Dissertationen zum Thema „Ford (Ship)“
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Bassham, Bobby A. „An evaluation of electric motors for ship propulsion“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Jun%5FBassham.pdf.
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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, June 2003.Thesis advisor(s): Robert Ashton, Todd Weatherford. Includes bibliographical references (p. 93-96). Also available online.
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Hittel, Steven George. „An experimental analysis of the hydrodynamic characteristics of the monoform: a novel hull form“. Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/91119.
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This thesis presents the results of an experimental investigation of the hydrodynamic characteristics of the Monoform hull in calm water. The forces acting on a 1.7 meter model were measured as the model was held captive and towed in calm water. The model was tested at speeds up to three meters per second. The rudders were held straight during one part of the study and were deflected during another to test both their ability to correct for pitching moment and to create yaw moments. The draft of the model was also varied during this study and included drafts of 1.90, 2.21, and 2.42 hull diameters. All three forces and all three moments were measured. The model was tested in a 31 meter towing basin located at Virginia Polytechnic Institute and State University. The results are presented in Figure form in the thesis body and in numerical form in an appendix. Recommendations for future work and improvements to the instrumentation are presented along with conclusions at the end of the thesis.M.S.
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Sullivan, Brett M. „Determination of cost drivers for Ship Operations (1B1B) consumable (SO) operations target accounts for Amphibious Assault ships“. Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Dec/08Dec%5FSullivanB.pdf.
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Thesis (M.S. in Operations Research)--Naval Postgraduate School, December 2008.Thesis Advisor(s): Nussbaum, Daniel A. "December 2008." Description based on title screen as viewed on February 2, 2009. Includes bibliographical references (p. 77). Also available in print.
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Agarwal, Richa. „Network design and alliance formation for liner shipping“. Diss., Available online, Georgia Institute of Technology, 2007, 2007. http://etd.gatech.edu/theses/available/etd-07082007-213229/.
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Thesis (Ph. D.)--Industrial and Systems Engineering, Georgia Institute of Technology, 2008.Professor Michael D. Meyer, Committee Member ; Professor Ozlem Ergun, Committee Chair ; Professor Ellis Johnson, Committee Member ; Professor George L. Nemhauser, Committee Member ; Professor H. Venkateswaran, Committee Member.
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Luyo, Sánchez Kelly Melina, Villarroel Jennifer Isabel Grande, Quispe Nelly Beatriz Sulca, Ynga Irvings Christian Minaya und Galindo Edgard Xavier Izarra. „SHOP 360°“. Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/654830.
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SHOP 360° es una tienda virtual y aplicación para dispositivos móviles, que brindará ayuda a las familias peruanas en realizar compras domésticas para sus hogares de forma virtual, sin necesidad de salir de casa, cerca al lugar de su residencia o entorno más cercano, a la vez, brindará apoyo a las bodegas que deseen promocionar su marca por la red, con la finalidad de poder generar mayores ventas. Esta aplicación cuenta con localización instantánea, que permite visualizar los establecimientos más cercanos a nuestro domicilio, además, permite ver la variedad, stock y precios de diferentes bodegas. Los pagos se pueden realizar de distintas maneras, pueden ser transferencias interbancarias, yape, lukita, pago mediante tarjetas de débito o crédito.
Este proyecto surgió a partir de la necesidad presentada por el usuario finalista y el bodeguero, debido a la pandemia COVID 19 que estamos viviendo en el presente año 2020, en muchos casos, la población dejó de asistir a las bodegas, supermercados, mercados, tiendas por miedo al contagio de otra persona, es por eso, que se empezó a dar más uso de la tecnología, como las compras virtuales y entregas por delivery. Las bodegas asociadas a SHOP 360° tienen claro el servicio que brinda al usuario respetando los protocolos de seguridad.
Actualmente no existe competencia directa que se enfoque a empresarios Mypes. Por ello nace Shop 360° para brindar soporte al pequeño emprendedor. Asimismo, contamos con un equipo competitivo y motivado para poder llevar a cabo este proyecto, con la atención personalizada al cliente.SHOP 360 ° is a virtual store and application for mobile devices that will help Peruvian families in making domestic purchases for their homes in a virtual way, without the need to leave home, close to the place of their residence or closest environment. At the same time, it will provide support to convenience stores that wish to promote their brand online in order to generate higher sales. This application has instant location, which allows you to view the establishments closest to you. In addition, it allows you to see the variety, stock and prices of different convenience stores. Payments can be made in different ways. For example: bank transfers, yape, lukita, debit or credit cards. This project arose from the necessity of the costumers and the convenience store owner due to the COVID 19 pandemic that we are experiencing in the current year 2020. In many cases, the population stopped going to the convenience stores, supermarkets, and local markets because the fear of catch the virus from another person. That is why technology began to be used more, such as virtual purchases and deliveries. The convenience stores associated with SHOP 360° are clear about the service they provide to the user meanwhile they are respecting security protocols. Currently, there is no direct competition that focuses on entrepreneurs. For this reason, Shop 360 ° was born to provide support to the small entrepreneur. Likewise, we have a competitive and motivated team to carry out this project, with the personalized attention of costumers.
Trabajo de investigación
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Almiron, Paliza de Silva Evelyn Lourdes, Flores Ibeth Deyanira Carbajal, Dongo Erick Xavier Franco, Peña José Manuel Miñano und Diaz Roxana Fransisca Yépez. „Sex-Shop Entrenos“. Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2020. http://hdl.handle.net/10757/655767.
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El presente proyecto, tiene como objetivo proponer un mejor servicio en la comercialización de productos sexuales. ENTRENOS es una idea de negocio que, con un modelo de negocio de manera sutil, educativo, cuidando la privacidad e incentivando el juego lúdico, venderá productos sexuales, dirigido a mayores de 18 años con capacidad adquisitiva que deseen descubrir como activar y potenciar su sexualidad y que requieren mejorar su experiencia sexual. Entrenos, genera un impacto en la sociedad a través del impulso de igualdad de género y el empoderamiento de hombres y mujeres independientemente de sus gustos y preferencias. Incluye y respeta a la comunidad LGTB y genera una cultura sexual saludable.
Uno de los principales factores que contribuirá con éxito de ENTRENOS, son las alianzas estratégicas que se deberá realizar con los aliados: inversionistas y socios claves para el financiamiento, desarrollo de herramientas tecnológicas, el abastecimiento oportuno de los productos y la entrega a tiempo de los productos al cliente.
