Methods for Tearing Systems of Equations in Object-Oriented Modelling. Describes a technique to define structural information in a component library. Keynote Address, Proceedings ESM'95, European Simulation Multiconference, Prague, Czech Republic, 5.-8. Proposes to discretize a model in the modeller and not in the integrator, because the modeller has more detailed information on all the equations and is able to utilize this knowledge to solve the linear systems of equations in the integrator more efficiently. Relaxing - A Symbolic Sparse Matrix Method Exploiting the Model Structure in Generating Efficient Simulation Code.
Examples are discrete controllers, friction, impact, ideal diodes, ideal thyristors, phase changes.
PhD. Thesis, University of London. Models hybrid systems by DAEs for the continuous part and by sets of finite automatas for the discrete part of physical models. Object-Oriented Modelling of Hybrid Systems. Keynote Address, Proceedings ESS'93, European Simulation Symposium, Delft, The Netherlands, Oct. 25.-28., pp. Introduces higher level elements to describe discrete components.