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Structural mechanics
Structural mechanics

Rotor Dynamics — Dynamic Simulation of Rotating Structures

The virtual rotor test bench: from dynamic balancing to imbalance response


Training Expert

In this training you learn to understand and to simulate rotor dynamic effects. This training is offered as a 2-day course.

2 days

Basic knowledge of Ansys Mechanical

Software used
Ansys Mechanical, Tribo-X inside Ansys

  • Considering simple and complex bearing properties
  • Creating a Campbell diagram for a Laval rotor
  • Determining the imbalance response of a rotor
  • “Tribo-X inside Ansys” license free of charge for 3 months


Rotodynamic deals with the analysis of the dynamic behavior of rotating structures (such as rotors in electric motors, generators, turbines, wind turbines, centrifuges and hard drives with their characteristic dynamic behavior). The objective of rotodynamic FE simulation is to ensure the stable operation of a rotor in a stationary state as well as during start-up. This training introduces the modeling options (1D, 2.5D, 3D) available for this purpose in Ansys Mechanical.

The practical exercises focus particularly on the gyroscopic effect of rotors as well as the typical excitation mechanisms. Special result representations such as the Campbell diagram or the critical speeds are also addressed. One segment of the training is dedicated to the various FE possibilities for bearing modeling through to the CMS model, e.g. as a replacement for a resonant support structure. Using simple practical examples, you will learn how to use the software products correctly, giving you a solid basis to enable you to process your own projects.

This training is aimed at all engineers working with the design and calculation of rotating structures to help them forecast the dynamic behavior of a design or for analysis of existing problem cases and who would like to be able to apply the finite element method.

Detailed agenda for this 2-day training

Day 1

01 Description of rotating machines

  • Everything is rotating: Specific definitions and nomenclatures of rotor dynamics
  • The different reference systems and their meaning
  • Demonstration: Campbell diagram of a rotating disk

02 Dynamic properties of rigid and deformable rotating structures

  • Balancing rigid bodies
  • Extension to flexible bodies
  • Influences of speed on the stiffness of flexible structures
  • The gyroscopic momentum
  • Exercise: dynamically balancing a CAD model in two planes

03 The successful way to the Campbell diagram

  • Influence of speed on the eigenfrequencies of rotating structures
  • Creating the Campbell diagram
  • Stability plots
  • Exercise: creating the Campbell diagram for a laval rotor

04 Harmonic analysis: influence of the imbalance on the rotation

  • Modeling imbalance in rotating systems
  • Determining the stationary imbalance response during spinning
  • Identifying critical speeds in the Campbell diagram
  • Exercise: determining the imbalance response of a gyro model

Day 2

05 Time-dependent effects – transient analysis

  • (Unsteady spinning of rotors
  • Passage of critical speeds
  • Orbit plots for transient spinning
  • Exercise: rotor whirling of a Jeffcott rotor

06 Reproducing the bearings of rotors

  • Methods for illustration of journal bearings and rolling bearings
  • Overhang rotor in a rigid stator
  • Extension to a flexible stator
  • Determining bearing properties of journal bearings with Tribo-X inside Ansys
  • Exercise: rotor spinning in orthotropic journal bearings
  • Exercise: determining journal bearing properties with Tribo-X inside Ansys

07 Methods for speeding up the analysis

  • Reducing models to the essentials
  • Special 2.5D elements to reduce the rotor
  • Reduction by the component mode synthesis method
  • Exercise: Campbell diagram for a 2.5D Jeffcott rotor

08 Cyclical symmetry – sector models

  • The duplicate-sector method
  • Harmonic index and nodal Diameter
  • Exercise: modal analysis and harmonic analysis on a sector model

Your Trainers

Klaus-Dieter Schönborn
CAE Engineer, CADFEM Germany GmbH, Stuttgart
Maik Handschick
CAE Engineer, CADFEM Germany GmbH, Berlin

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Jump start to practice!

To enable you to immediately start making use of your new knowledge we will provide you with a free 3-month duration Tribo-X inside Ansys license at the end of the course. 


Do you have questions on the training?

When will I receive the final confirmation for my training booking?

Straight after you sign up, an automatic confirmation of receipt will be sent to the email addresses you provided. Once you have successfully verified the data you provided, you will receive your personalized sign-up confirmation, containing further information on course fees, the billing address, etc., by email within two to three working days.  

As soon as the minimum number of attendees has been reached, you will receive a final training confirmation containing further information. If you have booked an on-site training, we recommend that you wait until you have received this final confirmation before booking your travel and accommodation.

If the minimum number of attendees is not reached, we reserve the right to cancel the training seven days before it is due to start at the latest. We are happy to inform you on changing your booking to an alternative date. Please note that we accept no liability for hotel or travel bookings that attendees have already made.

When is the sign-up deadline for a training?

Training places will generally be allocated based on the order in which attendees sign up. For this reason, we always recommend booking for your desired date as early as possible.

As long as a coures still has free places, it can be booked.

At what time do the training courses begin and end?

Usually the training courses start at 9:00 am and end at 5:00 pm of the respective local time. The actual course times will be stated in the booking confirmation. Please note that, depending on the training host, there may be a possible time shift between your and the provider's local time. Therefore all local times are provided with the valid time shift to Greenwich Mean Time (GMT). 

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