• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Transportation Research Record >Measurement of Acoustical and Mechanical Properties of Porous Road Surfaces and Tire and Road Noise
【24h】

Measurement of Acoustical and Mechanical Properties of Porous Road Surfaces and Tire and Road Noise

机译：多孔路面的声学和力学性能以及轮胎和路面噪声的测量

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

The absorption coefficients of dense and porous road surfaces have been measured in the laboratory with core samples with 4- and 6-in.-diameter impedance tubes and with an impedance tube mounted vertically in situ on the pavement surfaces. The 6-in. tube allows the absorption of a large core sample surface to be determined, but only up to a frequency of about 1,250 Hz. The 4-in. tube allows the absorption coefficient to be determined up to a frequency of about 1,950 Hz. The two different-diameter impedance tubes also were mounted vertically on some of the same pavement types, and the absorption coefficients of these pavement types were measured in this way too. The measured peak sound absorption coefficients of the fine- and coarse-mix aggregate porous surfaces suggest that the first peak frequency and peak absorption coefficient magnitude are only slightly different for the two types of porous surfaces. Because the fine- mix aggregate porous surface is smoother, it is preferred because it should result in less tire-tread impact noise and thus lower overall tire noise than the coarse aggregate surface. A porous surface between 1.5 and 2.0 in. thick is recommended for the type of porous surface examined, if a peak absorption frequency of about 1,000 Hz is desired, so as to be most effective at reducing the Interstate highway noise of automobiles.
机译：在实验室中，通过使用直径为4英寸和6英寸的阻抗管以及垂直原位安装在路面上的阻抗管的岩心样品，测量了稠密和多孔路面的吸收系数。 6英寸试管可以测定大的岩心样品表面的吸收率，但只能达到大约1,250 Hz的频率。 4英寸管允许在高达1,950 Hz的频率下确定吸收系数。两个直径不同的阻抗管也垂直安装在某些相同的路面类型上，并且也以这种方式测量了这些路面类型的吸收系数。细混合料和粗混合料多孔表面的峰值吸声系数测量结果表明，对于两种类型的多孔表面，第一峰值频率和峰值吸收系数幅度仅稍有不同。因为精细混合的骨料多孔表面较光滑，所以它是优选的，因为与粗骨料表面相比，它应导致较少的轮胎胎面冲击噪声并因此降低总体轮胎噪声。如果希望峰值吸收频率约为1,000 Hz，建议对被检查的多孔表面类型使用1.5至2.0英寸厚的多孔表面，以最有效地降低汽车的州际公路噪声。

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