Noise assessment of expansion joints built perpendicularly and angled in the direction of traffic. Measurement method: Case study

IF 3.4 2区 物理与天体物理 Q1 ACOUSTICS
Rafał Żuchowski, Artur Nowoświat, Michał Marchacz, Marcin Górski
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引用次数: 0

Abstract

Although expansion joints are an essential element of bridge infrastructure, they cause huge noise problems. Expansion joints can be structured differently whilst also being able to be installed differently. This article presents a case study on expansion joints installed perpendicularly and at an angle to the direction of traffic. It appears that the installation method affects the overall level of sound produced. Differences between diagonal and perpendicular constructions in the direction of traffic reach up to 2.9 dB. This value approximately corresponds to a doubling of the level of noise. The paper also presents a Type B uncertainty assessment for a Class I acoustic metre. The separation of upper and lower bounds of uncertainty is a particularly interesting result. In doing so, it was noted that the interval in which the true value of the measurement is located is asymmetrical. In the case of a type B uncertainty analysis, an upper limit on the expanded uncertainty of UB,95+=1.12dB and a lower limit of UB,95-=-1.22dB.
垂直与交通方向成斜角的伸缩缝噪声评价。测量方法:案例研究
伸缩缝是桥梁基础设施的重要组成部分,但同时也造成了巨大的噪声问题。伸缩节可以有不同的结构,同时也可以以不同的方式安装。本文介绍了垂直安装并与交通方向成一定角度的伸缩缝的实例研究。似乎安装方法会影响产生的声音的整体水平。在交通方向上,对角线和垂直结构之间的差异可达2.9 dB。这个值大约相当于噪声水平的两倍。本文还介绍了一类声学仪表的B类不确定度评估。不确定性上界和下界的分离是一个特别有趣的结果。在这样做时,注意到测量的真实值所在的间隔是不对称的。对于B类不确定度分析,UB的扩展不确定度上限为95+=1.12dB, UB的下限为95-=-1.22 db。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Applied Acoustics
Applied Acoustics 物理-声学
CiteScore
7.40
自引率
11.80%
发文量
618
审稿时长
7.5 months
期刊介绍: Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense. Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems. Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.
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