Spring Course: Practical Rotordynamics for Real Machinery, April 24-27, 2023

Practical Rotordynamics for Real Machinery, April 24-27, 2023

From Mark A. Corbo, P.E.: As a result of the highly favorable reviews we received for its first dozen-plus offerings in 2012 through 2022, I am pleased to announce that we will be repeating our week-long rotordynamics training course this coming April. The course, entitled “Practical Rotordynamics for Real Machinery” will be presented the week of 24 April, 2023.

Because of the recent resurgence in COVID and the recent problems associated with flying, we have decided to again present this course virtually, via Zoom. We have done this course virtually several times, and we have received the same rave reviews that we are accustomed to getting for the in-person version of this course. Thus, we have no qualms about taking the virtual route again.

Since the course focuses on three major topics, we have three expert instructors participating, as follows:

1. Lateral Rotordynamics – Malcolm Leader, P.E. (President – Applied Machinery Dynamics) –
Malcolm has long been known as one of the best rotordynamicists in the world and is also well known for his keen troubleshooting abilities. He has written several dozen papers on these topics.

2. Bearings – Dr. Erik Swanson, P.E. (President – Xdot Engineering and Analysis) – In addition to traditional fluid-film bearings, Erik is well-known for his expertise in foil and magnetic bearings. Additionally, Erik is a wizard at using the DYROBES rotor/bearing computer code, which all of the presented case studies have been done in.

3. Torsional Vibration – Mark A. Corbo, P.E. (President – No Bull Engineering) – In addition to having authored some of the most well-known and best-received papers on the subject, I am currently serving as the Chair for the Torsional section of the API 684 rotordynamics tutorial.

Although the syllabus from last fall’s course is probably going to be “tweaked” a bit, some of the topics that will be addressed in depth include the following:

1. Fundamentals/Basics
2. Relevance of the various topics (i.e., why do we even care about this?)
3. Modeling tips
4. Undamped critical speed maps
5. Unbalance response analysis
6. Rotordynamic instability
7. High pressure compressor stability analysis
8. Pump rotordynamic considerations
9. Fluid-film bearing types
10. Tilting-pad bearings
11. Specialized bearings (i.e., magnetic bearings, foil bearings, etc.)
12. Seals
13. Undamped torsional analysis
14. Torsional Campbell diagrams
15. Variable frequency drives
16. Torsional response analysis
17. Synchronous motor start-up analysis
18. Reciprocating machine torsionals
19. Machinery specific considerations
20. API specifications and compliance
21. Case studies

The course, which will cover all of the above topics, will run from Monday through Thursday (24 through 27 April) and cost $2850 per participant. In order to provide the best compromise for attendees in all time zones, the course will start at 10:00 AM Eastern time and run to about 7:00 PM. There will be a half hour break for lunch and we will take a short (5-7 minute) break each hour. Additionally, we will ensure that there will be plenty of time for informal interaction with all three instructors, including breaks and lunches. Some of the benefits you would receive from taking this course include the following:

1. A greater familiarity with lateral and torsional rotordynamics which would allow you to communicate more effectively with experts in the field.

2. A better understanding of the meaning and validity of rotordynamic results obtained from consultants and/or in-house rotordynamic codes.

3. A better understanding of the rotordynamic causes of common rotating equipment problems which would assist you when trying to troubleshoot field and test-stand problems.

4. A better feel for which system elements play an important role in rotordynamic behavior and which ones have little impact. This would be valuable when evaluating potential design changes.

5. An appreciation that rotordynamic analysis can be performed in a practical and timely manner and does not require a “research project.”

6. An appreciation for the large role that rotordynamic behavior plays in the reliability of rotating equipment and for the importance of evaluating that behavior in the design stage.

To learn more about the course, please either respond directly to this message or call me personally at (802)558-0116. To register, all you need to do is go to

As always, if you have any questions about Dyrobes rotordynamics software, or would like a free trial copy, please contact us.