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ENME307

Theory and Design of Machine Elements

Syllabus

  1. Basic Concept of Mechanism (4 hours)
    1. Kinematic links, kinematic pairs, and kinematic chain
    2. Mechanism and classification of mechanisms
    3. Inversions of mechanism
    4. Mobility
    5. Grubler criterion
    6. Grashof's law
  2. Cams (4 hours)
    1. Classification of cams and followers
    2. Terminology and definitions
    3. Standard motions of follower
    4. Cam profile synthesis for standard motions of follower
  3. Gears (6 hours)
    1. Classification of gears; terminology and definitions
    2. Gear tooth profiles; meshing of gear teeth
    3. Interference and undercutting
    4. Contact ratio and center distance
    5. Terminology and definitions of helical, bevel, and worm and worm gears
    6. Kinematics of helical, bevel, and worm and worm gears
  4. Gear Trains (5 hours)
    1. Classification of gear trains
    2. Speed ratio of gear trains
    3. Analysis of epicyclic gear trains: formula and tabular methods
    4. Torques in epicyclic gear trains
    5. All-wheel drive train
  5. Fundamentals of Machine Design (6 hours)
    1. Theories of failure for static loading
    2. Stress concentration and notch sensitivity
    3. Endurance limit and fatigue strength
    4. Characterizing fluctuating stresses
    5. Fatigue failure criteria for fluctuating stress
    6. Design for fatigue under fluctuating stress
  6. Shaft (7 hours)
    1. Shaft materials
    2. Shaft design for stress
    3. Shaft design for variable load
    4. Effect of stress concentration
  7. Spur Gear (6 hours)
    1. Gear materials
    2. Beam strength of spur gear tooth
    3. Dynamic load on gear
    4. Wear strength
    5. Design of a gear mesh
  8. Belt (7 hours)
    1. Belt drives
    2. Belt materials
    3. Design of flat belt and V-belt

Practicals

  1. Design Project I: introductory design project combining the design process with required analysis and drawing for communication of results, with justification of decision-making
  2. Design Project II: advanced machine design systems project using a team approach, with planned work division, deadlines, detailed drawings and (if appropriate) oral presentations

Evaluation

Final exam questions cover all chapters. Approximate marks distribution (total 60 marks over 45 hours):

  1. Basic Concept of Mechanism: 6 marks
  2. Cams: 4 marks
  3. Gears: 8 marks
  4. Gear Trains: 7 marks
  5. Fundamentals of Machine Design: 8 marks
  6. Shaft: 9 marks
  7. Spur Gear: 9 marks
  8. Belt: 9 marks