Modeling support effects - finite element and experimental modal methods

Jonathan R. Buckles, Keith E. Rouch, John R. Baker

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


The effects of support/foundation dynamics are often significant in high speed turbomachinery, and can affect the stability and response to unbalance. In some cases additional critical speeds are introduced, related to resonances in the foundation or interaction with rotor resonances of foundation resonances. This paper reviews several methods for representing these effects, including (1) reduced matrices from finite element substructures (ANSYS, for example), (2) matrices generated from modal data, and (3) direct use of experimental transfer functions. These methods are implemented in a finite element rotor program in a PC-DOS environment. The application of the methods to two laboratory rotor configurations described and results presented. Situations with a foundation resonance above and near the rotor critical are included. The importance of including coupling effects between supports is shown.

Original languageEnglish
Pages (from-to)9
Number of pages9
JournalAmerican Society of Mechanical Engineers (Paper)
StatePublished - 1996
EventProceedings of the 1996 International Gas Turbine and Aeroengine Congress & Exhibition - Burmingham, UK
Duration: Jun 10 1996Jun 13 1996

ASJC Scopus subject areas

  • Mechanical Engineering


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