Isolation and Expansion of Gyroscopic Effects Using Frequency-Based Substructuring

Michael Kreutz, Daniel J. Rixen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Due to gyroscopic effects, the dynamics of rotating machinery depend on the rotational speed. In order to experimentally determine a machine’s dynamics, measurements for each rotational speed are required. A method using frequency-based substructuring to extrapolate the speed-dependent dynamics is presented for a system with gyroscopic forces. In an isolation step, the dynamics of the rotating system are decoupled from the dynamics of the nonrotating system, which yields the gyroscopic terms. In an expansion step, the isolated gyroscopic terms can be extrapolated to an arbitrary speed. This is coupled with the dynamics of the nonrotating system for the dynamics of the rotating system at an arbitrary speed. Here, the frequency response function must only be measured for the rotor at standstill and at one rotational speed. The FBS method gives good results as long as the interface is rigid enough. Also, another method that divides the dynamic stiffness into symmetric and skew-symmetric parts is presented, which only needs FRFs at one rotational speed. It gives slightly worse results than the FBS method in the current implementation.

Original languageEnglish
Title of host publicationDynamic Substructures, Volume 4 - Proceedings of the 41st IMAC, A Conference and Exposition on Structural Dynamics 2023
EditorsMatthew Allen, Walter D’Ambrogio, Dan Roettgen
PublisherSpringer
Pages89-97
Number of pages9
ISBN (Print)9783031366932
DOIs
StatePublished - 2024
EventProceedings of the 41st IMAC, A Conference and Exposition on Structural Dynamics 2023 - Austin, United States
Duration: 13 Feb 202316 Feb 2023

Publication series

NameConference Proceedings of the Society for Experimental Mechanics Series
ISSN (Print)2191-5644
ISSN (Electronic)2191-5652

Conference

ConferenceProceedings of the 41st IMAC, A Conference and Exposition on Structural Dynamics 2023
Country/TerritoryUnited States
CityAustin
Period13/02/2316/02/23

Keywords

  • FRF
  • Gyroscopic
  • Rotor
  • Substructuring
  • VPT

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