Mechanics and Design of Machines

Module summary

Module code: MECH1070
Level: 5
Credits: 15
School: Engineering and Science
Department: Engineering
Module Coordinator(s): Chi Le / Michael Okereke

Specification

Pre and co requisites

Materials and Design (Year 1)

Aims

The Module aims to cover fundamental principles of mechanics of materials, design of machine elements, and related core knowledge of engineering design and product development. These are essential skills needed by mechanical engineers to develop fundamental backgrounds as well as professional skills and practice. The Module will teach students how to undertake theoretical/analytical considerations of machine elements, including classification, working principles, selection, design and manufacturing. To help with hands on application of the principles, the students will be expected to undertake a problem-based learning project with a design and product development outcome. The students will be working either as individuals or members of a small project group.

Learning outcomes

On successful completion of this module a student will be able to:
1 Comprehend theories and fundamentals of mechanics of materials required for reliable design of machines and machine elements.
2 Demonstrate understanding of the analytical mechanics considerations needed in design of machines and machine elements.
3 Understand working principles, design, selection, and manufacturing aspects of machine elements
4 Demonstrate understanding of fundamentals of engineering design and product development in general and design of machines and machine elements in particular.

Indicative content



MECHANICS OF MACHINE ELEMENTS PART

• Introduction to stresses and Strains: The concept of internal resultant forces; normal and shear stresses; average stresses; strain; etc.
• Mechanics of pressurized vessels: Design considerations; thick and thin-walled cylindrical pressure vessels; cylindrical vessels; spherical vessels; failure modes; allowable loads, factor of safety.
• Mechanics of axially-loaded structures: Deformation, normal stresses and strains for prismatic and non-prismatic bars; stepped composite bars; statically determinate and indeterminate structures; special cases of axially loaded beams: thermal deformation and stress; stress concentrations.
• Mechanics of multiple-loaded structures: Introduction to multiple loaded analysis; plane stress; stresses on inclined planes; principal stresses; maximum shear stress; construction of Mohr`s circle for plane stresses and strains, strain rosettes.
• Mechanics of Torsionally-loaded structures: Torsional deformation of circular shafts; Torsional shear stress; Angle of twist; Torsion of non-circular sections; Gears in torsion assembly; Power transmission.



• Mechanics of structures under flexural loads:
- Shear Forces and Bending Moment Diagrams in Beams: beam reactions; shear force and bending moment expressions; load, shear and moment relationships; construction of shear forces and bending moment diagrams
- Bending Stresses and Strains in Beams: beam deformation in pure bending; normal strains in beams; normal stresses in beams; shear stresses in beams; composite beams; stress concentration in beams.

DESIGN OF MACHINE ELEMENTS PART

• Machine elements (Classification, working principles, selection, design and manufacturing):
- General introduction and scope of machine elements.
- Friction reduction – bearings.
- Energy transmission: gears, belts and chains, cams.
- Locating and energy transmission: Fastening and power screws.
- Energy Storage: Springs, flywheel.
- Shafts and shaft components.
- Sealing: Static and dynamic seals.
- Switching: Clutches, valves, Geneva Mechanism.
- Energy conversion: Turbo machinery, brakes, engines, actuators, rockets.
- Others: Housing, hinges, pivots, linkages, levers.

• Engineering design and product development: Process and methods, advanced technologies for Engineering Design and Product Development: Computer Aided Engineering (CAE), CAD/CAM/CNC, 3D visualisation and animations, Additive Manufacturing (AM) and 3D Printing (3DP), and Reverse Engineering.

• Problem-based learning case studies, tutorials and lab sections.

Teaching and learning activity

The lectures are supported with comprehensive videos, demonstrations, lecture notes and presentations. Additional guides and tutorials are available for students at the end of the main contents of a Module. State of the art industrial applications and case studies are used to support presentations, tutorials and in-class activities, with an online access to web-based materials, discussion forums, and training videos of software and tools. The problem-based learning group projects and lab sections are designed for students to apply the theories into the practice, as well as to develop both practical and transferable skills.

Assessment

Students are required to pass all components in order to pass the course.

Group Project - 30%
LO - 3-4.
Pass mark - 40%
3,000 – 4,000s words.
This is a problem-based learning group project, aimed to meet the core expected design-based learning outcomes of a Module. Each student must keep an individual logbook in which their own contribution to the group project is highlighted. The individual logbook and peer group assessment forms are used to assess individual contributions to the project.

Exam - 70%
LO - 1-3.
Pass mark - 40%
2 hours.
This is a closed book exam, aimed to meet the core expected learning outcomes of a Module, covering the fundamental backgrounds and theories of mechanics and design of machines.

Nature of FORMATIVE assessment supporting student learning:
Tutorials, Mock Exam, Observations, Questioning, Discussion, Constructive Quizzes, Practice Lab Report, Practice Exam Paper.