• Title/Summary/Keyword: Pressure hull

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Empirical Initial Scantling Equations on Optimal Structural Design of Submarine Pressure Hull

  • Oh, Dohan;Koo, Bonguk
    • Journal of Advanced Research in Ocean Engineering
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    • v.4 no.1
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    • pp.7-15
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    • 2018
  • The submarine is an underwater weapon system which covertly attacks the enemy. Pressure hull of a submarine is a main system which has to have a capacity which can improve the survivability (e.g., protection of crews) from the high pressure and air pollution by a leakage of water, a fire caused by outside shock, explosion, and/or operational errors. In addition, pressure hull should keep the functional performance under the harsh environment. In this study, optimal design of submarine pressure hull is dealt with 7 case studies done by analytic method and then each result's adequacy is verified by numerical method such as Finite Element Analysis (FEA). For the structural analysis by FEM, material non-linearity and geometric non-linearity are considered. After FEA, the results by analytic method and numerical method are compared. Weight optimized pressure hull initial scantling methods are suggested such as a ratio with shell thickness, flange width, web height and/or relations with radius, yield strength and design pressure (DP). The suggested initial scantling formulae can reduce the pressure hull weight from 6% and 19%.

A Study on Structural Design of Pressure Hull of Submerible (잠수정 내압선체의 구조설계에 관한 연구)

  • Gang, Byeong-Yun;Wi, Jae-Yong
    • 한국기계연구소 소보
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    • s.16
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    • pp.95-109
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    • 1986
  • The pressure hull of submersible is a unique structure which requires sophisti¬cated technology in its design and fabrication aspects. In this contribution an attempt has been made to review and analysis the pressure hull design such the most important subject as various geometrical shape, materials, and strength of pressure hull. Comparative study to theoritical analysis through the experimental measure¬ments are also carried out.

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Optimal Design of Submarine Pressure Hull Structures Using Genetic Algorithm (유전 알고리즘을 적용한 잠수함 압력선체 최적 구조설계)

  • Cho, Yoon Sik;Paik, Jeom Kee
    • Journal of the Society of Naval Architects of Korea
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    • v.54 no.5
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    • pp.378-386
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    • 2017
  • In this paper, a method is presented for the optimal design of submarine pressure hull structures by taking advantage of genetic algorithm techniques. The objective functions and design constraints in the process of structural optimization are based on the ultimate limit states of hull structures. One of the benefits associated with the utilization of genetic algorithm is that the optimization process can be completed within short generations of design variables for the pressure hull structure model. Applied examples confirm that the proposed method is useful for the optimal design of submarine pressure hull structures. Details of the design procedure with applied examples are documented. The conclusions and insights obtained from the study are summarized.

Structural Design of Small Submarine Pressure Hull (소형 잠수함 압력선체의 구조설계)

  • Kim, Heung-Youl;Shin, Yong-Ku;Kim, Soo-Young;Shin, Sung-Chul;Chung, Bo-Young;Jo, Jung-Hwa;Kim, Hyun-Soo
    • Journal of the Society of Naval Architects of Korea
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    • v.49 no.2
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    • pp.116-123
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    • 2012
  • This study aims to analyze the strength of pressure hull of a small submarine. The pressure hull of a submarine has to withstand very large differential pressure between hydrostatic pressure in submarine operating depth and atmospheric pressure in inner space of a submarine. To do that, the pressure hull is generally ring-stiffened cylindrical shell under external pressure. In this situation, there are some foreseeable failure modes of the pressure hull such as shell yielding, axisymmetric shell buckling, asymmetric shell buckling, overall buckling and buckling of end closure. We calculated collapse pressures of these failure modes with approximation and empirical formulas. And, to analyze critical buckling pressure, we performed eigenvalue analysis with finite element method tools.

Collaborative optimization for ring-stiffened composite pressure hull of underwater vehicle based on lamination parameters

  • Li, Bin;Pang, Yong-jie;Cheng, Yan-xue;Zhu, Xiao-meng
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.9 no.4
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    • pp.373-381
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    • 2017
  • A Collaborative Optimization (CO) methodology for ring-stiffened composite material pressure hull of underwater vehicle is proposed. Structural stability and material strength are both examined. Lamination parameters of laminated plates are introduced to improve the optimization efficiency. Approximation models are established based on the Ellipsoidal Basis Function (EBF) neural network to replace the finite element analysis in layout optimizers. On the basis of a two-level optimization, the simultaneous structure material collaborative optimization for the pressure vessel is implemented. The optimal configuration of metal liner and frames and composite material is obtained with the comprehensive consideration of structure and material performances. The weight of the composite pressure hull decreases by 30.3% after optimization and the validation is carried out. Collaborative optimization based on the lamination parameters can optimize the composite pressure hull effectively, as well as provide a solution for low efficiency and non-convergence of direct optimization with design variables.

