Machine Elements

Code:

EM0038

Acronym:

OM

Keywords
Classification	Keyword
OFICIAL	Applied Mechanics
OFICIAL	Applied Mechanics

Instance: 2009/2010 - 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	158	Syllabus since 2006/2007	4	-	6	56	160
		Plano de estudos de transição para 2006/07	4	-	6	56	160

Teaching language

Portuguese

Objectives

1- BACKGROUND - Students are expected to know the content and apply skills from other courses

2- SPECIFIC AIMS - This course aims to give students an insight into machine design, through the analysis of dimensioning problems and through the study of some machine elements frequently used.

3- PREVIOUS KNOWLEDGE - Solid Mechanics, Structural Mechanics, Materials…and complement them with themes taught in this course.

4- PERCENTUAL DISTRIBUTION - 50% of the allocated time will be for theoretical analysis and 50% for practical analysis and calculation of mechanical components, like gears, bearings, shafts, etc

5- LEARNING OUTCOMES - In the end of the course, they should be able to design simple mechanical assemblies, like speed reducers and gearboxes. Also, they should be able to select mechanical components like rolling bearings and seals.

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 wearing;
3.2- Fundamental laws of lubrication; Reynold’s equation
3.3- Fundamental properties of lubrication
3.4- Introduction to hydrodynamic and hydrostatic lubrication

3.5 – non-lubricated bearings
3.6 – Introduction to mechanical transmission lubricant

4- Connections
4.1- Screw joints connections
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
	Exame	2,00
	Total:	-	0,00

Amount of time allocated to each course unit

Description	Type	Time (hours)	End date
	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