Engineering Design I
 
 
Subject Code: EME2016
Aim of Subject: To provide a basic understanding of mechanical engineering design, and to introduce representative examples of solving practical engineering problems to specific machine components.
Learning Outcome of Subject: At the completion of the subject, students should be able to :
  • Understand basic mechanical design philosophy, scientific principles, methods, procedures, and applying them to achieve a designed goal. Choose material, and select appropriate safety factors to provide the required safety and reliability.
  • Obtain solution to practical problems involved stress concentration and notch sensitivity, using empirical knowledge, engineering conception and judgment. Understand the concepts of design under dynamic loads (Fatigue) and aware of fatigue phenomenon.
  • Understand the basic concept of tolerances, fits, basic hole system. Considering such information to dimension the designed components.
  • Knowing the various types of permanent and non permanent joints and their basic principles, performance characteristics, and applications. Learning about selection and construction details, calculation of loads, stresses, dimensions and factor of safety.
  • Understand basic principles of shaft and axle design, geometric and strength constraints, material selection, calculation of shaft dimensions, combined variable loads, critical speed
  • Understanding the nomenclatures, geometry and construction of various rolling element bearings, calculate the load capacity and life of rolling element bearings,
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:
  • Tutorial / Assignment - group assignment,focus group discussion at tutorial,to enhance understanding of basic concepts in lecture(20%)
  • Test Quiz - written exam (20%)
  • Final Exam - written exam (60%)
Teaching and Learning Activities: 47 hours (lectures,tutorials and laboratory experiment)
Credit Hours: 3
Pre-Requisite: EME1126: Engineering Graphics I
EME1066: Strength of Materials
References:
  • J.E. Shigley and C.R. Mischke, "Mechanical Engineering Design", 6th edition, McGraw-Hill, 2004.(Textbook)
  • R.l. Mott, "Machine Elements in Mechanical Design", Maxwell Macmillan, 2002.(Textbook)
  • R. C. Juvinall and K. M. Marshek, "Fundamentals of Machine Component Design", 3rd ed., John Wiley & Sons, 2000.
  • R. L. Norton, "Machine Design, An integrated Approach" 2nd ed. Prentice Hall, 2000.
  • M. F. Spotts and T. E. Shoup "Design of Machine Elements" 7th ed., Prentice Hall, 1998.

Subject Contents

  • Introduction to Mechanical Engineering Design

    • Mechanical design. Specifications and process. Basic considerations for the designer. Safety factor, Theory of failure for ductile and brittle materials. Simple and Combined stresses.
     
  • Mechanical Elements under Dynamic Loading

    • Characteristics of variable stresses. Stress concentration and notch sensitivity. Standard fatigue tests and stress-life relationship. Endurance limit and Fatigue strength. Modifying factors. Failure loci under variable stresses, Goodman diagrams. Impact loading stresses.
     
  • Tolerances and Fits

    • Definition and basic concepts of tolerances and fits. Magnitude and position of tolerance zone. Clearance fit, transition fit, and interference fit. Basic hole and basic shaft systems. ISO fitting system and selection of fits.
     
  • Design Permanent Joints

    • Design of shrink and pressed fitted joints. Design of welded joints. Welding symbols. Butt and fillet welds. Torsion and bending stresses in welded joints. Strength of welded joints. Design of riveted joints. Design considerations for brazing, bonding joints, and adhesive bonding.
     
  • Design of non-permanent Joints

    • Keyed joints. Pinned joints. Bolted joints.
     
  • Design of Shafts and Axles

    • Introduction. Geometric constraints and strength constraints. Combined variable bending and torsion. Shaft materials. Critical speeds.
     
  • Rolling Element Bearings

    • Basic principles and constructions of ball and roller bearings. Load life relationship. Combined radial and thrust loading. Variable loading and speed. Selection of rolling element bearings. Rolling element bearing lubrication, mounting, and enclosure.