Design of machine elements

Year
4
Academic year
2020-2021
Code
02007251
Subject Area
Mechanical Engineering Sciences
Language of Instruction
Portuguese
Mode of Delivery
Face-to-face
Duration
SEMESTRIAL
ECTS Credits
6.0
Type
Compulsory
Level
2nd Cycle Studies - Mestrado

Recommended Prerequisites

Strength of Materials I e II, Applied Mechanics, Science and Engineering of Materials, Mechanical Behaviour of Materials, Introduction to Mechanical Design.

Teaching Methods

Classes take place in theoretical and theoretical-practical scheme. In the lectures sets out the fundamental concepts in the form of lectures using transparencies and multimedia In the theoretical-practical apply the concepts taught in lectures to solve practical problems and demand that the student has an active participation suggesting strategies for solving the problems posed. Students should also do a small project that includes the sizing and selection of machine elements and will be conducted mostly in non-school hours.

Learning Outcomes

Provide students with a broad and integrative capacity calculation of mechanical components in projects involving transmission of power or energy in continuous and transitional regimes. Calculation methods are presented for mechanical transmission elements. At the end of the course, students will be able to: select the most suitable type of transmission to the particular conditions of service of a particular case, to make the design of mechanical transmission elements, based on analytical methods, to make the selection from a catalog of elements of mechanical transmissions, developing a critical sense and establish strategies to optimize design.

Work Placement(s)

No

Syllabus

Mechanical transmissions: General characteristics and selection of mechanical transmissions.

Design of belt transmissions. Geometry. Construction details and assembly. Types of failure. Dynamic study.

Design of roller chain transmissions. Nomenclature and geometric relationships. Kinematic analysis. Selection of the transmission. Assembly and maintenance. Forces. Dynamic study of the influence of linear velocity of the chain.

Transmissions by gears. Cylindrical gears: primitive surfaces and surfaces of teeth, geometrical relationships, the study of gear, slip, interference, correction of teeth. Worm/wheel gear: primitive surfaces, symbols and geometric relationships, technological study. Dynamic analysis. Mechanical efficiency. Bevel gears: dynamic analysis. Epicyclic trains. Differential and gearbox.

Brakes and clutches: performance parameters of the brakes when slowing down the system, dynamic analysis, sizing and materials used as friction elements.

Realization of a project.

Head Lecturer(s)

José Domingos Moreira da Costa

Assessment Methods

Assessment
Project: 25.0%
Prove: 75.0%

Bibliography

C.M. Branco, J.A.M.Ferreira, J.D.M. Costa e A.Ribeiro“Projecto de Orgãos de Máquinas”, Ed. Fundação C. Gulbenkian,2008

R. C.Juvinal, K. M. Marshek,“Fundamentals of Machine Component Design”, Ed. John Wiley & Sons,1991

J. R.Shigley, C. R.Mischke,“Mechanical Engineering Design”, McGraw-Hill International Edition,1989

R. L.Norton,“Machine Design – an Integrated Approach”, Ed. Prentice Hall Inc.1996

G. Henriot,Traité Théorique et Pratique des Engrenages, Vol. 1“Théorie et Technologie”,6ª ed,1979

G. Niemann, Elementos de Máquinas, Editora Edgard Blucher Ltda, São Paulo, Brazil

Manual de Projecto de Correias Trapezoidais nº E2/20070, Gates,1999

Manual de Projecto de Correias Dentadas nº E2/20099, Gates,1999

Catálogo de Correntes Refª REN8/ENG/17/98/5K/2,1998, Renold Power Transmission Limited,1998

International Standard 6336/1996, Calculation of Load Capacity of Spur and Helical Gears

BS721-British Standard Specification for Worm Gearing, part 2, Metric Units, Britich Standard Institution