The Response Analysis And Optimum Design Of Great Deep-Submerged Pressure Hulls

The static mechanical property of the spherical and multiple intersecting spherical deep-submerged pressure hulls and the influences of diversified parameters have been investigated theoretically and numerically in this paper under the guidance of my tutor. Additionally, referencing deep-submerged specification, this paper has studied the optimum design for these two types of deep-submerged pressure hulls. And it provides reference for the structural design of deep-submerged pressure hull.Considering the effect of material nonlinearity and initial deflection, the formula of nonlinear stability for spherical thick hulls with initial deflection is proposed at first. The theoretical result is found to be in agreement with the experiment result, and the correctness of this formula is also validated by the finite-element method. This formula is used to study the strength and stability of a series of spherical deep-submerged pressure hulls with f R in 0.1%~0.5% and t R in 5%~9%. Additionally, referencing deep-submerged specification, this paper made the optimum design for spherical deep-submerged pressure hulls.Multiple intersecting spheres tangent arc connective pressure hull is a new structural style of great deep-submerged pressure hull which is proposed by the author. Considering the effect of material nonlinearity and initial deflection, the strength and stability of a series of three intersecting spheres tangent arc connective pressure hulls with f R in 0.05%~0.5%, t R in 5%~9%, L R in 1.9~2.7,θin 400~650 is studied by finite-element method. Additionally, using least-squares procedure, the formulas of nonlinear strength and stability for three intersecting spheres tangent arc connective pressure hull are proposed in this paper.Finally, considering the effect of material nonlinearity and initial deflection, and referencing for the specification, this paper investigates the optimum design of the three intersecting spheres tangent arc connective pressure hulls by the optimization procedure of out penalty function method. In this study, the thickness-radius ratio, the length-radius ratio of the spherical shell, and the angle of intersection of the spherical shell are selected as design variables, and the strength, stability and boundary constraint are considered to minimize the buoyancy factor. Additionally, a sensitivity analysis is performed to study the influence of the design variables on the structural optimum design and also studies the effect of design variables on the buoyancy factor, strength factor and stability. The research production of this paper provides a reference for the structural design of deep-submerged pressure hull.