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Damping Material Application Improvements

Objective

The goal for this project is to reduce the cost of select damping systems by 20%.

Background

Several thousand square feet of damping tile are installed on each Virginia Class Submarine (VCS). An opportunity exists to reduce the cost of installed damping by finding alternate materials and/or installation methods. Damping materials are used for inboard and ballast tank applications to reduce vibrations prior to reaching the outer hull. The tiles must meet MIL-P-23653 and MIL-T-24487 requirements, which include damping characteristics, adhesion strengths in peel and shock, toxicity, flame retardancy and others. The application process for the tiles is labor intensive and has significant potential for reduction.

Technical Approach

Alternate adhesives have been down-selected as a cost-effective approach with relatively low technical risk. The down-selected materials are pressure-sensitive adhesives available in peel-and-stick sheets. While the use of a pressure-sensitive adhesive can significantly reduce the cost of damping, some technical deficiencies still exist.

Benefits

Implementation is being pursued at Huntington Ingalls Industries - Newport News Shipbuilding and General Dynamics Electric Boat for Type II, Class 1 and Class 2 applications. Pending successful test results, the benefits for implementing pressure sensitive adhesive are $715K per hull. This cost reduction takes into account installation labor, material costs, and damping support labor.

Implementation

Data generated under the current ManTech project will be used after project transition to verify performance of the damping system with pressure sensitive adhesive. Since implementation would affect virtually all areas of the sub, large- scale testing will be conducted to verify performance. PMS 450 is responsible for conducting these tests and determining final acceptance for implementation, which is expected to affect Block IV production in 2014.

Status

Completed