Research On Strength And Impact Environment Of Large Diameter Emergency Escape Cabin

As one of the core strengths of the modern navy,the submarine has been favored by navies for its unique combat mode since its birth.However,with the continuous advancement of modern technology and anti-potential,it poses a higher challenge to the submarine’s own safety and reliability.Once the submarine has sunk in an accident,it will be a catastrophic consequence for the crew.In this emergency,the submarine emergency escape cabin is particularly critical,as an independent and flexible escape escape device,to improve the crash situation.The survival rate of the crew has an important role,compared with the traditional passive waiting for outside rescue has an unparalleled advantage.This thesis focuses on the submarine emergency escape cabin,focusing on the design of the pressure shell structure,strength check,optimization design,impact environment during release and other aspects.Firstly,the basic performance of active escape cabins at home and abroad is analyzed.It is found that the diameter of the escape cabin is small and the carrying capacity is weak.Therefore,the concept of large-diameter emergency escape cabin is proposed,and the escape cabin is made of materials and The design of the type and the main scale are given,and the preliminary design scheme of the pressure-resistant shell structure is given.Secondly,for the preliminary design of the pressure-resistant shell structure,according to the requirements of GJB/Z 21A-2001 "Submarine Structure Design Calculation Method"(hereinafter referred to as "Specification"),the strength and stability calculations are checked,and ABAQUS is used.The software establishes a finite element analysis model,and obtains the stress,displacement and buckling response of the pressure shell under the limit water depth,and checks the special part that cannot calculate the strength using the "Specifications".It is also a kind of calculation result of the "Specification".Review.The theoretical and numerical methods are used to verify that the designed pressure shell strength is satisfactory.Thirdly,through the exploration of the optimization of the pressure-resistant shell structure,the mathematical model of the optimal design of the ring-ribbed cylindrical shell in the middle section of the escape cabin is established.The thickness of the shell,the spacing of the ribs and the size of the ribs are used as design variables to achieve the strength and stability of the Code.And the T-size itself is a constraint condition,with the lowest overall weight as the objective function,optimized by genetic algorithm,and the solution with the lightest weight under the constraint condition is obtained;as for the thickness of the spherical shell and the top hatch cover at both ends of the escape cabin,the thickness is adopted.The finite element iterative method determines the minimum size,from which the lightest escape cabin optimization design can be derived.Finally,the release mechanism of the existing escape cabin is analyzed and analyzed.In view of the problem that the speed of releasing the boat is slow or the carton is generated,the release method of the projectile for the escape cabin is proposed,that is,the airbag is used for ejection,and the airbag is rapidly inflated.The ejection thrust is generated so that the escape cabin can be quickly removed from the boat.By consulting relevant data and stress analysis of the escape cabin,the minimum pressure load required for the escape cabin is estimated,and various working conditions are set at the same time as the impact excitation source to predict and analyze the impact environment of the escape cabin.The reliability of the ejection method and possible safety hazards provide reference for the escape method of the escape capsule in the future.