Effects of static friction on the forced response of fictionally damped turbine blades

Alok Sinha, J. H. Griffin

    Research output: Contribution to journalArticlepeer-review

    64 Scopus citations

    Abstract

    The effect of static friction on the design of flexible blade-to-ground vibration dampers used in gas turbine engines is investigated. It is found that for γ (ratio of dynamic and static friction coefficients) less than I, the steady-state response is essentially harmonic when the damper slip load, S, is small. However, as S increases beyond a certain value, the steady-state response ceases to be simply harmonic and, while still periodic, is a more complex waveform. The transition slip load is found to be lower for smaller γ. The maximum possible reduction in vibratory stresses increases as γ decreases. These analytical results are compared with those from the conventional numerical time integration method. In addition, an efficient time integration algorithm is described which can be used to predict the peak displacements of the transition solution without tracing the whole waveform, a useful procedure when no harmonic steady-state solution exists. The conditions under which blade response can be adequately modeled by simulating only dynamic friction are established.

    Original languageEnglish (US)
    Pages (from-to)65-69
    Number of pages5
    JournalJournal of Engineering for Gas Turbines and Power
    Volume106
    Issue number1
    DOIs
    StatePublished - Jan 1 1984

    All Science Journal Classification (ASJC) codes

    • Nuclear Energy and Engineering
    • Fuel Technology
    • Aerospace Engineering
    • Energy Engineering and Power Technology
    • Mechanical Engineering

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