Record Details

Record 1 of 1
Subjective field study of response to impulsive helicopter noise
NTRS Full-Text: Click to View  [PDF Size: 1.8 MB]
Author and Affiliation:
Powell, C. A.(NASA Langley Research Center, Hampton, VA, United States)
Abstract: Subjects, located outdoors and indoors, judged the noisiness and other subjective noise characteristics of flyovers of two helicopters and a propeller driven airplane as part of a study of the effects of impulsiveness on the subjective response to helicopter noise. In the first experiment, the impulsive characteristics of one helicopter was controlled by varying the main rotor speed while maintaining a constant airspeed in level flight. The second experiment which utilized only the helicopters, included descent and level flight operations. The more impulsive helicopter was consistently judged less noisy than the less impulsive helicopter at equal effective perceived noise levels (EPNL). The ability of EPNL to predict noisiness was not improved by the addition of either of two proposed impulse corrections. A subjective measure of impulsiveness, however, which was not significantly related to the proposed impulse corrections, was found to improve the predictive ability of EPNL.
Publication Date: Apr 01, 1981
Document ID:
19810013343
(Acquired Nov 14, 1995)
Accession Number: 81N21873
Subject Category: ACOUSTICS
Report/Patent Number: NASA-TP-1833, L-14205
Document Type: Technical Report
Publisher Information: United States
Contract/Grant/Task Num: RTOP 505-35-13-01
Financial Sponsor: NASA; United States
Organization Source: NASA Langley Research Center; Hampton, VA, United States
Description: 43p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: AIRCRAFT NOISE; EFFECTIVE PERCEIVED NOISE LEVELS; HELICOPTERS; NOISE PREDICTION (AIRCRAFT); PSYCHOACOUSTICS; DATA ACQUISITION; IMPULSES; REGRESSION ANALYSIS; ROTARY WINGS; ROTOR SPEED; TABLES (DATA)
› Back to Top
Facebook icon, External Link to NASA STI page on Facebook Twitter icon, External Link to NASA STI on Twitter YouTube icon, External Link to NASA STI Channel on YouTube RSS icon, External Link to New NASA STI RSS Feed
Find Similar Records
 
NASA Logo, External Link

NASA Official: Gerald Steeman

Sponsored By: NASA Scientific and Technical Information Program

Site Curator: STI Support Services

Last Modified: August 29, 2013

Privacy Policy & Important Notices Disclaimers, Copyright, Terms of Use Freedom of Information Act USA.gov NASA.gov NASA OCIO Free Adobe PDF Reader Free MS Word Viewer