Transient Response of Externally Pressurized Fluid Film Bearings©
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The transient response of a point-mass rotor supported in turbulent flow, externally pressurized fluid film bearings is presented. The equations of motion are solved numerically with local linearization at each integration time step. The bearing reaction forces are calculated from the numerical solution of unsteady bulk-flow equations including fluid inertia, turbulence, variable fluid properties and thermal energy transport. Examples for the transient response of damper seals and hydrostatic bearings under a variety of external loads are presented. Transient responses based on an approximate model which uses constant rotordynamic force coefficients are also included and shown to compare well with the full nonlinear responses. The nonlinear model needs small time steps with large execution times, while the simple linear model provides reliable results in a minute fraction of time. © 1997 Taylor & Francis Group, LLC.
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