Theory of Machines
 
 
Subject Code: EME2056
Aim of Subject: To provide the students with the elements of mechanics of machines.
Learning Outcome of Subject: At the completion of the subject, students should be able to :
  • Draw kinematic diagram of a mechanism.
  • Apply kinematic and kinetic theories to analyze practical mechanisms.
  • Understand when the Coriolis acceleration is present, and include it in the analysis.
  • Identify types of cams and cam followers and graphically construct cam profiles for various follower displacements.
  • Identify the different types of gears and calculate the characteristics of meshing gears.
  • Determine the kinematic properties of gear trains.
  • Classify and analyze governors.
  • Balance various types of machines.
  • Analyze machines under forced and free vibration.
  • Undertake, under supervision, laboratory experiments on balancing, transmission and vibration.
Programme Outcomes:
  • Ability to acquire and apply fundamental principles of science and engineering.(60%)
  • Capability to communicate effectively(10%)
  • Acquisition of technical competence in specialised areas of engineering discipline(10%)
  • Ability to identify, formulate and model problems and find engineering solutions based on a systems approach(10%)
  • Ability to work independently as well as with others in a team(10%)
Assessment Scheme:
  • Lab Experiments - work in groups, lab report writing, oral assessment at the end of lab (10%)
  • Tutorial / Assignment - group assignment,focus group discussion at tutorial,to enhance understanding of basic concepts in lecture(15%)
  • Test Quiz - written exam (15%)
  • Final Exam - written exam (60%)
Pre-Requisite: EME1076: Applied Dynamics or
ERT2016: Engineering Mechanics
Credit Hours: 3
Contact Hours: 54 hours (Laboratory,lectures and tutorials)
References:
  • C.E. Wilson and J.P. Sadler, "Kinematics and Dynamics of Machinery", Harper Collins Coll, 1993.
  • J.E. Shigley and J.J. Uicker, "Theory of Machines and Mechanisms", McGraw-Hill, 1995.
  • W.T. Thomson, "Theory of Vibration with Applications", Prentice-Hall, 1993.

Subject Contents

  • Dynamics of Mechanisms

    • Velocity and acceleration diagrams for mechanisms. Forces and accelerations in mechanisms. Four-bar linkages.
     
  • Cams

    • Classification of cams and followers. Cam design.
     
  • Governors

    • Types of governors. Power. Control and stability.
     
  • Balancing

    • Static and dynamic balancing. Balancing of rotary and reciprocating systems. Balancing of linkages.
     
  • Transmission

    • Belt drives and band brakes. Spur gearing. Gear trains. Epicycle gears.
     
  • Vibrations

    • Free undamped and damped vibration. Response of single degree of freedom systems to harmonic excitation. Vibration isolation and force transmissibility. Transient vibration. Measurements.
     

Laboratory

1: Balancing
2: Transmission
3: Vibration