Showing papers on "Shipbuilding published in 1982"

The outfit planning problem: Production planning in shipbuilding

Abstract: : Shipbuilding as currently practiced in U.S. commercial shipyards employs little quantitative modelling or analysis in production planning. This paper presents a brief discussion of the shipbuilding process and focusses on one major component which is referred to as outfitting. The outfit planning problem is described in detail and then formally modelled as a generalization of the resource constrained project scheduling problem. The value of the approach as well as barriers to its adoption are also discussed. (Author)

Innovative concepts for naval ship systems

Abstract: Increasing demands are being made of U.S. naval ship designers, to provide increased efficiency in both the use of space, and in the development of “highly energy-efficient” shipboard systems. This efficient use of space will allow the placement of additional (or larger) weapons systems on combat ships. The reduction of energy consumption, using energy-efficient ship systems, will extend a combat ship's cruising range. Therefore, the development of suitable advanced systems will enhance the military effectiveness of U.S. Naval Combat Ships. To achieve such improvements in naval ship design, many development programs are now in progress, both in the private sector (including Ingalls Shipbuilding Division) and in the U.S. Navy Establishment. An example of a major “NAVSEA-sponsored” program is the RACER program, in which a “highly-efficiency” COGAS (Combined Gas and Steam) system will be developed. This propulsion plant will be suitable for use on U.S. Navy Destroyers, and on other future naval combatants. In order to contribute to naval ship improvement, Ingalls Shipbuilding Division conducts an Independent Research and Development Program. This program includes the development of improved propulsion, ship's service power, and auxiliary systems. These include advancements in their type, efficiency (space and energy), and shipboard configuration. This paper will describe recent advances in these ship systems. Innovations to be described included advanced power plants (COGAS and other power plant configuration), and reduction of hull and appendage drag. Innovative auxiliary systems will include water purification, and energy-efficient auxiliaries. The emphasis will be on their viability for U.S. Navy application, and the potential for improved energy efficiency. Not all of the concepts described will be eventually implemented on naval ships. However, if those which do not result in hardware serve to stimulate discussion, and development of other innovative systems, this paper will have served its purpose.

Large-capacity container ship

Abstract: The invention relates to a large-capacity container ship for the transport by sea of cargo with a large stowage factor which is vertically loaded or unloaded. The aim of the invention, through a simplification of the ship construction, is to increase the transportability and at the same time thus increase the safety of container ships. The object of the invention is to create a container ship which enables the containers to be accommodated largely in closed spaces. To achieve the object, the container ship is to be designed in such a way that a superstructure with a height corresponding to the height of one or more containers and a length of at least 60% of the length of the ship is arranged on the hull in such a way that at least one cargo space of the hull forms with the superstructure a spatial unit which enables the containers to be arranged one above the other right into the superstructure, the superstructure being constructionally integrated entirely or partly in the top flange structure of the ship. The invention can be used in merchant shipbuilding.

The National Shipbuilding Research Program. Proceedings of the IREAPS Technical Symposium. Paper No. 18: Productivity Improvement in Shipyard Steel Fabrication Through Integrated Material Handling Technology

Abstract: : A significant portion of shipyard steelwork can be mechanized through introduction of modern production line technology. The productivity improvements on such lines arise principally from more efficient material handling and a corresponding reduction of time lost between operations. Panel lines are undergoing exiting developments and are being installed even in very small shipyards. Efficient and affordable web line and beam line technology is now available but not yet adopted by shipyards in the United States.

Robotic automation in advanced navy ship construction/repair technology

Abstract: This report on the robotic automation of the construction and repair of Navy ships focuses on the automation of three advanced manufacturing technologies: state-of-the-art welding, non- destructive testing, and surface preparation. The report presents a state-of-the-art survey of these technologies, identifies specific shipbuilding/repair processes to be automated, and discusses a conceptual design and economic analysis for each automation application. The report concludes by offering general remarks and recommendations related to the Navy's potential role in the automation of shipbuilding and repair. (Author)

The National Shipbuilding Research Program Product Work Breakdown Structure

Abstract: : The Product Work Breakdown Structure (PWBS) described herein is based upon that used by Ishikawajima-Harima Heavy Industries Co., Ltd. (IHI) of Japan. It has been developed and refined during the construction of over 2,000 ships in the last two decades. Thus, PWBS is not just based on theory. It has been repeatedly proven in shipyards in Asia a, Europe and South America and since the original publication of this book in November 1980, in the United States. PWBS employs the logic of Group Technology (GT) which is a method for applying mass production techniques to a variety of products in widely varying quantities. As applied to ship construction, PWBS classifies components to be purchased, parts to be fabricated and planned subassemblies in order to achieve coordinated work flows. In shipbuilding, as in other industries, GT has yielded substantial benefits even when resources remained essentially unchanged. PWBS features unprecedented integration of hull construction, outfitting and painting. Further, it features cost centers which exactly match a zone-oriented organization. The few revisions made in this issue emphasize the interdependency of a product work breakdown, statistical control of accuracy for productivity purposes and line heating. The revisions also include the substitution of pertinent photographs which depict the successful application of a product work breakdown in Avondale Shipyards, Inc.

Arrangement for section assembly of vessels in dock

Abstract: 1419162 Ship construction; rail vehicles RALPH M PARSONS CO and MITSUI SHIPBUILDING & ENG CO Ltd 17 Jan 1973 [24 Jan 1972] 1056/75 Divided out of 1419161 Headings B7S and B7L The subject matter of this Specification is the same as that of the parent Specification 1,419,161 but the claims relate to the construction of the rail-supported cars.

On getting our em act together and putting it on a navy ship

Abstract: Design and production of a fighting ship is more complex than even we in the shipbuilding community know. Electro-magnetic (EM) systems have become vital organs of the Navy combatant. EM communication systems provide mission guidance and coordination, EM navigational aids enable precise positioning worldwide, EM surveillance systems detect and warn of the threat, and EM tracking systems permit timely engagement. This paper addresses the major engineering disciplines competing and trading off to produce Navy ships. U.S. Navy activity in each area is discussed, with commentary on the systems engineering relationship among them, from the EM perspective. In stressing the need for whole ship systems engineering, the paper features an advanced communications system architecture and discusses its implications in ship design and performance. Assessments are made of present priorities and effectiveness and how close we are to realizing EM combat system integration.