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Subjective annoyance caused by indoor low-level and low frequency noise and control method

Journal of Environmental Sciences 2005年第1期17卷 135-140页

作者： diguo-qing ZHANGBang-jun SHANGQi DepartmentofEnvironmentalScience ZhejiangUniversityHangzhou310028China

The influence of low_level noise has not been widely noticed. This paper discovered that low_level and low frequency noise(A_weighted equivalent level L eq <45 dB) causes higher probability of subjective annoyance. The fuzzy mathematic principle was applied to deal with the threshold level of subjective annoyance from noise in this study; there is preferable relationship between the indoor noise and noise annoyance at low frequency noise level. Study indicated at the same centered noise level, the change of annoyance probability is mainly caused by the change of the frequency spectrum characteristic of the indoor noise. Under low noise level environment, without change of the medium_low frequency noise, the slight increase of medium_high frequency noise level with the help of noise sheltering effect can significantly reduce the noise annoyance. This discovery brings a new resolution on how to improve the environmental quality of working or living places. A noise control model is given in this study according to the acoustic analysis.

关键词： low-level noise subjective annoyance threshold level structural noise indoor noise noise control

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A new approach of drawing airport noise contours on computer based on Surfer

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Journal of Environmental Sciences 2004年第4期16卷 576-580页

作者： ZHANGBang-jun GUOChun-yan diguo-qing epartmentofEnvironmentalScience ZhejiangUniversityHangzhou310028China TheRadiationMonitoringTechnicalCenter SEPAHangzhou310012China

Noise contours are used to describe the extent of airport noise pollution and to plan land use around airports. The L WECPN(weighted equivalent continuous perceive noise level) recommended by ICAO(International Civil Aviation Organization) is adopted as airport noise rating parameter in this paper. With the help of various mathematical models in the software Surfer, noise contours can be drawn automatically by the completed program in Visual C++ Code. Corrections for thrust, velocity, atmospheric temperature, humidity and lateral ground attenuation are also considered in the new method, which can improve the efficiency of drawing contours. An example of its use for drawing noise contours of an airport in Zhejiang Province of China is proposed and the predictions and the measurements show agreements well.

关键词： airport noise contours weighted equivalent continuous perceive noise level(L WECPN) Surfer

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