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D3 INSTALLATION EFFECTS EVALUATION
INFLIGHT STRUCTUREBORNE NOISE DETECTION
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accelerometers acoustic resonances acoustic seal acoustic shield airborne noise Average Structure-Borne Noise blocking mass Cabin Acoustic Correlation of Overall damping material damping treatment developed direct airborne dual shaker excitation engine engine/nacelle installation engine/nacelle mass evaluation frequency range frequency response function fuselage structure given in Figure in-flight structure-borne noise inch thick Installation Effects interior noise levels microphone responses MODE SHAPES nacelle NASA noise control measure noise reduction Overall Spatial Average propeller diameter propeller excitation propeller source propeller tone propeller wake propeller wake/vortex punos rear spars resonances response parameters roll inertia Sensors shown in Figure simulated fuel single shaker excitation solid wing/fuselage attachment sound pressure level Spatial Average Structure-Borne spectra spherical bearing standard deviation strain gages structural response structure-borne noise control structure-borne noise detection structure-borne noise levels structure-borne noise transmission test apparatus TUNED DAMPER Tuned Mechanical Damper Turboprop wing front spar wing structure wing weight