Parametric Study of Dynamic Analysis Focusing on the Foil Structure of a Gas Foil Journal Bearing

摘要

We performed a dynamic analysis of a foil structure under a range of loads using commercial FE software and actual tests. A dynamic load of between 2 and 8 N was applied by an electromagnetic shaker. The frequency range was from 100 to 600 Hz. A static force of between 40 and 140 N was applied by using a tension wire attached to the housing. To facilitate the analysis, the FE model assumed a fully circular geometry and a 2D wire mesh when describing the actual gas foil journal bearing. The excitation direction was assumed to have a single degree of freedom. The dynamic analysis permitted the evaluation of the stiffness and the damping coefficient of the 1D characteristic with the circular geometry. The dynamic coefficient was calculated using the relationship between the displacement and excitation force within the defined frequency range.