Page 17: of Maritime Reporter Magazine (December 2000)

Ship Repair & Conversion

Elliott Bay Design Applies FEA

To Todd's Drydocks

Elliott Bay Design Group (EBDG) has already established a name for itself with its finite element analysis (FEA) work that has enhanced designs on a variety of vessels on a broad-spectrum range — from passenger vessels to off- shore oil platforms. The Seattle-based design firm recently set its sights on

Todd Pacific Shipyards, specifically on two of the yard's large floating drydocks to assess their capability for lifting Navy vessels and cruise ships.

EBDG project manager, Steve Harris, has cited that one of the drydocks is rated at 40,000 tons capacity, and is used for lifting U.S. Navy destroyers and larger cruise vessels, such as Holland

America's Stattendam Class. Key in this process is extensive computer modeling along with a comprehensive on-site physical inspection of the drydocks,

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Above: An FEA representation of the drydock that is pictured in the photo below, as prepared by EBDG; the different colors signify varying material thicknesses throughout the structure.

Circle 249 on Reader Service Cord including thickness measurements and corrosion analysis.

With end results verified by indepen- dent strain gauge testing, it was deter- mined through the FEA that the dry- docks met the Navy's requirements and were suitable for their assigned duties.

At the same time, EBDG offered rec- ommendations for improvements to the larger drydock that would minimize stresses present in large ship lifts. Todd immediately implemented these recom- mendations, which included the addi- tion of internal bracing.

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Celebrity's Millennium Arrives

At Newport News

Celebrity Cruise Line's innovative gas-turbine powered Millennium arrived at Newport News Shipbuilding (NNS) on November 18 for drydock and repair work.

The vessel, which is expected to remain in drydock at the yard for one month, will undergo modifications to its stern hull structure, underwater hull equipment inspections and underwater hull painting.

According to Becky Stewart, director, ship repair at NNS, " NNS is working in conjuction with the vessel's builder to manufacture structural components to be added to the exterior of Millennium that will modify the hull shape."

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