| Autor: |
Downs R; Volpe National Transportation Systems Center, 55 Broadway, Cambridge, Massachusetts 02142, USA., Page J; Volpe National Transportation Systems Center, 55 Broadway, Cambridge, Massachusetts 02142, USA., Durrant JT; Brigham Young University, N281 ESC, Provo, Utah 84602, USA., Gee KL; Brigham Young University, N281 ESC, Provo, Utah 84602, USA., Novakovich DJ; Brigham Young University, N281 ESC, Provo, Utah 84602, USA., Anderson MC; Brigham Young University, N281 ESC, Provo, Utah 84602, USA., Loubeau A; NASA Langley Research Center, MS463, Hampton, Virginia 23681, USA Robert.Downs@dot.gov, Juliet.Page@blueridgeresearch.com, taggart.durrant@gmail.com, kentgee@byu.edu, danielnovakovich@gmail.com, anderson.mark.az@gmail.com, a.loubeau@nasa.gov. |
| Abstrakt: |
Sonic boom measurements from recent flight tests have provided an opportunity to investigate effects of microphone installation on sonic boom waveforms, spectra, and metric levels in support of NASA X-59 flight test planning. While those flight tests used N-wave aircraft (F-18s), modeling studies were also conducted using source characteristics for a shaped low-boom aircraft. Of particular interest were the effects of receiver height on boom waveforms and metrics at elevated receiver positions, microphone installation, and local ground cover type. Reductions of more than 2 dB in A-weighted sound exposure level and perceived level were shown for 1.6 ft (0.48 m) microphone heights for 35º ray elevation angle. Measured and modeled results are described in this letter. |
