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Journal articles on the topic 'Modelo de Hull'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

SILVA, MÔNIA APARECIDA DA, WAGNER DE LARA MACHADO, LUCIANE MARIA PILOTTO, et al. "Construção e estudo de evidências de validade da Escala de Avaliação Docente." Revista Brasileira de Educação 22, no. 70 (2017): 690–707. http://dx.doi.org/10.1590/s1413-24782017227035.

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RESUMO Este estudo objetivou apresentar a construção da Escala de Avaliação Docente (EADoc) e suas evidências de validade. A escala foi desenvolvida com base em uma revisão de literatura e de entrevistas com estudantes de graduação. A EADoc foi avaliada por dez juízes quanto a evidências de validade de conteúdo, com subsequente análise de evidências de validade de construto e fidedignidade. A matriz de correlação tetracórica foi submetida a análises fatoriais exploratórias, e o método Hull foi usado para a decisão do número de dimensões a serem retidas. Foram conduzidas análises de teoria de r

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2

Cassettari, Ailton, and Jose Raymundo Novaes Chiappin. "Um Modelo Unificado para a Previsão da Estrutura a Termo de Taxa de Juros." Brazilian Review of Finance 16, no. 2 (2018): 337. http://dx.doi.org/10.12660/rbfin.v16n2.2018.60169.

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The focus of the paper is to present a new methodology for forecasting the Term Structure of Interest Rates (ETTJ). The objective is to answer the question: given the ETTJ curve at any given time, what is the ETTJ at a future date? Thus, we seek to construct an analytical expression for the prediction of an entire curve and not only for a given future price of any asset. This objective requires a predominantly analytical and theoretical approach rather than empirical or econometric. The characteristic of this approach is the development of a "hybrid" model, describing the evolution and dynamic

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3

Castanheira de Souza, Júlio Cesar, José Geraldo Pereira Barbosa, Marco Aurélio Carino Bouzada, Antônio Augusto Gonçalves, and Elaine Tavares. "Melhores práticas em inovação: uma pesquisa em empresas do setor de TI." Revista de Administração da UFSM 8, no. 4 (2015): 685. http://dx.doi.org/10.5902/1983465910798.

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O objetivo desta pesquisa foi avaliar até que ponto a adoção, em maior ou menor grau, de práticas de gestão de inovação preconizadas pelo modelo de gestão de inovação de Hull e Tidd (2003) explicaria, juntamente com o contexto, o desempenho, tanto em desenvolvimento de inovações em serviços quanto em prestação de serviços, de 36 empresas de serviços de Tecnologia da Informação (TI) do estado do Rio de Janeiro. A pesquisa identificou que o componente do modelo que discriminou mais indicadores de desempenho em desenvolvimento de inovações em serviços foi o contexto (ambiente) em que as empresas

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Tagliafierro, Bonaventura, Simone Mancini, Pablo Ropero-Giralda, José M. Domínguez, Alejandro J. C. Crespo, and Giacomo Viccione. "Performance Assessment of a Planing Hull Using the Smoothed Particle Hydrodynamics Method." Journal of Marine Science and Engineering 9, no. 3 (2021): 244. http://dx.doi.org/10.3390/jmse9030244.

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Computational Fluid Dynamics simulations of planing hulls are generally considered less reliable than simulations of displacement hulls. This is due to the flow complexity around planing hulls, especially in the bow region, where the sprays are formed. The recent and constant increasing of computational capabilities allows simulating planing hull features, with more accurate turbulence models and advanced meshing procedures. However, mesh-based approaches based on the finite volume methods have shown to be limited in capturing all the phenomena around a planing hull. As such, the focus of this

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5

Hsu, Ching Yu, Cho Chung Liang, Tso Liang Teng, and Chia Wei Chang. "The Effect of Roundness on the Buckling Strength for the Submerged Pressure Hull." Applied Mechanics and Materials 644-650 (September 2014): 5133–37. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.5133.

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The pressure hull is the most important part of resisting pressure structures of the structural systems. The submerged pressure hull is subjected to very high hydrostatic pressure or underwater explosion load, which creates large compressive stress resultants. Due to this the pressure hull is susceptible to buckling. Buckling phenomena analysis is of greater importance in the design of the submerged pressure hulls. For the pressure hulls with local out-of-roundness, the operating depth will be greatly influenced and thus decreasing capability to resist pressure loading. Thus, this work employs

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6

Baptista, Makilim Nunes, Eliane Mary de Oliveira Falcone, Monique Placido Viegas, et al. "Estrutura Interna da Escala Cognitiva de Ansiedade (ECOGA)." Psico-USF 25, no. 4 (2020): 751–62. http://dx.doi.org/10.1590/1413/82712020250413.

