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Dades generals

Curs acadèmic:
2022
Descripció:
Disseny de màquines.
Crèdits ECTS:
5

Grups

Grup A

Durada:
Semestral, 1r semestre
Professorat:
Alex Fernandez Chamorro  / Narcís Gascons Clarió  / Pablo Martin Villarroel Marquina
Idioma de les classes:
Català (50%), Anglès (50%)

Grup DT

Durada:
Semestral, 1r semestre
Professorat:
Alex Fernandez Chamorro  / Narcís Gascons Clarió  / Pablo Martin Villarroel Marquina
Idioma de les classes:
Català (50%), Anglès (50%)

Competències

  • CT13 Analitzar les implicacions ètiques de les actuacions professionals
  • CT15 Utilitzar la llengua anglesa
  • CE21 Coneixements i capacitats per al càlcul, disseny i assaig de màquines.

Continguts

1. Introduction to mechanical design.

          1.1. Mechanical elements description.

          1.2. The design process.

2. Component loading.

          2.1. Free Body Diagrams.

          2.2. Loading on a section.

          2.3. Stress distribution.

          2.4. Critical points in a section.

          2.5. Stress concentration.

          2.6. Bending of curved beams.

          2.7. Contact stresses.

          2.8. Multiaxial states of stress and strain.

          2.9. Stiffness and buckling.

3. Theories of failure (Statics).

          3.1. Materials strength.

          3.2. Failure of brittle materials: Modified Coulomb-Mohr theory.

          3.3. Failure of ductile materials: Von Mises theory.

          3.4. Safety factor.

4. Cyclic stress and fatigue.

          4.1. Uniaxial fatigue (Stress-Life theory).

          4.2. Multiaxial fatigue.

5. Element selection.

          5.1. Selection of standard elements.

          5.2. Transmission design.

                    5.2.1. Shaft design.

                    5.2.2. Bearing selection.

                    5.2.3. Gear design.

Activitats

Tipus d’activitat Hores amb professor Hores sense professor Hores virtuals amb professor Total
Prova d'avaluació 5,00 8,00 0 13,00
Resolució d'exercicis 0 22,00 0 22,00
Sessió expositiva 23,00 21,00 0 44,00
Sessió participativa 12,00 12,00 0 24,00
Sessió pràctica 10,00 12,00 0 22,00
Total 50,00 75,00 0 125

Bibliografia

  • Budynas, Richard G (cop. 2011 ). Shigleys's mechanical engineering design (9th ed.). New York: McGraw Hill. Catàleg
  • Childs, Peter R. N (cop. 2004 ). Mechanical design (2nd ed.). Amsterdam [etc.]: Elsevier. Catàleg
  • Collins, Jack A (cop. 2003 ). Mechanical design of machine elements and machines : a failure prevention perspective . New York [etc.]: John Wiley & Sons. Catàleg
  • Dimarogonas, Andrew D (cop. 2001 ). Machine design : a CAD Approach . New York [etc.]: John Wiley & sons. Catàleg
  • Fogiel, M. (cop. 1988 ). The Machine design problem solver . Piscataway, New Jersey: Research and Education Association. Catàleg
  • Ibbotson, Mark (2009). Professional English in Use. Cambridge University Press.
  • Norton, Robert L (cop. 2011 ). Machine design : an integrated approach (4th ed.). Boston: Pearson. Catàleg

Avaluació i qualificació

Activitats d'avaluació:

Descripció de l'activitat Avaluació de l'activitat % Recuperable
Laboratory and computer room sessions (LAB). See "Criteris de qualificació". 10 No
Interactive solving of exercices and vocabulary tests (CAE). See "Criteris de qualificació". 15 No
Continuous assessment proof (PAC). See "Criteris de qualificació". 15 No
Final exam (FE). See "Criteris de qualificació". 60

Qualificació

The evaluation involves several activities:

1) Lab/computer sessions (LAB): The students will work in teams inside the lab groups. The teams will be formed in the first week of the course.In some sessions, the students will be asked to submit reports while, in other ones, the assessment will be done using quizes or other activities in Moodle. The grade is individual, each student must complete the activity.

