Research On Additional Bending Moment Of Sail-assisted Ship Under The Condition Of Winds And Waves

Global warming is one of the most serious environmental problems,so energy conservation and environmental protection has been the top priority in the development of all countries.Compared with the traditional way of ship propulsion,sail-assisted navigation technology is not only pollution-free,but also can greatly reduce the fuel consumption of the ship.There are two main reasons for the change of the force on the ship with sail: one is the additional bending moment caused by thrust load,the other is the additional bending moment caused by inertia load.In this paper,the additional bending moment and its influence on the hull strength are studied:(1)This paper introduces the development history of sail assisted navigation,ship motion theory and the development of hull strength research.(2)Aqwa software is used to simulate and calculate in time domain,and the influence of ship’s main dimension,wind wave and other factors on ship’s longitudinal acceleration is obtained.Set the main dimensions of the ship and the factors such as wind and waves under bad conditions through the analysis of the impact.By comparing the longitudinal acceleration of numerical simulation with that of theoretical formula,the longitudinal acceleration of theoretical formula is modified,and the additional moment of inertia caused by sail is calculated.(3)Using FLUENT software to simulate wind tunnel test,the maximum lift coefficient of the sail is obtained,and the additional thrust moment of the sail on the hull is calculated.(4)The finite element model of the ship cabin is established,Choose the suitable working condition,and the influence of the additional bending moment generated by the sail on the longitudinal strength of the ship and the local strength of the joint between the sail and the ship is studied.Some suggestions on sail arrangement are given.