MACHINE ELEMENTS

MACHINE ELEMENTS

ECTS credits: 6

Objectives:

Students should

a) acquire strong capacities in designing machines and machine elements particularly in the field of mechanical transmissions and aeronautical systems

b) be able to define the relevant materials and dimensions with regard to resistance, fatigue

c) have the capacity to improve existing designs if need be

d) be able to use CAD software for part design and assembly design

 

Syllabus:

Unit 1: Mechanical transmissions and gears

  •  Introduction to mechanical transmissions, comparisons between gears and belts, chains, CVT, hydraulic and electric transmissions
  • The law of gearing, various tooth profiles in gearing, focus on involute gears, introduction to gear manufacturing, the strength calculation methods, some basics about Noise and Vibration Harshness, efficiencies of gears and concludes with a simplified overview how to develop gears.
  • Hertzian contacts and gear lubrication.

 

Unit 2: Design of Machine elements: static loading, and variable loading, fatigue

  • Reminder on Strength of Materials, resistance criteria,
  • Theory of fatigue, Stress – Number of cycles (S-N) diagrams, Endurance diagrams, fatigue resistance criteria. Theory of cumulative damage
  • Transmission shaft design
  • Bearings, types of bearings, calculation of bearing loads, bearing life,
  • Assemblies with bolts and screws,
  • Interference fits, keys
  • Design of springs,
  • Belt transmissions, chain transmissions

 

Unit 3: Computer-Aided Design -– project

  • Fundamental basis knowledge of part design
  • Assembly design
  • Drafting
  • Project: CAD of a mechanical system, component design.