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Weather-Dependent Airport Noise Contour Prediction Concept Based on Ray Tracing

机译：基于光线跟踪的天气相关机场噪声轮廓预测概念

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摘要

The most frequently used excess attenuation method for noise contour models is called the lateral attenuation correction. This empirical method disregards varying atmospheric conditions. It is known that varying atmospheric conditions can lead to large discrepancies for single-event cases. This paper studies these atmospheric effects for a longer period, thus involving multi-event calculations. A European Civil Aviation Conference Document 29 compliant noise model is used with the extended functionality to apply results from a ray-tracing excess attenuation calculation. Results are shown for monthly and yearly noise contours around an example airport using three different modeling options: the standard Document 29 methodology, the standard methodology augmented by varying atmospheric absorption, and the ray-tracing excess attenuation method. The differences found in excess attenuation between the standard Document 29 method and ray tracing are small. It is argued that the main differences are related to varying atmospheric absorption and ground attenuation. For the case considered, wind effects are of minor importance when modeling monthly or yearly contours. In conclusion, the empirical lateral attenuation model, used to estimate the average excess attenuation in a varying atmosphere, provides a practical and realistic estimate for yearly and monthly noise contours for the used atmosphere.
机译：用于噪声轮廓模型的最常用的过度衰减方法称为横向衰减校正。这种经验方法忽略了变化的大气条件。众所周知，变化的大气条件可能导致单事件情况的较大差异。本文将对这些大气影响进行更长时间的研究，从而涉及多事件计算。符合欧洲民航会议文档29的噪声模型与扩展功能一起使用，以应用光线跟踪多余衰减计算的结果。显示了使用三个不同的建模选项在一个示例机场周围的每月和每年噪声等值线的结果：标准的Document 29方法，通过改变大气吸收率而增强的标准方法以及光线追踪过量衰减方法。标准Document 29方法与射线跟踪之间的过度衰减之间的差异很小。有人认为，主要区别与大气吸收和地面衰减的变化有关。对于所考虑的情况，在对每月或每年的轮廓进行建模时，风效应的重要性较小。总之，经验侧向衰减模型用于估计变化的大气中的平均过量衰减，为所用大气的年和月噪声等值线提供了实用和现实的估计。

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  • 来源
    《Journal of Aircraft》 |2014年第5期|1351-1359|共9页
  • 作者

    Arntzen Michael; Heblij Sander J.; Simons Dick G.;

  • 作者单位

    Natl Aerosp Lab, NL-1059 CM Amsterdam, Netherlands;

    Natl Aerosp Lab, NL-1059 CM Amsterdam, Netherlands;

    Delft Univ Technol, NL-2629 HS Delft, Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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