Author(s): Naihao Li; Xu Qin; Liangliang Lu; Fang Li; Li Zhou; Samuli Hanninen; Pentti Kujala
Linked Author(s):
Keywords: Inverse analysis; Ice loads; Ice class propeller; Polar ship
Abstract: This paper focuses on the inverse analysis of ice loads on propeller shaft system during navigation in icy waters. Firstly, based on the modal superposition method, the torque inversion at the blade root is achieved based on the vibration response at a certain location on the shaft system. Subsequently, according to the characteristics of the structural response equation of the propeller shaft system under dynamic loads, the Tikhonov regularization method is adopted to establish the objective function for the inverse analysis of propeller dynamic loads based on the torque at the propeller blade root. The verification results of the finite element method show that the inverse calculation results are consistent with the theoretical dynamic load results, with a correlation coefficient of over 0.96, and the maximum peak error is controlled within 6%, proving the accuracy of this inverse method. This is of great significance for improving the navigation safety of polar ships.
Year: 2026