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Resumo Este estudo objetivou investigar evidências de validade de estrutura interna para a Escala Cognitiva de Ansiedade (ECOGA) por análise fatorial exploratória (AFE). A amostra foi formada por 874 participantes, sendo 656 da população geral, 179 de instituições de saúde e 39 de consultórios particulares com hipótese diagnóstica de transtornos de ansiedade. A maioria da amostra foi masculina (55%), solteiros (61,1%) com ensino superior incompleto (46%). A análise paralela da ECOGA, contendo inicialmente 73 itens, demonstrou a existência de até quatro fatores, a MAP com três e a Hull com um.

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7

Centeno, R., K. S. Varyani, and C. Guedes Soares. "Experimental Study on the Influence of Hull Spacing on Hard-Chine Catamaran Motions." Journal of Ship Research 45, no. 03 (2001): 216–27. http://dx.doi.org/10.5957/jsr.2001.45.3.216.

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An experimental program was performed with hard-chine catamaran models in regular waves. The distance between the demi-hulls of the models was changed to assess its effects on the wave-induced motions. The results allowed the study of some aspects related to catamaran motions, like the interference between the hulls and resonance frequencies. The experimental results are compared with calculations performed with a recently developed code based on a two-dimensional potential flow theory in which viscous forces are included through a cross-flow drag approach. The effect of the hull distance in t

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8

Navarro-Chávez, César Lenin, Juan González García, and Odette V. Delfín-Ortega. "La eficiencia de los puertos en el sureste de Asia, 2005-2015: una medición no paramétrica a través del modelo Free Disposal Hull (FDH)." México y la Cuenca del Pacífico 9, no. 26 (2020): 41–67. http://dx.doi.org/10.32870/mycp.v9i26.660.

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9

Sun, Shuzheng, Wenlei Du, and Hui Li. "Study on Green Water of Tumblehome Hull Using Dam-Break Flow and Ranse Models." Polish Maritime Research 24, s2 (2017): 172–80. http://dx.doi.org/10.1515/pomr-2017-0080.

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Abstract The tumblehome hull adopts some novelty designs such as low-tumblehome freeboard and wave-piercing bow. The new form design makes the ship have many special hydrodynamic performances. Especially the green water of tumblehome hull is different from that of hulls with flare free board. Green water is a strong nonlinear phenomenon of ship-wave interaction, the variation of free surface of liquid is complicated, and there are still some difficulties to solve green water problems well with numerical simulation method. In this paper firstly the motion responses of the tumblehome hull was ca

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10

West, Harry, and Michael Gallo. "Design Through Manufacture: A Computer-Aided Design Advisor for the Manufacture of Submarine Hulls." Journal of Ship Production 6, no. 04 (1990): 247–54. http://dx.doi.org/10.5957/jsp.1990.6.4.247.

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A computer graphics based advisory system has been developed to aid in the design and manufacture of submarine hulls. The design and manufacture advisor incorporates models of the materials (steel) and processes (bump forming, roll bending, welding, and fixturing) used for the manufacture of the hulls, and allows the user to explore the effect of different material qualities (described in terms of variances of thickness and yield strength), and different manufacturing parameters (punch penetration, punch spacing, and number of fixtures, for example) on the resulting quality (circularity) of th

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11

Xiao, Lin Jing, and Li Fu Zhuang. "Influence of Convex Hull Density on Friction Contact of Bionic Surface." Advanced Materials Research 308-310 (August 2011): 483–89. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.483.

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In order to study the influence of convex hull density on friction contact of bionic surface, we observed the 3-D structure of locust, tree frog and grasshopper with the 3-D microscope system, the experiments show that there convex hulls(diameters are 4um-6um)on the unsmoothed surface of feet pads; based on that structure the paper designs four kinds of unsmoothed bionic surfaces with different densities(center distances are 2R, 3R, 4R and 5R), the four contact models built by ANSYS are solved at the same loads and constraint condition, results indicate that the elastic deformation on top surf

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12

Elhadef, Khaoula, Sarra Akermi, Hajer Ben Hlima, et al. "Tunisian Pistachio Hull Extracts: Phytochemical Content, Antioxidant Activity, and Foodborne Pathogen Inhibition." Journal of Food Quality 2021 (May 5, 2021): 1–18. http://dx.doi.org/10.1155/2021/9953545.

