Course detail

Elastohydrodynamics

FSI-9EHDAcad. year: 2021/2022

The overall aim of this course is to provide students with a general and useful introduction to the main concepts and principles of elastohydrodynamic (EHD) lubrication. It is the mechanism of lubrication that describes the separation by a lubricant film between two elastic non conforming machine elements loaded against each other, and in relative motion. The course covers introduction to EHD lubrication, the fundamentals required in understanding EHD lubrication and in-depth study of selected topics related to EHD lubrication.

Language of instruction

Czech

Mode of study

Not applicable.

Guarantor

prof. Ing. Martin Hartl, Ph.D.

Department

Institute of Machine and Industrial Design (ÚK)

Learning outcomes of the course unit

- Ability to solve problems of contacts and lubrication.
- Ability to design experiment and parameters of lubricated contacts.
- Ability to select and conduct appropriate tribological test.
- Ability to apply fundamental possibilities of theoretical calculations.

Prerequisites

General courses on mechanics, machine design, material sciences and hydromechanics.

Co-requisites

Not applicable.

Planned learning activities and teaching methods

Lectures, seminars, self-study.

Assesment methods and criteria linked to learning outcomes

The evaluation of students is based on individual work of selected theme related to the field of contact problems, elastohydrodynamic lubrication, fluid film friction or wear. The work includes theoretical description, calculations and may include own experimental results.

Course curriculum

Not applicable.

Work placements

Not applicable.

Aims

Students will be able to use theoretical fundamentals of elastohydrodynamic lubrication regime for independent research and development work. Gained knowledge will enable to understand, describe and interpret own observations of lubrication problems.

Specification of controlled education, way of implementation and compensation for absences

Teaching has a form of consultation and discussion on a given theme at arranged times.

Recommended optional programme components

Not applicable.

Prerequisites and corequisites

Not applicable.

Basic literature

Bhushan, B. Principles and Applications of Tribology. New York: John Wiley, 1999. ISBN 04-715-9407-5. (EN)
Gohar, R. Elastohydrodynamics. 2nd edition. London: Imperial College Press, 2001. ISBN 1-86094-170-2.
Gohar, R., H. Rahnejat. Fundamentals of Tribology. 1st edition. London: Imperial College Press, 2008. ISBN: 1-84816-184-0.
Stachowiak, G. W., A. W. Batchelor. Engineering Tribology. 4th edition. Boston: Butterworth-Heinemann, 2014. [cit. 2019-08-30] ISBN 0123970474. [Online] Dostupná z: https://app.knovel.com/hotlink/toc/id:kpETE00005/engineering-tribology/engineering-tribology

Recommended reading

Dowson, D. History of Tribology. 1st edition. London: Professional Engineering Publishing, 1998. ISBN 1-86058-070-X.
Hamrock, B. J. Fundamentals of Fluid Film Lubrication. 1st edition. New York: McGraw-Hill Inc., 1994. ISBN 0-07-025956-9.

Classification of course in study plans

  • Programme D-KPI-P Doctoral 1 year of study, winter semester, recommended course
  • Programme D-KPI-K Doctoral 1 year of study, winter semester, recommended course

Type of course unit

 

Lecture

20 hod., compulsory

Teacher / Lecturer

Ing. Petr Šperka, Ph.D.
prof. Ing. Martin Hartl, Ph.D.

Syllabus

1. Material Properties. Lubricant Rheology.
2. Elastostatic Contacts.
3. Governing Equations of EHD Lubrication.
4. Simple Concepts of Non-conforming Contact Lubrication.
5. Numerical Methods for EHD Lubrication Problem Solution.
6. Friction and Non-linear Lubricant Behavior in EHD Contacts.
7. Stress and Fatigue in EHD Contacts.
8. Micro-EHD lubrication and mixed EHD lubrication.
9. Transient EHD lubrication.
10. Temperature and Abnormal Phenomena.