El periodo de evaluación considerado para este proyecto es de cinco años. Considerando el escenario esperado, el proyecto presenta un Valor Actual Neto 9026,31 (VAN) soles, descontando a una tasa del 13,77% como COK. Además, la Tasa Interna de Retorno (TIR financiera) Asciende a 27,64 %, y el capital se recuperará en el año. Por lo expuesto, el plan de negocio de ENTRENOS es considerado como una buena oportunidad de inversión, ya que presenta una rentabilidad atractiva con un nivel de riesgo bajo.The present project aims to propose a better service in the commercialization of sexual products. ENTRENOS is a business idea that, with a business model in a subtle, educational way, taking care of privacy and encouraging playful games, will sell sexual products, aimed at people over 18 with purchasing power who wish to discover how to activate and enhance their sexuality and they need to improve their sexual experience. Trainings, generates an impact on society through the promotion of gender equality and the empowerment of men and women regardless of their tastes and preferences. It includes and respects the LGTB community and generates a healthy sexual culture. One of the main factors that contributes to the success of ENTRENOS, are the strategic alliances that must be made with allies: investors and key partners for financing, development of technological tools, timely supply of products and on-time delivery of products. The evaluation period considered for this project is five years. Considering the expected scenario, the project presents a Net Present Value (NPV) of nuevos soles, discounting a% rate as COK. In addition, the Internal Rate of Return (financial IRR) amounts to%, and the capital will be recovered in the year. Therefore, the ENTRENOS business plan is considered a good investment opportunity, since it presents an attractive profitability with a low level of risk.
Trabajo de investigación
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Ward, Peter W. „Optimizing ship-to-shore movement for Hospital Ship humanitarian assistance operations“. Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FWard.pdf.
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Thesis (M.S. in Operations Research)--Naval Postgraduate School, March 2008.Thesis Advisor(s): Salmeron, Javier. "March 2008." Description based on title screen as viewed on May 16, 2008. Includes bibliographical references (p. 59-60). Also available in print.
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Higgins, Brian E. „Motion analysis of a trolly interface for ship-to-ship cargo transfer“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FHiggins.pdf.
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Cannon, Stuart Martin. „Materials selection for ship structures“. Thesis, Brunel University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294827.
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Subramani, Dharmaraj. „Ship design for damage survivability“. Thesis, University of Newcastle Upon Tyne, 1995. http://hdl.handle.net/10443/484.
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This thesis presents a new set of methods to assist the process of ship design for safety with particular reference to collision damage. The study has two principal objectives: " investigations into subdivision aspects of passenger ships to improve their overall survival index " investigations into the subdivision of oil tankers in order to improve the effectiveness against spillage in the event of collision damage. In order to investigate the ship subdivision aspect a damage stability model was needed. A pre-requisite for developing the damage stability software was a robust but flexible method to define the hull and the compartments of subdivision. B-splines have been a popular representationatl ool in computer aided design over the past three decades.T his method, though more complex than other spline techniques such as cubic splines, was adopted with a fourth order basis function in this work. A complete set of spline manipulation libraries and associated numerical solvers were developed for this purpose. In addition to this, a method to define the intersection between the hull and the waterplane in the form of a closed B-spline curve for any given orientation of the vessel in terms of -heel, trim and draught was developed to aid the damage stability calculations. Though the earlier regulations stipulate fixed trim assessments to ease the computational process, it is clearly unsatisfactory and research has confirmed this to be a flawed approach. Free trim calculations on the other hand require an iterative and time consuming process to arrive at the equilibrium trim position for each heel angle. Pawlowski proposed a new method for the stability calculations of a freely floating rig when the unit is arbitrarily orientated to the wind direction. It uses the Euler theorem on the properties of equivolume waterplanes to arrive non-iteratively at the new inclined position. This theory was adapted for use in damage stability calculations and was numerically tested and proved to be sound. Damage stability calculations, though combinatorially large, are also inherently parallel. Parallel Virtual Machines (PVM) is a Message Passing Interface (MPI) developed jointly by ORNL, University of Tennessee, Carnegie Mellon University and the Pittsburgh Supercomputing centre. PVM enables a "virtual configuration" so that a collection of serial, parallel and vector processing machines appear as one large distributed memory computer. PVM was compared with another MPI called Network Linda where the advantage of PVM's user controlled message passing was demonstratedP. VM was used to implement the MJMD Distributed Memory paradigm to exploit this inherent parallelism in damage stability calculations and to obtain speedups. A systematic exploration of the search space for this design problem involves the generation of a large number of internal subdivision configurations. This, coupled with the fact that the design space was multimodal in nature made it suitable to the application of a class of heuristic search algorithms called Genetic Algorithms (GA). A brief description of the mechanisms behind GA is presented along with their mathematical basis in the form of two theorems: the schema theorem and the building block hypothesis. Various techniques for solving constrained optimisation problems with GA was explored. The penalty function method was found to be the most suitable and was finally adopted. The above techniques were applied to the optimisation. of the internal subdivision of passenger ships and cargo ships, oil tankers in particular. For passenger ships, the nature of the 's'-factor formulation on the local index was shown. The multimodal nature of the subdivision problem was highlighted and a GA was used to investigate the optimal subdivision characteristics of the vessel. The 's' factor formulation for cargo ship rules is different to that described by the A. 265 set of regulations for passenger vessels. In addition, the cargo ship rules describe a factor V which accounts for the probabilities of vertical extents of damages. However this formulation does not assign any credit for horizontal subdivision below the waterline. Data on vertical extents and vertical location of damages for cargo ships was collected and analysed in earlier studies done at Newcastle University. This data was used to develop a probability function akin to that developed for the longitudinal extent and longitudinal location so as to give credit for any horizontal subdivisions. The principal objective of this part of the study was to explore the search space for subdivision configurations that would minimize net oil outflow.
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Dadd, George M. „Kite dynamics for ship propulsion“. Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/351348/.
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Kite propulsion has emerged as an attractive means to harness wind power in a way that yields environmental and financial benefits. An understanding of the dynamics that affect kite motion and the resulting forces is required to facilitate the design and optimization of kite propulsion systems. In this thesis results from two line tension models are compared with experimentally recorded time histories for dynamic kite flight. New methodologies for investigating kite performance are established. The first zero mass model assumes that the kite and lines are weightless. The second, lumped mass model, considers the kites mass and thus makes use of the equations of motion. It is found that the two different models converge to the same result in the limit where the kite mass tends to zero. The zero mass model has been shown to compare favourably with experimental results. A method for parameterising figure of eight shape kite trajectories and for predicting kite velocity is presented. Results are shown for a variety of manoeuvre shapes, assuming realistic performance characteristics from an experimental test kite. Using a 320m2 kite, with 300m long flying lines in 6.18ms.
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Valdés, Mora María Isabel. „The new role of open registries as flag states : the battle for a better image in an increasing competitive shipping industry“. Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=81238.
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Under international law, every state has the sovereign right to establish the conditions under which it will grant its nationality to a vessel. By consequence, different schemes for ship registration have been developed, traditionally the nationalist and open system. While the nationalist system imposes strict requirements regarding national ownership and manning, along with burdensome fiscal regimes for the shipping industry, the open system offered flexible requirements and a friendly taxation environment, that help shipowners to minimize their operation costs.Open registries have been criticized for not complying with international accepted shipping standards in safety, environmental, and labour aspects. However, some of them have made great efforts to raise these standards, mainly obliged by the new demands of the shipping industry. Nonetheless, the shift to a new culture of quality shipping is not only a responsibility of flag states, but of all the actors of a maritime scenario.
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Jahnke, Joshua James. „Hydrostatic and intact stability analysis for a surface ship“. Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/58868.
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Thesis (S.M. in Naval Architecture and Marine Engineering)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 53).
