File Name: ship structural analysis and design owen hughes .zip
Published by Wiley in New York , Chichester. Written in English.
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. Projects completed since the annual report was published are listed in Table 5. Project descriptions follow, with the addition of a brief summary of the final report, which represents the CMS's understanding of the results as reported by the author. NTIS numbers also appear in Table 6.
Many recent reports may be available from the executive director of the SSC. Requests may be mailed to Commander Stephen E. Measurement of Ice Loads on Ship Structures. Objective Quantify bias and uncertainty in structural-strength formulations in order to evaluate safety margins and derive design criteria. Summary The report provides a methodology for the modeling and analysis of uncertainties in strength parameters that are suitable for the development of a reliability-based design method for ship structures.
The report identifies the failure modes of principal structural members of ships that involve modeling uncertainty and, based on a review of sufficient test data, demonstrates the methodology. Data were collected about strength parameters for the selected failure mode of panel compressive collapse, and the method was applied to assess uncertainties.
The report also identifies further research needs for uncertainty modeling and analysis of strength parameters. Technical Adviser Paul H. Wirsching, University of Arizona, Tucson. Objective Analyze the in-service failures in construction details using high-strength steels, identify problem areas, and recommend design and construction details to reduce problems. Summary The report calls attention to the problem of high-strength-steel structural details and provides a general methodology for assessing their strength using existing technology.
Examples using this methodology are presented for existing high-strength-steel structural details that have presented problems in service. Project Chair Philip G. Technical Adviser Roger G. Objective Develop approaches to assess the residual strength and life of marine structures that have sustained damage in service. Summary This report identifies key elements that are required to undertake an analysis to evaluate the residual strength of damaged marine structures.
Emphasis is placed on assessing the residual strength of marine structures that have been damaged due to normal operating loads. The report summarizes methods that are available to industry for evaluation of damage such as fracture. An example problem is presented that represents the application of an integrated approach to residual strength assessment to a particular ship type.
Project Chair John S. Technical Adviser Maria Celia C. Objective Assess the state of the art in estimating forebody hydrodynamic impacts on displacement ship hulls, and develop a plan for future research on hydrodynamic impact loadings on marine structures. Summary The report identifies theories of hydrodynamic impact loading that have been developed over the years by many researchers.
These theories and prediction methods are evaluated to identify those that are the most accurate, identifying gaps and assumptions that exist in the current technology.
These prediction methods are compared by applying them to two vessels. The report also identifies the need for future research to address the gaps and assumptions that are identified.
Project Chair Allen H. Technical Adviser Subrata K. Objective Develop a series of improved structural details that account for the unique fatigue stress pattern of ship structures. Summary The report presents a fatigue design strategy for welded ship structural details that is based on cumulative damage theory using nominal stress.
The approach is modified to account for the complex geometry of welded structural details of ships. Fatigue notch factors and stress concentration factors are derived from experimental data and finite-element analysis. Guidance is provided showing detail designers how to improve the fatigue life of details by using this approach.
Project Chair Chao Lin, U. Maritime Administration, Washington, D. Technical Adviser Robert L. Clark, Clark—Cim, Inc. Objective Develop a database on ice loads that could be used for probability-based design approaches. Assess the effects of ship displacement, impact location, and hull shape on the ice impact loads on icebreakers and other marine structures. Summary Beginning in August , the Nathaniel B. Palmer, a research vessel, operated for 3 weeks in mid-winter ice conditions, including first-year and second-year ice.
In addition to an instrumented bow panel, there were instrumented panels on the starboard side, the transom, and on the bottom, so that the relative magnitudes of the impact loads could be compared for similar ice conditions but different hull locations. Data from a total of ice-. This report covers instrumentation and data collection, analysis of the data gathered, and a comparison study between different ice-load measurement programs on different types of icebreakers.
Project Chair Rubin Sheinberg, U. Coast Guard, Washington, D. Objective Evaluate the effects of loadings such as vertical shear, membrane stress, and torsion in the mathematic model for stress analysis of stiffened plate panels, and propose revised design criteria as warranted. Summary The report presents the results of a study conducted to determine the effect of the stiffness characteristics of the supporting members of a grillage structure on plate panel stress.