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The present study aimed to discriminate pistachio (Pistacia vera L.) hulls belonging to three different Tunisian geographical origins and extracted separately by hexane, acetone, acetonitrile, and water in terms of phytochemicals and antioxidant and antibacterial activities using multivariate analysis. Significant differences ( P < 0.05 ) in the phytochemical content, antioxidant, and antifoodborne bacterial activities were detected among the pistachio hulls populations. Pearson correlation, principal component analysis (PCA), hierarchical cluster analysis (HCA), and heat map were used to d

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13

Suwasono, Bagiyo, Mochammad Rizky Darmawan, and Intan Baroroh. "Material Effectiveness Model for the Construction of Aluminum Hull." Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan 18, no. 1 (2020): 18–27. http://dx.doi.org/10.14710/kapal.v18i1.29974.

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Construction of a hull generally requires several plates and profile material. Early indications for shipbuilding indicate that in manner, the linear function approach for installed material was 75% to 90%, and waste material was 10% to 25%. This study is conducting an assessment of the area of installed material and waste material on small vessels made of aluminum with variations in ship length and the method of approach trend lines both linear and nonlinear. Secondary data retrieval in the form of an aluminum cutting plan for plate material and profile from the AutoCAD application, which is

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14

Shen, Hai Long, Mo Du, and Yu Min Su. "Study of Microminiature Autonomous Underwater Vehicle Hull Form Based on CFD Technique." Advanced Materials Research 512-515 (May 2012): 2682–85. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2682.

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Based on CFD technique，this paper discusses the applicability of different turbulence models and mesh partition method which are used to predict the hydrodynamic performance of AUV. Firstly, the hydrodynamic performance prediction method was gotten and was validated, and three different shapes autonomous underwater vehicles were designed. The hydrodynamic performances of the three autonomous underwater vehicles were predicted. Then, the advantage and disadvantage of the four autonomous underwater vehicles were obtained by comparing the resistance and pressure distribution. Based on these, two

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15

Ramli, Azizul Azhar, Junzo Watada, and Witold Pedrycz. "An Efficient Solution of Real-Time Fuzzy Regression Analysis to Information Granules Problem." Journal of Advanced Computational Intelligence and Intelligent Informatics 16, no. 2 (2012): 199–209. http://dx.doi.org/10.20965/jaciii.2012.p0199.

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Regression models are well known and widely used as one of the important categories of models in system modeling. In this paper, we extend the concept of fuzzy regression in order to handle real-time implementation of data analysis of information granules. An ultimate objective of this study is to develop a hybrid of a genetically-guided clustering algorithm called genetic algorithm-based Fuzzy C-Means (GAFCM) and a convex hull-based regression approach being regarded as a potential solution to the formation of information granules. It is shown that a setting of Granular Computing helps us red

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16

Balaji, V., S. Ravi, and P. Naveen Chandran. "FEM method structural analysis of pressure hull by using hyper mesh." International Journal of Engineering & Technology 7, no. 1.5 (2017): 258. http://dx.doi.org/10.14419/ijet.v7i1.5.9158.

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Pressure hulls are the central load bearing structures of naval submarines, and AUVs ( autonomous underwater vehicles).. A pressure hull is a structure that is designed to resist the compressive forces related with hydrostatic pressure. The most coherent geometries for resisting these compressive forces are annular cross-sections, and thus, pressure hulls are typically composed of a combination of cones and ring-stiffened cylinders, with torispherical domes or spherical at either end. These shells are subject to an external pressure of 65 Bar due to the difference between outside and inside pr

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17

Cucinotta, Filippo, Dario Mancini, Felice Sfravara, and Francesco Tamburrino. "The Effect of Longitudinal Rails on an Air Cavity Stepped Planing Hull." Journal of Marine Science and Engineering 9, no. 5 (2021): 470. http://dx.doi.org/10.3390/jmse9050470.

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The use of ventilated hulls is rapidly expanding. However, experimental and numerical analyses are still very limited, particularly for high-speed vessels and for stepped planing hulls. In this work, the authors present a comparison between towing tank tests and CFD analyses carried out on a single-stepped planing hull provided with forced ventilation on the bottom. The boat has identical geometries to those presented by the authors in other works, but with the addition of longitudinal rails. In particular, the study addresses the effect of the rails on the bottom of the hull, in terms of drag

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18

Fragassa, Cristiano. "Engineering Design Driven by Models and Measures: The Case of a Rigid Inflatable Boat." Journal of Marine Science and Engineering 7, no. 1 (2019): 6. http://dx.doi.org/10.3390/jmse7010006.

