Computational studies of the unbalance response of a whole aero-engine model with squeeze-film bearings

Philip Bonello, Pham Minh Hai

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


    The computation of the unbalance vibration response of aero-engine assemblies fitted with nonlinear bearings requires the retention of a very large number of modes for reliable results. This renders most previously proposed nonlinear solvers unsuitable for this application. This paper presents three methods for the efficient solution of the problem. The first method is the recently developed impulsive receptance method (IRM). The second method is a reformulation of the Newmark-Beta method. In addition to these two time-domain methods, a whole-engine receptance harmonic balance method (RHBM) is introduced that allows, for the first time, the frequency domain calculation of the periodic vibration response of a real engine. All three methods use modal data calculated from a one-off analysis of the linear part of the engine at zero speed. Simulations on a realistically-sized representative twin-spool engine model with squeeze-film damper bearings provide evidence that the popular Newmark-Beta method can be unreliable for large order nonlinear systems. The excellent correlation between the IRM and RHBM results demonstrates the efficacy of these two complementary tools in the computational analysis of realistic whole-engine models. Copyright © 2009 by ASME.
    Original languageEnglish
    Title of host publicationProceedings of the ASME Turbo Expo|Proc. ASME Turbo Expo
    Number of pages9
    Publication statusPublished - 2009
    Event2009 ASME Turbo Expo - Orlando, FL, United States
    Duration: 8 Jun 200912 Jun 2009


    Conference2009 ASME Turbo Expo
    Country/TerritoryUnited States
    CityOrlando, FL


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