System Dynamics 3

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# System Dynamics 3 - PowerPoint PPT Presentation

System Dynamics 3. CAP4800/5805 Systems Simulation. Tips for Constructing Models (from VenSim). When constructing a Level and Rate diagram, consider what variables accumulate over a period of time Another way to think about this is:

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### System Dynamics 3

CAP4800/5805

Systems Simulation

Tips for Constructing Models (from VenSim)
• When constructing a Level and Rate diagram, consider what variables accumulate over a period of time
• if time slowed down to zero for your system, what variables would still be nonzero?
• For example, in the system where you pour water into a glass, the water contained in the glass is the Level. If you froze time, the pouring (a Rate) would stop, but you would still see a quantity of water in the glass (a Level)
• Once you know what levels you need, enter them first and then connect the rates and auxiliaries
VenSim Modeling & Simulation
• The modeling process starts with
• Sketching a model
• Writing equations
• Specifying numerical quantities
• Then simulate the model
• Simulation output automatically saved as a dataset
• Analysis tools: examine and discover the dynamic behavior of variables in the model
VenSim
• http://www.vensim.com/
• User’s Guide:

http://www.vensim.com/documentation.html

• Today we will cover two examples from the User’s Guide
• Chap 4 Causal Loop Diagramming
• Work to do Project Model
• Chap 6 Building a Simulation Model
• Rabbit Population Model
Equations(Rabbit Population Model)