Showing papers on "Shipbuilding published in 1994"

Wooden Ship Building and the Interpretation of Shipwrecks

Abstract: This guide to wooden boats and ships is intended for use by nautical archaeologists and historians, and those involved in documenting and interpreting the remains of wrecks or abandoned vessels. The first part of the book introduces the discipline and presents basic information on ship and boat and ship construction. Part two investigates ancient, medieval, and postmedieval shipwrecks in turn, and represents a cross section of shipbuilding technology as seen through the interpretation of a select group of finds. The final part addresses the techniques of recording hull remains, assembling archival information, reconstructing vessels, and converting data into plans and publications, based on work done on previous projects. Also included is an illustrated glossary, specifically designed for archaeological use, and a select bibliography.

Medieval ships and shipping

Abstract: Introduction - medieval maritime Britain shipbuilding - the traditions of the northern seas shipbuilding - interaction and innovation fitting, steering and rigging British horizons, foreign ships carrying trade ports inland water transport fishing ships in warfare pilotage and navigation.

Establishing the fundamentals of a surface ship survivability design discipline

Abstract: This paper describes a conceptual structure of ship survivability definitions and concepts and deals with the need to incorporate a total-ship approach to surface ship combat survivability as part of the philosophy used to guide a ship's design. Included are: * A discussion of the increasing emphasis placed on ship survivability during the ship system development process. * Definitions of the different aspects of ship survivability, in order to suggest a coordinated and coherent understanding of their relationships. * A discussion of the value of making survivability considerations an integral part of the ship design philosophy, to ensure a requirements-based systems approach to all of the ship's required attributes, including survivability.

An Assessment of Current Warship Damaged Stability Criteria

Abstract: Current damaged stability criteria for the design of warships is outdated. The U.S. Navy criteria, consolidated in Design Data Sheet (DDS) 079–1, was developed over four decades ago, based largely on World War II battle damage experience. The validity of this standard is assessed with regards to the method in which it is assigned, its historical basis, and assumptions of wind and sea conditions. In general: combatant ships with a length greater than 300 feet must be able to withstand a shell opening of 15 percent along the waterline, while auxiliary ships must be able to withstand a shell opening of 12.5 percent. A warship's ability to withstand underwater damage is determined by an analysis of reserve buoyancy (floodable length) and damaged stability. A comparison of the design standards used by various navies reveals great similarities and some notable differences. Contemporary weapon threats and increased operational demands have changed the traditional ship design equation. The Ship Operational Capabilities Study has emphasized the need for modern ships to be able to fight hurt. Fortunately, a review of combatant ship model testing demonstrates that ships can be made more survivable. DDS 079–1 should be modified to incorporate some stability criteria developed by other nations, and impose more demanding environmental conditions.

The sea shadow

Abstract: The Sea Shadow (designed, built and tested during the mid-1980s) represents the application of several advanced ship technologies. The Sea Shadow was recently reactivated and has been undergoing additional testing at Santa Cruz Island and in San Francisco Bay. This paper provides a top level description of the ship and ship systems, is supported by photos & sketches, and alludes to the types of data and experience base which exists. The presentation of the paper includes video of the exterior and interior of the ship, the ship systems, and its at-sea operations.

China's potential and global strategy in shipbuilding industry

Abstract: Shipbuilding, perhaps more than any other industry, has been subject to a major shift in geographic distribution in recent years. In the post-World War II period, the British shipbuilders succumbed to the other western European shipbuilders who by then commanded the most sophisticated technologies. Before long, however, these western European shipbuilders lost their market share leadership to the Japanese. Today, a potential challenge to the indomitable Japanese shipbuilders is coming from South Korea and other NICs. In shipbuilding industry, a lot of people have predicted that China may well emerge as the industry leader toward the end of the twentieth century. But no one in western countries goes to the depth to do some research to analyze where on earth the comparative advantage exists in China's shipbuilding industry. In my thesis, I am trying to introduce the China's shipbuilding industry in detail and use Michael Porter's theory about competitive advantage to analyze where the competitive advantage and disadvantage of China's shipbuilding industry are. Michael Porter's insight has been to highlight the reasons why certain industries are so strong in certain countries and vital importance of "clusters" of industry environment. By analyzing the historical global shifts of shipbuilding industry, we could see the interaction among the determinants in the shipbuilding industry and how the effectiveness of these interactions decides the competitive advantage of nation's shipbuilding industry. The large source of labor and enormous domestic demands of the ships are one of China's advantage. With the help of license agreements and joint ventures, China is fagging to establish its reputation in shipbuilding industry in a short time. I will suggest a cost focus strategy for China's shipbuilding industry at the present time. When the industry goes into maturity, China could adopt cost leadership strategy to compete other shipbuilding nations. Thesis Supervisor: Frankel E.G. Title: Professor of Ocean Systems and Management

Integrated coordination modules for the shipbuilding industry

Abstract: Due to the characteristics of customer order processing and the production process in the shipbuilding industry, adoption of a modern production management concept suitable for repetitive production is prevented. For this reason this paper outlines a two-level approach developed specifically for one-of-a-kind production. Based on this one-of-a-kind production, a set of application modules to support the centralised coordination level are presented with regard to their functionalities. The tasks of these modules and their interplay are described in an exemplary scenario.

