System Modeling, Simulation and Optimization
System modelling and simulation is a central research area for the division. The HOPSAN simulation package has been developed at the division since the late 1970s, and has played an important role in research projects over time. It has also been used widely in the industry. In recent years commercial software has become increasingly available, and those have also been used at the division. In 2009 the development of a new simulation platform, Hopsan NG, was initiated. This is an object-oriented C++ application with focus on multi-core support and compatibility. A beta version of this will be released in February 2011.
A very useful technique for simulation of large scale systems is the use of bidirectional delay lines (or transmission line modelling, TLM). This technique is used in the HOPSAN package to separate component and subsystems in each time step by introducing a physically motivated time delay, corresponding to wave propagation. This results in a linear relationship between system size and simulation time, and also provides very robust properties when large models are assembled from smaller parts. For example the numerical properties are always maintained, and no new numerical effects are generated when the components are connected.
High speed simulation can be used for simulation based system optimisation. This combination has proven very efficient and has been used in many projects since the early 1990s. Simulation models can also be used for design analysis, for example sensitivity analysis where the influence of parameter variations and uncertainties can be studied. Currently there is an ongoing project called High Speed Simulation for Product Design and Operation (HiPO), sponsored by SSF and ProViking. Hopsan NG is developed as a part of this project.
Last updated: 2011-04-11