Author: Jack D. LeatherwoodPublisher:
ISBN:
Category :
Languages : en
Pages : 32
Book Description
Laboratory Study of Effects of Sonic Boom Shaping on Subjective Loudness and Acceptability
Author: Jack D. LeatherwoodLaboratory Study of Effects of Sonic Boom Shaping on Subjective Loudness and Acceptability
Author: National Aeronautics and Space Adm NasaPublisher:
ISBN: 9781729002773
Category :
Languages : en
Pages : 38
Book Description
A laboratory study was conducted to determine the effects of sonic boom signature shaping on subjective loudness and acceptability. The study utilized the sonic boom simulator at the Langley Research Center. A wide range of symmetrical, front-shock-minimized signature shapes were investigated together with a limited number of asymmetrical signatures. Subjective loudness judgments were obtained from 60 test subjects by using an 11-point numerical category scale. Acceptability judgments were obtained using the method of constant stimuli. Results were used to assess the relative predictive ability of several noise metrics, determine the loudness benefits of detailed boom shaping, and derive laboratory sonic boom acceptability criteria. These results indicated that the A-weighted sound exposure level, the Stevens Mark 7 Perceived Level, and the Zwicker Loudness Level metrics all performed well. Significant reductions in loudness were obtained by increasing front-shock rise time and/or decreasing front-shock overpressure of the front-shock minimized signatures. In addition, the asymmetrical signatures were rated to be slightly quieter than the symmetrical front-shock-minimized signatures of equal A-weighted sound exposure level. However, this result was based on a limited number of asymmetric signatures. The comparison of laboratory acceptability results with acceptability data obtained in more realistic situations also indicated good agreement. Leatherwood, Jack D. and Sullivan, Brenda M. Langley Research Center RTOP 537-03-21-03...
Scientific and Technical Aerospace Reports
Author: Innovation in Flight
Author: Joseph R. ChambersPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 406
Book Description
Community Response to High-energy Impulsive Sounds
Author: Sanford FidellPublisher: National Academies
ISBN:
Category : Noise
Languages : en
Pages : 70
Book Description
Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1786
Book Description
Monthly Catalog of United States Government Publications
Author: United States. Superintendent of DocumentsPublisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1072
Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
NASA Technical Memorandum
Author: A Laboratory Study of Subjective Response to Sonic Booms Measured at White Sands Missile Range
Author: Subjective Response to Simulated Sonic Booms with Ground Reflections
Author: B. M. SullivanPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 38
Book Description