Abstract
The accuracy and utility of rotordynamic models for machinery systems are greatly affected by the accuracy of the constituent dynamic bearing models. Primarily, the dynamic behavior of bearings is modeled as linear combination of mass, damping, and stiffness coefficients that are predicted from a perturbed Reynolds equation. In the present paper, an alternative method using Computational Fluid Dynamics (CFD) with a moving boundary is used to predict the dynamic coefficients of slider bearings and the results are compared with the more commonly employed perturbed Reynolds equation model. A linear slider bearing geometry is investigated and the results serve as precursors to similar investigations involving the more complex journal bearing geometries. Time and frequency domain methods for the estimation of dynamic coefficients are shown to give comparable results. For CFD with a moving boundary, temporal inertia is found to have a significant effect for a reduced, squeeze Reynolds number less than one. The temporal inertia effect is captured through an added mass coefficient within the dynamic model of the bearing.
Highlights
Fluid Dynamics (CFD) with a moving boundary in lieu of the more commonly applied perturbedReynolds equation
The thrust of this paper is to introduce an alternative method for the prediction of the dynamic coefficients of bearings through the use of transient Reynolds equation and transient Computational
Prior to examining the dynamic coefficients evaluated using the transient Reynolds equation or Computational Fluid Dynamics (CFD) with a moving boundary, the steady-state load predicted for the linear slider bearing is compared between the Reynolds equation and CFD
Summary
Fluid Dynamics (CFD) with a moving boundary in lieu of the more commonly applied perturbed. Seminal work has been performed to determine the effects of advective fluid inertia on steady flow, pressure, and loads generated by both slider and journal bearings. These efforts focused on improving the computational tools available to the lubrication engineering community to predict bearing properties under steady conditions. Lin and Hung [13] studied slider bearings with exponential and linear film profiles, and took into consideration the bearing squeeze action They applied small amplitude oscillations about the steady state position in order to obtain a perturbed form of the Reynolds equation. The dynamic damping coefficient was obtained by differentiating the same force with respect to the squeeze velocity
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