Ship's lines are designed such that they are fair. To the naval architect, fairness means that the lines exhibit a continuous second derivative. This is the definition of a spline. Before the advent of digital computers, naval architects checked every line on a lines plan for fairness by bending a thin stick of wood, called a batten, on the line. If the line followed the natural bend of the batten, the line was fair. This phenomenon follows from the beam equation, which shows that the minimum energy in the beam occurs when the beam has a continuous second derivative of position. Hydrostatics lies at the heart of naval architecture. The hydrostatic properties of a hull are determined by the lines and their interpretation using rules of integration. The resulting analysis is presented in the form of graphs, termed the "curves of form" or "displacement and other curves." An intact stability analysis follows naturally from the hydrostatic analysis. Hydrostatics (determination of KM) coupled with a KG value can be used to predict initial stability. This intact stability analysis evaluates the range of stability at both small and large angles of inclination. The responses of the hull to static and dynamic loading situations can be inferred from the curves of form. Their most basic use is to determine the static waterline in various loading scenarios. A more subtle use is to determine the correct placement of the vertical center of gravity to ensure a sea kindly roll period, stability in beam winds, and stability in high speed turns. Various computational tools can be used to compute the hydrostatic and stability properties of a ship. This thesis explores the results from two computer aided design tools used by the U.S. Navy and commercial industry; Advanced Surface Ship and Submarine Evaluation Tool (ASSET) and Program for Operational Ship Salvage Engineering (POSSE).
by Joshua James Jahnke.
S.M.in Naval Architecture and Marine Engineering
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Wen, Naijun. „Optimization of ship-pack in a two-echelon distribution system“. Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61903.
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Thesis (S.M.)--Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2010.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 61-62).
The traditional Economic Order Quantity (EOQ) model ignores the physical limitations of distribution practices. Very often distribution centers (DC) have to deliver merchandise in manufacturer-specified packages, which can impose restrictions on the application of the economic order quantity. These manufacturer-specified packages, or ship-packs, include cases (e.g., cartons containing 24 or 48 units), inners (packages of 6 or 8 units) and eaches (individual units). For each Stock Keeping Unit (SKU), a retailer decides which of these ship-pack options to use when replenishing its retail stores. Working with a major US retailer, we have developed a cost model to help determine the optimum warehouse ship-pack. Besides recommending the most economical ship-pack, the model is also capable of identifying candidates for warehouse dual-slotting, i.e., two picking modules for the same SKU that carry two different pack sizes. We find that SKUs whose sales volumes vary greatly over time will benefit more from dual-slotting. Finally, we extend our model to investigate the ideal case configuration for a particular SKU, that is, the ideal size for an inner package.
by Naijun Wen.
S.M.
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Leghorn, Jeremy T. „Modeling for ship power system emulation“. Thesis, Monterey, California. Naval Postgraduate School, 2009. http://hdl.handle.net/10945/4302.
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CIVINSApproved for public release, distribution unlimited
With the U.S. Navy's continued focus on Integrated Fight Thru Power (IFTP) there has been an ever increasing effort to ensure an electrical distribution system that maintains maximum capabilities in the event of system faults. Non-Intrusive Load Monitoring (NILM), which has been used extensively for condition based maintenance applications, could simultaneously be used to enhance the existing zonal protection system employed with Multi-Function Monitors (MFM). A test platform with three 5000 watt synchronous generators is being constructed to emulate a U.S. Navy DDG 51 FLT IIA class ship electric plant. This is being accomplished in order to evaluate the feasibility of improving the fault isolation capabilities of the MFM with NILM implementation. The first step in this endeavor will be to electrically relate the test platform to the DDG electric plant. In order to accomplish this step, the fault simulation results from the test platform will be compared to simulated faults using U.S. Navy data from DDG 51 electric plants. This will allow for the fault isolation results from the test platform to be related to the DDG 51electric plant.
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Leghorn, Jeremy T. (Jeremy Thomas). „Modeling for ship power system emulation“. Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/50590.
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Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2009.Includes bibliographical references (p. 68).
With the U.S. Navy's continued focus on Integrated Fight Thru Power (IFTP) there has been an ever increasing effort to ensure an electrical distribution system that maintains maximum capabilities in the event of system faults. This is to ensure that the crew has the ability to complete real time tactical missions in the event of battle damage to any localized portions of the electrical distribution system. Fault isolation is a priority component of the U.S. Navy's Next Generation Integrated Power System (NGIPS) Roadmap, which lays out the framework as well as milestone dates for future development. Non-Intrusive Load Monitoring (NILM), which has been used extensively for condition based maintenance applications, could simultaneously be used to enhance the existing zonal protection system employed with Multi-Function Monitors (MFM). NILM may be able to, inexpensively, use the existing current and voltage sensors available from the MFM hardware to determine electrical loading which could allow for faster fault isolation capability. A test platform with three 5000 watt synchronous generators is being constructed to emulate a U.S. Navy DDG 51 FLT IIA class ship electric plant. This is being accomplished in order to evaluate the feasibility of improving the fault isolation capabilities of the MFM with NILM implementation. The first step in this endeavor will be to electrically relate the test platform to the DDG electric plant. In order to accomplish this step, the fault simulation results from the test platform will be compared to simulated faults using U.S. Navy data from DDG 51 electric plants.
(cont.) This will allow for the fault isolation results from the test platform to be related to the DDG 51 electric plant.
by Jeremy T. Leghorn.
S.M.
Nav.E.
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Soultatis, Charalambos. „Systems modeling for electric ship design“. Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33444.
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Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2004.Leaf 185 blank.
Includes bibliographical references (leaves 172-174).
Diesel and gas turbine electric ship propulsion are of current interest for several types of vessels that are important for commercial shipping and for the next generation of war ships. During the design process of a platform, a choice has to be made between two different fundamental concepts regarding propulsion; a conventional arrangement, and a diesel or gas turbine electric propulsion. For both concepts, the electrical installation is present and the demand for additional electric energy becomes a dominant parameter. In both cases, the selection of the prime mover significantly influences the effectiveness of the design. In this thesis, the simulation modeling of a complete propulsion system will be attempted, with overall emphasis on the prime movers. In the first part a diesel engine is considered. The time delay between changing a set point for the revolutions of the engine and the change of the real revolutions is often modeled as a first order system. However, this modeling is too simple to describe the real behavior of the diesel engine. More complex models exist, but in general they are too complex, describing the full thermodynamic behavior of diesels.
(cont.) So there is a need for a model that is more advanced than a first order system and less complex than complete thermodynamic models. Such a model has been derived, based on the Seiliger (thermodynamic) process. The results of the model show that the diesel engine behaves like a second order system when operating in the governor area and more like a first order system in the constant torque (overload) area. The simulation model of a diesel engine can be regarded as an explanation of the real engine operation, which combines the mathematical relationship between the relative components and can be used to simulate dynamic loading of the diesel engine. In the second part, a development of a nonlinear gas turbine model for loop- shaping control purposes is presented. The nonlinear dynamic equations of the gas turbine are based on first engineering principles. In order to complete the model, constitutive algebraic equations are also needed. These equations describe the static behavior of the gas turbine at various operating points.
