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Champaign, IL, United States

Wu K.,Zhejiang Research and Design Institute of Environmental Protection | Zhang J.,Zhejiang Research and Design Institute of Environmental Protection | Schomer P.D.,Schomer and Associates Inc. | Cui Y.,Hangzhou Subway Group Ltd | And 2 more authors.
40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011 | Year: 2011

In accordance with the environmental quality standard, the noise (immission) from subway ventilation device on buildings such as shafts, or air conditioning cooling towers, or both together, must meet the environmental noise standard both at the boundaries of adjoining properties and in noise sensitive areas that may be beyond the boundaries. In Hangzhou, the rules designating compatible land use, in accordance with the Environmental Noise Standard, are very stringent for urban areas and depart from the practice in other cities. The standard is that "the environmental impact of fixed noise sources along both sides of main roads in the area shall be assessed based upon the standards of adjacent sensitive areas." In this paper, the authors try to show from an academic viewpoint that if the background noise at the prediction positions along the main roads above the subway (road noise L90 or L95) exceeds the threshold for a class-2 zone, then it is only necessary to limit the noise at the boundaries of the ventilation shafts and cooling towers to the emission standards so that there is no deterioration of the acoustic environment at the sensitive points.

Schomera P.,Schomer and Associates Inc. | Brown A.L.,Griffith University | De Coensel B.,Ghent University | Genuit K.,HEAD acoustics GmbH | And 6 more authors.
39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010 | Year: 2010

As new fields of research grow, they develop their own purposes, lexicon, methods, metrics, criteria, etc. Early in the research it is common to standardize lexicon, methods, and concepts for the purpose of shared comprehension of these. Lexicon and concepts are usually the first items to be standardized. International Organization for Standardization Technical Committee 43/Sub-Committee 1/Working Group 54 has begun an effort to develop soundscape standards. This paper reports on efforts to standardize a graphical description of the soundscape concept. This graphical description is still evolving and currently includes the key elements to the soundscape concept.

Schomer P.,Schomer and Associates Inc.
The Journal of the Acoustical Society of America | Year: 2012

Fidell et al. [(2011), J. Acoust. Soc. Am. 130(2), 791-806] have shown (1) that the rate of growth of annoyance with noise exposure reported in attitudinal surveys of the annoyance of aircraft noise closely resembles the exponential rate of change of loudness with sound level, and (2) that the proportion of a community highly annoyed and the variability in annoyance prevalence rates in communities are well accounted for by a simple model with a single free parameter: a community tolerance level (abbreviated CTL, and represented symbolically in mathematical expressions as L(ct)), expressed in units of DNL. The current study applies the same modeling approach to predicting the prevalence of annoyance of road traffic and rail noise. The prevalence of noise-induced annoyance of all forms of transportation noise is well accounted for by a simple, loudness-like exponential function with community-specific offsets. The model fits all of the road traffic findings well, but the prevalence of annoyance due to rail noise is more accurately predicted separately for interviewing sites with and without high levels of vibration and/or rattle.

Newman P.,Colorado State University | Lawson S.,Resource Systems Group | Fristrup K.,National Park Service | Schomer P.,Schomer and Associates Inc.
39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010 | Year: 2010

Research has shown visitors to national parks can potentially impact park resources by trampling fragile vegetation, compacting and eroding soils, polluting water and disturbing wildlife. Acoustical impacts are also prevalent in national parks. The transportation systems that bring visitors to parks, visitor activities in parks, maintenance and infrastructure to support park visitation all project noise into park environments. Natural sounds and quiet backgrounds for hearing them are increasingly scarce resources. This paper will report on a program of research to address relationships between visitor access to parks and noise.

Hessler Jr. G.F.,Hessler Associates Inc. | Schomer P.D.,Schomer and Associates Inc.
Acoustics Australia | Year: 2012

Determining noise emissions attributable solely to wind turbine/s at potentially sensitive receptor locations far from the turbines is a technical challenge indeed. If the project is successfully designed acoustically, the wind turbine source is barely audible during the day or night with relatively moderate winds and not distinguishable at all during high winds. We must try to separate wind turbine emissions from the prevailing background environment and from sounds created by the same wind that drives the turbines. This paper suggests a methodology that measures surrounding turbine emissions simultaneously at the standard IEC-61400-11 distance to document background-free emissions for input into a relatively simple propagation model to calculate true turbine emissions at the distant receptor location of interest. An example is given from an actual site where turbine noise emissions could be accurately measured at the receptor location for comparison to model calculations.

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