Stability Margin Optimization for Unsymmetrical Rotor/Stator Dynamic System

This paper introduces a computer simulation tool that optimizes the damping forces acting on a stationary body to maximize the stability margin of a rotating body. The proposed method is highly efficient and can be used to investigate the dynamic stability of any general rotating system, even those that are non-axisymmetric. To achieve this, the authors combine Floquet theory and Hill’s method to create an analytical tool that operates in the frequency domain and can compute the stability of unsymmetrical flexible rotor and stator systems in a shorter computation time. Using the simulation tool, the authors explore various damping design configurations for an I4 internal combustion engine to identify the optimal damping values that can maximize dynamic stability. The simulation results demonstrate how the damping of both the stator (engine block) and rotor can be optimized to achieve maximum dynamic stability. Overall, this paper presents a practical and effective approach to designing damping systems that can improve the stability of rotating machinery.