Comparison Between Design and Installed Acoustic Characteristics of NASA Lewis 9- by 15-Foot Low-Speed Wind Tunnel Acoustic Treatment
What people are saying - Write a review
We haven't found any reviews in the usual places.
Other editions - View all
15-Foot Low-Speed Wind 15-ft test section acoustic characteristics acoustic driver acoustic impedance acoustic source admittance analytical predictions anechoic conditions angle of incidence Bessel function bulk density bulk-absorber material calculations characteristic impedance correction factor data analysis equation Bl exponential integral free-field measurement method frequency resolution full-depth treatment group delay Hard wall hard-wall measurement higher frequencies Hz Figure impedance and absorption incident signal Ingard and Bolt KEVLAR low-frequency Low-Speed Wind Tunnel material model measure the acoustic Measurement point measurement technique microphone NASA Lewis 9 normal-incidence measurements Nusselt parameter perforated plate phase plane wave Poco propagation constant reflected signal reflection coefficient sample tests shown in figure sine wave Soft wall soft-wall measurement sound field specific acoustic speed of sound sweep rate TDS measurement time-delay spectrometry tracking filter treatment absorption coefficient treatment design treatment model treatment using model tunnel test section two-layer treatment viscous loss term wind tunnel test