LV EN RU DE FR

Machine Elements I

Course developer

Prior knowledge

LauZ3126, Strength of Materials I

LauZ3162, Strength of Materials II

LauZ4190, Theoretical Mechanics II

Meha4008, Theoretical Mechanics I

Course abstract

The aim of the study course is to acquire the theory of general (typical) machine elements (part and units), engineering calculations and design, present engineering knowledge for creative machine design work, develop engineering thinking, initiative and creation, to apply the existing ideas and to search for new ones, to modulate using analogues.

Learning outcomes and their assessment

Knowledge - know the criteria for workability of machines, machines and parts, selection of materials and design methods, knowledge of the design-related standards (ISO, LVS, DIN) - 2 quizs.
Skills - how to choose a technical method to address tasks, use manuals and standards for practical tasks - 8 laboratory work tasks.

Competence - capable of modulating tasks in machine science, addressing technical tasks and conducting independent studies, is a knowledgeable, informed and capable professional – 2 homework tasks.

Course Content(Calendar)

1. Introduction. Mechanical Drives. (Lecture – 1h)
2. Determination of torque, power and speed ratio. (Lecture – 1h). Home work
3. Calculation of friction drive (Lecture – 1h)
4. Flat belt drives (Lecture – 2h, Lab work – 1h)
5. V-belt drives (Lecture – 1h, Lab work – 1h)
6. Timing belt drives (Lecture – 1h) Quiz
7. Chain drives (Lecture – 2h, Lab work– 1h)
8. Rolling bearing types (Lecture – 2h, Lab work– 1h)
9. Selection and calculation of rolling bearings (Lecture – 2h, Lab work– 1h)
10. Calculation of bearing size (Lecture – 1h)
11. Axles and shafts (Lecture – 2h)
12. Shaft load calculation (Lecture – 2h, Lab work – 1h)
13. Shaft design and sizing (Lecture – 2h) Homework
14. Cylindrical gears (Lecture – 2h, Lab work – 1h)
15. Bevel gears (Lecture – 1h)

16. Worm drives (Lecture – 1h) Quiz

Requirements for awarding credit points

Course assessment is formed follows:
• all homework tasks must be submitted and graded (20%);
• all lab tasks must be submitted and graded (50%);
• classroom quiz must be written and graded (30%).

Credit points are assigned if the rate weighted average score is at least grade 4.

Description of the organization and tasks of students’ independent work

Students must independently solve two homework tasks, as well as perform calculations for the successful execution of laboratory works. Students prepare themselves for a quiz on the subject of lectures.

Criteria for Evaluating Learning Outcomes

The grade is formed as the weighted mean of the results of homework tasks, lab tasks and the quiz.

Compulsory reading

Budynas R., Nisbett K. Shigley's Mechanical Engineering Design, 10th edition. Singapore etc.: McGraw-Hill, 2014. 1104 p.

Further reading

1. Uzkliņģis G. Mašīnu elementi. 1.daļa: Savienojumi. Jelgava: LLU, 2008. 468 lpp.

2. Fischer U., Gomeringer R., Heinzler M., Kilgus R. Mechanical and Metal Trades Handbook, 3rd edition. Europa-Lehrmittel, 2012. 444 p.

Notes

Compulsory course for students of the professional higher education study program "Machine Design and Manufacturing" and academical higher education study program "Agricultural Engineering". 3rd study year 5th semester.