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Rigid-hulled inflatable boats are extremely practical and popular nowadays, offering an effective conciliation among usability and costs. Their stable and seaworthy behavior is guaranteed by performing hydroplaning hulls coupled with unsinkable inflated tubes. At the same time, their design is often based on tradition and preconceptions. In this article, both numerical methods and experimental mechanics techniques are proposed as an essential way for supporting the designers in decisive tasks. Three different situations are detailed where a numerical or an experimental approach shows its benef

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Grover, Dhruv, John Tower, and Simon Tavaré. "O fly, where art thou?" Journal of The Royal Society Interface 5, no. 27 (2008): 1181–91. http://dx.doi.org/10.1098/rsif.2007.1333.

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In this paper, the design of a real-time image acquisition system for tracking the movement of Drosophila in three-dimensional space is presented. The system uses three calibrated and synchronized cameras to detect multiple flies and integrates the detected fly silhouettes to construct the three-dimensional visual hull models of each fly. We used an extended Kalman filter to estimate the state of each fly, given past positions from the reconstructed fly visual hulls. The results show that our approach constructs the three-dimensional visual hull of each fly from the detected image silhouettes

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20

Lewandowski, Edward M. "Prediction of the Dynamic Roll Stability of Hard-Chine Planing Craft." Journal of Ship Research 40, no. 02 (1996): 144–48. http://dx.doi.org/10.5957/jsr.1996.40.2.144.

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A method is presented to predict the roll restoring moments acting on hard-chine craft operating at planing speeds, which can be used to evaluate the dynamic roll stability of these vessels. Expression are developed for the static and dynamic contributions to the restoring moment. Tests were conducted to measure the restoring moment on five different planing hull models. The predictions for these hulls compare well with the experimental results.

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Nguyen, Nguyet, Dung Nguyen, and Thomas P. Wakefield. "Using the Hidden Markov Model to Improve the Hull-White Model for Short Rate." International Journal of Trade, Economics and Finance 9, no. 2 (2018): 54–59. http://dx.doi.org/10.18178/ijtef.2018.9.2.588.

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22

Wang, Jiandong, Jiayuan Zhuang, Yumin Su, and Xiaosheng Bi. "Inhibition and Hydrodynamic Analysis of Twin Side-Hulls on the Porpoising Instability of Planing Boats." Journal of Marine Science and Engineering 9, no. 1 (2021): 50. http://dx.doi.org/10.3390/jmse9010050.

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A comparative analysis of the hydrodynamic performance of a planing craft in the monomer-form state (MFS) and trimaran-form state (TFS) was performed, and the inhibition mechanism of twin side-hulls on porpoising instability was evaluated based on the numerical method. A series of drag tests were conducted on the monomer-form models with different longitudinal locations of the center of gravity (Lcg); the occurrence of porpoising and the influence of Lcg on porpoising by the model was discussed. Then, based on the Reynolds-averaged Navier–Stokes (RANS) solver and overset grid technology, numer

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23

van den Dries, Lou, and Adam H. Lewenberg. "T-convexity and tame extensions." Journal of Symbolic Logic 60, no. 1 (1995): 74–102. http://dx.doi.org/10.2307/2275510.

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AbstractLet T be a complete o-minimal extension of the theory of real closed fields. We characterize the convex hulls of elementary substructures of models of T and show that the residue field of such a convex hull has a natural expansion to a model of T. We give a quantifier elimination relative to T for the theory of pairs (ℛ, V) where ℛ ⊨ T and V ≠ ℛ is the convex hull of an elementary substructure of ℛ. We deduce that the theory of such pairs is complete and weakly o-minimal. We also give a quantifier elimination relative to T for the theory of pairs with ℛ a model of T and a proper elemen

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24

Alchakov, Vasiliy V., Vadim A. Kramar, and Anna V. Rodkina. "Computational model of hull steel potential values in sea water." Russian Journal of Water Transport, no. 64 (August 29, 2020): 11–26. http://dx.doi.org/10.37890/jwt.vi64.93.

