Research On Slamming Response Technology Of Trimaran

The intense slamming phenomenon will occur at the bottom and connecting bridge indeuced by heave and roll of the trimaran. Slamming involves gas-liquid-solid mutual coupling, whose process is complex. So it's difficult to build a theoretical model to simulate the events. Therefore exploring an engineering calculation method is effective to solve the relationship between the pressure, the impact velocity and the shape of the hull section.Structure impact is a transient process, which is characterized by a short interval and a large slamming pressure. The instantaneous momentum of slamming can cause deformation of the local structure, even the structural failure and collapse.Based on the background mentioned above, the main research contents are as follows,1. The engineering calculation method of the slamming pressure of trimaran is researched. The added mass cased by wet-deck slamming is discussed. Based on the flat slamming theory, the regressive equation of wet-deck slamming peak pressure is carried out. Space-time distribution of slamming pressure along the bottom and wet-deck is given.2. The dynamic response characteristics of the slamming are solved by using direct transient response analysis method. The Von-mises, X-component and Y-component stresses of the elements in the time domain are calculated. Then, the distribution disciplinarian of stresses along the length and width of the hull are analyzed.3. The key technologies of numerical emulation on warter entry of typical profile of trimaran are discussed by using MSC.Dytran software. The process of wet-deck slamming is simulated. The slamming pressure on wet-deck is obtained, which is compared with the result calculated with engineering method.