MECH324 - Final Exam Review Topics

reading assignments covered: Chapters 8, 10, 11, 12, 15
(see the syllabus for section details)
  1. cams
    1. motion profiles (rise, dwell, fall)
    2. timing diagrams
    3. s-v-a-j diagrams
    4. relationships between shaft angle and time quantities
    5. fundamental law of cam design
    6. polynomial functions
      1. order (n)
      2. critical extreme position (CEP) conditions
      3. coefficient equations
      4. segment duration (β)
      5. camshaft angle vs. segment angle
    7. sizing a cam
      1. base and prime circles
      2. pressure angle
      3. eccentricity
      4. roller-follower pitch curve radius of curvature requirement
      5. undercutting
      6. flat-faced follower radius of curvature requirement
    8. cam-follower terminology
      1. oscillating, translating
      2. joint closure (force-closed, form-closed, conjugate)
      3. cross-over shock
      4. follower jump (valve float)
      5. follower types (roller, mushroom, flat-faced)
      6. cam types (radial, axial)
    9. standard motion segments
      1. double dwell vs. single dwell
      2. conclusions from Figure 8-18 and Figure 8-19
      3. 3-4-5, 4-5-6-7, 4-5-6-7-8 polynomials
      4. converting a rise function to a fall function
  2. 4-stroke engine terminology
    1. intake, compression, power, exhaust strokes
    2. valve timing
    3. crankshaft and camshaft speed relation
  3. dynamics fundamentals
    1. parallel axis theorem
    2. calculating the CG and mass moment of inertia of a subdivided geometric part
    3. radius of gyration
    4. center of percussion
  4. dynamic force analysis of linkages
    1. vector notation
    2. equations of motion for a link
    3. relative and total acceleration (e.g., for link 3 CG)
    4. matrix form of equations of motion for a link
    5. determining inputs for 4-bar linkage analysis (per Figure 11-3a and Figure 11-3b)
    6. interpreting results from Equation 11.9
    7. flywheel basics
  5. balancing
    1. rotor balancing (technique used for Lab 11)
      1. heavy spot, high spot, resonance
      2. 2nd order system amplitude and phase frequency response
      3. effects of calibration and correction masses
    2. static (single plane) balancing
    3. dynamic (double plane) balancing
    4. shaking force and moment
  6. cam dynamics
    1. force between the cam and the follower
    2. effects of spring preload
    3. how to prevent follower jump
    4. natural frequency, damping ratio, critical damping
  7. miscellaneous
    1. commonly missed questions and concepts from Exams I and II
    2. reading assignments
    3. homework assignments
    4. laboratory exercises