(cont.) The complete, substituted nonlinear model is presented along with its model verification results based on a simulator and measured data. A mathematical description for the electric part of the propulsion and energy generation system with respect to numbers of components such as generators and thruster drives is attempted. Other electrical loads may be represented with an aggregate load. Based on the control functions focus on power production, advanced dynamic models shall be used for the generators and simplified static models shall be used for thruster drives and other loads. The final model shall be in a state-space vector form, suitable for control design. As a conclusion, a reliability analysis on the decision for the electric propulsion system is utilized based on market data, speed and electric energy requirements studies. The purpose of this study is to justify the employment of innovative and efficient electric propulsion systems for the future needs of the commercial and naval ship industries.
y Charalambos Soultatis.
Nav.E.and S.M.
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Roy, Michael Robert. „Stress intensity factors for ship details“. Thesis, Heriot-Watt University, 2009. http://hdl.handle.net/10399/2287.
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Montes, Anel A. „Network shortest path application for optimum track ship routing“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://handle.dtic.mil/100.2/ADA435601.
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Brainard, Benjamin Chase V. „An Underwater Explosion-Induced Ship Whipping Analysis Method for use in Early-Stage Ship Design“. Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/64508.
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This thesis presents an analysis method for determining the whipping response of a hull girder to underwater explosion (UNDEX) bubble pulse loading. A potential flow-based UNDEX bubble model capable of calculating the behavior of a migrating bubble for up to three pulses is developed. An approximate vertical plane ship vibration model is derived using fundamental beam theory by representing the ship as a free-free beam with varying cross-sectional properties along its length. The fluid-structure interaction is approximated using strip theory and the distant flow assumption. The most severe predicted whipping load conditions are applied to a MAESTRO finite element model of the ship as a quasi-static load case to determine the response of the structure to the whipping loads. The calculated hull girder bending moments are compared to the ultimate bending strength of the hull girder to determine if the girder will collapse. The analysis method is found to be a useful method for determining preliminary UNDEX-induced whipping design load cases for early-stage ship design. However, more detailed and accurate data is needed to validate and verify the predicted whipping responses.
It is found that the most severe whipping loads occur as the result of an UNDEX event that occurs under the keel near midship and produces a bubble with a pulsation frequency similar to the natural vibration frequency of the ship in its third mode. Significant damage to the ship structure and hull girder collapse is possible as a result of these loads.Master of Science
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Harper, Justin A. 1975. „Hull form optimization for monohull ships“. Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/91798.
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Thesis (S.M. in Naval Architecture)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 2003."June 2003."
Includes bibliographical references (leaves 128-132).
by Justin A. Harper.
S.M.in Naval Architecture
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Vestbøstad, Øyvind. „System Based Ship Design for Offshore Vessels“. Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for industriell økonomi og teknologiledelse, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15053.
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For the System Based Ship Design (SBSD) approach to be used in practice at a design office for Offshore Vessels the software supporting the approach need to be flexible to work for the great variation of ship designs and give the designer the amount of control that he need to be confident with the solution.The output of the SBSD approach is a list of volumes needed for the new build. Based on these volume demands combined with some experience data several key numbers and useful data like hull form and costs be derived.The list of volumes combined with a template describing their order and constraints can be utilized to create early 3D-sketches of the new ship. A prototype for this has been developed.The SBSD approach fulfills the requirements for sketching tools by Buxton (2006) and Gross (2006) and has the potential of being an efficient sketching tool for the designer that can follow the project through the initial design process.
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Schneider, Joseph M. „Measure of effectiveness for amphibious ship loading“. Thesis, Monterey, California. Naval Postgraduate School, 1990. http://hdl.handle.net/10945/30717.
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Approved for public release, distribution is unlimitedA critical factor in the success of an amphibious operation is how well the load plan supports the landing plan. The current manual system for ship load planning is time consuming and subject to error. A computer system currently under development by a contractor will decrease planning time and reduce mistakes by automating many details of the planning process. A method to assess the quality of load plans and make comparisons among them is also essential to improved planning. The scoring algorithm developed in this paper implements a measure of effectiveness (MOE) to make these comparisons by scoring a load plan's ability to support the landing plan. The algorithm provides the ability to differentiate qualitatively among loads by computing penalty scores for the critical areas of equipment left behind, compartment location, and compartment access.
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Hole, Simon K. „The temporal correlation log for ship navigation“. Thesis, Loughborough University, 1989. https://dspace.lboro.ac.uk/2134/14173.
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Modem computerised navigation systems on board ships require an accurate log for optimal performance. Traditional electromechanica1logs on board merchant ships have generally been replaced by Doppler logs, which refer the velocity to the sea-bed. However, their operational depth is limited and in deep water the velocity is referred to the water-mass some depth below the hull, where it is influenced by ocean currents. The velocity accuracy ultimately depends on the estimated local sound velocity. The acoustic correlation log has acoustic beams similar to a conventional depth-sounder, with a vertically downward propagation direction and a broad beamwidth. Compared to the Doppler log it is affected less by ship pitch and roll due to its broad beamwidth, and the velocity is virtually independent of the velocity of sound and is referred to the sea-bed to a greater depth. Temporal correlation logs use a two-hydrophone array and the time delay between the two received signals is used to calculate the velocity. The full potential of these logs for world-wide ocean navigation has not been exploited. This thesis investigates the requirements and conditions for temporal correlation logs on board ships to navigate satisfactorily on and off the continental shelf. An experimental temporal correlation log working at high-frequencies with continuous wave propagation is described. It is used to measure the velocity of a tracked platform moving across a water tank and the results are compared to their theoretical values. When fully developed, the log would be suitable for shallow-water operation, and techniques learned can be applied to a low-frequency deep-water correlation log.
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Al-Hamad, Khaled. „Tabu search for ship routing and scheduling“. Thesis, Brunel University, 2006. http://bura.brunel.ac.uk/handle/2438/5071.
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This thesis examines exact and heuristic approaches to solve the Ship Routing and Scheduling Problem (SRSP). The method was developed to address the problem of loading cargos for many customers using heterogeneous vessels. Constraints relate to delivery time windows imposed by customers, the time horizon by which all deliveries must be made and vessel capacities. The objective is to minimise the overall operation cost, where all customers are satisfied. Two types of routing and scheduling are considered, one called single-cargo problem, where only one cargo can be loaded into a ship, and the second type called multi-cargo problem, where multiple products can be carried on a ship to be delivered to different customers. The exact approach comprises two stages. In the first stage, a number of candidate feasible schedules is generated for each ship in the fleet. The second stage is to model the problem as a set partitioning problem (SPP) where the columns are the candidate feasible schedules obtained in the first stage. The heuristic approach uses Tabu Search (TS). Most of the TS operations, such as insert and swap moves, tenure, tabu list, intensification, and diversification are used. The results of a computational investigation are presented. Solution quality and execution time are explored with respect to problem size and parameters controlling the tabu search such as tenure and neighbourhood size. The results showed that the average of the solution gap between TS solution and SPP solution is up to 28% (for small problems) and up to 18% for large problems. However, obtaining an optimal solution requires a large amount of computer time to produce the solution compared to obtaining approximate solutions using the TS approach. The use of Tabu Search for SRSP is novel and the results indicate that it is viable approach for large problems.
