Abstract
In order to investigate the natural vibration characteristics of ship propulsion shafting under uncertainties, the random matrixes of mass, damping, and stiffness are constructed based on a nonparametric approach. The effect of uncertainties on the natural vibration characteristics of ship propulsion shafting is discussed by the distribution characteristics of natural frequency. Meanwhile, the natural frequency identification experiment of ship propulsion shafting was used to illustrate the effectiveness of the nonparametric modelling method. The results show that different levels of uncertainties in stiffness, mass and damping matrixes could be obtained by controlling the divergence parameter. The natural frequency could fluctuate significantly under uncertainties. Furthermore, the uncertainties of stiffness and mass have significant impact on the natural frequency. However, the uncertainty in damping has little influence on it. Therefore, it is essential to consider the uncertainties in the analysis of natural vibration characteristics of the ship propulsion shafting.
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