This paper presents a multileaf foil bearing (MLFB), which consists of four resilient top foils and four stiff bump foils underneath; thus, a high supporting capacity and a high damping capacity can be achieved. A specially designed test rig is used to identify the structural stiffness and damping coefficients of the MLFB. The rotor of the test rig is supported by two journal MLFBs and a thrust active magnetic bearing (AMB) and the static and dynamic loads are applied by two radial AMBs. The tests on MLFBs were conducted under conditions of no shaft rotation at different angular positions and journal displacements with different excitation frequency. A frequency domain identification method is presented to determine the stiffness and damping coefficients. Static measurements show nonlinear deflections with applied forces, which varies with the orientation of the load angular position. The dynamic measurements show that the stiffness and equivalent viscous damping change with the excitation frequency. Furthermore, the stiffness and damping coefficients are related to the operating position where dynamic load tests were conducted. The investigation provides extensive measurements of the static and dynamic characteristics of the MLFB. These results can serve as a benchmark for the calibration of analytical tools under development.
Structural Stiffness and Damping Coefficients of a Multileaf Foil Bearing With Bump Foils Underneath
Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 28, 2013; final manuscript received November 13, 2013; published online December 12, 2013. Assoc. Editor: Jerzy T. Sawicki.
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Tian, Y., Sun, Y., and Yu, L. (December 12, 2013). "Structural Stiffness and Damping Coefficients of a Multileaf Foil Bearing With Bump Foils Underneath." ASME. J. Eng. Gas Turbines Power. April 2014; 136(4): 044501. https://doi.org/10.1115/1.4026054
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