Study On Pressure Hull Structure Design Of Large Deep Diving Submarine

Nowadays, the trend of submarine towards large dimension and deep diving has strategic significance. The strength and stability analysis of pressure hull is an important subject in the submarine design. This thesis focuses on the attention on the study of pressure hull structure design of large deep diving submarine.In this thesis, the expression of stress modification coefficients will be given when the intermediate stiffeners are set on the ring-stiffened cylindrical shell. Analyzing the physical meaning of y which is the coefficient of bending differentiating equation, the effect of y on stress modification coefficients is considered, when the value of y is more than 1.The theoretical critical pressure of the local stability will be improved further, Respectively considering the non-uniformity of circumferential stress distribution over the ring-stiffened cylindrical shell and the torsion of the frame. Comparing with the model test data the result of the calculation is more close to that from the formula in "Design and Calculation Standard for Submarine Structure (GJB)".Based on the knowledge of Software Engineering and the theory of Object-Oriented programming, the software of design and calculation of ring-stiffened cylindrical shell is developed by using Visual Basic. It will afford more accurate calculation results and less time-consuming.In the end of this thesis, basis on the structure dimension of a specifically submarine, some solutions for strengthening structure are discussed, such as increasing the thickness of shell, reducing the spacing of frames, increasing the bending inertial moments of frame and setting the intermediate stiffer, when the extreme diving depth becomes 450m or 600m. Comparing these structure weights, the excellent solution is the lightest structure.