Rotor Dynamics — Dynamic Simulation of Rotating Structures
The virtual rotor test bench: from dynamic balancing to imbalance response
In this training you learn to understand and to simulate rotor dynamic effects. This training is offered as a 2-day course.
Duration
2 days
Prerequisites
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
Description
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
Maik Handschick
Placement in the CADFEM Learning Pathway
Participant data
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