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Scale model experiments on noise reduction by acoustic barrier of a straight line source

✍ Scribed by Masaru Koyasu; Mitsuyasu Yamashita

Publisher: Elsevier Science
Year: 1973
Tongue: English
Weight: 361 KB
Volume: 6
Category: Article
ISSN: 0003-682X
DOI: 10.1016/0003-682x(73)90015-7

No coin nor oath required. For personal study only.

✦ Synopsis

Noise reduction by an acoustic barrier of a straight line source is examined with the aid of scale model experiments. The line source used in these experiments is an incoherent line source mechanically radiating broad band noise. From the experimental results a curve can be deduced which shows a relation between sound attenuation and Fresnel number N. This curve shows vahles lower than those of Maekawa's data by 3 ,,~ 5 dB, which are presented for a point source. On the other hand, it agrees fairly well with Rathe's experimental results, measured near the tracks of a railway line, and also shows a similar tendency to the curve calculated by Kttrze and Anderson for an incoherent line source.

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Model measurements on noise screening of line sources by single and double barriers

✍ W. Porada 📂 Article 📅 1975 🏛 Elsevier Science 🌐 English ⚖ 412 KB

Experiments on the noise-reduction achieved by acoustical barriers have been carried out on a scale model for a straight line source. The latter consisted of incoherent source elements, consisting of small air jets. For the attenuation by a single barrier the simple function AL = -(10 + 6 log N) dB