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The Office of the Secretary of the Defense (OSD), Advanced Systems and Concepts, established the OSD Assured Fuels Initiative, which aims to spark commercial production of clean fuels made from U.S. energy sources for use by the U.S. Military. The Department of Defense (DoD) will provide the “spark” by developing the fuel specifications needed, demonstrating and qualifying the use of these fuels in tactical ground vehicles, aircraft, and ships, and transitioning to the full-time use of these fuels in their fleets operating in the U.S. One such clean fuel, Fischer-Tropsch (FT) synthetic fuel, made using low-temperature FT technology, contains no aromatic compounds.

Clean, very low sulfur fuels produced from domestic resources are of interest to the U.S. Military to enhance supply security and reliability versus continuing to rely on the supply of fuels that are either manufactured from an increasing percentage of imported oil or imported in increasing amounts as finished products. [1]* Synthetic Fischer-Tropsch (FT) fuel is one type of fuel that can be produced from domestic resources. FT fuels can be produced from a variety of non-petroleum feed stocks, such as natural gas, coal, petroleum coke, or even biomass and various wastes. Starting with reforming or gasification processes, the FT technology first produces synthesis gas (syngas) which is subsequently processed to high-boiling hydrocarbons. These hydrocarbons are then hydrocracked, hydroisomerized, and/or hydroprocessed to produce the desired liquid fuels. The military has a Single Battlefield Fuel Policy which mandates use of the JP-8/JP-5/Jet A-1 aviation turbine fuels.

Plastic parts have been proliferating the underhood environment for mass and cost savings. Noise control can become an issue with these parts. A noise cover can solve these problems. Data in this paper demonstrate the acoustical absorption capabilities of a nylon 6 / foam composite cover. Using these data, it becomes possible to predict the amount of attenuation using various thickness' of open-cell foam and nylon 6. The three most important factors to use when designing a new cover are acoustical absorption, transmission loss, and percentage of acoustical leakage around the cover or barrier.