Assessing Community Annoyance of Helicopter Noise (2017) / Chapter Skim
Currently Skimming:
Pages 115-127
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 115... ...
115 The entries in the following bibliography are not intended to be comprehensive but rather to summarize interpretations of findings of some of the better-known studies of the annoyance of helicopter noise. They exclude studies intended mostly to measure helicopter noise emissions, and some laboratory studies of rotor noise whose findings have little direct bearing on the design of social surveys of the annoyance of helicopter noise.
|
From page 116... ...
116 Assessing Community Annoyance of Helicopter Noise Edwards, B
|
From page 117... ...
Annotated Bibliography 117 the range of fundamental and harmonics of blade passage rates of present interest) the audibility of impulse wavetrains is very closely predictable from the audibility of a single impulse.
|
From page 118... ...
118 Assessing Community Annoyance of Helicopter Noise doubling of repetition rate (or 5 dB/decade) indicates that greater signal energy is needed at increasing repetition rates to maintain constant detection performance, and that these slopes are effectively independent of observation interval duration over the investigated range.
|
From page 119... ...
Annotated Bibliography 119 nonetheless "triggered by the direct acoustic signal." As Leverton puts it, "Virtual noise is dependent on a wide range of inputs but is triggered initially by any distinctive feature of the acoustic signature and, to a far lesser extent, the absolute noise level." In other words, adverse community reaction to helicopter noise is conditioned on two sets of factors other than the conventionally measured, A-weighted acoustic energy of helicopter noise emissions. The first component of virtual noise is the noticeability of distinctive features of helicopter noise emissions, such as HSI, tail rotor (TR)
|
From page 120... ...
120 Assessing Community Annoyance of Helicopter Noise sources, on the other hand, heavily penalized tonal components of helicopter noise, such as those produced by Sud Aviation's (subsequently Aérospatiale, Eurocopter, and now Airbus Helicopters) high-speed, ducted fan ("Fenestron")
|
From page 121... ...
Annotated Bibliography 121 Munch, C
|
From page 122... ...
122 Assessing Community Annoyance of Helicopter Noise Ollerhead, J
|
From page 123... ...
Annotated Bibliography 123 coefficients for these metrics (0.81)
|
From page 124... ...
124 Assessing Community Annoyance of Helicopter Noise aircraft flybys. After noting the "very diverse" character of helicopter noise, Powell comments on the inconclusiveness of studies intended to ascertain whether an impulsiveness correction is useful for predicting the noisiness of helicopter noise.
|
From page 125... ...
Annotated Bibliography 125 Schomer, P., and Wagner, L
|
From page 126... ...
126 Assessing Community Annoyance of Helicopter Noise Sternfeld, H., Spencer, R., and Ziegenbein, P
|
From page 127... ...
Annotated Bibliography 127 • The methods proposed [by ICAO in the late 1970s] to objectively compute a blade slap correction factor do not appear to agree consistently with the correction factors measured subjectively to account for annoyance of blade slap.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.