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)
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
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
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
42. Inner joints = 06 mmY 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
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