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

Reherman, Clay N.; Roof, Christopher J.; Fleming, Gregg G.; Rickley, Edward J.; U.S. Department Of Transportation

ISBN 10: 1494956195 / ISBN 13: 9781494956196

Published by CreateSpace Independent Publishing Platform, 2002

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Bibliographic Details

• Title: A Sensitivity Analysis Comparing Two Procedures for Adjusting As-Measured Spectra to Reference Conditions
• Publisher: CreateSpace Independent Publishing Platform
• Publication Date: 2002
• Language: English
• ISBN 10: 1494956195
• ISBN 13: 9781494956196
• Binding: Soft cover
• Condition: New

About this title

Synopsis

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.