Generation of Functional Mock-up Units from Causal Block Diagrams - - PowerPoint PPT Presentation

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Generation of Functional Mock-up Units from Causal Block Diagrams - - PowerPoint PPT Presentation

Feb 07, 2023 355 likes •626 views

Generation of Functional Mock-up Units from Causal Block Diagrams Bavo Vander Henst Bavo.VanderHenst@student.uantwerpen.be University of Antwerp Overview Functional Mockup Interface Starting point Flattening Optimization

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Generation of Functional Mock-up Units from Causal Block Diagrams

Bavo Vander Henst Bavo.VanderHenst@student.uantwerpen.be University of Antwerp

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Overview

Functional Mockup Interface Starting point Flattening Optimization Functional Mockup Unit Experiment

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Overview

Functional Mockup Interface Starting point Flattening Optimization Functional Mockup Unit Experiment

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FMI[1]

Functional Mockup Interface:

  • FMI for Model Exhange
  • FMI for Co-Simulation

[1] T. Blochwitz, M. Otter, M. Arnold, C. Bausch, C. Clauss, H. Elmqvist, et al., The functional mockup interface for tool independent exchange of simulation models, in: Modelica’2011 Conference, March, 2011, pp. 20–22.

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Model Exchange

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Co-Simulation

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Overview

Functional Mockup Interface Starting point Flattening Optimization Functional Mockup Unit Experiment

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Causal Block Diagram

Framework in Python

  • Base Block
  • CBD block
  • Linear Blocks
  • Delay Blocks
  • In and output blocks
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Causal Block Diagram

Simulator

  • Dependency graph
  • Sorted list of components
  • Strong components
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Overview

Functional Mockup Interface Starting point Flattening Optimization Functional Mockup Unit Experiment

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Flattening

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Flattening

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Flattening

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Overview

Functional Mockup Interface Starting point Flattening Optimization Functional Mockup Unit Experiment

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Optimization

Collapse Blocks

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Optimization

Constant folding Special Cases

  • 0 as input for adder
  • 0 as input for product
  • 1 as input for product
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Overview

Functional Mockup Interface Starting point Flattening Optimization Functional Mockup Unit Experiment

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Generate the Functional Mockup Unit

Functional mockup Unit:

  • XML-file
  • C-code
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Functional Mockup Unit

XML File

  • Model description
  • Model variables
  • (Solver details)
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Functional Mockup Unit

C-code

  • Based on SDK[2]
  • Subset of functions

[2] https://www.qtronic.de/en/fmusdk.html

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Functional Mockup Unit

C-code

  • variables array
  • setStartValues()
  • getReal()
  • ComputeVariables()
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Overview

Functional Mockup Interface Starting point Flattening Optimization Functional Mockup Unit Experiment

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Experiment

http://www.mathworks.nl/products/sl-design-optimization/examples.html;jsessionid =adb4c4c1b04e528081653e6d1a56?file=/products/demos/shipping/sldo/f14_estim.html

F14

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Experiment

Model of F14 Mean computation Time (s) Number of Blocks Python Not optimized 9.96355 140 Optimized 8.570786 116 FMU Not optimized 0.012619 140 Optimized 0.009318 116

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Questions?

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Conclusion