The Influence Of Wave Load On The Longitudinal And Local Strength Of The Hull

When the ship is sailing on the sea,it will suffer all kinds of extreme bad weather.When the wave reaches a certain degree,the deck waves will occur.On deck wave is a relatively common condition,affecting safety performance but on deck on ship performance,stability and structure of the ship,the main deck is formed on the deck wave will attack,attack near the deck may cause damage,even in attacking the hull structure under the action of instability caused by disastrous consequences.And after water on deck,water will flow freely in the deck,will have an impact on the upper deck of the building,and even cause the deck of the building strength loss of stability,so the water on deck for ship longitudinal strength and local strength is very important.First,the research status at home and abroad on the waves of the deck are analyzed.The analysis showed that the ship's deck wave basically is calculated and checked according to the empirical formula,simulation experiments and simulation method are feasible without water on deck,are simulated on deck wave by numerical method.The analysis found that this method can not accurately simulate the nonlinear slamming effect of waves on the deck.It is only the smooth flow of waves that can not truly reflect the slamming effect of the wave load received by the hull.Therefore,this paper proposes the use of dam breaks.The theory and the fall theory analyze the waves on the deck.The true nonlinear slamming load generated by the upper wave load is actually obtained through experimental methods.Second,through the theoretical research of dam break and drop type,and verify the feasibility of the two methods by theoretical method,calculate the two-dimensional dam break deck and the falling deck waves,and verify the feasibility of the method from a two-dimensional perspective.The numerical wave program is written by the three wave of the Stokes wave,and the two-dimensional numerical wave is calculated in the two-dimensional numerical pond.It is verified that the numerical wave can be used as a deck wave to verify the influence of deck waves on the hull performance when the ship is sailing.Third,the three-dimensional numerical wave making deck wave is carried out in the numerical pond,and the influence of longitudinal and local strength is analyzed;After that,the influence of the three dimensional dam break deck wave on the longitudinal and localstrength of ship hull during the wave motion is simulated;Finally,the deck waves on the decks are analyzed.The upper and middle waves can accurately simulate the extreme cases.When the waves are high enough,the influence of deck waves on the longitudinal strength and local strength of the ship will be established at this time.The key point of this method is to accurately simulate the process of water falling at a certain height against the deck and superstructure.It can simulate the attacking effect of waves on hull in the process of roll over.Finally,three methods of numerical wave,dam break and free fall are used to simulate the deck surf.The numerical wave can only simulate the influence of stable waves on the hull,and the deck waves in the form of dam break and free fall can accurately simulate the attacking effect of waves on deck and superstructure.The process of wave reproduction of real ship sailing in the sea when the deck,influence and mechanism of ship longitudinal strength and local strength,and through this policy is built on the hull put forward some protective measures to prevent because of damage caused by water on deck vessel.