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Modeling Structural - Dynamics Systems in MODELICA/Dymola, - - PowerPoint PPT Presentation
Modeling Structural - Dynamics Systems in MODELICA/Dymola, - - PowerPoint PPT Presentation
Modeling Structural - Dynamics Systems in MODELICA/Dymola, MODELICA/Mosilab and AnyLogic Felix Breitenecker, Gnther Zauner, Daniel Leitner Working task Given: The problem definition of the constrained pendulum like in ARGESIM Comparison
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Problem definition
- What is standard in advanced modeling
and simulation?
- Where are the problems?
- How to deal with them?
- Is there a standard test example?
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Constrained pendulum
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Basic formulars
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Simulator - Dymola
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Simulator - Mosilab
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Simulator - AnyLogic
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Solution methods
- Algorithm section
- Parameter state event
- Model switching
– two instances of one model – two separate submodel definitions
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Algorithm section
Benefits:
- Modelica standard notation (Dymola,
Mosilab, OpenModelica, …)
- Fast modeling
Disadvantages:
- No graphical interface
- Limited applicability
algorithm if (phi<=phipin) then length:=ls; end if; if (phi>phipin) then length:=l1; end if;
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Parameter state event
Simulator includes the option statechart in the model desription interface;
- Textual (in Mosilab directly, in AnyLogic
- nly in Java)
- Graphical (both simulators in UML)
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Model switching
Constrained Pendulum
Long Short shorten lengthen start
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Model switching
Constrained Pendulum
Pendel 1 Pendel 2 shorten lengthen start
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Results
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Results
No influence Step size 0.001 6.725 AnyLogic IDA Dassl
- Min. step 1e-6
- Max. step 0.08
6.7224 Mosilab/Modelica Parameter switching
- Impl. Trapez
- Min. step 1e-6
- Max. step 1e-4
6.7199 Mosilab/Modelica Pure Modelica IDA Dassl
- Min. step 1e-6
- Max. step 0.08
6.7204 Mosilab/Modelica Switch models Dassl 500 intervals 6.72198 Dymola/Modelica
Method Time point Simulator
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Conclusion
- What is standard in advanced modeling and simulation?
- Modelica standard for model exchange
- UML
- combination of both
- Problems in solution generation:
- limited state event handling (Dymola)
- restriction in the choose of simulation methods
(Mosilab)
- no state event finding, fixed solution method (AnyLogic)
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