The National Shipbuilding Research Program. 1993 Ship Production Symposium. Paper No. 13: An Engineering Product Model Based on STEP Protocols
The National Shipbuilding Research Program. 1993 Ship Production Symposium. Paper No. 13: An Engineering Product Model Based on STEP Protocols

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Published: 1993

Total Pages: 14

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Draft STEP application protocols, developed by the Navy Industry Digital Data Exchange Standards Committee (NIDDESC), have been issued to define the information content of a product model for a ship. The work reported in this paper combines the existing CAD models of the DDG51 Class design with a newly developed non-graphic database so that the overall information content complies with the STEP protocols. This work represents the first-time implementation of the application protocols and is a significant step in the Navy's plan to do the design of variants of the DDG51 Class totally in CAD. The combined graphic/non-graphic database is referred to as the DDG51 engineering product model. Emphasis has been placed on populating the non-graphic database with the information necessary to perform all required engineering analyses. The basic schema described in this paper may be extended to support other areas of interest, such as logistics support. technology. As a cost saving initiative and quality improvement measure, the Navy has implemented the use of 3-D Computer Aided Design (CAD). This effort required the development of leading edge CAD technology and the achievement of a cooperative (rather than competitive) success story by the two DDG51 Class shipbuilders and other industry participants. Over 2,500 drawings, many of which contain over 30 sheets per drawing, are required to build an AEGIS destroyer. Maintaining an error free design baseline defined by these drawings has proven to be a challenge in a 2-D manual environment. To improve efficiency, the entire design is being converted to 3-D CAD. The DDG51 design consists of 77 design zones. A 3-D computer generated representation of each of these zones is being developed. These models contain library parts defining equipment and machinery arrangements, structure, ventilation, electrical, and piping distributive systems.

American Shipbuilding Quality Standards. Volume 3. Coatings
American Shipbuilding Quality Standards. Volume 3. Coatings

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Published: 1999

Total Pages: 27

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To achieve success in ship construction, it is necessary for the ship owner and the ship builder to agree on the level of quality in the final product. Classification rules, regulatory requirements, and ship specifications all help to define an acceptable of level of construction quality; however, this guidance alone is not sufficient. Therefore, it is up to the shipbuilder to sufficiently describe the level of workmanship that will be reflected in the delivered ship and for the ship owner to effectively communicate his expectations for the final product. It is the intent of this document to contribute to these objectives in the following ways: 1. To describe a reasonable acceptable level of workmanship for commercial vessels built in the United States. 2. To provide a baseline from which individual shipyards can begin to develop their own product and process standards in accordance with generally accepted practice in the commercial marine industry. 3. To provide a foundation for negotiations between the shipbuilder and the ship owner in reaching a common expectation of construction quality. The acceptance criteria herein are based on currently practiced levels of quality generally achieved by leading international commercial shipbuilders. These criteria are not intended to be a hard standard with which all U.S. shipyards must comply. Rather, they are intended to provide guidance and recommendations in the key areas that play a major role in customer satisfaction and cost-effective ship construction. The project that resulted in this standard was developed by the National Shipbuilding Research Program's Marine Industry Standards Panel as part of its charter to promote the value of standardization in commercial ship construction.