Machine Elements

Code:

EM0038

Acronym:

OM

Keywords
Classification	Keyword
OFICIAL	Applied Mechanics
OFICIAL	Applied Mechanics

Instance: 2009/2010 - 2S

Active?	Yes
Responsible unit:	Applied Mechanics Section
Course/CS Responsible:	Master in Mechanical Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
MIEIG	130	Syllabus since 2006/2007	3	-	6	56	160

Teaching language

Portuguese

Objectives

1- BACKGROUND - Students are expected to use knowledge already obtained in other courses

2- SPECIFIC AIMS - The objective of this course is to give knowledge relevant for machine design, through the analysis of design problems and of some machine elements frequently used.

3- PREVIOUS KNOWLEDGE - Mechanics, Fluid Mechanics, Solid Mechanics, Structures and Materials

4- PERCENTUAL DISTRIBUTION - 50% theoretical lectures, 50% practical exercises by the students

5- LEARNING OUTCOMES - to design machine elements

Program

1. Gears
1.1- Classification; Parallel axis gear, straight tooth gear and helical gears;
1.2- MAAG systems (generating rack). Circular involute
1.3- Metrology (tangential in k tooth cut and cylindrical gauge use)
1.4- Engagement; contact ratio; active radius
1.5- Gear teeth correction concerning equilibrium and specific slipping, interference and functioning with gear pair

2. Dimensioning – fatigue design
2.1 – Uniaxial and biaxial stress
2.2- Average voltage; Soderberg
2.3- Stress concentration; fatigue evaluation procedures; effects of residual tension

3. Tribology
3.1- Friction and surface wear;
3.2- Lubrication fundamental law’s; the Reynold’s equation
3.3- Fundamental properties of lubricants;
3.4- Introduction to hydrodynamic and hydrostatic lubrication

3.5 – Non-lubricated bearings
3.6 – Introduction to the lubrication of mechanical gear transmissions: Chang theory

4- Connections
4.1- Screw connections
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
Castro, Paulo Manuel Salgado Tavares de 340; Ciência e tecnologia dos materiais. ISBN: 0870-8312
Shigley, Joseph Edward; Mechanical engineering design. ISBN: 0-07-100607-9

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

Teaching methods and learning activities

Lectures (2h/week) and tutorials (2h/week). It is expected to include some external lectures by external invited experts.

Software

Roda.lsp
Roda.lsp

Evaluation Type

Evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Attendance (estimated)	Participação presencial	0,00
	Total:	-	0,00