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The article provides an analysis of existing neural network models. The features of constructing a neural network using several parameters that affect the output value are described. The advantages of using neural networks and computing systems based on them are revealed. The task was solved using the Python programming language. The computing model of the potential values of steel with an oxide film and the potential of steel without an oxide film has been developed for various salinity of sea water and different types of hull steels used for hulls of sea vessels and underwater structures of

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25

Bhattacharya, Kaushik, and Georg Dolzmann. "Relaxation of some multi-well problems." Proceedings of the Royal Society of Edinburgh: Section A Mathematics 131, no. 2 (2001): 279–320. http://dx.doi.org/10.1017/s0308210500000883.

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Mathematical models of phase transitions in solids lead to the variational problem, minimize ∫Ω W (Du) dx, where W has a multi-well structure, i.e. W = 0 on a multi-well set K and W > 0 otherwise. We study this problem in two dimensions in the case of equal determinant, i.e. for K = SO(2)U1 ∪ … ∪SO(2)Uk or K = O(2)U1 ∪ … ∪ O(2)Uk for U1, … , Uk ∈ M2×2 with det Ui = δ in three dimensions when the matrices Ui are essentially two-dimensional and also for K = SO(3)Û1 ∪ … ∪ SO(3)Ûk for U1, … , Uk ∈ M3×3 with , which arises in the study of thin films. Here, Ûi denotes the (3×2) matrix formed with

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26

Elsayed, Fathallah, Hui Qi, Li Li Tong, and Mahmoud Helal. "Optimal Structure Design of Elliptical Deep-Submersible Pressure Hull." Materials Science Forum 813 (March 2015): 85–93. http://dx.doi.org/10.4028/www.scientific.net/msf.813.85.

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Geometric configurations such as hull shape, shell thickness, stiffener layout, and type of materials are the key factors influencing the structural performance of pressure hulls. The aim of this study is to maximize the structural efficiency of elliptical deep-submerged pressure hull under hydrostatic pressure. Minimize the buoyancy factor of a submarine pressure hull under hydrostatic pressure was proposed as an objective function for both composite and steel models. The thickness and the orientation angle of each layer, the radii of the ellipse and the operating depth are taken as design va

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27

Venegas Martínez, Francisco, and Andrés Finfia Aizenstat. "Opciones reales, valuación financiera de proyectos y estrategias de negocios. Aplicaciones al caso mexicano." El Trimestre Económico 73, no. 290 (2017): 363. http://dx.doi.org/10.20430/ete.v73i290.548.

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En este trabajo la metodología de opciones reales se presenta como un instrumento indispensable para que los consejos de administración de las empresas tomen decisiones respecto a proyectos de inversión o estrategias de negocios cuando existe la flexibilidad (opcionalidad) de tomar en el futuro nuevas decisiones relacionadas con extender, contraer, posponer, enmendar o abandonar un proyecto o estrategia. Al respecto, el presente trabajo realiza una revisión de las diferentes fórmulas analíticas que aparecen en la bibliografía para valuar la opcionalidad de estrategias en el supuesto de que el

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28

Artero, Juan P. "Online Video Business Models: YouTube vs. Hulu." Palabra Clave - Revista de Comunicación 13, no. 1 (2010): 111–23. http://dx.doi.org/10.5294/pacla.2010.13.1.7.

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Grigson, Christopher. "Screws Working in Behind and Prediction of the Performance of Full Ships." Journal of Ship Research 34, no. 04 (1990): 262–82. http://dx.doi.org/10.5957/jsr.1990.34.4.262.

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Constant speed propulsion tests of full models are investigated. The propulsion factors are found to vary with propeller speed, n. When the tests extend to idling conditions, the nominal wake fraction and the complete propeller-hull behind characteristics ϕ(u/nd) are determined. Fifteen designs of hull and screw are investigated. In some, the coupling between the velocity field of the hull and that of the screw is found to be strong. The behind characteristics depend both on the design of the screw and on the design of the hull. The same design of screw may efficiently power hulls of quite dif

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30

Friedman, Sy D. "Jensen's Σ* theory and the combinatorial content of V = L". Journal of Symbolic Logic 59, № 3 (1994): 1096–104. http://dx.doi.org/10.2307/2275930.

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An awkward feature of the standard fine structure theory of the Jα's (see Jensen [72]) is that special parameters are required to make good sense of the notion of “Σn Skolem hull”, parameters which may not be preserved in condensation arguments.The purpose of this article is to indicate how a reformulation of Jensen's Σ* theory (developed for the study of core models) can be used to provide a more satisfactory treatment of uniformization, hulls, and Skolem functions for the Jα's. Then we use this approach to fine structure to formulate a principle intended to capture the combinatorial content

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Morabito, M. G. "Empirical Equations for Planing Hull Bottom Pressures." Journal of Ship Research 58, no. 04 (2014): 185–200. http://dx.doi.org/10.5957/jsr.2014.58.4.185.