Grillage scantlings were developed using a first-principles—based approach and then analyzed using finite-element analysis techniques to take into account the flexibility of the grillage stiffeners and to quantify the effects of vertical shear, membrane, and torsional stress components. The results are summarized, indicating that the stress in a plate panel can be 50 percent higher if the stiffeners deflect than if the stiffeners are rigid. Vertical-shear stresses are only 10 percent greater than normal stresses, and initial plate deflection does not significantly affect the behavior of stiffened plate structures.
The report also provides recommendations for future research. Objective Develop alternative structural system concepts for selected ship types that decrease labor requirements in design, fabrication, and outfitting phases. The structural systems should also be capable of low-cost maintenance during the life of a vessel.
Summary The report establishes foreign ship production baselines that are then used to evaluate alternative structural concepts from a construction time and manpower viewpoint. Project Chair Norman Hammer, U. Technical Adviser James R. Wilkins, Jr. Objective Perform a state-of-the-art assessment of the impact of human error nonphysical factors on the safety of marine structures. It would be a first step toward reducing the risk of failures due to human error and establishing procedures and guidelines to consider the effects of human error in design and the formulation of structural design criteria.
Summary The report presents an assessment of the influences of human error on the design, construction, and reliability of marine structures.
The report categorizes human factors, considers relevant case studies, identifies qualitative and quantitative processes for evaluating the incidence and effects of human error, studies the impacts of human error on design guidelines, and evaluates how marine critical structural components and systems should be designed to accommodate human and organizational errors.
The report also recommends fundamental approaches to improve the management of human and organizational errors in design and construction. Washington, D. Based on feedback from you, our users, we've made some improvements that make it easier than ever to read thousands of publications on our website.
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This page in the original is blank. Page 85 Share Cite. Login or Register to save! Stay Connected! Project Title. Uncertainty in Strength Models for Marine Structures. Hydrodynamic Impact on Displacement Ship Hulls. Hull Structure Concepts for Improved Producibility.
Authors: Javid Iqbal , Zhu Shifan. The development in the construction of unconventional ships and the implementation of lightweight materials have shown a large impulse towards finite element FE method, making it a general tool for ship design. This paper briefly presents the modeling and analysis techniques of ship structures using FE method for complex boundary conditions which are difficult to analyze by existing Ship Classification Societies rules. During operation, all ships experience complex loading conditions. These loads are general categories into thermal loads, linear static, dynamic and non-linear loads. General strength of the ship structure is analyzed using static FE analysis. FE method is also suitable to consider the local loads generated by ballast tanks and cargo in addition to hydrostatic and hydrodynamic loads.
Author s Owen F. The content of the publication is focusing on the most important areas of the preliminary ship structural design, presenting the relevant information in clear and easily understandable manner. The authors have covered the critical aspects of the design together with the general requirements as well as standard established formats. In the meantime it shall be understood that the dimensions of the vessel and sizes of all structural members involved are directly affecting the decisions made during the design process. One of the advantages of the approach applied by the authors of the volume is that it may be used with different ship types.
The text uses a rationally-based design approach design from first principles , which is ideally suited to preliminary structural design. One of the advantages of this approach is that, unlike all earlier design methods, it applies to all types of ships.
For a structure as large and as complex as a ship there are three levels of structural design, the second and most central of which is the subject of this book. Concept design deals with the topology or overall ge ometry of the structure; preliminary design establishes the scantlings structural dimensions of all principal structural members; and detail design is concerned with local aspects such as joints, openings, and rein forcements. Overall structural geometry is generally determined by overall design requirements rather than by structural requirements, while detail design is largely guided and constrained by fabrication methods and requirements.
- Все становится на свои места. Какой-то миг еще ощущались сомнения, казалось, что в любую секунду все снова начнет разваливаться на части. Но затем стала подниматься вторая стена, за ней третья. Еще несколько мгновений, и весь набор фильтров был восстановлен.
Старая электрическая сушилка для рук захватана грязными пальцами. Беккер остановился перед зеркалом и тяжело вздохнул. Обычно лучистые и ясные, сейчас его глаза казались усталыми, тусклыми. Сколько я уже тут кручусь. Однако считать ему не хотелось.
Стратмор поднял брови. - Целых три часа. Так долго.
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