| 1. |
- Edström, Krister, et al.
(författare)
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Aspects on Simulation of Switched Bond Graphs
- 1996
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Ingår i: Proceedings of the 35th IEEE Conference on Decision and Control. - Linköping : Linköping University Electronic Press. - 0780335902 ; , s. 2642-2647 vol.3
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- By mode-switching systems we mean physical systems characterized by transitions which are at least an order of magnitude faster than the overall time-scale. There are essentially two different ways to model such systems for simulation. One is to employ continuous models and stiff solvers. This approach is becoming more feasible as more sophisticated stiff solvers become available, but still suffers from poor performance for larger models. An alternative approach is to employ hybrid models with instantaneous transitions between continuous mode-model, In this case solvers capable of detecting zero-crossings are required. The advantage of this approach is an improved simulation performance but the disadvantage is that one has to deal with more complex models. To handle the model complexity matter we have previously proposed switched bond graphs as a solution. Employing switched bond graphs, the problem of complex models is modified to the problem of translating the bond graph to a computational model. This is the problem addressed here.
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| 2. |
- Edström, Krister, et al.
(författare)
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Modelling and Simulation of a Switched Power Converter
- 1996
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- In our earlier work dealing with switched systems we have focused on the conceptual and formal side of the modelling process. In this paper we go one step further and illustrate the practical generation of simulation code from a switched bond graph. The principles are illustrated by means of an industrial switched power converter used to control the power of electric rotary machines. We describe an implementation of the formal Mode Transition System (MTS) presented earlier. The format proposed is referred to as Mode Transition File (MTF) format. We present an algorithm to generate the mode transition file from a switched bond graph. Finally we illustrate how this file format can be converted to code for the well known DASSRT solver.
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| 3. |
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| 4. |
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| 5. |
- Strömberg, Jan-Erik, et al.
(författare)
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Bond Graph Supported Estimation of Discretely Changing Parameters
- 1993
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Ingår i: International Conference on Bond Graph Modeling, 1993. - 9781565550193 - 1565550196 ; , s. 47-52
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- A key factor in parameter estimation is the selection of model structure within which the fit to observed data is to be achieved. For linear systems, bond graphs have proven to give excellent support in this respect. However, for systems undergoing abrupt transitions between different (linear) modes of behaviour, the situation is far more complex. To handle this, we exploit the features of the ideal switching element as introduced by Strömberg, Top and Söderman. This solves the question of physical modelling as well as how to derive the supporting information. The approach is demonstrated on a non-trivial example using a multiple Kalman filter estimator.
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| 6. |
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| 7. |
- Strömberg, Jan-Erik, et al.
(författare)
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Conceptual Modelling of Hybrid Systems
- 1994
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Ingår i: Proceedings of the 1994 European Simulation and Modelling Conference. - Linköping : Linköping University. ; , s. 1095-1099
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Rapport (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Strömberg, Jan-Erik, et al.
(författare)
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Modelling and Simulation of a Switched Power Converter
- 1997
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Ingår i: Proceedings of the Third International Conference on Bond Graph Modeling and Simulation. - 1565551036 ; , s. 195-200
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Konferensbidrag (refereegranskat)abstract
- In our earlier work dealing with switched systems we have focused on the conceptual and formal side of the modelling process. In this paper we go one step further and illustrate the practical generation of simulation code from a switched bond graph. The principles are illustrated by means of an industrial switched power converter used to control the power of electric rotary machines. We describe an implementation of the formal Mode Transition System (MTS) presented earlier. The format proposed is referred to as Mode Transition File (MTF) format. We present an algorithm to generate the mode transition file from a switched bond graph. Finally we illustrate how this file format can be converted to code for the well known DASSRT solver.
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| 10. |
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