Machine Elements I

Code:

EM0099

Acronym:

OMI

Keywords
Classification	Keyword
OFICIAL	Applied Mechanics

Instance: 2013/2014 - 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	179	Syllabus since 2006/2007	4	-	6	45,5	162

Teaching language

Portuguese

Objectives

As a foundation for machine design, this course on design of machine design consists of the analysis and design of some machine elements frequently used. Students are expected to know the content and apply skills from other courses, such as Solid Mechanics, Structural Mechanics, Materials, etc.,  and complement them with topics taught in this course.

Learning outcomes and competences

The learning outcomes are general, and specific.

The broad, general outcomes, consist of developing the capability for decision making concerning the design and selection of machine elements.

The specific, particular outcome, is the capability to use analytical and other frameworks for the design of common machine elements.

Working method

Presencial

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

The success in this course depends upon an adequate background in solid mechanics, structures, materials, technical drafting and technological processes.

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.


Scientific component: 60%
Technological component: 40%

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

Comments from the literature

Handouts and occasionaly copies of transparencies will be made available namely via web.

Teaching methods and learning activities

Lectures and tutorials. It is expected to include some seminars by external invited experts, as it will be the case of Eng. Juan C. A. Rodriguez (NTN-SNR Ibérica SA, Madrid) on roller bearings.

Software

Roda2007.lsp
KISSSOFT AG

keywords

Technological sciences > Engineering > Mechanical engineering

Evaluation Type

Evaluation with final exam

Assessment Components

Designation	Weight (%)
Exame	100,00
Participação presencial	0,00
Total:	100,00

Amount of time allocated to each course unit

Designation	Time (hours)
Estudo autónomo	110,00
Frequência das aulas	50,00
Total:	160,00

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.

Internship work/project

Not applicable.

Special assessment (TE, DA, ...)

According to General Evaluation Rules of FEUP.

Classification improvement

According to General Evaluation Rules of FEUP.

Observations

As usual in this course, students will be encouraged to carry out small autonomous studies and projects on relevant topics. The more interesting reports are made available to all students of this course using the dedicated FEUP websystem (the so called 'course contents')..