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Libraries Parameters Initial values Time settings Other environments Model Translation Translated model Dymosim simulation Plotting --------------------------------------------------------------------------------------------------------------------- Figure 8: The Dymola modeling environment, (Dynasim AB) Command scripts are small text scripts where common commands can be written, saved and then executed all together, every time the script is run (similar to an m-file in Matlab). The models are composed of several small blocks representing physical things like pipes, compressors and turbines. Each block has its equations governing the states of the block and the algebraic equations. When combining these blocks the equations must also be combined, but there are different options on how to do it. In Matlab/Simulink it is necessary to rewrite all equations according to one fixed flow order as ordinary differential equations (ODE). The equations can also be said to be in state-space form: x& = f ( x ) The system has well-defined inputs, outputs and states. This is a non-trivial exercise and often time-consuming. The equations also tend to lose their specific physical representation. Another option is to use non-causal modelling, which means that the equations are written in a natural form as a system of differential-algebraic equations: f ( x , x& , y ) = 0 where x is the vector of unknowns that appear differentiated in the equation and y is the vector of unknowns that do not appear differentiated. Dymola has a powerful tool that automatically rewrites the equations to the desired ODE form. In this way the equations can be kept in separated blocks, so that the physical representation remains. A drawback with this method is that it gets 17 Model Editor (code) - Model composition - Default parameter setting - Definition of equations Dymola main window - Parameter settings - Initial Value settings - Simulation setup - Command scriptsPDF Image | Modelling of Microturbine Systems
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