Whirling and stability of flywheel systems, part II: Comparison of numerical results obtained with combined and lumped parameter models

Abstract In this paper the theoretical analyses of Part I are applied to some flywheel systems to provide information to designers. The analyses are utilized to study three specific prototype flywheel systems: a multi-material ring type (Garrett AiResearch), a constant-thickness-disk ring type (General Electric), and a tapered-thickness-disk type (Lawrence Livermore National Laboratory). In addition, the effects of the following flywheel design parameters on system dynamics are investigated: flywheel mass, flywheel diametral and polar mass moments of inertia, location of flywheel diametral and polar mass moments of inertia, location of flywheel mass center from the lower end of the quill shaft, quill shaft length, lower turbine-bearing support stiffness, and equivalent viscous damping coefficient of the external damper.