Sequencing and Scheduling

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Sequencing and Scheduling

Project Participants: General Dynamics Electric Boat

Project Start: May 2009

General Dynamics Electric Boat (EB) has a pressing need for improved tools to enable better planning and sequencing of the various tasks and trades involved in outfitting a VIRGINIA-Class Submarine (VCS) hull. This project developed an advanced visualization application that will provide the ability to visualize the assembly and disassembly of submarine components internal to the hull.

This project sought to determine an optimal sequence for which a given assembly is to be built in the outfitting phase, thereby minimizing cycle time. The ultimate objective of this effort was to provide the ability to quickly and easily analyze where work is being accomplished and ensure that it is being done in the correct sequence and as early as possible in the manufacturing and outfitting schedule. The earlier in the manufacturing process work is accomplished, the more economical it is to perform; therefore, the overriding guiding principle is to minimize all in-hull production tasks and maximize shop production work. In support of these efforts, the team advanced the functionality of EB’s OneStop, a tool that extracts geometric data for the VCS structure and facilitates the planning process.

This project sought to determine an optimal sequence for which a given assembly is to be built in the outfitting phase, thereby minimizing cycle time. The ultimate objective of this effort was to provide the ability to quickly and easily analyze where work is being accomplished and ensure that it is being done in the correct sequence and as early as possible in the manufacturing and outfitting schedule. The earlier in the manufacturing process work is accomplished, the more economical it is to perform; therefore, the overriding guiding principle is to minimize all in-hull production tasks and maximize shop production work. In support of these efforts, the team advanced the functionality of EB’s OneStop, a tool that extracts geometric data for the VCS structure and facilitates the planning process.

At the conclusion of the project, the team had successfully generated a complete ship view (at least 80%) including all disciplines. This addition to the OneStop software makes it considerably easier for users to automatically find opportunities for re-sequencing. It also simplifies communication between the planners who recommend changes and the planners who must then enter that data into the business system.

It is expected that when fully implemented, this project will result in a savings of $1.3M per VCS hull. Additionally, findings from this project should be applicable and beneficial to construction activities at other major shipyards. Improvements in this area are not limited to submarines, but are also applicable to all US Navy platforms.

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