Machine Elements Complements

Recommended Prerequisites

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

Teaching Methods

lasses take place in theoretical and theoretical-practical regime. Theoretical classes expose the fundamental concepts in the form of conferences using transparencies and multimedia media. Theoretical-practical classes apply the concepts given in the theoretical classes through the discussion of some problems solved, previously made available to students, intending that students have an active participation.

Learning Outcomes

Provide students with a broad and integrative capacity calculation of mechanical components in projects involving springs, mounts with clamping of stationary and rotary discs, transmissions of power or energy in continuous and transitional regimes. Calculation methods are presented for gear transmission, 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 establishing 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)

Paulo Nobre Balbis dos Reis

Assessment Methods

Assessment
Exam: 100.0%

Bibliography

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

- R. C. Juvinal, K. M. Marshek, “Fundamentals of Machine Component Design”, 7th Edition, Ed. John Wiley & Sons, 2019.

- Keith Nisbett, Richard Budynas “Mechanical Engineering Design: 2024 Release Ise”, McGraw Hill, 2024.

- R. L. Norton, “Machine Design – an Integrated Approach”, 6th Edition, McGraw Hill, 2019.

- Steven Schmid, Bernard Hamrock and Bo Jacobson, “Fundamentals of machine elements” 3rd Edition – SI Version, CRC Press, 2014.

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

- International Standard 6336/2019, Calculation of Load Capacity of Spur and Helical Gears.

- BS721 – British Standard Specification for Worm Gearing, part 2, Metric Units, British Standard Institution, 1993.