (# in system) on Simio Report / Pivot Grid? utilization -time average number of individual servers in group who are busy -equal to λ/μ Server > Resource > Utilization (gives %) How do you find utilization on Simio Report / Pivot Grid? Little's Law relates mean queue length to arrival rate and mean response time L = λW What is Little's Law? attribute -local variable characterizing entities -each entity can have same or different values -can be real numbers, integers, text, or other object types or states event calendar
-place where future events are stored -set of records associated with ID of entity, event time -Simio places newly scheduled events in increasing order of event times output buffer queue line that's associated with output side of object input buffer queue line that's associated with input side of object initial transient period time between start of a run and time when model reaches steady state terminating model -useful when interested in how system behavior impacts something -includes transient period in analysis trace type of debugging that gives info about system at different points in time breakpoint type of debugging that stopes your model at designated point in time step type of debugging that allows up to work through system slowly and see what's happening watch type of debugging that allows user to see what's happening for a particular object