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Grassi, Charles R. „A task analysis of pier side ship-handling for virtual environment ship-handling simulator scenario development“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA384256.
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Thesis (M.S. in Computer Science) Naval Postgraduate School, Sept. 2000."September 2000." Thesis advisor(s): Darken, Rudolph P.; Peterson, Barry. Includes bibliographical references (p. 127-128). Also available online.
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Nowak, Troy Joseph. „Archaeological evidence for ship eyes: an analysis of their form and function“. Texas A&M University, 2003. http://hdl.handle.net/1969.1/5798.
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During the late 19th century, a number of large marble eyes were discovered near the
Athenian naval facilities at Zea. Although initially published as the eyes of ancient
Greek warships, many scholars have doubted the validity of this attribution. A range of
hypotheses have been presented in attempts both to discredit the notion that they are ship
eyes, and to re-classify these objects.
Recent excavations of a Classical Period merchantman at TektaÃÂ Burnu uncovered a
pair of marble discs that again raise questions relating to the identity of the marble eyes
from Zea. A review of alternative hypotheses relating to the identity of these objects
based on textual, archaeological, and representational evidence, coupled with technical
analyses of their construction, form, and decoration, leads to the conclusion that the
marble eyes discovered at Zea, as well as the objects from TektaÃÂ Burnu, adorned the
bows of ancient Greek ships between the 5th and the 3rd centuries BC. Evidence for the
function of these objects is found in the works of Greek authors who show that the eyes
of ancient ships marked the presence of a supernatural consciousness that guided the
ship and helped to avoid hazards. Studies of eye representations on Archaic and Classical Greek domestic articles and
parallels in architectural decoration suggest that ship eyes may have also worked as
apotropaions to counter forces such as envy.
As early as the 5th century BC Greek and Latin authors attest to a fear and
understanding of envy's destructive power, which was believed to attack through the
actions of both gods and mortals. Theories related to the use of eyes as apotropaions that
could counter envy are presented based on analysis of material from the Archaic and
Classical Periods. Links are made between Hellenistic and Roman mariners and their
fear of this force, which was expressed in their use of devices that functioned to protect
them from its ill effects. It is possible that ship eyes in ancient Greece served as both
epiphanies and apotropaions used to counter envy.
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Mierzwicki, Timothy Stephen. „Risk Index for Multi-Objective Design Optimization of Naval Ships“. Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31742.
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The naval ship concept design process often embraces novel concepts and technologies that carry with them an inherent risk of failure simply because their application is the first of its kind. Failure is recognized by gaps between actual and required measures of performance, exceeded budgets, and late deliveries. These risks can be defined and quantified as the product of the probability of an occurrence of failure and a measure of the consequence of that failure. Since the objective of engineering is to design and build things to meet requirements, within budget, and on schedule the first time, it is important to consider risk, along with cost and performance, in trade assessments and technology selections made during concept design.
To this end, this thesis presents a simplified metric and methodology for measuring the risk of ship design concepts as part of a Multi-Objective Optimization tool for naval ship concept design. The purpose of this tool is to provide a consistent format and methodology for multi-objective decisions based on dissimilar objective attributes, specifically effectiveness, cost and risk. This approach provides a more efficient and robust method to search the design space for optimal concepts than the traditional â ad hocâ naval ship concept design process where selection and assessment are often based on experience, design lanes, rules-of-thumb and Imagineering.
This thesis begins with the results of a literature and information search that investigates and describes risk, engineering systems safety, and state of the art risk analysis techniques currently in practice. Based on this background, a simplified metric and methodology is developed to calculate, quantify, and compare relative overall risk in a naval ship design optimization. To demonstrate this method, a naval ship risk register is developed for a notional ship design. This register identifies potential cost, performance, and schedule risk issues. Risk item descriptions are further defined as a function of the design parameters (DPs) considered for the notional ship. Risk Factors (RF) are calculated for each risk item based on the DP selection. Each RF is the product of a Probability of Failure Occurrence (PF) and Potential Consequence of Failure (CF). An Overall Measure of Risk (OMOR) function is developed to measure the level of overall risk for a single concept design based on DP selections. A ship design case study is performed incorporating the OMOR function and risk items into a ship synthesis model capable of calculating cost, performance, and effectiveness. This case study uses a Multi-Objective Genetic Optimization (MOGO) to identify and define a series of non-dominated cost-effectiveness frontiers for a range of risk (OMOR) values. This new method for ship design optimization provides a novel approach and consistent format for multi-objective decision-making based on three dissimilar objective attributes: effectiveness, cost, and risk.Master of Science
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Simões, Marcus Vinicius da Silva. „Ship detection performance predictions for next generation spaceborne synthetic aperture radars./“. Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA401677.
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Thesis (M.S. in Physical Oceanography) Naval Postgraduate School, December 2001."December 2001". Thesis advisor(s): Durkee, Philip A . ; Paduan, Jeffrey D. Includes bibliographical references (p.53-54). Also available online.
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Zirilli, Antonio. „Intelligent autopilots for ships“. Thesis, University of South Wales, 2000. https://pure.southwales.ac.uk/en/studentthesis/intelligent-autopilots-for-ships(0cff80b7-e1b9-4c05-ac2f-06c15f714584).html.
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The design of automatic systems for steering a ship presents difficult challenges because of their dynamic properties which vary considerably within the range of sailing conditions. Automatic steering of ships has its origin at the beginning of the century and was prompted by the introduction of the gyrocompass. Until the earlier 70s almost all autopilots for a ship were based on the proportional-derivative-integral (PID) controller. The main disadvantage with PID controllers is that the optimal parameters setting can be achieved only for a particular sailing condition. This shortcoming was and is still dealt with in the framework of adaptive theory where the controller parameters are adjusted in the attempt to seek the optimum of a pre-set performance function. Despite such a potential advantage, at present adaptive control theory is limited to linear plants and requires a certain amount of a-priori information for a successful application. This thesis is concerned with the applicability of intelligent control techniques to the problem of designing course-keeping and course-changing autopilots for ships. For this reason the framework of intelligent control theory is introduced and a pragmatic definition of intelligent controllers is stated. The learning and adaptive features of neural networks and fuzzy logic systems are exploited and used to solve advantageously the control design problem. Adaptive networks are used as a unifying structure where different kinds of neural networks and fuzzy logic paradigms can be described. In this framework, comparisons between neural networks and fuzzy logic systems are made and results from one field can be easily extended to the other. Although the use of such systems for the design of autopilots is in its early stage, the majority of the contributions which have appeared in literature have focused on the use of feedforward networks trained with the back-propagation algorithm. The main contributions of this thesis are the critical analysis of the feedforward network controller trained with the back-propagation algorithm, the proposition of an alternative controller architecture based on the use of radial basis function networks and to give conditions under which the stability analysis of the intelligent controllers so designed can be evaluated.