2) Continuous Assessment Exercises (CAE): The students will work individually. Reports and exercices must be submitted by the student using Moodle tasks (reports must be submitted in pdf format) before a specific deadline. Self or peer assessment will be mainly used, although the professor can assume grading of any task ig he decides so.

3) Approximately at midterm there will be a written proof (PAC) consisting of an exercise of an element similar to the ones that can appear in the final exam. The exercise will ask the student to do an analysis with the knowledge acquired up to date. This activity is individual.

4) In order to keep pace with the course, the student is expected to attend all lectures and exercise sessions in the weekly schedule, both on-site and virtual. Daily (or sampling) attendance controls will be done.

5) There will be one final exam (FE).

The final grade (FG) consists of the maximum of the following:

If FE >= 4.0, then FG = MAX(FG1,FG2,FG3,FG4)

If FE < 4.0, then FG = MIN(MAX(FG1,FG2,FG3,FG4), 4.0)

where

FG1 = 0.6 * FE + 0.15 * PAC + 0.1 * LAB + 0.15 * CAE
FG2 = 0.75 * FE + 0.1 * LAB + 0.15 * CAE
FG3 = 0.70 * FE + 0.15 * PAC + 0.15 * CAE
FG4 = FE

Only the final exam (FE) has a resit. Only students who have failed the final exam will be allowed to resit the exam and get a new FE grade.

If a student has an attendance below 60 % of the classroom sessions (including lab sessions), does not attend the PAC, does not attend any of the lab sessions or does not deliver any of the corresponding reports or at least 80 % of the CAE activities, he/she will get a grade FG = FE.

Cheating in any of the evaluation activities is strongly advised against. If detected, it will imply a fail grade plus the corresponding academic penalties.

Criteris específics de la nota «No Presentat»:
The student will get a "No Presentat (NP)" grade if he/she doesn't sit at the final exam and does not participate in any of the continuous assessment activities (LAB and/or CAE) or explicitly communicates to the course responsible that he/she is not continuing with the course.

Avaluació única:
If the student applies to be graded in a single activity, he/she will have to come in the date scheduled for the final exam and take an exam that will basicaly be the same of the other students, although it can also include some questions covering the contents of the LAB and CAE activities.

Requisits mínims per aprovar:
To pass the course you need a minimum grade of FG = 5.0.

Tutoria

There will be specified weekly time frames for on-line tutorships on-demand (via GoogleMeet or any other platform approved by UdG). Electronic mail can be also used to solve questions or doubts and set tutorship appointments out of the specified time frames.

Comunicacio i interacció amb l'estudiantat

Communication with students will be via e-mail and the News forum of the course’s Moodle. Individual on-line meetings will be possible for a personalised monitoring.

Observacions

Lab/Computer room sessions:
Some of the sessions will be done with the ANSYS software in a computer room of the School, while the others will take place in the Lab of Machine Design. The contents of the sessions will be announced at the beginning of the course.

All deliverables worked out by the sutdents individually or in teams must be correctly written and drawn.

All the deliverables will have a deadline after which they will not be accepted. Report submissions must be done using Moodle and strictly in a single document in pdf format each.

Assignatures recomanades

  • Elasticitat i resistència de materials
  • Expressió gràfica
  • Fonaments de ciència de materials
  • Fonaments de mecànica
  • Teoria de màquines

Modificació del disseny

Modificació de les activitats:
In case of exceptional circumstances (as in preceding years, affected by the pandemic) the indications of the Rector of the UdG will be applied. All activities can be adapted to the on-line format.

Modificació de l'avaluació:
In case of exceptional circumstances (as in the preceding years, affected by the pandemic) the indications of the Rector of the UdG will be applied.
Specifically, in case the activities needed to be on-line, the grading of the course won't be modified.

Tutoria i comunicació:
In case of exceptional circumstances (as in preceding years, affected by the pandemic) the indications of the Rector of the UdG will be applied.

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