Assessing Community Annoyance of Helicopter Noise (2017) / Chapter Skim
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Pages 14-22
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From page 14... ...
14 2.1 Introduction The literature review contained in Appendix B, and described in Chapter 1, identified hypotheses about the absolute and relative annoyances of fixed- and rotary-wing aircraft and examined the published evidence in favor of and contrary to the various hypotheses. Much of the historical evidence about these hypotheses proved to be either contradictory or ambiguous.
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From page 15... ...
Development of Hypotheses 15 size requirements, methods for quantifying nonacoustic influences on annoyance, magnitudes of expected effects, site selection criteria, and content and method of questionnaire administration. 2.2 Factors Complicating Hypothesis Testing Both general and site-specific factors complicate hypothesis testing and interpretations of social survey findings.
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From page 16... ...
16 Assessing Community Annoyance of Helicopter Noise 2.3 Some General Constraints on Hypothesis Testing 2.3.1 Geographic Disparities Between Areas with High Helicopter Noise Exposure and Areas with Sufficiently Large Residential Populations Helicopter noise exposure levels are generally greatest in geographic areas near terminal operating areas and in close proximity to flight routes. Good land use and flight route planning tend to minimize residential populations in such areas.
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From page 17... ...
Development of Hypotheses 17 respondents.10 While the findings of this study will be analyzed in part with respect to a fixedshape dosage-response curve that translates laterally depending on local community tolerance to aircraft noise sources, it is highly desirable to verify the fixed-shape assumption within communities. A narrow exposure range can preclude this possibility.
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From page 18... ...
18 Assessing Community Annoyance of Helicopter Noise level measurements made at various sites within the interviewing area. Hence, the combined uncertainty in both measurements and modeling will be reflected in the computed doses.
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From page 19... ...
Development of Hypotheses 19 to interview, over which exposure estimates may be made from modeling of annual average day exposure. Hypothesis 1: Decibel for decibel, rotary-wing aircraft noise is more annoying than fixed-wing aircraft noise.
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From page 20... ...
20 Assessing Community Annoyance of Helicopter Noise Hypothesis 2: The prevalence of annoyance due to rotary-wing noise is most appropriately predicted in units of A-weighted cumulative exposure. No specific questionnaire items are required to test this hypothesis.
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From page 21... ...
Development of Hypotheses 21 Hypothesis 5: The prevalence of annoyance due to helicopter noise is heavily influenced by nonacoustic factors. The most direct test of this hypothesis would require soliciting annoyance judgments from respondents in two or more communities with very similar helicopter noise exposure but very different tolerances for helicopter noise.
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From page 22... ...
22 Assessing Community Annoyance of Helicopter Noise exposure levels in the immediate vicinity of the airport. Actual changes in the geographic distribution of complaints were closely contained in the vicinity of changes in flight paths associated with the runway opening.
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