A new measurement method for separating airborne and structureborne noise radiated by aircraft-type panels
Michael C. McGary, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1982 - Technology & Engineering - 33 pages
What people are saying - Write a review
We haven't found any reviews in the usual places.
50 level dB 600 Frequency.Hz accelerometers acoustic and vibrational acoustic impedance acoustic input Acoustic Intensity Measurements acoustic particle velocity added damping airborne and structureborne airborne sound power aircraft-type panels aluminum sheet built-up aircraft panel coincidence frequency Comparison of measured COMPOSITE NOISE PREDICTED composite sound power cross-spectral figures 14 Fourier transform frequency range Frequency.Hz 800 Holography Interior Noise Langley Research Center Larry H mean-square surface velocity MEASURED COMPOSITE NOISE measured composite sound measurement method microphone mode shape NASA noise is dominant NOISE PREDICTED AIRBORNE NOISE PREDICTED STRUCTUREBORNE panel with added power and predicted PREDICTED AIRBORNE NOISE predicted airborne sound PREDICTED STRUCTUREBORNE NOISE predicted structureborne sound propeller-driven aircraft radiated by aircraft-type radiation-efficiency curves refs shown in figure sound power radiated sound pressure level Sound—power 50 level source room space-averaged structureborne noise radiated structureborne radiation efficiencies structureborne sound power test area test panel thin-shell structures transmission loss two-microphone vibrational inputs