A frequency domain, forced vibration technique for obtaining estimates of the direct fluid damping, inertial and stiffness coefficients of a squeeze-film bearing is presented. The three coefficients are estimated through a linear, least-squares regression analysis performed on data obtained from a sequence of forced vibration tests, conducted using single sinusoids of differing frequencies. The method is applied to experimental data obtained from a squeeze-film damper with a central circumferential groove and no end seals. In addition to accurate estimates of damping coefficients, reliable estimates of inertial and stiffness coefficients are obtained.
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