Machine Elements

Code:

EM0038

Acronym:

OM

Keywords
Classification	Keyword
OFICIAL	Applied Mechanics
OFICIAL	Applied Mechanics

Instance: 2010/2011 - 1S

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
MIEM	185	Syllabus since 2006/2007	4	-	6	56	160

Teaching language

Portuguese

Objectives

This course aims to give students an insight into machine design, through the analysis of dimensioning problems and through some machine elements frequently used. Students are expected to know the content and apply skills from other courses (Solid Mechanics, Structural Mechanics, Materials…) and complement them with themes taught in this course.

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.
3.6 - Dry bearings.
3.7 - 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; Engrenages. ISBN: 2-10-003903-2
MAAG Gear Company, Ltd.; MAAG gear book
Ferreira, Luís Andrade; Tribologia. ISBN: 972-95794-5-8
Bernard J. Hamrock; Fundamentals of Fluid Film Lubrication, McGraw-Hill, 1994. ISBN: 0 07 025956 9
Branco, Carlos Augusto Gomes de Moura; Fadiga de estruturas soldadas. ISBN: 972-31-0139-4

Complementary Bibliography

Branco, C. M., Ferreira, J. M., Costa, J. D., Ribeiro, A. S.; Projecto de Órgãos de Máquinas, Fundação Calouste Gulbenkian

Teaching methods and learning activities

Theoretical classes (2 hours per week)
Theoretical-practical classes (2 hours per week)
Invited experts will be giving presentations

keywords

Technological sciences > Engineering > Mechanical engineering

Evaluation Type

Evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Attendance (estimated)	Participação presencial	56,00
Examination	Exame	2,00
	Total:	-	0,00

Amount of time allocated to each course unit

Description	Type	Time (hours)	End date
Study	Estudo autónomo	104
	Total:	104,00

Eligibility for exams

According to General Evaluation Rules of FEUP

Calculation formula of final grade

According to General Evaluation Rules of FEUP

Examinations or Special Assignments

Not applicable

Special assessment (TE, DA, ...)

According to General Evaluation Rules of FEUP

Classification improvement

According to General Evaluation Rules of FEUP