Finite element vibration analysis of a rotating shaft system with an open crack by the harmonic excitation

The vibration of the rotating shaft with an open crack under the harmonic excitation is investigated. The concise FEM rotating shaft model for the quantitative analysis, which was developed in the previous studies, is utilized, and the fundamental equations governing the vibration of the cracked shaft with the harmonic excitation are deduced. Furthermore, the experimental system using the active magnetic bearing for the harmonic excitation is developed, and the validity of the obtained theoretical results are confirmed experimentally.