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Recently there has been increasing interest in the fluid-structure interaction problem of planning hull bottom structure during slamming events. Significant work has been done in estimating the bottom pressures that occur during a slam and incorporating this into structural models of planing craft. In this article, empirical equations for the pressure distribution on prismatic planing hulls are developed, including both hydrostatic and hydrodynamic effects, deadrise variation, trim, and wetted length. The empirical method is based on relevant experimental measurements of planing hull bottom pr

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Broadwater, John D., Sean M. Kery, Michael Eaton, et al. "A Forensic Investigation of the Sinking of USS Monitor Using Modern Naval Architecture Tools and Technologies." Marine Technology Society Journal 46, no. 6 (2012): 16–37. http://dx.doi.org/10.4031/mtsj.46.6.5.

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AbstractThe Union ironclad warship USS Monitor foundered in heavy seas off Cape Hatteras, North Carolina, on December 31, 1862. This paper focuses on the development and validation of numerical models of a ship foundering using USS Monitor as a test subject. It begins with a brief account of the vessel’s history and the circumstances leading up to the sinking, then presents the best estimate available for the vessel’s loading condition and hydrostatics. The ingress of water into the ship at a number of locations was described by the survivors, some of whom speculated that the upper and lower h

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Chugunov, Alexander, Dmitry Shishov, Aleksandr Nikonorov, and Vladimir Filatov. "Modeling of Heavy Armocement Deformation for the Conical Shape of the Heat Accumulator Body by the Methods of Computer Engineering." MATEC Web of Conferences 170 (2018): 03034. http://dx.doi.org/10.1051/matecconf/201817003034.

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The computer simulation of the structural material is required to study the stress-strain state of the structural material of the high-pressure hull (in particular, the heat accumulator body). Laboratory experiment requires significant financial expenses, which is a significant drawback of this type of study. Therefore, the authors considered finite element modeling of structural material by adapting modern software systems for calculating the considered models. A modern design solution for high-pressure hulls of heat accumulators made of non-prestressed reinforced concrete involves the usage

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Gierusz, Witold, and Anna Waszkiel. "Determination of Suction Forces and Moment on Parallel Manoeuvring Vessels for a Future Control System." Solid State Phenomena 180 (November 2011): 281–87. http://dx.doi.org/10.4028/www.scientific.net/ssp.180.281.

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Vessels moving on parallel courses on the border of two mediums interact together. Ship to ship interactions are caused by irregular pressure distribution around the hull. Higher velocity of the fluid between hulls causes formation of the decreased pressure amidships. This is the base of suction forces and moments generation. Analytical computations and computer based CFD simulations were carried out on the basis of 3DOF models of two training ships - VLCC and Passenger Car Ferry. The results of both methods are comparable. Therefore the analytical semi-empirical equations can be implemented i

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Grządziela, Andrzej, Bogdan Szturomski, and Marcin Kluczyk. "Modeling of the Minehunters Hull Strenght." Advanced Materials Research 1036 (October 2014): 189–94. http://dx.doi.org/10.4028/www.scientific.net/amr.1036.189.

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The paper presents problems of modeling the ship’s hull subjected to the load of shock wave associated with non-contact underwater explosion. The article presents equations for describing the parameters of shock wave subjected to an impulse load. The paper presents a proposal of identification of a degree of hazard the ship’s hull forced from underwater explosion. A theoretical analysis was made of influence of changes of hull structure in vicinity of hull. Modeled signals and hull structure were recognized within sensitive symptoms of three sub models: model of hull structure, model of impact

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Pranatal, Erifive, Gatot Basuki, Norita Prasetya, Maria Margareta Zau Beu, and Minto Basuki. "Reparasi dan Perhitungan Tahanan Kapal Nelayan di Daerah Nambangan Kelurahan Kedung Cowek – Surabaya." JAST : Jurnal Aplikasi Sains dan Teknologi 4, no. 1 (2020): 1. http://dx.doi.org/10.33366/jast.v4i1.1456.

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Wooden hulls have been damaged and overgrown by fouling have negative impact on the service life and also increase the resistance of ship thereby increasing fuel consumption. Therefore the ship have to repaired regularly. The problem discussed is how to repair wooden ships such as replacing plank, cleaning hull and coating; and hull analysis to determine resistance of ship. Therefore the object of this paper is to repair wooden ships and analysis of the hull. The method used is training that is followed by demonstration and also science and technology simulation that explains the form hull and

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Compton, Roger H. "Resistance of a Systematic Series of Semiplaning Transom-Stern Hulls." Marine Technology and SNAME News 23, no. 04 (1986): 345–70. http://dx.doi.org/10.5957/mt1.1986.23.4.345.

