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Winter Design Review -NRCan
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Winter Design Review -NRCan

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  • show the WB applied to each partFinite element analysisMeshing considerationsFEA is done using ANSYSDifferent workbenchesAnd how these workbenches will be applied by Structures group
  • Show the pics of the half casing, just the meshed surface
  • Transcript

    • 1. Structures
      Kamal Mahmud
    • 2. Personal Responsibilities
      Casing stress analyses
      Static
      Thermal
      Burst
      Casing design
      Based on the stress results
    • 3. FEA and ANSYS
      Finite element analysis (FEA) using ANSYS 12.1
      CAD modelling using Pro/E v3, v5
      Linear and non-linear, steady-state and transient analyses
      Types of analyses:
      Static Structural
      Thermal
      Vibration
      Explicit Dynamics
    • 4. Casing Design
      Design modifications
      2009/10 Model
      2010/11 Model
    • 5. CAD Model Difficulties
      Complex features
      Swept blend
      File transfer difficulties
      Defeaturing
      Include final pic & caption
      Defeatured casing
      Final casing
    • 6. Challenges Faced
      File compatibility
      Defeaturing problem
      Redesigning
      Advanced options
      Partitioning (slice)
      CAD repair
      Meshing
      Patch independent
      Tetrahedral and sweep
    • 7. Flow Path
    • 8. Stress Analysis
      CF8C Plus as material
      Yield stress = 300 MPa
      Static and thermal stress analysis
      Simulate extreme case scenario
      Operational pressures and temperatures
      Von-Mises stress and deformation
      Analytical calculation and validation
    • 9. Static Stress – Extreme Case
      25 MPa uniform pressure – extreme case
      Used for most analyses
      Validation analytically
    • 10. Thermal Stress – Extreme Case
      25 MPa pressure and 750°C temperature
    • 11. Thermal Stress - Operational
      Varying pressure and temperature at different sections
      Redesigning may be
      required
    • 12. Modal Analysis
      Pre-stress modal analysis
      Static and thermal stress
      Operating speed = 9720 rpm
      Structurally safe
      Mode 1 = 6500 rpm
      Mode 2 = 7200 rpm
      Mode 3 = 10300 rpm
    • 13. Burst Analysis and Research
      Explicit Dynamics workbench
      Turbine rotor at 9720 rpm and 12700 rpm
      Tri-hub rotor burst
      Casing thickness determined analytically
      Energy based calculation
      MIT report “Finite-Element Analysis of Simulated Rotor-Fragment Impacts Against Rings & Beams Compared with Experiments” [1]
      [1] J.J.A Rodal et al., Aeronautics and Astronautics department, MIT, 1965
    • 14. Burst Analysis Video
      This video is uploaded separately in my linkedin profile
    • 15. Future Work
      Casing stress analysis
      Casing redesign
      Lessons learned from 2010/11
      CAD model with minimum imperfections
      Detailed design
      Assembly procedure
      Burst analysis
      Advanced techniques
      Simulation for different failure modes
    • 16. Questions?
      Thermal
      Complete Stress
      Modal
      Burst