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Airframe Noise-In addition to engine noise, aircraft on landing approach generate noise from extended structures such as control surfaces and landing gear. The Aerostructures Group is working with NASA to develop low noise solutions for current and future airliners. Recently, a wind tunnel test on a landing gear model mapped the noise field surrounding the extended gear and its interaction with the downstream flaps, as shown bottom left. This is the first step in developing efficient solutions.
Jet Noise-Research is continuing in methods to improve engine jet mixing and improve efficiency while reducing noise. Tested nozzle configurations are shown in the photo at bottom right.
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Fan Noise-Aircraft engine noise on take-off and landing approach is an environmental hazard, which has proven costly to airline operators. The Aerostructures Group has been a lead in designing and improving the technology for noise abatement in modern large turbofan powered aircraft. Through an integrated approach of design and test, several improvements have been developed over the basic acoustic DynaRohr structure shown above right. Improvements have been made to structure life, durability, and cost. A multi- layered structure with improved acoustic properties is shown on the right. Research continues into higher temperature acoustic structures for nozzles, as shown below.
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