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YP 676 underway The results of a systematic series of small (5 ft) models of hulls typical of coastal patrol, training, or recreational powerboats are presented and discussed. Hull form parameters studied include length-to-beam ratio, displacement-length ratio, longitudinal position of the center of gravity and section shape (hard chine or round bilge). The effects of these parameters on the calm-water resistance and running attitude (sinkage and trim) over a range of speeds corresponding to waterline length Froude numbers from 0.10 to 0.60 were investigated in the 120-ft towing tank at the U.

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Zaraphonities, George, Gregory J. Grigoropoulos, Dimitra P. Damala, and Dimitris Mourkoyannis. "Seakeeping Analysis of two Medium-speed Twin-hull Models." Journal of Ship Production and Design 31, no. 03 (2015): 192–200. http://dx.doi.org/10.5957/jspd.2015.31.3.192.

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The use of twin-hull ships for high-speed passenger and car-passenger transportation is widespread, whereas their potential use for high-speed cargo transportation was estimated as limited. The present article discusses the seakeeping performance of two twin-hull models of an innovative medium-speed container ship design. Their hull form was the result of a thorough hydrodynamic optimization performed at the School of Naval Architecture and Marine Engineering of NTUA aiming to minimize the calm water resistance within the EU-funded project "EU-CargoXpress." The seakeeping analysis was performe

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Lee, Tao-Lin, Rohan Attele, and Keh-Wei Chen. "Maximum likelihood estimation in convex hull models." Communications in Statistics - Theory and Methods 19, no. 10 (1990): 3759–77. http://dx.doi.org/10.1080/03610929008830412.

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Han, Soonhung, Yeon-Seung Lee, and Young Bok Choi. "Hydrodynamic hull form optimization using parametric models." Journal of Marine Science and Technology 17, no. 1 (2012): 1–17. http://dx.doi.org/10.1007/s00773-011-0148-8.

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Bedi, S., W. Chernoff, and G. W. Vickers. "Computer-aided Fairing and Direct Numerically Controlled Machining of Ship Hull Hydrodynamic Testing Models." Transactions of the Canadian Society for Mechanical Engineering 12, no. 1 (1988): 43–48. http://dx.doi.org/10.1139/tcsme-1988-0007.

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A computer-aided method of defining and machining 2-metre ship hull forms for hydrodynamic testing is described. The hull shape is faired from the original table of off-sets using a minimum number of smooth three-dimensional parametric skeletal-lines along the length of the boat. A fine set of smoothly blending station-lines is therby formed. The hull shape is preformed in two halves through a lamination process and machined on a three-axis numerically controlled machining (CNC) centre. A carbide-tipped, end-milling cutter is directed along the closely spaced station-lines to rapidly form an a

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Grządziela, Andrzej. "Modeling the Effects of Underwater Detonation Wave." Key Engineering Materials 588 (October 2013): 175–83. http://dx.doi.org/10.4028/www.scientific.net/kem.588.175.

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Minehunters are subjected to specific sea loads due to waving and dynamical impacts associated with underwater explosion. Sea waving can be sufficiently exactly modeled by means of statistical methods. Much more problems arise from modeling impacts due to underwater explosion. Knowledge of a character of impulse loading which affects ship shaft line can make it possible to identify potential failures by means of on-line vibration measuring systems. The problem of influence of sea mine explosion on hull structure is complex and belongs to more difficult issues of ship dynamics. Underwater explo

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Madsen, David B., and David Rhode. "Early Holocene pinyon (Pinus monophylla) in the northeastern Great Basin." Quaternary Research 33, no. 1 (1990): 94–101. http://dx.doi.org/10.1016/0033-5894(90)90087-2.

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AbstractFine-grained excavation and analysis of a stratigraphic column from Danger Cave, northeastern Great Basin, suggests prehistoric hunter-gatherers were collecting and using singleleaf pinyon (Pinus monophylla) near the site for at least the last 7500 yr. Human use of the cave began after the retreat of Lake Bonneville from the Gilbert level, shortly before 10,000 yr B.P. In stratum 9, culturally deposited pine nut hulls appear in the sequence by about 7900 yr B.P. and are continuously present thereafter. A hull fragment in stratum 10 is directly dated to 7410 ± 120 yr B.P. These dates ar

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Blass, Andreas, and Andre Scedrov. "Small decidable sheaves." Journal of Symbolic Logic 51, no. 3 (1986): 726–31. http://dx.doi.org/10.2307/2274026.

