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Collaborative development and cataloguing of simulation and calculation models for space systems

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Presentation delivered at the 3rd IEEE Track on …

Presentation delivered at the 3rd IEEE Track on
Collaborative Modeling & Simulation - CoMetS'12.

Please see http://www.sel.uniroma2.it/comets12/ for further details.

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  • 1. www.DLR.de • Chart 1 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Collaborative Development and Cataloging ofSimulation and Calculation Models forSpace SystemsDaniel LüdtkeJean-Sébastien Ardaens, Meenakshi Deshmukh,Rosa Paris Lopez, Andy Braukhane, Ivanka Pelivan,Stephan Theil, Andreas Gerndt
  • 2. www.DLR.de • Chart 2 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Modeling in Space System Development
  • 3. www.DLR.de • Chart 3 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Outline• Space System Development• Modeling in Space System Development• SimMoLib – Simulation Model Library • (Collaborative) Model Development • Guidelines and Best Practices • Ensuring Quality • Software System• Conclusions and Outlook
  • 4. www.DLR.de • Chart 4 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Space System Development Source: TSTI
  • 5. www.DLR.de • Chart 5 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Models Involved During Development ECSS space mission life-cycle
  • 6. www.DLR.de • Chart 6 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Observations on Model Use• Many different models with a large variety of tools• Projects run for a very long time• Many domains• Number of realized projects is low• Models of later phases tend to be very specific• Many departments involved• High staff turnover• Reuse across project or department borders is rare
  • 7. www.DLR.de • Chart 7 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Simulation Model Library Source: Alexandre Dulaunoy http://www.flickr.com/photos/adulau/5043219979/ , CC-BY 2.0
  • 8. www.DLR.de • Chart 8 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012 Simulation Model Library • Aim: enabling reuse of simulation and calculation models within DLR • Creating a library of high quality models and stimulate sharing Sharing Reuse V&VCollaboration Reviews Model Linking Metadata Social Modeling Model Software Model Aspects Platforms Documentation Guidelines Support
  • 9. www.DLR.de • Chart 9 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Model Development Process• Process presented by Volker Schaus et al. at CoMetS‘11• Simplified and adopted for SimMoLib
  • 10. www.DLR.de • Chart 10 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Model Platforms Model Platforms• Project partners are mainly working with• Calculation models in early phases• Simulink simulation models in all development phases• Extension to other platforms later
  • 11. www.DLR.de • Chart 11 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012 ´s Modeling Guidelines Modeling• Common guidelines to ensure quality Guidelines• Ease reuse for partners with different • development • implementation styles • testing philosophies• Guidelines include rules and best practices for • common to all model types • specific for different model types (Simulink vs. Excel)• Based on well-known standards• Balanced between too restricting and too open
  • 12. www.DLR.de • Chart 12 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Documentation Templates Model Documentation• Help developers to provide proper documentation• Based on model development process• All necessary information in one document• Important part: Knowledge Model • provides theoretical background • references to literature • reuse possible on other platforms• Different templates for different platforms
  • 13. www.DLR.de • Chart 13 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Model Validation, Verification, and Testing V&V• Validation: Does the model represents the physical system sufficiently? • Was the right model developed?• Verification: Does the model fulfill the formal requirements? • Was the model correctly developed?• Large range of models and platforms → no explicit guidelines for validation• SimMoLib does not ask for formal requirements → no mandatory verification process• Guidelines to raise awareness and necessity of V&V• 2 automated test frameworks for Simulink • unit test approach; report generation• Excel: best practices and strategies
  • 14. www.DLR.de • Chart 14 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Quality• Quality of models? • Correctness • Parametrizability • Documentation • Application of guidelines • …• How to measure quality of models?• How to visualize quality?• Can low-quality models still be reused?• How to motivate users to share their models? Source: amazon.com
  • 15. www.DLR.de • Chart 15 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012 ´s Review Process Reviews• Inspired by peer review for scientific publications• 4 topics, 4 questions each: • Documentation • Testing • Parameterization • Model Flexibility• Answers: • yes • yes, but not sufficiently • no • not applicable• Additional free text comments• Developers are also asked to assess their models
  • 16. www.DLR.de • Chart 16 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012 - The Software Model Software Platforms Support
  • 17. www.DLR.de • Chart 17 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012
  • 18. www.DLR.de • Chart 18 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012 ´s Metadata Framework Model Metadata Platforms• Complex metadata model implemented• Different information for different modeling platforms• Dynamic behavior of metadata wizards• Developed metadata description language (DSL) with code generators
  • 19. www.DLR.de • Chart 19 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Collaborative Model Development Collaboration• SimMoLib enables collaborative development of models• Simplified interface to a version control system Software• Development still in modeling tools• SimMoLib handles management of files Support• Files can be “locked” to prevent conflicts• Models can be “released”• Before releasing a model, only invited developers have access
  • 20. www.DLR.de • Chart 20 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Conclusions• SimMoLib… • addresses model life cycle • promotes reuse • preserves knowledge • provides guidelines and best practices during development • supports collaborative development • is open for any calculation and simulation platform• Balancing act between • simplicity of contribution • strict guidelines and processes
  • 21. www.DLR.de • Chart 21 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012 ´s Future• Current activities include… • Improvement of software and guidelines • Evaluation of full-feature web clients • Additional modeling platforms • Integration into modeling platforms • How to motivate model sharing? • “Soft Links” between models? • “Customers Who Bought This Item Also Bought…” • “Model A replaces Model B”• Extending to other domains
  • 22. www.DLR.de • Chart 22 > SimMoLib@CoMetS12 > Daniel Lüdtke > 26/06/2012Daniel LüdtkeSoftware for Space Systems and Interactive VisualizationSimulation and Software TechnologyGerman Aerospace Center (DLR)Cologne / Braunschweig / Berlin - GermanyEmail: daniel.luedtke@dlr.dewww.dlr.de/sc/en

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