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Simulating hybrid dynamic systems

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4 Author(s)
C. A. Rabbath ; Defence Res. & Dev. Canada-Valcartier, Val-Belair, Que., Canada ; M. Abdoune ; J. Belanger ; K. Butts

This article presents the problem of inaccuracy involved in the conventional simulations, at fixed time steps, of event-based systems and then proposes the use of a new Simulink toolbox, known as the RT-events blockset, to significantly reduce the error between simulated and actual event-based systems. We present the conventional techniques used in the fixed step-size simulations of the basic integrator block with reset performed in between the iteration steps. Among the issues discussed is the adverse phenomenon known as reset walk. We also propose a new set of tools in the form of the RT-events blockset. The important blocks of the RT-events blockset are succinctly explained, and three numerical examples illustrating the effectiveness of the new simulation tools are given, including a closed-loop V-6 engine system

Published in:

IEEE Robotics & Automation Magazine  (Volume:9 ,  Issue: 2 )