Experimental and numerical investigation on dynamic characteristics of ship propulsion shafting under uncertainty based on displacement response

摘要

The ship propulsion shafting often has a lot of uncertainty due to the impact of dynamic factors during the operation. In order to investigate the dynamic characteristics of the propulsion shafting under uncertainty, the displacement responses were obtained utilizing the experiment and the numerical calculation based on a ship shafting test bench and the established nonparametric dynamic model. The results show that the dynamic characteristics of the propulsion shafting could be significantly affected by the uncertainty. With the increase of uncertainty, the fluctuation of the frequency response function gradually strengthens, the amplitude of the displacement response is enlarged, and the axis trajectory of the propulsion shafting becomes more complex. Therefore, it is essential to consider the uncertainty in the process of the dynamic design and analysis for the ship propulsion shafting.