102322 - MACHINES AND MECHANISMS II

Subject type: Mandatory

Coordinator: Julián Horrillo Tello

Trimester: Second term

Credits: 4

The subject Mechanisms and Machines II, centered in the description, interpretation and calculation of accionamientos and his auxiliary elements, completes the integral training in the field of the mechanisms and the machines. It is a key element for the consolidation of learning, as it allows students to apply in the design of machine elements that has been worked on in other subjects. On the other hand, it is a key source of theoretical and applied knowledge for the professional practice of the mechanical engineer with regard to Machine Design.

As a result of the learning activity the student will be able to achieve the following learning outcomes:

• LO3: Model and solve the mechanisms for driving machines.
• LO7: Use technical-scientific terminology related to mechanical systems, machines or mechanisms in different languages, especially English.

The development of the contents of the subject is based on the use of a methodology that integrates tools and methods used in professional practice. It is important to know, understand and apply the analysis and synthesis of mechanisms. The structure used for the study of the different mechanisms is based on the knowledge of the same through their identification and description, the deduction their operation, the understanding of the theoretical development of the bases for the calculation and the calculation in function of its specifications.
The face-to-face part of the course consists of 4 and 2 hours, alternating weekly, of theoretical classes in the classroom (large group) and two hours, fortnightly, of practical classes in laboratories (small group). In the theoretical classes, of expository and participatory character, concepts will be developed on drives and their auxiliary elements. In order to consolidate these concepts, exercises are carried out. In the laboratory practices students will work in groups of two or three people. In order to consolidate the topics worked on in the theoretical classes, in the practices works applied to elements of real machines are carried out.
During the course, students will have documentation of the topics developed in the theoretical and laboratory classes, and examples of solved exercises.
Students will have to devote additional time, non-contact, in the study, resolution of exercises, previous works and reports of the practices, as well as the preparation of the written tests.

1. DRIVES

• Equation of the dynamics of a transmission system
• equivalent inertia
• Power drives Starting torque
• quick drives

2. STEERING WHEELS

• Degree of irregularity of the machines
• Calculation of the flywheel

3. RUBBING IN MACHINES

• Effects of friction on machines
• Friction in the links
• Friction between rigid limbs
• Rubbing on a flexible limb
• Description, analysis and calculation of clutches and brakes
• Description, analysis and calculation of belts

4. FLEXIBLE TRANSMISSION ELEMENTS

• Description, analysis and calculation of toothed belts and chains
• Selection of market components

5. GEAR TRANSMISSIONS

• Gears and gear trains
• Gear theory
• Geometry of gears
• Straight and helical cylindrical wheels
• Conical and hyperbolic gears

The following describes the evaluative learning activities that seek to help students acquire the Learning Outcomes of the subject and the teacher to obtain evidence that students achieved in them.
Evaluation activity 1: Written partial test 1 (Ex1).

1. Description:
   • Written test (exam) of evaluation of the theoretical contents and the resolution of problems developed in the subjects from 1 to 7.
2. Support Material:
   • Notes and bibliography of the subject
3. Deliverables and links to the evaluation:
   • Test resolution.
   • Represents 35% of the total grade of the subject.
4. Links to Learning Outcomes:
   • In the activity the evidence of having achieved the Learning results is obtained: LO3.

Evaluation activity 2: Written partial test 2 (Ex2).

1. Description:
   • Written test (exam) of evaluation of the theoretical contents and the resolution of problems developed in the subjects from 8 to 10.
2. Support Material:
   • Notes and bibliography of the subject
3. Deliverables and links to the evaluation:
   • Test resolution.
   • Represents 35% of the total grade of the subject.
4. Links to Learning Outcomes:
   • In the activity the evidence of having achieved the Learning results is obtained: LO3.

Evaluation activity 3: Laboratory Practices (Pr).

1. Description:
   • Recognize, interpret, synthesize, simulate and calculate different mechanisms.
   • The activity is carried out in groups of 2-3 students in the laboratory.
2. Support Material:
   • Notes and bibliography of the subject.
   • Internship script.
   • Teaching equipment, machine tools, measuring elements, tools and laboratory and workshop consumables.
3. Deliverables and links to the evaluation:
   • Practice Experiment Report as indicated in the script.
   • This activity represents 20% of the final grade of the subject.
4. Links to Learning Outcomes:
   • In the activity the evidence of having achieved the Learning results is obtained: RA3 and RA7.
5. Laboratory sessions:
   • 5 laboratory sessions.

Evaluation activity 4: Work Report (Inf).

1. Description:
   • Recognize, interpret and calculate mechanisms.
   • The activity is done in groups of 2-3 students.
   • The deliverable material of the activity is a report.
2. Support Material:
   • Notes and bibliography of the subject.
   • Report script.
   • Teaching equipment, machine tools, measuring elements, tools and laboratory and workshop consumables.
3. Deliverables and links to the evaluation:
   • Report according to the script.
   • This activity represents 10% of the final grade of the subject.
4. Links to Learning Outcomes:
   • In the activity the evidence of having achieved the Learning results is obtained: RA3 and RA7.

The calculation for the Final Grade (NF) of the subject is:

NF = 0,35 Ex1 + 0,35 Ex2 + 0,1 Inf + 0,2 Pr

• NF: Final Note
• Ex1: 1st Partial Examination (35%).
• Ex1: 2nd Partial Examination (35%).
• Inf: Work Report Note (10%) = (INF1 + INF2 + INF3) / 3
• Pr: Practice Note (20%) = (P1 + P2 + P3 + P4 + P5) / 5

Clarifications:

• The minimum grade for each of the exams is 3,5. In the event that any of the grades for the Ex1 and Ex2 activities is below the minimum grade, the final grade for the subject will be limited to 4.
• Minimum mark of Practices (Pr) is 4. In case the mark of Practices is below the minimum mark, the final qualification of the asignatura will remain limited to 4.
• Minimum grade of Work Report (Inf) is 4. In case the grade of Work Report is below the minimum grade, the final grade of the subject will be limited to 4.

Recovery:

• It will be possible to recover all the evaluation acts separately (1st Partial Examination, 2nd Partial Examination and Practices).

Genovese, PA (2020). Notes on Mechanisms and Machines II. Mataró: ESUPT Tecnocampus.

Uicker, Jr., JJ, Pennock, GR, & Shigley, JE (2017). Theory of Machines and Mechanisms. New York: Oxford University Press.

Cardona Foix, S., & Clos Costa, D. (2008). Machine theory. Barcelona: Edicions UPC.

Norton, RL (2013). Machinery Design. Mexico City: McGraw-Hill - Interamericana de Editores SA de CV

Riba Romeva, C. (1999). Selection of engines and transmissions in the mechanical project. Barcelona: CPDA-UPC.