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Porfolio_Khoa Ton

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Transcript

  • 1. PORFOLIO
    KHOA TON
    Master in Mechanical Engineering
    San Jose State University
    Specialize in Mechanical Design/FEA/CFD
  • 2. Project
    DESIGN APPROACH TO LOW SPEED SUBSONIC WIND TUNNEL (team member)
    OPTIMIZATION OF FINESS RATIO OF VLLA AIRSHIP (team leader)
    WHEEL DESIGN (own project)
    CAN CRUSHER design (own project)
    REDESIGN A BREMBO GT BRAKE (380mm x 32mm) FOR A 2002 BMW M5 SPORT SEDAN (team leader)
    FOUR DEGREE OF FREEDOM MECHANISM (team member)
    Enclosure design for a three-wheel electric scooter (own project in progress)
  • 3. 1. DESIGN APPROACH TO LOW SPEED SUBSONIC WIND TUNNEL
  • 4.
  • 5. 2. OPTIMIZATION OF FINESS RATIO OF AN AIRSHIP
    Optimize the shape of the airship by varying finesse ratio (L/D) to meet requirement of cabin size and minimum drag.
    Benchmark theoretical drag against CFD-based drag
    Airship with the cabin size
  • 6. Topology
    3D Meshing
    Boundary Condition
  • 7. Total Pressure
    Velocity
    CFD based Drag Force
    Theoretical Drag Force
  • 8. 3. WHEEL DESIGN
    Blade Collection Motor-bike Wheels
  • 9. 4. CAN CRUSHER
  • 10. Von-Mises Stress
    Max Displacement (0.525 mm)
    Safety Factor
    Strain
  • 11. 5. REDESIGN A BREMBO GT BRAKE (380mm x 32mm) FOR A 2002 BMW M5 SPORT SEDAN
  • 12. REDESIGN A BREMBO GT BRAKE (380mm x 32mm) FOR A 2002 BMW M5 SPORT SEDAN
    Objective: Weight reduction by redesign the rotor hat
    Original rotor hat
    Cyclic Symmetry Model
    Optimize rotor hat
    Displacement (max 0.0077 mm)
    Von Mises Stress 17.4 MPa
  • 13. Thermal Analysis
    Rotor Disc
    Tmax649 F
    Rotor Hat
    Tmax605 F
  • 14. 6. FOUR DEGREE OF FREEDOM MECHANISM
    Feature & Specification
    Two translational & two rotational degrees of freedom
    All 4 DOF occurs on the same plate
    Springs provide preload for displacement in opposite directions
    2-2-2 Kinematic Kelvin mount
    Material is 6061-T6 Aluminum
    Vacuum compatible material; low out-gassing rate
    Easy to machine
    Cheap
    Mass is ≤ 2 Kg
    Dimension is 154 mm x 200 mm x 200 mm
  • 15. Design Requirements Vs. Results
    • Design a 4 DOF Mechanism
    • 16. Position a 50-mm cube having 0.5 Kg mass
    • 17. Provide clearance for a Ø10-mm light beam propagating from one surface of the 50-mm cube to beyond the 4 DOF mechanism
    • 18. Angular Range ≥ 20 mrad
    • 19. Translational Range ≥ 4 mm
    • 20. Resolution ≤ 5 μrad, ≤ 2 μm
    • 21. Accuracy (Repeatability) ≤ 10 μrad, ≤ 10 μm
    • 22. Pointing Stability over entire Operating Temp Range ≤ 12 μrad, ≤ 15 μm
    • 23. Fundamental Frequency ≥ 50 Hz
    • 24. Dimensions (to be minimized) ≤ 200 mm x 200 mm x 200 mm
    • 25. Mass (to be minimized) ≤ 5 Kg
    • 26. Detachable and replaceable to ≤ 10 μm & ≤ 100 μrad
    • 27. Survive 10 ºC < T < 30 ºC; Operate in 18 ºC < T < 22 ºC
    • 28. Mounting Surface Steel
    • 29. Vacuum compatible
    • 30. 38 mrad
    • 31. 4.2 mm
    • 32. Yes
    • 33. Yes
    • 34. 13 μm, negligible
    • 35. 51 Hz
    • 36. 154x200x200
    • 37. 2 kg
    • 38. Yes
    • 39. Yes
    • 40. Yes
    • 41. Yes
  • Plate Flexure Optimization
    Results:
    - m= 0.276 Kg
    • Plate thickness
    = 3.8 mm
    • Leaf flexure thickness
    = 1 mm
    • Outer joints = 10 mm
    • 42. Inner joints = 06 mm
    Y
    X
    X -displacement
    Y -displacement
    12/2010
  • 43. 12/2010
    Optimization conflicts to frequency test
    Inner leaf flexure
    Outer leaf flexure
  • 44. 12/2010
    Stress Analysis (Translation Displacement)
    Result:
    F=15 N
    X disp = 2.4 mm
    Stress= 118.3 Mpa
    F=15 N
    Y disp = 2.3 mm
    Stress= 126.9 Mpa
    Y
    X
    X -displacement
    Y-displacement
  • 45. 12/2010
    Stress Analysis (Angular Displacement)
    Pitch:
    F= 30 N
    Stress= 73.2 MPa
    X=0.0107 rad
    MOS= 0.734
    Y
    X
    Pitch
    Yaw:
    F= 40 N
    Stress= 92.9 Mpa
    Y= 0.01005 rad
    MOS= 0.6622
    Yaw
  • 46. 7. Enclosure design for a three-wheel electric scooter TRIKE III
    AFTER
    BEFORE
    Concept Design
    09/2010
  • 47. 3D Design Enclosure
    09/2010
  • 48. Result
    Pressure Distribution
    Velocity Distribution
    09/2010
  • 49. Structural Evaluation of The Enclosure
    Displacement Distribution
    Max disp = 0.45 mm
    Von-Mises Stress Distribution
    Max Stress = 0.9 Mpa
    (vs Yield = 55 Mpa)
    09/2010