siemens.com/answers© Siemens AG 2013 – All rights reserved.Parametric Surface Modelling forRapid Shell Mesh Setup ofRailwa...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinAGEN...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinSiem...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHAT...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHAT...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHY?...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHY?...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHY?...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinConc...
© Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinQues...
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Parametric Surface Modelling for Rapid Shell Mesh Setup of Railway Vehicle Car-bodies

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Parametric Surface Modelling for Rapid Shell Mesh Setup of Railway Vehicle Car-bodies

  1. 1. siemens.com/answers© Siemens AG 2013 – All rights reserved.Parametric Surface Modelling forRapid Shell Mesh Setup ofRailway Vehicle Car-bodiesAltair Technology Conference 2013, Turin, ItalyDI T. Grausgruber*C. EckerDr M. SeitzbergerSiemens Rail SystemsUrban Transport Vienna2013-04-24
  2. 2. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinAGENDA What? Introduction of railway vehicle car-bodies Why? Motivation and objectives How? „FastFE“ process description Features of the CAD surface model Automated FE preparation in HyperMesh Conclusions2013/04/24Page 2
  3. 3. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinSiemens Infrastructure & Cities sector2013/04/24Page 3
  4. 4. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHAT?Railway vehicles – car-bodiesMain load carrying mechanical structure = car-body (e.g. aluminium metro)Made of thin walled extrusions and/or sheet metal  FE shell meshes2013/04/22Page 4
  5. 5. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHAT?Exemplary modifications of the car-body2013/04/22Page 5
  6. 6. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHY?(1) Automated midsurface generation fails2013/04/22Page 63D volumes ofalu extrusions(length ~20m)auto-midsurfacesmidsurfaces forFE analysis
  7. 7. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHY?(2) Reduction in lead time2013/04/22Page 7
  8. 8. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinWHY?(3) Reducing costs2013/04/22Page 8
  9. 9. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?„FastFE “ process description2013/04/22Page 9Efficient Modification of Global Parameters• width, height, length of car-body• distance between pivots, tapering• side wall type (straight, contoured, ...)• positions and dimensions of windows• positions and dimensions of doors• profile cross-sections, ...Automated Setup of FE Model• import and geometry cleanup• create materials and physical properties• mirror model (exploiting symmetries)• enforce surface connectivity• automated mesh generation• create entity sets
  10. 10. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?Key aspects of CAD midsurface implementationParameterized CAD surface model represents midsurface geometry Assembly hierarchy with strict top-down reference structure Global parameters in sketches control propagated reference entities Local features and sketches to create geometry in subassemblies fix and flexible zones of the design are defined foresightfully Wide range of efficient modification possibilities Parameter alteration (e.g. dimensions, No. doors/windows, …) Change of design principle (e.g. sidewall type, longitudinal floorextrusions  transverse)2013/04/24Page 10
  11. 11. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?CAD surface model: Top-down reference structure2013/04/22Page 11
  12. 12. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?CAD surface model contains FE information FE data via colour definition of faces and lines: sheet thickness material assignment areas for creation of loads and boundary conditions Models contain abstraction issues: ready to mesh with shell elements2013/04/24Page 12
  13. 13. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinHOW?Automated FE model setup in HyperMeshHyperMesh scripting for perfoming the following tasks: Create assembly hierarchy, materials, physical properties and entity sets decode colour information (e.g. sheet thickness, beam diameter, …) Exploit geometrical symmetry by mirroring a quarter or half model create front/back and left/right load and boundary condition entities Enforce surface connectivityAfter model setup checks and occasionally minor fixes Run automesher Perfom model checks, ballasting and load/boundary condition matching Export solver input deck and include loads and boundary conditions Ready to run FE solver input deck2013/04/24Page 13
  14. 14. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinConclusions Soft-coupled CAD-CAE approach to generate FE shell meshes of car-bodies Versatile CAD template midsurface models: already contain abstraction issues use sophisticated parameterization  very fast project derivation already contain necessary FE information on surfaces and lines Efficient automated setup of high quality FE shell meshes in HyperMesh Method enables a change from traditional design driven analysis to ananalyis driven design Successfully applied in the concept stages of several Siemens railwayprojects2013/04/24Page 14
  15. 15. © Siemens AG 2013 – All rights reserved.Infrastructure & Cities Sector, Rail SystemsGrausgruber et al. ATC 2013, TurinQuestions?2013/04/24Page 15Thank you foryour attention!

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