...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Acustica >A Rating Index for Estimating Insertion Loss of Noise Barriers undei Traffic Noise Conditions
【24h】

A Rating Index for Estimating Insertion Loss of Noise Barriers undei Traffic Noise Conditions

机译：估计无声交通噪声条件下的声屏障插入损耗的评定指标

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Starting from the algorithms based in the geometrical theory of diffraction -GTD- most widely used to predict theInsertion Loss (IL) of an acoustic noise barrier, a simple analytical expression is proposed for the calculation of adescriptor index (expressed in A-weighted dB), which uniquely correlates the protection charateristics of the barrierwith the geometrical parameters of the source in relation to the barrier.From the six implicit parameters involved in the Fresnel number, related to the GTD algorithms, the proposed index isa function only of those corresponding to the source semispace (source height and source-barrierdistance). If an international agreement can be obtained for the source position in respect to the barrier (as occurs with the standardized measuring procedure for the evaluation of the noise emitted by vehicles), the proposed single rating indexwill only depend on the relative source height. In such a way, the IL characteristics of a barrier expressed in A-weighteddB, can be uniquely obtained through this quantity. The index proposed in this report, ILAW, gives the protection caused by a screen at far reception distances, expressed in A-weight dB for predetermined emission conditions (traffic noise spectrum, and distances normalized to A/2). It is shown that ILAW values can be obtained at distance close to the barrier under predefined error limits, or under the conditon of zero source-barrierdistance.
机译：从基于衍射几何理论的算法-GTD-最广泛地用于预测声屏障的插入损耗（IL）开始，提出了一个简单的解析表达式用于计算指标指数（以A加权dB表示） ，将障碍物的保护特性与与障碍物有关的源的几何参数唯一地关联起来。从与GTD算法有关的菲涅尔数涉及的六个隐式参数中，所提出的索引仅是对应于障碍物的那些参数的函数。源半空间（源高度和源屏障距离）。如果可以就障碍物的源头位置达成国际协议（如评估车辆发出的噪声的标准化测量程序中所发生的情况），则建议的单个等级指数将仅取决于相对源头高度。这样，通过该量可以唯一获得以A加权dB表示的屏障的IL特性。本报告中提出的索引ILAW提供了在远距离接收时由屏幕引起的保护，对于预定的发射条件（交通噪声频谱，距离归一化为A / 2），以A权重dB表示。结果表明，ILAW值可以在预定义的误差极限下或在零源-栅栏距离的条件下，在接近栅栏的距离处获得。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号