Technology for a Quieter America (2010) / Chapter Skim
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3 Metrics for Assessing Environmental Noise
3 Metrics for Assessing Environmental Noise
Pages 19-30
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From page 19... ...
The metric • to assess a noise situation in terms of noise control chosen or developed for measuring community noise must engineering reflect this human response and must be taken into account in making policy decisions. The metrics to accomplish these purposes may differ, but all Fifty years ago, when noise metrics were developed, the three relate directly to the impact of noise on the community.
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From page 20... ...
In cal factors as well as noise levels and yielded a "composite modern terms the unit of loudness is the phon. For example, noise rating." This rating was then plotted against a scale of a 1,000-Hz tone with a sound pressure level of 40 dB has a community responses -- vigorous community action, threats loudness of 40 phon.
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in current sound level meter specifications, has been widely In some countries, Lday and Lnight, (average A-weighted used for transportation and community noise description. sound pressure levels)
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Percentage of Persons Highly Annoyed Consultants and other professionals are often asked to The next major event in the selection of a noise metric study community noise issues and recommend remedial was a study by Schultz (1978) of surveys of community action.
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From page 23... ...
, sleep disturbance ing showed that the 707 was considered much noisier; by is related to the nighttime level designated as Lnight, although subjective measures, the A-weighted sound pressure levels researchers also use indoor LAmax and indoor A-weighted of the 707 would have to be significantly reduced to be con- sound exposure level (ASEL) when investigating the relasidered as noisy as the Super Constellation.
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published The Green Paper, which established new noise programs that are used to Neither day-night average sound level nor percent highly address noise issues today (EC, 1996)
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Based in the 2002 END that led to noise mapping. The directive on questionnaires, curves similar to Schultz curves were also suggests supplemental metrics based on the WG1 report developed, the ordinate being the percent highly disturbed (EC, 2002a)
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that can Air traffic Road traffic Rail traffic influence annoyance and sleep disturbance levels.
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1. The international noise control engineering community A set of metrics, rather than a single metric, to describe should develop an open, collaborative data-sharing different types of outcomes of environmental noise (e.g., environment in which researchers can deposit and number of interruptions of speech, learning impairment in access data from community noise surveys (e.g., data schools, number of additional awakenings)
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From page 28... ...
Journal of the Acoustical Society of Supplemental Noise Metrics in Aircraft Noise Analyses. Available online America 35:866–883.
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Aircraft Noise, 8th ed. Available online at http://www.tc.gc.ca/ Road Traffic, Railway and Aircraft Noises in Kyushu and Hokkaido, CiilAiation/publications/TP47/Part4/Part4-.htm.
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