Publicerad: 2019-02-26
ISBN: 978-91-7685-148-7
ISSN: 1650-3686 (tryckt), 1650-3740 (online)
In this paper, a new method of importing FMUs (Functional Mock-up Unit) [1] to a multi-domain, mixed-mode simulator is presented. Supporting FMI (Functional Mock-up Interface) 2.0 for Model Exchange by converting an FMU to an HDL (Hardware Description Language) wrapper model not only takes advantage of the existing simulator capabilities, but also avoids a significant amount of work in the core of the simulator. The selected HDL in this paper is MAST which is used in both Saber and SaberHDL simulators [2][7]. To make the FMU import process easier, a general conversion utility, FMU2MAST, was developed which converts an FMU to a MAST model automatically. Two examples, bouncing ball and motor drive system are presented. With these two examples, three techniques used in this method are discussed: Accurate event detection in a variable time-step integration algorithm; Re-initialization of a state variable in MAST; and solving DAE (Differential Algebraic Equation) of a coupling FMUs system. This new FMU import method has been proved a success with 44 examples exported from five different tools.
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