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harder to understand the dependency of each variable and in what order they are calculated. The differences between the two methods can be seen in the following example: A motor drive is to be simulated and in Modelica each block can be assembled into the complete drive. Each block has its equations and connections to the surrounding blocks. It is very simple to understand what every block correspond to in the real world. Figure 9: A motor drive modelled in Modelica, (Dynasim AB) In Matlab/Simulink one cannot simply put the same blocks together. The equations need to rewritten manually and the model can then be constructed using new blocks, not necessarily with any physical representation, just like the gain block in the figure below. The gain block consists of the gearbox and the inertias of the motor and the load. Figure 10: A motor drive modelled in Matlab/Simulink, (Dynasim AB) 4.3 Modelica Modelica is an object-oriented language designed to allow convenient, component-oriented modelling of complex heterogeneous physical systems. Important parts of Modelica are the object-oriented structure and the non-causal modelling, which has been discussed in the Dymola section. For more detailed information see Modelica home page www.modelica.org. A free Modelica editor is available at http://www.et.dtu.dk/fme. 4.4 The ThermoFluid Library This library is developed at the department of Automatic Control at Lund Institute of Technology. The main purpose is to provide a general framework and basic building blocks for modelling thermo-hydraulic systems, written in the Modelica language. More information about the library can be found in Tummescheit (2002) or any of the references of Eborn et al. To provide a general and flexible framework, a library must emphasize the small blocks on the behalf of the more complex specific systems like a power plant. The basic design principles are as follows: 18PDF Image | Modelling of Microturbine Systems
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