NOISE REDUCTION TECHNOLOGIES FOR ADVANCED SUBSONIC COMMERCIAL AIRCRAFT. THE OBJECTIVE OF THIS RESEARCH IS TO IDENTIFY LOW-NOISE LANDING GEAR DESIGN(S) THAT ARE SUITABLE FOR DEPLOYMENT ON REAL AIRCRAFT WITH ACCEPTABLE IMPACT ON WEIGHT STRUCTURE AND STOWABILITY. THE FINAL LOW NOISE CONFIGURATION SHALL TARGET A D-WEIGHTED OVERALL SOUND PRESSURE LEVEL (OASPL) NOISE REDUCTION OF 5 DB FOR AN OBSERVER DIRECTLY BELOW THE FULL SCALE MAIN LANDING GEAR WITH MINIMUM AND STRETCH TARGET GOALS OF 3 AND 8 DB RESPECTIVELY. THIS WILL REQUIRE A HOLISTIC APPROACH INVOLVING THE EVALUATION OF THE ENTIRE LANDING GEAR SYSTEM. AS SUCH THE GEAR THE WHEEL WELL DETAILS AND THE DOORS SHALL BE INVESTIGATED IN TASK I AND THE ADDITIONAL EFFECTS OF INTERACTION WITH THE HIGH-LIFT SYSTEMS AND THE CURVED LOWER FUSELAGE SURFACE WILL BE INCORPORATED IN TASK 2.THE FIRST TASK SHALL BUILD UPON THE KNOWLEDGE OF ISOLATED MAIN LANDING GEAR NOISE AND RECENT DEVELOPMENTS ON LANDING GEAR NOISE REDUCTION CONDUCTED AT NASA. BOTH PASSIVE AND ACTIVE NOISE REDUCTION CONCEPTS SHALL BE EVALUATED USING A SYNERGISTIC COMBINATION OF TIME ACCURATE NUMERICAL SIMULATIONS AND SUFFICIENTLY RELIABLE WIND TUNNEL MEASUREMENTS THROUGH WHICH A SUBSET OF MOST SUITABLE DESIGNS FOR LANDING GEAR NOISE REDUCTION CONCEPTS SHALL BE IDENTIFIED ON THE BASIS OF THEIR FEASIBILITY OF IMPLEMENTATION AERODYNAMICS AND NOISE REDUCTION.

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