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Fred Richman conjectured that the following principle is not constructive:(*) If A is a decidable subset of the set N of natural numbers and if, for every decidable subset B of N, either A ⊆ B or A ⊆ N − B, then, for some n ∈ N, A ⊆ {n}.A set A of natural numbers is called decidable if ∀n(n ∈ A ∨ ⌉ (n ∈ A)) holds. In recursive models, this agrees with the recursion-theoretic meaning of decidability. In other contexts, “complemented” and “detachable” are often used.Richman's conjecture was motivated by the problem of uniqueness of divisible hulls of abelian groups in constructive algebra. Richm

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Li, Zhixiong. "Robust global sliding model control for water-hull-propulsion unit interaction systems - Part 1: System boundary identification." Tehnicki vjesnik - Technical Gazette 22, no. 1 (2015): 209–15. http://dx.doi.org/10.17559/tv-20141208054126.

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Okasha, Nader M., and Dan M. Frangopol. "Efficient Method Based on Optimization and Simulation for the Probabilistic Strength Computation of the Ship Hull." Journal of Ship Research 54, no. 04 (2010): 244–56. http://dx.doi.org/10.5957/jsr.2010.54.4.244.

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The accurate computation of the strength of a ship hull is vital for ensuring its reliability. Taking into account the uncertainties in the material properties and fabrication details requires a probabilistic approach for the determination of the strength of the ship hull. This study proposes an efficient approach for the determination of the probabilistic strength of the ship hull. First, a novel deterministic method for the fast and accurate calculation of the strength of the ship hull is presented. In this method, stresses in the hull section are determined using the constitutive models of

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Wilken, Marc, Henner Eisen, Matthias Krömer, and Christian Cabos. "Mapping Hull Condition and Finite Element Models for Hull Structure Assessment of Ships in Operation." Ship Technology Research 58, no. 3 (2011): 168–81. http://dx.doi.org/10.1179/str.2011.58.3.005.

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Zou, Lu, Jiang, Sun, and Li. "Experimental and Numerical Research on the Influence of Stern Flap Mounting Angle on Double-Stepped Planing Hull Hydrodynamic Performance." Journal of Marine Science and Engineering 7, no. 10 (2019): 346. http://dx.doi.org/10.3390/jmse7100346.

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In the current hydrodynamic research relating to planing hulls, the stern flap and steps are generally considered to be two independent resistance reduction measures. Limited research has focused on the coupled effects of flaps and steps. Therefore, experimental and numerical simulation methods are carried out in this paper to explore the influence of the flap mounting angle coupled with the steps. A series of model towing tests were implemented for a double-stepped planing hull with 2°, 3° and 4.5° flap angles. The test results show that, as the mounting angle increased, the low speed resista

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Gong, Jiaye, and Yunbo Li. "The Prediction of Hull Gesture and Flow Around Ship Based on Taylor Expansion Boundary Element Method." Polish Maritime Research 26, no. 2 (2019): 198–211. http://dx.doi.org/10.2478/pomr-2019-0039.

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Abstract Based on the potential flow theory and traditional boundary element method (BEM), Taylor expansion boundary element method (TEBEM) is introduced in this paper for the prediction of the flow field around ship, as a result, hull gesture and pressure distribution on hull surface are obtained. By this method, dipole strength of every field point is expanded in Taylor expansion, so that approximately continuous hull and free surface boundary condition could be achieved. To close the new equation system, the boundary condition of tangent velocity in every control point is introduced. With t

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Shen, Hai Long, Gomri Abdelhak, Qing Tong Chen, and Yu Min Su. "The Hydrodynamic Performance Prediction of Ship Hull with Propeller." Applied Mechanics and Materials 117-119 (October 2011): 598–601. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.598.

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This paper describes the hydrodynamic performance prediction of ship hull with propeller by using CFD techniques. As an attempt in investigating the flow features around ship hull equipped with a rotating propeller, open water test, resistance test, and self-propulsion test were conducted. The paper discusses also the applicability of different turbulence models which are used to predict the hydrodynamic performance of the propeller, the hull, and the interaction hull-propeller. The hydrodynamic performance prediction method was gotten and was validated. The computational results were validate

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