Nonlinear Analysis of Dynamical Characteristics of the Annular Plain Seal Whirling with Circular Motion using Bulk-flow Model

Abstract

In rotating machinery, the rotor often whirls around static eccentricity position. The dynamic characteristics of seal has strong nonlinearity, and it effects on the case with the influence of static eccentricity. However, there are not so many studies that have investigated the dynamic characteristics considering the influence of large static eccentricity. This paper describes a method for the analysis of dynamic characteristic of annular plain seal in case of circular whirl with relatively large amplitude and static eccentricity using bulk-flow model. By considering of higher order components and coupled components when performing perturbation expansion, nonlinear components are analyzed. As a result, order asynchronous component of the rotordynamic fluid force are observed and explained.