Machine Elements
Keywords |
Classification |
Keyword |
OFICIAL |
Applied Mechanics |
OFICIAL |
Applied Mechanics |
Instance: 2009/2010 - 1S
Cycles of Study/Courses
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