Machine Elements Complements

Recommended Prerequisites

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

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 equipment of a vast majority of machine elements analyzed in the curriculum.

Learning Outcomes

Provide students with a broad and integrative capacity calculation of mechanical components in projects involving, springs. mounts with clamping of stacionary and rotary discs,  transmissions of power or energy in continuous and transitional regimes. Calculation methods are presented for gear tranmissions, brakes and clutches. At the end of the course, students will be able to: make the design of these machine elements, based on analytical methods and dedicated software, developing a critical sense and establish strategies to optimize design.

Work Placement(s)

No

Syllabus

- Springs. Types of springs. Stresses and deflections. Materials. Stability. Fatigue evaluation. Critical Frequency

- Mounts with clamping. Clamping mounted rotary discs. Flywheels: Lamé equations and their applications.

- Gear transmissions. Cylindrical Gears: In-depth study of toothed correction to eliminate interference and to balance specific slips. Bevel Gears: Dynamic Analysis. Epicycloidal trains. Differential and car gearboxes. Calculation of gear load capacity; ISO 6336. Demonstration and use of KISSsoft software

- Worm gear. Efficiency. Practical method of design according to BS721.

- Brakes and clutches: Performance parameters, Dynamic analysis, Classification. Load capacity calculation. Friction materials.

Head Lecturer(s)

Amílcar Lopes Ramalho

Assessment Methods

Assessment
Exam: 100.0%

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

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

- International Standard 6336/2006, Calculation of Load Capacity of Spur and Helical Gears.

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

- Software Autodesk Inventor, KISSoft, 1993