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Baker, John M. „Routing a high value unit for optimized missile defense in coastal waters“. Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Mar%5FBaker.pdf.
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Thesis (M.S. in Operations Research)--Naval Postgraduate School, March 2008.Thesis Advisor(s): Wood, R. Kevin. "March 2008." Description based on title screen as viewed on April 28, 2008. Includes bibliographical references (p. 37-38). Also available in print.
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McCulloch, Thomas L. „Feasible Form Parameter Design of Complex Ship Hull Form Geometry“. ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2552.
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This thesis introduces a new methodology for robust form parameter design of complex hull form geometry via constraint programming, automatic differentiation, interval arithmetic, and truncated hierarchical B- splines. To date, there has been no clearly stated methodology for assuring consistency of general (equality and inequality) constraints across an entire geometric form parameter ship hull design space. In contrast, the method to be given here can be used to produce guaranteed narrowing of the design space, such that infeasible portions are eliminated. Furthermore, we can guarantee that any set of form parameters generated by our method will be self consistent. It is for this reason that we use the title feasible form parameter design.
In form parameter design, a design space is represented by a tuple of design parameters which are extended in each design space dimension. In this representation, a single feasible design is a consistent set of real valued parameters, one for every component of the design space tuple. Using the methodology to be given here, we pick out designs which consist of consistent parameters, narrowed to any desired precision up to that of the machine, even for equality constraints. Furthermore, the method is developed to enable the generation of complex hull forms using an extension of the basic rules idea to allow for automated generation of rules networks, plus the use of the truncated hierarchical B-splines, a wavelet-adaptive extension of standard B-splines and hierarchical B-splines. The adaptive resolution methods are employed in order to allow an automated program the freedom to generate complex B-spline representations of the geometry in a robust manner across multiple levels of detail. Thus two complementary objectives are pursued: ensuring feasible starting sets of form parameters, and enabling the generation of complex hull form geometry.
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Aryawan, Wasis Dwi. „An investigation into the potential of multiple rows ducted propellers for marine applications“. Thesis, University of Newcastle Upon Tyne, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275427.
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Gamelius, Alexander. „Multipurpose Ship Minor for the Swedish Coast Guard“. Thesis, KTH, Aeronautical and Vehicle Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11104.
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This survey is about how to measure the sea state. A view of the existing tecniques on the market and, when possible, the prices of now existing products is presented. The mainpurpose is to investigate the possibility to measure waves with an inexpensive free drifting wavebuoy. The maximum material cost has been set to around 3000 kr, which severely limits the possibilitis. Ideas of how to analyse data from such a buoy and analysehow reliable this data can possibly become, is presented. A prototype of a wavebuoy is described and also the test results of the buoy, together whith descriptions of how thetests have been conducted. Effort has been made to put light on the kind of problems and errors that may occure when using these methods. The tests have shown that it is possibleto measure waves with a free floating wavebuoy with only one accelerometer as activesensor. The design of the buoy is important to minimize the movements of the buoy,since when tilted the buoy does not give accurate data. The incoming data must befiltered and when that is done the bandwhith of the buoy decreases. In this case the buoycan measure waves with frequencies over 0.14 Hz, which in deep water means waves with wavelength less than 80 m. It is important to know that far too few tests in different wavespectras have been conducted to be sure of the achieved results. Further tests and investigations should be made and this survey is to be seen as a first step.
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Eriksen, Christofer Magnus. „Technical Condition Indexes for Ship Engine Auxiliary Systems“. Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11470.
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The topic of my individual Master Thesis study is the expansion of the Technical Condition Index (TCI) concept, developed at the Department of Marine Technology at NTNU, as to encompass the following Ship Engine Auxiliary Systems; Fuel Oil System, Lubricating Oil System and Cooling Water System. The first chapter is a literature study on condition monitoring techniques, including an introduction on the role of TCI’s and condition monitoring within a successful maintenance organization. FMECA analysis concluded during the candidate’s Specialization Project revealed three major common component groups subject to condition monitoring for the purpose of establishing TCI’; valves, pumps and heat exchangers. In order to reduce complexity and cost implications, TCI’s and the condition monitoring techniques providing input data should be based on standardized methods, applicable to all components within one such major group. For valves in the systems studied such standardized methods generally applicable to all valves could not be identified. The variety of valve types is vast, while common root-cause failure mechanisms are few, indicating that if valves truly are considered sufficiently critical to justify condition monitoring based on TCI’s, methods must be developed individually each system to be monitored. For pumps, TCI’s are proposed to be based on a combination of vibration monitoring and process parameter analysis. Vibration monitoring should be based on measurement of vibration velocity, given in mm/s-RMS at bearings. ISO standards classification threshold values are proposed utilized in the transfer functions for calculating TCI’s. TCI’s based on process parameter analysis of pumps should utilize the Head – flow test at duty point. This method requires repeatable measurements flow rate and pressure difference over the pump. TCI’s for heat exchangers are proposed to be based exclusively on process parameter analysis, where the parameter to be monitored is the reduction in the overall heat transfer coefficient. The heat transfer coefficient is calculated from measurement of inlet and outlet temperature of both mediums flowing through the heat exchanger as well as mass flow rate and knowledge of the specific heat capacity of at least one of the two mediums. Technical Condition Indexes proposed have been implemented into TeCoMan software for the Engine Fuel Oil System, and exemplified by calculation of aggregated higher level TCI’s using fabricated data. Detailed description of the TeCoMan software and how to efficiently include a planned condition monitoring programme to calculate TCI’s is included.
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Han, Yongqing. „Crack arrest toughness of weldments for ship structures“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0005/MQ43341.pdf.
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Kent, John. „Probability of brittle fracture for a cracked ship“. Thesis, University of Strathclyde, 2007. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21659.
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Fatigue cracking is a common problem in ships and can potentially lead to a catastrophic brittle fracture. This thesis presents a methodology to quantify the risk of leaving these cracks unrepaired while a ship remains in service. The most important variable affecting the probability of failure is the material fracture toughness. Test results carried out on samples taken from a number of ship steel plates are fitted using a modified 'master curve' approach. The approach links fracture mechanics toughness (characterised by Kjc in MPa√m) to the Charpy 27 joule temperature. A major innovation in the work is the use of time-dependent reliability to account for the variation in toughness as the crack extends by fatigue. The loading applied to the crack tip comprises three components: still water bending; wave induced bending; and residual stress. A number of methods used to calculate the probability of failure are compared, with the convolution integral identified as the most suitable. The methodology is successfully benchmarked against the trend in actual failure statistics from the Liberty ships to date. Target probabilities of failure are used to estimate crack lengths for repair. Taking a figure of 5 x 10⁻⁴ events per year as broadly typical of the observed frequency of brittle fracture in merchant ships the methodology suggests that this is equivalent to a crack length of 300 mm in grade A steel at 0°C. Given that cracks are unlikely to be found until they reach 200mm this provides a small margin of safety. For grade D steel the repair length is increased to over 1000mm potentially allowing the repair to be delayed to coincide with scheduled maintenance periods.
