Optimum design of multiple intersecting spheres deep-submerged pressure hull

Liang, Cho–Chung; Shiah, Sheau-Wen; Jen, Chan-Yung; Chen, Hung−Wen

doi:10.1016/s0029-8018(03)00120-3

Cited by 37 publications

(10 citation statements)

References 6 publications

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“…This historic data was very crucial in understanding the basic design paradigms which holds good till in the modern day design of manned submersible. Chen [3] investigates the optimum design of a MIS deep submerged pressure hull subjected to hydrostatic pressure. In this study, the thickness of the shell, the width of the rib-ring, the inner radius of the rib-ring and the angle of intersection of the spherical shell are selected as design variables, and structural failure and human requirements are considered to minimize the buoyancy factor.…”

Section: Literature Reviewmentioning

confidence: 99%

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Numerical study of a twin sphere pressure hull and outer fairing for manned submersible

Singh

Idichandy

2015

2015 IEEE Underwater Technology (UT)

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Manned submersibles are used for surveying and undenvater exploration missions. In this paper, an effort is made to do a preliminary design of a twin sphere hull manned submersible which can accommodate three crew members to operate at ocean depth of 1000 metre. The safety of the structure against elastic yielding is studied using ANSYS APDL. . The outerfairing of the hull is studied using ANSYS CFX to estimate drag forces induced on structure for various operating speeds to estimate effective horsepower (ERP) requirement for the vehicle.

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Section: Literature Reviewmentioning

confidence: 99%

“…Further to validate the accuracy of our CFD approach to be applied over outer fairing of the DSV, a similar case of a flow around an AUV is validated [3] .ANSYS CFX is used as a solver for the CFD study.…”

Section: A Cfd Validation Of Experimental a Uv Modelmentioning

confidence: 99%

Numerical study of a twin sphere pressure hull and outer fairing for manned submersible

Singh

Idichandy

2015

2015 IEEE Underwater Technology (UT)

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“…The fiber type, orientation angle, and volume fraction in each lamina were considered as the design variables. Also, Liang et al [28] optimized a multiple intersecting spheres pressure hull for minimizing the buoyancy factor. Kim et al [29] maximized the strength and the failure index of Tsai-Hill criterion for a composite wing.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Sandwich Composite Deep Submarine Pressure Hull Considering Failure Criteria

Helal

Huang

Wang

et al. 2019

JMSE

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The pressure hull is the primary element of submarine, which withstands diving pressure and provides essential capacity for electronic systems and buoyancy. This study presents a numerical analysis and design optimization of sandwich composite deep submarine pressure hull using finite element modeling technique. This study aims to minimize buoyancy factor and maximize deck area and buckling strength factors. The collapse depth is taken as a base in the pressure hull design. The pressure hull has been analyzed using two composite materials, T700/Epoxy and B(4)5505/Epoxy, to form the upper and lower faces of the sandwich composite deep submarine pressure hull. The laminated control surface is optimized for the first ply failure index (FI) considering both Tsai–Wu and maximum stress failure criteria. The results obtained emphasize an important fact that the presence of core layer in sandwich composite pressure hull is not always more efficient. The use of sandwich in the design of composite deep submarine pressure hull at extreme depths is not a safe option. Additionally, the core thickness plays a minor role in the design of composite deep submarine pressure hull. The outcome of an optimization at extreme depths illustrates that the upper and lower faces become thicker and the core thickness becomes thinner. However, at shallow-to-moderate depths, it is recommended to use sandwich composite with a thick core to resist the shell buckling of composite submarine pressure hull.

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“…Nevertheless, spherical pressure hulls are the most efficient and popular type for the deep-sea pressure hull structures [33][34][35], as the spherical hull has the lowest buoyancy factor (weight-to-buoyancy ratio) [36,37]. Liang and Shieh [38] reported the results of a numerical study on the optimal design of a multi-segment spherical hull, which contained details regarding the sensitivity analysis of the design variables, including the thickness and the inner radius of the rib-ring. Furthermore, Xu bai et al [39] analyzed the capacity of the ring-stiffened cylindrical shell via the experimental method.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Dynamic Buckling of Spherical Shell Structures Due to Subsea Collisions

Liu

Kaewunruen²,

Zhou

et al. 2018

Applied Sciences

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This paper is the first to present the dynamic buckling behavior of spherical shell structures colliding with an obstacle block under the sea. The effect of deep water has been considered as a uniform external pressure by simplifying the effect of fluid–structure interaction. The calibrated numerical simulations were carried out via the explicit finite element package LS-DYNA using different parameters, including thickness, elastic modulus, external pressure, added mass, and velocity. The closed-form analytical formula of the static buckling criteria, including point load and external pressure, has been firstly established and verified. In addition, unprecedented parametric analyses of collision show that the dynamic buckling force (peak force), mean force, and dynamic force redistribution (skewness) during collisions are proportional to the velocity, thickness, elastic modulus, and added mass of the spherical shell structure. These linear relationships are independent of other parameters. Furthermore, it can be found that the max force during the collision is about 2.1 times that of the static buckling force calculated from the analytical formula. These novel insights can help structural engineers and designers determine whether buckling will happen in the application of submarines, subsea exploration, underwater domes, etc.

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Optimum design of multiple intersecting spheres deep-submerged pressure hull

Cited by 37 publications

References 6 publications

Numerical study of a twin sphere pressure hull and outer fairing for manned submersible

Numerical study of a twin sphere pressure hull and outer fairing for manned submersible

Numerical Analysis of Sandwich Composite Deep Submarine Pressure Hull Considering Failure Criteria

Investigation of the Dynamic Buckling of Spherical Shell Structures Due to Subsea Collisions

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