EFFECTS OF FLUID INERTIA ON FINITE-LENGTH SQUEEZE-FILM DAMPERS
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The influence of fluid inertia on the SFD force response to circular-centered motions of arbitrary amplitude is analyzed. For finite length locally sealed SFDs, integro-differential equations are derived in terms of the mean flow components. Numerical predictions using the finite element method show that the damping and added mass coefficients remain invariant as the Reynolds number increases from small values to a number equal to 10. An approximate finite length solution for the fluid film forces accounts for the fluid inertia effects as well as local end seal effects in symmetric SFD configurations. The approximate solution, strictly valid for small Reynolds numbers (Re less than 1), agrees well with the results from the numerical solution for most SFD configurations and orbit radii considered.