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Williams, Douglas. „Human Systems Integration Synthesis Model for Ship Design“. Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17477.
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Approved for public release; distribution is unlimitedCurrent fiscal constraints are driving the reduction of system life cycle cost (LCC). A key objective of HSI is the reduction of operational cost and the improvement of operational performance. This thesis seeks to develop a Human Systems Integration (HSI) Synthesis Model for Ship Design. This model is based on the premise that ship design characteristics interact with the domains of HSI. The thesis begins with an historical overview of ship architecture and technology and their interactions with the domains of HSI. The HSI Synthesis Model for Ship Design was developed using the Framework of Naval Postgraduate Schools Systems Engineering Ship Synthesis Model. Quantitative data analysis was conducted using Offshore Patrol Vessel (OPV) design data from Information Handling Services (IHS) Janes database. The data analyzed included 35 ships from 21 nations. Multiple regression analysis consisted of nine independent ship design variables and a response variable of manpower. Data analysis revealed that ship length and ship draught were statistically significant. The proposed HSI Synthesis Model accounted for 49 per cent of the variance of crew complement. This thesis lays the foundation for future qualitative and quantitative analysis of the interaction between ship design characteristics and HSI domains. Additionally, it provides an initial HSI model that can be expanded upon by including additional HSI domains and, ultimately, may lead to a viable design tool for HSI practitioners and systems engineers.
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Morehead, Steven Emory. „Ship track cloud analysis for the North Pacifi“. Thesis, Monterey, California. Naval Postgraduate School, 1988. http://hdl.handle.net/10945/23388.
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Sievenpiper, Bartholomew J. „Electrical ship demand modeling for future generation warships“. Thesis, Cambridge, Massachussetts, Massachussetts Institute of Technology, 2013. http://hdl.handle.net/10945/40262.
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CIVINSThe design of future warships will require increased reliance on accurate prediction of electrical demand as the shipboard consumption continues to rise. Current U.S. Navy policy, codified in design standards, dictates methods of calculating the average demand power. Using several modern sources of information for the DDG-51 class ship, this thesis investigates the utility of current analysis techniques and examines possible improvements. This thesis expands upon a basic method of modeling and simulation to develop a design tool that would provide an improved method of predicting ship electrical loads with increased fidelity of the ship's electrical demand. These efforts ultimately allow a better understanding of ship behavior to enable decision making in all stages of Naval ship design.
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Sievenpiper, Bartholomew J. (Bartholomew Jay). „Electrical ship demand modeling for future generation warships“. Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81589.
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Thesis (Nav. E. and S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 98-99).
The design of future warships will require increased reliance on accurate prediction of electrical demand as the shipboard consumption continues to rise. Current US Navy policy, codified in design standards, dictates methods of calculating the average demand power. Using several modern sources of information for the DDG-51 class ship, this thesis investigates the utility of current analysis techniques and examines possible improvements. This thesis expands upon a basic method of modeling and simulation to develop a design tool that would provide an improved method of predicting ship electrical loads with increased fidelity of the ship's electrical demand. These efforts ultimately allow a better understanding of ship behavior to enable decision making in all stages of Navy ship design.
by Bartholomew J. Sievenpiper.
Nav.E.and S.M.
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Trost, Christopher S. (Christopher Stone). „Framework for systematic evaluation of environmental ship design“. Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43457.
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Thesis (Nav. E.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997, and Thesis (M. Eng)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.Includes bibliographical references (leaves 104-107).
by Christopher S. Trost.
M.Eng
Nav.E.
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Katsoufis, George P. (George Paraskevas). „A decision making framework for cruise ship design“. Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/35707.
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Thesis (S.M. in Ocean Systems Management and S.M. in Naval Architecture and Marine Engineering)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.Includes bibliographical references (p. 91-97).
This thesis develops a new decision making framework for initial cruise ship design. Through review of effectiveness analysis and multi-criteria decision making, a uniform philosophy is created to articulate a framework that would enable a designer to more accurately assess what design alternatives are more important than others and how their changes affect the overall system being designed. Through a brief historical account, top-level Measures of Merit are developed and used with the framework and then applied to a requirements and effectiveness case study on initial concept development of a cruise ship. This is performed using Response Surface Methods to enable the user to visualize the design space as well as interact with it; the results and methods to visualize the design space are discussed. Finally, a Unified Tradeoff Environment is discussed, a framework that pools the aforementioned requirements and effectiveness analysis with design and technology forecasting to enable the user to make better informed requirements derivation and design selection.
by George P. Katsoufis.
S.M.in Ocean Systems Management and S.M.in Naval Architecture and Marine Engineering
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Donatelli, Matthew (Matthew Alfred). „Market-based approach for improving ship air emissions“. Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/51628.
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Thesis (S.M. in Transportation)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2009.Includes bibliographical references (p. 82-85).
This study considered how appropriate different market-based approaches are for the reduction of ship air emissions, particularly CO2. Furthermore, the study also considered which types of market-based tools may be available for application to the shipping industry. This project was not intended to design or optimize a system for the maritime community. The study considered the current input and discussions within the International Maritime Organization and its Marine Environment Protection Committee and identified three major thought patterns in proposed systems for the maritime industry: (1) an emissions trading scheme for the shipping industry, (2) CO2 indexing, and (3) alternative approaches. The most significant alternative approach is to place a levy on fuel bunkers. Other alternative approaches could involve hybrid systems using any combination of the other systems mentioned. The study identified a number of unresolved issues and tradeoffs that could hinder the implementation of these systems. These industry-specific issues include technical, policy, administrative, and infrastructure considerations. Currently, there is no consensus on which type of system to use or even whether any of these systems will be used. The study concludes with recommended steps towards emissions management for ship owners and operators.
by Matthew Donatelli.
S.M.in Transportation
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Nilsson, Lucas. „Estimation of Ship Properties for Energy Efficient Automation“. Thesis, Linköpings universitet, Reglerteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-133557.
