Machine Elements

Code:

EIG0054

Acronym:

OM

Keywords
Classification	Keyword
OFICIAL	Applied Mechanics

Instance: 2013/2014 - 2S

Active?	Yes
Responsible unit:	Applied Mechanics Section
Course/CS Responsible:	Master in Engineering and Industrial Management

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
MIEIG	137	Syllabus since 2006/2007	3	-	6	52	162

Teaching language

Portuguese

Objectives

This course is a foundation for machine design, through the analysis and design of some machine elements frequently used. Students are expected to use knowledge already obtained in other courses, such as solid mechanics, materials and technological processes, and to complement that knowledge through applications to design of machine elements.

Learning outcomes and competences

Development of an understanding of machine elements, namely their analysis, performance and selection.

Working method

Presencial

Pre-requirements (prior knowledge) and co-requirements (common knowledge)

An adequate background on solid mechanics, fabrication processes and technical drafting.

Program

1 - Gears:

1.1 - Classification; criteria based upon axles and teeth; the case of parallel axes: spur and helical gears.

1.2 - The MAAG system for cutting gears; basic rack profile; involute.

1.3 - Metrology: base tangent length Wk; measurement over balls on external gears.

1.4 - Mating gears; contact ratio.

1.5 - Addendum modification; sliding; interference; imposed center distance.

2 - Fatigue design:

2.1 - Uniaxial and biaxial loading.

2.2 - Mean stress; Goodman and Soderberg.

2.3 - Stress concentration. The improvement of fatigue behaviour. The effect of residual stress fields.

3 - Tribology:

3.1 - Friction and wear.

3.2 - Lubrication laws; Reynolds equation.

3.3 - Lubricants' properties.

3.4 - Introduction to hydrodynamic and hydrostatic lubrication.

3.5 - Dry bearings.

3.6 - Introduction to the lubrication of mechanical drives: Cheng's theory

4 - Structural connections:

4.1 - Mechanical fastening.

4.2 - Welded connections.

Mandatory literature

Henriot, Georges; Traité théorique et pratique des engrenages
Ferreira, Luís António de Andrade; Tribologia. ISBN: 972-95794-5-8
C. Moura Branco, A. Augusto Fernandes, Paulo M. S. Tavares de Castro; Fadiga de estruturas soldadas

Complementary Bibliography

Hamrock, Bernard J.; Fundamentals of fluid film lubrification. ISBN: 0-8247-5371-2
Niemann, Gustav; Manuale degli organi delle macchine. ISBN: 88-481-1649-3
Branco, C. Moura 070; Projecto de órgãos de máquinas. ISBN: 978-972-31-1261-0
Shigley, Joseph Edward; Mechanical engineering design. ISBN: 0-07-100607-9

Teaching methods and learning activities

Lectures  and tutorials. It is expected to include some external lectures by external invited experts.

Software

KISSSOFT AG
Roda2007.lsp

keywords

Technological sciences > Engineering > Mechanical engineering

Evaluation Type

Evaluation with final exam

Assessment Components

Designation	Weight (%)
Exame	100,00
Total:	100,00

Amount of time allocated to each course unit

Designation	Time (hours)
Estudo autónomo	110,00
Frequência das aulas	52,00
Total:	162,00

Eligibility for exams

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Calculation formula of final grade

Final exam: 100%.

Examinations or Special Assignments

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Internship work/project

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Special assessment (TE, DA, ...)

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Classification improvement

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Observations

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