The niddesc ship product model: the step solution /

Abstract: NAVY/INDUSTRY DIGITAL DATA EXCHANGE STANDARDS COMMITTEE STANDARDS FOR THE EXCHANGE OF PRODUCT MODEL DATA.

A reference architecture for shipbuilding product models

Abstract: One of the main goals of the German research project ITiS is to develop a shipbuilding product model in accordance with the merging international standard for the development and implementation of product models STEP (ISO-10303). Due to expected high complexity of models in the shipbuilding domain, it is necessary to supplement the current modelling methodology of STEP in a proper way. On the one hand this is aimed at the completeness of the model scope, on the other hand it is essential for the implementation, that formal correctness, ie consistency and unambiguousness of the model can be ensured. Therefore a shipbuilding reference architecture is proposed. Its main purposes are: 1) to coordinate the management of the model, ie to assign subtasks within the modelling process and to integrate the developed model partial models into a unified structure; 2) to ensure consistency of the full model: and 3) to present an adequate overview and documentation of the model. This leads to a structured organization for the whole modelling domain. Disjoint sub-domains relevant for shipbuilding and relationships between them are represented in a global map. Hence the macroscopic structure of the reference architecture supports a top-down view on the overall product model, supplementing current bottom-up approaches. The shipbuilding reference model presented has a significant impact on the effective management and maintenance of the complex product model SHIP.

Total quality leadership at Supervisor of Shipbuilding

Abstract: With the close of the cold war and a shrinking defense budget government organizations are seeking to reduce the cost, while increasing the productivity of its operations. The Supervisor of Shipbuilding (SUPSHIP), within the Naval Sea Systems Command, is attempting to use Total Quality Leadership (TQL) to reduce redundancy and strengthen its position as auditor, accountant, and quality assurance expert for the design, construction, and delivery of naval vessels. This thesis reviews the mission and organization of SUPSHIP and what role TQL is playing in that organization. The author sent surveys to nine SUPSHIP offices, eight of which replied. Three offices were chosen ior further examination and on-site visits were conducted. The survey results for all eight of the respondents is enclosed as is a more in depth analysis of what was found at the three site visits. The thesis then analyzes progress made and concludes with recommendations for improvement. Thesis Supervisor: Professor Henry S. Marcus Title: NAVSEA Professor of Ship Acquisition

The design of the ff-21 multi-mission frigate

Abstract: The FF-21 concept has been developed by Newport News Shipbuilding, with team partners John J. McMullen Associates as design agent and Hughes Aircraft Company as combat system integrator. This paper discusses the mission of this small combatant ship, its design philosophy, and the overall technical approach used in development of the concept. Principal characteristics, combat system components, capabilities, and HM&E features of the concept design are described. Finally, this paper discusses FF-21 configuration and arrangement considerations during concept development.

Computer-aided planning of shipbuilding operations

Abstract: The planning of shipbuilding operations has to be based on the discrimination of activities, on their nature, on their priorities and on their interactions Network analysis based on critical path techniques takes these parameters into account and provides the ability to promote shipbuilding planning by minimizing the overall shipbuilding project duration However, the shipbuilding operations are subject to uncertainties such as unexpected delays due to material purchase acquisition difficulties, productivity "lows", etc and the introduction of PERT techniques ensures that project completion can be achieved within certain time limits for which a probability of success applies A typical construction operation is presented and discussed in order to exemplify the principal of PERT application It becomes evident that the time optimisation of the overall shipbuilding project from its start and in progress may only be achieved by a computer-analyzed network of detailed shipbuilding activities for which the PERT algorithm applies

Research into strength and vibroinsulation properties of epy plastic

Abstract: The paper presents results of research into strength and vibroinsulation properties of the Polish make EPY plastic applied for foundation pads in installation of the ship main engines and auxiliary machines. Vast experience gained from many years of successful application of several versions of the EPY plastic pads in the Polish shipbuilding and ship repair industries is summarized. In consequence of the reported research more effective and rational usage of the plastic material is expected.

Simulation - a powerful tool for the shipbuilding industry

Abstract: This paper focuses on exploiting the use of simulation in shipyards and in which way this powerful tool may be further developed for the benefit of the industry. This is done by discussing simulation in a historic perspective and by comparing the use of simulation to other types of industry. The areas of utilitarian value for the use of simulation in the shipbuilding industry, both with respect to today's and tomorrow's technology, are highlighted and discussed in detail. Also, the paper explains the simulation tool's possibilities and positive effects, and how a specific problem can be solved using this technique.

Testing the seakeeping performance of ship models in natural seas

Abstract: This paper describes a methodology for ship model experimentation in natural, wind-generated waves. Although results from some experiments are presented, they are used as examples of the information which can be obtained, rather than as illustrations of the performance of particular types of ship. The main objective is to demonstrate a rigorous approach to the experiment design.

A Reference Model for the Computer-Aided Design of Hull Forms

Abstract: The efforts to utilize modern computers for the hull form design of ships, started in the 1960s. In Korea, tools for the computer-aided hull form design such as FORAN system have been used from the 1970s. However, the development efforts for such tools have just started. To maximize the output from the limited research resources in this field, a reference model for the development is proposed. The model cail be used to decompose the task into sub-tasks, and to integrate the separately developed component technologies afterwards. To produce the reference model, the state-of-the-arts has been surveyed. including both foreign and domestic researches, within both shipbuilding industry and general CAD sectors. In the process, component functions for the hull form design have been identified. The reference model is constructed using these identified component functions.