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Document Type

Original Study

Subject Areas

Mechanical Design

Keywords

herringbone thrust bearing; finite difference method; perturbation analysis; second order analysis; dynamic coefficients.

Abstract

A herringbone grooved hydrodynamic thrust bearing is a specialized type of bearing designed to support axial loads in rotating machinery. It is commonly used in turbines, compressors, and pumps. It utilizes a hydrodynamic lubrication mechanism to reduce friction and wear between the rotating and stationary parts. In this paper, a second order dynamic analysis for the herringbone grooved thrust bearing based on the finite perturbation abroach is performed. The Reynolds equation, expressed in polar coordinates, was differentiated to analyze small perturbations from the equilibrium state. This process yielded the first order and then the second-order equations describing these perturbations. Reynold's equation and its perturbed equations were solved using the finite difference approach and the over-relation method to get the static and dynamic parameters of the thrust bearing. A 3-DOF model was used in this study to get the bearing dynamic coefficients (linear in z, rotation in x and y). Different operating conditions were used to study their effect on the bearing coefficients, such as misalignment angle and rotation speed. The results are verified with the previous literatures, and perturbation analysis with three different methods is conducted to calculate the bearing force and moments for model validation and the effect of misalignment angle and rotational speed on the dynamic coefficients. The findings indicate that misalignment and rotational speed significantly influenced the bearing’s dynamic coefficients and the variations in rotational speed have no impact on the damping coefficients

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