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Real-time Simulation

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Continuous System Simulation

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In this chapter, we shall discuss the special requirements of real-time simulation, i.e., of simulation runs that keep abreast of the passing of real time, and that can accommodate driving functions (input signals) that are generated outside the computer and that are read in by means of analog to digital (A/D) converters.

Until now, computing speed has always been a soft constraint — slow simulation meant expensive simulation, but now, it becomes a very hard constraint. Simulation becomes a race against time. If we cannot complete the computations associated with one integration step before the real-time clock has advanced by h time units, where h is the current step size of the integration algorithm, the simulation is out of sync, and we just lost the race.

Until now, we always tried to make simulation more comfortable for the user. For example, we introduced step-size controlled algorithms so that the user wouldn’t have to worry any more about whether or not the numerical integration meets his or her accuracy requirements. The algorithm would do so on its own. In the context of real-time simulation, we may not be able to afford all this comfort any longer. We may have to throw many of the more advanced features of simulation over board in the interest of saving time, but of course, this means that we have to understand even better ourselves how simulation works in reality.

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(2006). Real-time Simulation. In: Continuous System Simulation. Springer, Boston, MA. https://doi.org/10.1007/0-387-30260-3_10

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  • DOI: https://doi.org/10.1007/0-387-30260-3_10

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-0-387-26102-7

  • Online ISBN: 978-0-387-30260-7

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