Course detail
Machine Design - Machine Elements
FSI-5KS-A Acad. year: 2022/2023 Winter semester
The aim of the course is to provide an overview of machine parts and joints like mechanical springs, bearings, axles and shafts and bolted, riveted, welded and bonded joints. Attention is paid especially to get understanding of their function and learn the methods used in their design process. The course integrates the knowledge acquired in theoretical courses of Mechanical Engineering Bachelor's degree programme, particularly in branches of materials science and mechanics.
Language of instruction
English
Number of ECTS credits
6
Supervisor
Department
Learning outcomes of the course unit
– Understanding the mechanisms and causes of failure of machine parts.
- Knowledge of the principle, calculation and use of basic machine parts.
- Ability to apply the acquired knowledge in the design of new machines and equipment.
Prerequisites
Knowledge:
- materials science (choice of materials),
- statics (load analysis),
- elasticity and strength (stress and strain analysis).
Passing the course: 4PP Strength of Materials I.
Planned learning activities and teaching methods
Lectures, exercises, self-study.
Assesment methods and criteria linked to learning outcomes
The course is completed by taking an exam after the previous awarding of the credit.
The credit confirms that the student actively participated in the work during the semester and received at least 15 points out of a maximum of 30 points. The criterion of point evaluation is the degree of ability to solve assigned tasks correctly and independently.
The exam investigates the complex mastery of the subject matter defined in the course card and especially the ability to apply the acquired knowledge independently and creatively. The level of mastery of the issue is evaluated in the range of 0 to 70 points. The student must obtain at least 35 points out of maximum of 70 points.
The exam has a written and an oral part. The written part of the exam is mandatory for all students. It consists of three calculation tasks and one question. The oral part of the exam is voluntary.
Aims
Students will be able to analyse and design basic machine components such as mechanical joints, energy accumulators, bearings and seals.
Specification of controlled education, way of implementation and compensation for absences
Lectures: attendance is voluntary.
Exercises: attendance is mandatory and controlled by the teacher. Maximum of two absences are allowed in total. In case of long-term absence, compensation for missed classes is in the competence of the course guarantor.
The study programmes with the given course
Programme B-STI-Z: Fundamentals of Mechanical Engineering, Bachelor's, elective
Programme B-MET-P: Mechatronics, Bachelor's, compulsory-optional
Programme B-STI-A: Fundamentals of Mechanical Engineering, Bachelor's, compulsory
Type of course unit
Lecture
39 hours, optionally
Teacher / Lecturer
Syllabus
1. Introduction to the mechanical engineering design. Limit states, design factor, factor of safety.
2. Failures resulting from static loading. Fatigue failures resulting from variable loading.
3. Shafts and axles. Connections of the shaft and the hub.
4. Surfaces of machine elements. Contact of solids. Friction, lubrication and wear.
5. Classification of the mechanical connections. Power screws. Threaded fasteners.
6. Preloaded bolt connections. Riveted joints.
7. Welded, soldered, and bonded joints.
8. Helical compression, extension and shear springs. Disc and leaf springs.
9. Rolling bearings. The dependence between load, durability and reliability. Combined and variable loading.
10. Modified bearing life equation. Tapered bearings. Lubrication of bearings and bearing design.
11. Theory of hydrodynamic lubrication. Radial journal bearings with hydrodynamic lubrication.
12. Pressure-fed radial journal bearings. Radial journal bearings with boundary lubrication.
13. Pipes and fittings.
Computer-assisted exercise
26 hours, compulsory
Teacher / Lecturer
Syllabus
1. Load analysis, stress and strain analysis.
2. Failures resulting from static loading.
3. Fatigue failure resulting from variable loading.
4. Stress analysis of shafts.
5. Deformation and vibration analysis of the shafts. Connections of the shaft and the hub.
6. Contact stresses and fatigue contact strength.
7. Analysis of preloaded bolt connections under static and fatigue tensile load.
8. Bolted and riveted joints loaded perpendicularly to the axis.
9. Welded joints.
10. Helical compression and extension springs.
11. Rolling bearings.
12. Radial journal bearings under hydrodynamic and boundary lubrication.
13. Summary of the subject matter.