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One method to increase efficiency, robustness and accuracy of automatic control, is to introduce mathematical models of the system in question to increase performance. With these models, it is possible to predict the behavior of the system, which enables control according to the predictions. The problem here is that if these models do not describe the dynamics of the system well enough, this method could fail to increase performance. To address this problem, one idea is to estimate the dynamics of the system during operation, using methods for system identification, signal processing and sensor fusion. In this thesis, the possibilities of estimating a ship's dynamics during operation have been investigated. The mathematical model describing the dynamics of the ship is a graybox model, which is based on the physical and mechanical relations. This model's properties are therefore described by physical quantities such as mass and moment of inertia, all of which are unknown. This means that, when estimating the model, these physical properties will be estimated. For a systematic approach, first a simulation environment with a 4-degrees-of-freedom ship model has been developed. This environment has been used for validation of system identification methods. A model of a podded propulsion system has also been derived and validated. The methods for estimating the properties of the ship have been analyzed using the data collected from the simulations. For system identification and estimation of ship properties, the influence of measurement noise and potential of detecting a change in dynamics has been analyzed. This has been done through Monte Carlo simulations of the estimation method with different noise realizations in the simulations, to analyze how the measurement noise affects the variance and bias for the estimates. The results show that variance and bias vary a lot between the parameters and that even a small change in dynamics is visible in some parameter estimates when only ten minutes of data have been used. A method based on cumulative summation (CUSUM) has been proposed and validated to analyze if such a method could yield fast and effective detection of system deviations. The results show that the method is rather effective a with robust detection of changes in the dynamics after about four minutes of data collection. Finally, the methods have been validated on data collected on a real ship to analyze the potential of the methods under actual circumstances. The results show that the particular data is not appropriate for this kind of application along with some additional problems that can yield impaired results.Genom att inkludera matematiska modeller som beskriver ett systems dynamik i styrningsalgoritmer, kan man åstadkomma en automatisk styrning med förbättrad effektivitet, robusthet och noggrannhet. Med dessa modeller går det att förutsäga beteendet hos systemet och därmed öppnas också möjligheten att använda sig av detta i styrningen. Problemet är att om dessa modeller inte beskriver systemets dynamik tillräckligt bra kan prestandan istället sänkas genom dessa metoder. Den här sortens problem kan man lösa genom att aktivt skatta systemets dynamik under körning, med hjälp av metoder för systemidentifiering, signalbehandling och sensorfusion. I denna exjobbsrapport har möjligheterna att skatta ett skepps girdynamik undersökts. Den matematiska modell som beskriver skeppets dynamik är en grålådemodell som baserar sig på fysikaliska och mekaniska samband. Denna modells egenskaper beskrivs därför av fysikaliska storheter så som massa, tröghetsmoment och tyngdpunkt, vilka alla är okända. Detta innebär att vid modellskattning skattas dessa fysikaliska storheter, vilka kan vara av stort intresse. En simuleringsmiljö med en skeppsmodell med fyra frihetsgrader har skapats och använts för att validera metoder för systemidentifiering. En modell av ett roterbart framdrivningssystem har också härletts och inkluderats i simuleringsmodellen. Vid systemidentifiering och skattning av skeppets egenskaper har dels inverkan av mätbrus analyserats samt även möjligheter till att detektera skillnader i dynamik. Detta har gjorts med Monte Carlo-simuleringar av skattningsmetoden med olika brusrealiseringar för att analysera hur mätbrus påverkar variansen och metodfelet hos skattningarna. Resultaten visar att vissa parametrar skattas med större noggrannhet och hos dessa kan därmed en förändring i dynamik identifieras när endast tio minuter av data har använts. En metod baserad på kumulativ summering av residualer har formulerats och validerats, detta för att undersöka om en sådan metod kan ge snabb och effektiv detektion av systemförändringar. Resultat visar på robusthet i att detektera skillnader i dynamik efter ungefär fyra minuter av datainsamling. Slutligen har metoderna validerats på data insamlad på ett riktigt skepp för att undersöka potentialen under verkliga omständigheter. Resultaten visar att just denna data inte är lämplig för denna applikation samt några problem som kan leda till försämrade resultat.
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Tober, Hampus. „Evaluation of drag estimation methods for ship hulls“. Thesis, KTH, Mekanik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277843.
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This study aims to evaluate to which degree CFD can complement traditional towing-tank experiments, and to develop a computationally cheap and robust methodology for these type of simulations. Two radically different surface ship hulls were chosen for the trials: a capesize bulk carrier and a fast displacement hull. A bare submarine hull was also used to benchmark the software in the early stages of the study. All simulations were Reynolds–Averaged Navier–Stokes (RANS) simulations using the k-w-SST turbulence model. The chosen software was OpenFOAM 5.x and foam-extend 4.1 coupled with the commercial expansion Naval Hydro Pack, which is supposed to handle high Courant numbers well. Producing a high-quality mesh which is able to capture both the free surface and the boundary layers proved to be of utmost importance and the meshing procedure is thus discussed in detail. A majority of the surface ship simulations suffered from a phenomenon known as numerical ventilation. The effect seemed to be much worse for the fast-displacement hull and the drag estimates for this hull deviated around 16.1% from experimental data. The bulk carrier was less affected and the drag estimates for this hull only deviated around 6.3% from experimental data. In order to reduce the computational cost, all surface ship simulations were run with a maximum Courant number of 25 and some consequences of this are also discussed.
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Han, Yongqing Carleton University Dissertation Engineering Civil and Environmental. „Crack arrest toughness of weldments for ship structures“. Ottawa, 1999.
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Wen, Charlie Hsiao Kuang. „Heuristic approaches for crane scheduling in ship building“. Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-07012008-141639.
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Stinson, Nicholas Taylor. „Refinement of Surface Combatant Ship Synthesis Model for Network-Based System Design“. Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90222.
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This thesis describes an adaptable component level machinery system weight and size estimation tool used in the context of a ship distributed system architecture framework and ship synthesis model for naval ship concept design. The system architecture framework decomposes the system of systems into three intersecting architectures: physical, logical, and operational to describe the spatial and functional relationships of the system together with their temporal behavior characteristics. Following an Architecture Flow Optimization (AFO), or energy flow analysis based on this framework, vital components are sized based on their energy flow requirements for application in the ship synthesis model (SSM). Previously, components were sized manually or parametrically. This was not workable for assessing many designs in concept exploration and outdated parametric models based on historical data were not sufficiently applicable to new ship designs. The new methodology presented in this thesis uses the energy flow analysis, baseline component data, and physical limitations to individually calculate sizes and weights for each vital component in a ship power and energy system. The methodology allows for new technologies to be quickly and accurately implemented to assess their overall impact on the design. The optimized flow analysis combined with the component level data creates a higher fidelity design that can be analyzed to assess the impact of various systems and operational cases on the overall design. This thesis describes the SSM, discusses the AFO's contribution, and provides background on the component sizing methodology including the underlying theory, baseline data, energy conversion, and physical assumptions.Master of Science
This thesis describes an adaptable component level machinery system weight and size estimation tool used in the context of a preliminary ship system design and naval ship concept design. The system design decomposes the system of systems into three intersecting areas: physical, logical, and operational to describe the spatial and functional relationships of the system together with their time dependent behavior characteristics. Following an Architecture Flow Optimization (AFO), or energy flow analysis based on this system design, vital components are sized based on their energy flow requirements for application in the ship synthesis model (SSM). Previously, components were sized manually or with estimated equations. This was not workable for assessing many designs in concept exploration and outdated equation models based on historical data were not sufficiently applicable to new ship designs. The new methodology presented in this thesis uses the energy flow analysis, baseline component data, and physical limitations to individually calculate sizes and weights for each vital component in a ship power and energy system. The methodology allows for new technologies to be quickly and accurately implemented to assess their overall impact on the design. The optimized flow analysis combined with the component level data creates a more accurate design that can be analyzed to assess the impact of various systems and operational cases on the overall design. This thesis describes the SSM, discusses the AFO’s contribution, and provides background on the component sizing methodology including the underlying theory, baseline data, energy conversion, and physical assumptions.
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Chong, Keng Shin. „Effects of short crested seas on the motions of a trolley interface for ship-to-ship cargo transfer“. Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03Mar%5FChong.pdf.
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