Selection of PAUT probes for submarine pressure hull integrity assessment

  • Jung, Min-jae;Park, Byeong-cheol;Lim, Chae-og;Lee, Jae-chul;Shin, Sung-chul
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.12 no.1
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    • pp.578-595
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    • 2020
  • Submarine pressure hulls must withstand high hydraulic pressure and be free of defects. To improve the precision of defect detection, we herein examined different probes for optimal defect assessment by applying the Phased Array Ultrasonic Testing (PAUT) method. Two sets of probe design parameters were selected by considering pressure hull characteristics and analyzed through modeling. PAUT probes were applied, and defect assessment results were compared based on ultrasonic signals of various simulated defects in specimens designed to be the same as actual pressure hulls. The final selected design parameters for the submarine probe, which were designed to minimize the grating lobe of wave interference effect and improve the ultrasonic resolution of pressure hull welds, were identified through the experiment. The improvement in the probe's ability to detect defects in a pressure hull was verified. Furthermore, the accuracy of defect length measurement was improved, enhancing the applicability of the technique.

A Study on the Distortion Control for the Penetration Weldments of Pressure Hull (압력 선체 관통구 용접부의 변형 제어에 관한 연구)

  • Kim Ha Geun;Lee Hui Tae
    • Proceedings of the KWS Conference
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    • v.43
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    • pp.254-256
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    • 2004
  • The purpose of this study is to establish the control method of angular distortion at the weldment of the pressure hull penetration. In order to do it, comprehensive experiment and FEA were performed to evaluate the distortion behavior for the weldment of HY-100. Based on the results, a proper deposit sequence for the both sides X groove penetration weldment was established. In addition, a proper welding sequence was proposed by evaluation of bending restraint intensity with size and position of pressure hull penetration.

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Structural Analysis for Spherical Pressure Hull of Deep Manned Submersible (심해 유인 잠수정 구형 내압 선체의 구조 해석)

  • Lee, Hanmin;Park, Seong-Whan;Lee, Jai-Kyung
    • Korean Journal of Computational Design and Engineering
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    • v.20 no.4
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    • pp.412-419
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    • 2015
  • This paper presents the results of the structural analysis and the optimization of a 6,500 m manned submersible. Nonlinear structural analysis for imperfect spheres with the maximum allowable out-of-roundness(OOR) was performed to calculate the thickness of the pressure hull. Dimensions of viewports were determined according to ASME PVHO standard. The design optimization of the spherical hull with openings was divided into two steps - the optimization of the detailed shape of the viewport reinforcements and the optimization of the viewport location in the spherical pressure hull.

Optimization of compartments arrangement of submarine pressure hull with knowledge based system

  • Chung, Bo-Young;Kim, Soo-Young;Shin, Sung-Chul;Koo, Youn-Hoe;Kraus, Andreas
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.3 no.4
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    • pp.254-262
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    • 2011
  • This study aims to optimize an arrangement of ship compartments with knowledge-based systems. Though great attention has been shown to the optimization of hull forms in recent years, the study on arrangement design optimization has received relatively little attention. A ship is both an engineering system and a kind of assembly of many spaces. This means that, to design an arrangement of ship compartments, it is necessary to treat not only geometric data but also knowledge on topological relations between spaces and components of a ship. In this regard, we select a suitable knowledge representation scheme for describing ship compartments and their relations, and then develop a knowledge-based system using expert system shell. This new approach is applied to create design variations for optimization on an arrangement of a pressure hull of a submerged vehicle. Finally, we explicate how our approach improves the design process.

Optimal Design of Deep-Sea Pressure Hulls using CAE tools (CAE 기법을 활용한 심해 내압구조물의 최적설계에 관한 연구)

  • Jeong, Han Koo;Henry, Panganiban
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.25 no.6
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    • pp.477-485
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    • 2012
  • Geometric configurations such as hull shape, wall thickness, stiffener layout, and type of construction materials are the key factors influencing the structural performance of pressure hulls. Traditional theoretical approach provides quick and acceptable solutions for the design of pressure hulls within specific geometric configuration and material. In this paper, alternative approaches that can be used to obtain optimal geometric shape, wall thickness, construction material configuration and stiffener layout of a pressure hull are presented. CAE(Computer Aided Engineering) based design optimization tools are utilized in order to obtain the required structural responses and optimal design parameters. Optimal elliptical meridional profile is determined for a cylindrical pressure hull design using metamodel-based optimization technique implemented in a fully-integrated parametric modeler-CAE platform in ANSYS. While the optimal composite laminate layup and the design of ring stiffener for a thin-walled pressure hull are obtained using gradient-based optimization method in OptiStruct. It is noted that the proposed alternative approaches are potentially effective for pressure hull design.