Study of Multiplicative Load on the Misaligned Rotor-AMB System

This study examines the dynamic response of a two-rotor system under misalignment, imbalance and residual bow. The impact of bow and unbalance on the system’s behavior is analyzed through a parametric study with varying bow amplitude relative to unbalance, while keeping another parameters constant. This innovative approach to analyzing the compound effect of bow and misalignment on the system’s dynamics is a unique contribution to the field of rotor dynamics. To examine the system’s dynamic behavior, a basic model of a rotor-AMB system is considered with certain assumptions, and an active magnetic bearing (AMB) is utilized to mitigate vibration brought on by faults. To simulate misalignment behavior, an excitation function is selected, which generates both odd and even harmonics in the spectrum plot. The existence of a bow in a misaligned rotor system causes multiplicative loads that primarily influence multi-harmonics other than the 1x harmonic, making it challenging to interpret the system’s behavior. The steady-state reactions are numerically simulated and analyzes the time domain, orbit, and displacement spectra in order to draw attention to the harmonic components arises from the combination of faults. The results show that the interaction between bow and misalignment can significantly impact the system’s behavior, leading to increased vibration amplitudes and potential failure modes. The findings of this study can aid in the design and maintenance of rotating machinery to mitigate the effects of bow and misalignment and ensure safe and reliable operation.