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
  • Winter Design Review -NRCan

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

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