I have not used the System Dynamics modelica library, so cannot speak to how they have chosen to implement their interfaces. RealOutput y "Connector of Real output signals" RealInput u "Connector of Real input signal" Parameter Integer nout=2 "Number of outputs" Typically the number of inputs/outputs is then given by a parameter to that component.įor example, the following component has one input but 2 outputs, varied with the parameter nout: model SIMO "Single input, multiple output" It is possible to define a Modelica component that has a variable number of inputs/outputs. The limitation you quote is not a general limitation of Modelica. ❺nyone here can confirm or deny this? ¿Is this a limitation inherent in all Modelica enviroments? ¿or it is an implementation limitation on this particular library?Īnd, going back to the original aim of this question: Is there a less expensive way (than System Modeler) to do this in Mathematica, without System Modeler? To be defined and added to the library before it can be used. Also (again,Īs I understand it), every separate equation requires its own symbol Modelica symbol from one with one inflow and 2 outflows. ForĮxample, a stock with one inflow and one outflow requires a different System Dynamics symbol requires its own entry in the library. The downside, as I understand it, is that each different use of a These elements help describe how even seemingly simple systems display baffling nonlinearityĪpperently I should be able to this with System Modeler by loading this modelica library but I am also told here that: What makes using system dynamics different from other approaches to studying complex systems is the use of feedback loops and stocks and flows. It deals with internal feedback loops and time delays that affect the behaviour of the entire system. System Dynamics is an approach to understanding the behaviour of complex systems over time.
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