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Two procedures for adjusting as-measured test-day spectra to reference day conditions - the Society of Automotive Engineers' (SAE) Aerospace Recommended Practice (ARP) No. 866A (866A) and a procedure utilizing pure-tone absorption equations, developed in support of the International Organization for Standardization's (ISO) 9613-1 and the American National Standards Institute's (ANSI) S1.26-1995, and refined for application to one-third octave-band data- were evaluated and compared. The ISO and ANSI pure-tone absorption equations are identical to each other. The 866A procedure historically has been used for atmospheric absorption corrections for Federal Aviation Regulations (FAR) Part 36, Noise Standards: Aircraft Type and Airworthiness Certification and similar regulations of the International Civil Aviation Organization (ICAO). The ISO/ANSI procedure analyzed herein is under consideration for inclusion into harmonized regulations. This document presents a comparison of data corrected to several distances using the two different methodologies.
  • ISBN13: 9781494956196
  • Publisher: Createspace
  • Pubilcation Year: 2002
  • Format: Paperback
  • Pages: 00078
Publication DateApril 30, 2002
Primary CategoryTechnology & Engineering/Aeronautics & Astronautics

A Sensitivity Analysis Comparing Two Procedures for Adjusting As-Measured Spectra to Reference Conditions

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