Ain Shams Engineering Journal (Sep 2024)
Mechanical behavior analysis of a non-single-point stranded ship under the combined action of wind, waves and tides
Abstract
To investigate the influence of wind, waves and tides on the floating state, stability and strength of stranded ships, based on the previous literature, this paper summarizes three kinds of stranded modes of stranded ships and establishes a mechanical model of the action of wind, waves and tides on stranded ships. The stability, ground force, wind moment, shear force, bending moment, and torque were obtained by simulating the floating state change course of the stranded ship in different wind, wave, and tidal environments. The mechanical analysis and calculation of the stranded ship under different working cases show that wind and waves will cause the ship to capsize under the 4-level sea condition. Under 3-level sea conditions, the balanced arrangement of multiple stranded points limits the floating state of the ship and ensures its stability. In a wave period, the maximum stability of each working case exceeded the stability of the other environments in each working case by at least 0.156 m, 0.169 m, 0.044 m and 0.502 m, respectively. When the sea condition is level 4, only under the action of waves is the displacement of the stranded ship less than that of the other working cases, and the total amount of ground force is greater than that of the other working cases, which indicates that the wave height has a significant effect on the mechanical distribution of the stranded ship. The bending moment distribution of the ship is mainly affected by the load; however, the ground force and displacement can weaken the effect of the load to a certain extent. The differences in the negative maximum bending moment between the trough environment and the peak environment in each working case are 24.158 MN.m, 24.459 MN.m, −4.173 MN.m, and 70.616 MN.m, respectively. Under only wave cases, the maximum positive torque value at the longitudinal coordinate of −50 is more than twice the maximum positive torque value under the wind and wave cases.
