Finite Element Simulation And Analysis Of Fluid-solid Coupling For Damage Of Experimental Torpedo Floating Bag

In today’s era,the meaning of a powerful navy refers to the political,economic,diplomatic,military and other aspects of a country.The torpedo has excellent performances such as concealment and destructive power due to its unique combat environment,which makes the torpedo popular in naval weapons and equipment.High-speed,long-range,high hit rate,good maneuverability and other excellent performances are important directions for the development of torpedoes in the world.At the same time,there are more and more sophisticated instruments inside the torpedo,which makes almost all the torpedos in negative buoyancy status.Therefore,the experimental torpedo which are used for the torpedo training and calibration is also in negative buoyancy state,and the experimental torpedo needs to float to the surface automatically after completing the scheduled navigation mission,and wait for the salvage and recovery of the staff.A research institute of the China Shipbuilding Industry Group has developed a snorkeling device for a certain type of torpedo.When the experimental toepedo completed its established tasks in the operation,during the process of floating on the surface of the sea and waiting for the salvage of the staff,the floating bag was torn due to the impact of the waves.A major loss of lightning sinking into the sea.This article takes this as the source of the research,and mainly analyzes the following aspects of the floating bladder floating device:Firstly,the research status and theoretical basis of finite element,fluid-structure coupling and wave theory are briefly introduced.Based on the theory of the second-order Stokes wave,a three-dimensional numerical wave trough is established by using the fluid analysis software Fluent,and the numerical wave is realized by the boundary wave-making method and the artificial damping method of adding the source term in the fluid control equation.The wave making and wave-eliminating function of the sink.According to the data analysis derived in the process of simulating the second-order Stokes wave,the wave-making and wave-eliminating functions of the three-dimensional numerical wave trough are effective.Secondly,in view of the fact that the float material is a composite material obtained by vulcanizing a neoprene latex and PA-1313 nylon,the relevant mechanical properties are unknown.The test piece was made into the finished product of the floating capsule,and the longitudinal tensile test was carried out on the universal material testing machine to obtain the mechanical properties such as elastic modulus,Poisson’s ratio and maximum failure stress of the material.Finally,based on the established three-dimensional numerical wave trough and the parameters related to the float material measured by the experiment,the Workbench software was used to analyze the fluid-solid coupling of the furious flotation device.The maximum dangerous position of the floating sac under the impact of the waves and the stress at the position provide an important theoretical basis for the further optimization of the snorkeling device.The maximum dangerous position and stress of the buoy under the impact of sea waves are obtained,which provides an important theoretical basis for further optimization of the mine-handling buoy device.