Higher Edu - Research dev card
Development from the higher education and research community
  • Creation or important update: 25/11/11
  • Minor correction: 23/11/12

TORSION : prediction of the dynamic behavior of rotors in torsion

This software was developed (or is under development) within the higher education and research community. Its stability can vary (see fields below) and its working state is not guaranteed.
  • System:
  • Current version: TORSION version 1.0.0 - December 2007
  • License(s): Proprietary licence
  • Status: stable release
  • Support: maintained, ongoing development
  • Designer(s): Guy FERRARIS, Marie Ange ANDRIANOELY
  • Contact designer(s):
  • Laboratory, service:


General software features

This finite element computer program is devoted to the steady state or the transient dynamic behavior of multirotors in torsion.

Node: 2 degrees of freedom.
Shaft: two-node beam elements in torsion.
Disk: one-node disk element, rigid.
Supplementary stiffness, mass, damping elements.
Discrete element.

Statics' Prediction: deflection of rotor in torsion subject to several torques.

Dynamic Prediction:
In steady state: frequencies, modes, harmonic force response and energies in elements.
In transient motion: couples, speeds are function of time.

Context in which the software is used

TORSION is used for rotating machinery design and for the modification of the architecture of existing machines.

TORSION is used for training at INSA-Lyon, in France and in foreign countries.

The expertise of the laboratory has been greatly gained from contracts with companies and state organizations over a period of nearly 30 years.

Publications related to the software

The software is based on the theory presented in:
1. Rotordynamics Prediction in Engineering by Michel Lalanne and Guy Ferraris. J. Wiley, 254 p, 2nd edition 1988. ISBN 0 471 97288 6
2. Dynamic problems concerning the speed of rotation increase of a turbine –blower assembly. A Castilho G Jacquet-Richardet, M.Lalanne, J of Sound and Vibration 1998 215(1), 47-62.

TORSION Manuel d'utilisation
Version 1.0.0 2007