Study On Slamming Loads Of Large Flare Structure Of Ship Bow

When ship bows with large flares encounter slamming sailing on seaway,its inherent transient and strong non-linear detection vary significantly,therefore,the traditional trips theory cannot give reliable result any more for not concluding the non-linearity factor.Based on the theory of two-dimension section and coupled with research means of model test and fully nonlinear boundary element method,this paper gives a method to forecast the slamming load bows on large flares of ship,with considering the non-linear factors and gravity.Research work is made on the following aspects in this paper:1、Research summary on the slamming load coefficient.This paper analyzes the applicability and limitations of the different models on water impact problem,containing the Von Karman theory and the Wagner theory.Then,several research conclusions are summarized based on the theory,in order to provide evidence for the author’s research.2、Carrying on falling model slamming test of large flares.Aiming at large flares structures slamming,a wedge model and 3-D ship bow model were designed to performing free falling slamming test.Through which the characteristics of peak load and load distribution of slamming is studied and the result can be validate the reliability of numerical simulation.3、Developing a numerical calculation to solve the problem of two-dimension body slamming into water based on fully nonlinear boundary element method with its theory and realizing process comprehensively described.Numerical solution to loads of two-dimension wedge slamming into water is provided,with the patterns discussed.To further verify the numerical method,the numerical results are compared with previous researches and the model test.4、Research on simulation of slamming load.In example of certain ship with large flares,slamming loads of points at certain position are calculated by using numerical method.Through researches above,a numerical method is provided for slamming problem of ships with large flares,which can be referred to in the strength design of bow flares structures.