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Modelica libraries for experimental tool-generic FMU import to solve the online-minimum problem (presented at the 17th meeting of the Modelica Users’ Group Saxony)

Home Page: https://tinyurl.com/lastlibfmu

License: BSD 2-Clause "Simplified" License

Modelica 67.50% Makefile 0.21% C 32.10% Gnuplot 0.19%
modelica fmi fmi-standard modelica-library

lastlib's Introduction

LastLib

Experimental Modelica library for tool-generic FMU import to determine the online-minimum of a transient variable. It was first presented at the 17th meeting of the Modelica Users’ Group Saxony.

Library description

LastLib consists of tool-specific Modelica wrappers for the imported Last.fmu to obtain the value of the last valid simulation step.

An overview of the library and early experiments is provided in

Thomas Beutlich. Experiments and an FMI Idea on the Online-Minimum Problem. Presentation given at the 17th Modelisax Meeting, Dresden, Germany, November 2017. URL: tinyurl.com/lastlibfmu.

Supported Modelica tools

  • Dymola (both Linux and Windows)
  • OpenModelica (with C runtime)
  • SimulationX

Example

The primary use-case of LastLib is the calculation of the online-minimum. The provided example model MinimumTest.Test demonstrates the usage of the LastLib within the minimum block MinimumTest.Minimum.

Minimum Plot

License

LastLib is released under the terms of the Simplified BSD License.

Acknowledgement

  • The Last.fmu is based on the FMU SDK.

Development and contribution

You may report any issues with using the Issues button.

Contributions in shape of Pull Requests are always welcome.

lastlib's People

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lastlib's Issues

Start value of the minimum

Hi,

Thanks for the great library! I noticed after the latest commit that the computation of the minimum does not start from the specified y_start value. See the screenshot bellow. I get this result on Linux OM v1.16.5.

image

Call to fmiTerminate

When a simulation crashes (due to external reasons), I get the following output:

[ERROR][Last] [error][FMU status:Error] fmiTerminate: Illegal call sequence.

I guess it's not really a big deal, but maybe you want to know about it.

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