Author: Sherman A. ClevensonPublisher:
ISBN:
Category :
Languages : en
Pages : 24
Book Description
Effect of Helicopter Noise on Passenger Annoyance
Effect of Noise Spectra and a Listening Task Upon Passenger Annoyance in a Helicopter Interior Noise Environment
Author: Sherman A. ClevensonPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 32
Book Description
A laboratory study was conducted to determine the effects of helicopter interior noise on passenger annoyance. Bothe reverie and listening situations were studied as well as the relative effectiveness of several descriptors (i.e., overall sound pressure level, A-weighted sound pressure level, and speech interference level) for quantifying annoyance response for these situations. The noise stimuli were based upon recordings of the interior noise of the NASA Civil Helicopter Research Aircraft. These noises were presented at levels ranging from approximately 68 to 86 dB(A) with various gear clash tones selectively attenuated to give a range of spectra. The listening tasks required the subjects to listen to and record phonetically balanced words presented within the various noise environments. Results indicate that annoyance during a listening condition is generally higher than annoyance during a reverie condition for corresponding interior noise environments. Attenuation of the planetary gear clash tone results in increases in listening performance but has negligible effect upon annoyance for a given noise level. The noise descriptor most effective for estimating annoyance response under conditions of reverie and listening situations is shown to be the A-weighted sound pressure level. (Author).
Effect of Noise Spectra and a Listening Task Upon Passenger Annoyance in a Helicopter Interior Noise Environment
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781725053175
Category :
Languages : en
Pages : 32
Book Description
The effects of helicopter interior noise on passenger annoyance were studied. Both reverie and listening situations were studied as well as the relative effectiveness of several descriptors (i.e., overall sound pressure level, A-weighted sound pressure level, and speech interference level) for quantifying annoyance response for these situations. The noise stimuli were based upon recordings of the interior noise of a civil helicopter research aircraft. These noises were presented at levels ranging from approximately 68 to 86 dB(A) with various gear clash tones selectively attenuated to give a range of spectra. Results indicated that annoyance during a listening condition is generally higher than annoyance during a reverie condition for corresponding interior noise environments. Attenuation of the planetary gear clash tone results in increases in listening performance but has negligible effect upon annoyance for a given noise level. The noise descriptor most effective for estimating annoyance response under conditions of reverie and listening situations is shown to be the A-weighted sound pressure level. Clevenson, S. A. and Leatherwood, J. D. Langley Research Center NASA-TP-1590, L-13233 RTOP 505-09-13-11...
Effects of Conversation Interference on Annoyance Due to Aircraft Noise
Author: Kelli Francisco KeyPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 44
Book Description
NASA Technical Paper
Author: Assessing Community Annoyance of Helicopter Noise
Author: Vincent MestrePublisher:
ISBN: 9780309446631
Category : Airplanes
Languages : en
Pages : 135
Book Description
"This report explores what is currently known about community annoyance of helicopter noise. It describes a protocol for conducting a large-scale community survey to quantify annoyance due to civil helicopter noise and presents the results of a test of the protocol which also helped improve understanding of the roles of acoustic and non-acoustic factors that influence community annoyance to civil helicopter noise. The report should be of particular interest to airport industry practitioners, community planners, and researchers who desire a better understanding of the factors affecting community annoyance with helicopter noise and possible differences between helicopter noise impacts and fixed-wing aircraft noise impacts."--Publisher.
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1282
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Aeroacoustics of Flight Vehicles: Noise control
Author: Harvey H. HubbardPublisher:
ISBN:
Category : Aerodynamic noise
Languages : en
Pages : 452
Book Description
Author: 
Author: