Rubbing between rotating and stationary surfaces in turbomachinery can result in catastrophic failures if not caught quickly. Removing the rub impact can then often require time consuming and expensive solutions including field balancing or magnetic bearing systems. However, simple changes in bearing dynamics via bearing and lubricant adjustment could provide for a faster and cheaper alternative. In this work, a three-disk rotor was examined analytically for nonlinear rotordynamic behavior due to an unbalance-driven rub. The rotordynamic solution was obtained using nonlinear and steady state finite element models to demonstrate the effect of the rub impact on the dynamic response of the machine. A thermoelastohydrodynamic (TEHD) model of tilting pad journal bearing performance was also used to study the possible removal of the rub impact by making minor adjustments to bearing parameters including preload, clearance, pad orientation, and lubricant properties. Gas-expanded lubricants (GELs), tunable mixtures of synthetic oil and carbon dioxide that have been proposed as a means to provide control in bearing-rotor systems, were also considered for their possible role in controlling the rub. The TEHD model provided a range of bearing inputs to the rotor models in the form of stiffness and damping coefficients. Results from the rotordynamic analyses included an assessment of critical speeds, peak rotor displacements, and vibration characteristics. Individual bearing parameter adjustments were found to have smaller, though still significant effects on the response of the machine. Overall, it was found that by adjusting a combination of these bearing parameters, the peak displacement of the rotor could be reduced by large enough amounts to remove the rub impact in the machine, hence providing a simple approach to solving rub impact problems in rotating machinery caused by excessive vibration.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Nonlinear Analysis of Rub Impact in a Three-Disk Rotor and Correction Via Bearing and Lubricant Adjustment




    Publication date :

    2015




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English



    Classification :

    BKL:    52.30 / 52.52 / 52.52 Thermische Energieerzeugung, Wärmetechnik / 52.30 Strömungskraftmaschinen, Turbomaschinen



    LUBRICATED SLIDING BEARING WITH ADJUSTMENT OF PROPERTY OF LUBRICANT IN CERTAIN PART OF BEARING GAP

    STEFAN GEORGE EMILE LAMPAERT / RONALD ADRIANUS JOHANNES VAN OSTAYEN | European Patent Office | 2023

    Free access


    LUBRICANT SUPPORTED ROTOR ARCHITECTURES

    REMBOSKI DONALD / DEDO JACQUELINE | European Patent Office | 2022

    Free access

    LUBRICANT SUPPORTED ROTOR ARCHITECTURES

    REMBOSKI DONALD / DEDO JACQUELINE | European Patent Office | 2021

    Free access

    LUBRICANT SUPPORTED EXTERNAL ROTOR ARCHITECTURES

    REMBOSKI DONALD / DEDO JACQUELINE | European Patent Office | 2021

    Free access