NDLI: QSS and multi-rate simulation of object-oriented models

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QSS and multi-rate simulation of object-oriented models

QSS and multi-rate simulation of object-oriented models

Content Provider	ACM Digital Library
Author	Casella, Francesco Bergero, Federico Ranade, Akshay
Abstract	Object-Oriented (O--O) languages like Modelica allow the description of multi-domain dynamical models. These models represent a Differential Algebraic Equation (DAE) that is usually converted to an Ordinary Differential Equation (ODE) formulation and simulated using numerical integration methods. Most Modelica tools include Single-Rate integration methods based on time discretization. Recently developed ODE numerical integration methods like Quantized State Systems (QSS) and Multi-Rate algorithms have some features (sparsity exploitation, efficient stiffness handling, efficient integration of loosely coupled systems of equations) that makes them suitable for many applications. By their nature, efficient implementation of these methods requires a different perspective on the model than classical methods, thus it is not a trivial task to implement them in Modelica tools. The Functional Mock-up Interface (FMI) is a tool independent standard for model exchange and co-simulation. Models are exchanged as compiled binaries (Functional Mockup Unit - FMU) with an API that allows the evaluation and simulation of the model. The FMU presents the model as a hybrid ODE on which numerical integration methods (such as Euler, Runge-Kutta) are applied for simulation. In this article we propose an extension to the FMU API to allow QSS and Multi-Rate simulation of O--O oriented models by means of FMI Model-Exchange. This extension opens up the possibility of testing and fine tuning QSS and Multi-Rate algorithms on a wide range of system models. Some results obtained with a prototype implementation on two example cases are reported.
Starting Page	69
Ending Page	77
Page Count	9
File Format	PDF
ISBN	9781450342025
DOI	10.1145/2904081.2904091
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-04-18
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Quantized state system Functional mock-up interface Model exchange Multi-rate integration methods
Content Type	Text
Resource Type	Article

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