ANALYSIS OF NOISE REDUCTION AND THE INFLUENCE OF WAVE’S DIFFRACTION ANGLE USING NOISE BARRIERS

Mihai BUGARU, Ovidiu VASILE, Marian NEAGOE

Abstract


The paper reveals the experimental research carried out, in the anechoic chamber at the department of mechanics of University POLITEHNICA of Bucharest, to high-lite the noise reduction (the acoustic attenuation) from the source (S) to the receiver (R), using different material layers for the noise barrier. The tests were performed on an experimental model having the dimensions 2mx1.5m, considering an incident wave angle of the source with respect to the receiver, having initially a diffraction angle of 00 (in the shadow field, orthogonal on the plane of the barrier), subsequently with a diffraction angle of ± 450 (angle of the receiver with respect to the direct straight angle of the source). The experimental results are presented as a function of the internal layers of the barrier’s structure as well as a function of the incident diffraction angle of the sound wave. The conclusion of the paper reveals the basic differences obtained by this experimental research.


Full Text:

PDF

References


CR 1-1-4:2012 - Design code. Evaluation of the wind action on constructions.

CR 1-1-3:2012 - Design code. Evaluation of the action of snow on constructions.

EN 14388:2016 – Specifications. Road traffic noise reducing devices.

Bratu, M., Bucur, E., Danciulescu, V., Petrescu, M., Gheorghita, T., Vasile, O. (2020), Assessment of the level of noise and

chemical air pollution in two distinct urban areas, http://Doi.Org/10.21698/Rjeec.2020.216

Karakitsios, S.P., Papaloukas, C.L., Kassomenos, P.A., Pilidis, G., Assessment and prediction of benzene concentrations in a street canyon using artificial neural networks and deterministic models: their response to “what if” scenarios, http://Doi.Org/ 10.1016/J.Ecolmodel.2005.07.024.

Sygna, K., Aasvang, G.M., Aamodt, G., Oftedal, B., Krog, N.H., Road traffic noise, sleep and mental health, http://Doi.Org/

1016/J.Envres.2014.02.010.

Begou, P., Kassomenos, P., Kelessis, A., Effects of road traffic noise on the prevalence of cardiovascular diseases: the case of Thessaloniki, Greece, http://Doi.Org/

1016/J.Scitotenv.2019.134477.

Tămaş-Gavrea, D.-R.; Dénes, T.-O.; Iştoan, R.; Tiuc, A.E.; Manea, D.L. Vasile, O., A novel acoustic sandwich panel based on

sheep wool, Coatings, http://Doi.Org/10.3390/ Coatings10020148.

Jin, Y., Fang, X., Li, Y, Torrent, D., Engineered diffraction gratings for acoustic cloaking, http://Doi.Org/10.1103/ Physrevapplied.11.011004.

Pirinchieva, R.K., The influence of barrier size on its sound diffraction, http://Doi.Org/10.1016/0022-60x(91)90570-A

Bugaru M., Enescu N., Stanila R., Vasile O., Reflection and absorption properties of the acoustical barriers of finite length, 12th

International Congress On Sound And Vibration 2005, Lisbon, Portugal, ICSV 2005, Volume 3, Pages 2143-2149, ISBN

-162748149-6,2005, Publisher: International Institute of Acoustics and Vibration, Lisbon.

Bugaru M., Dale R., Acoustic Properties Of Sound Barriers, Proceedings of The14th International Congress On Sound And

Vibration 2007, ICSV 2007, Volume 5, Pages 4244 - 4250, ISBN 978-162748000-0, Cairns, Australia Qld, 9 July 2007 - 12 July

, Publisher: International Institute of Acoustics and Vibration, Cairns.

Piechowicz, J., Sound wave diffraction at the edge of a sound barrier, http://Doi:10.12693/Aphyspola.119.1040

Vasile, O., Insertion loss analysis of the acoustic panels with composite construction, Analele Universităţii "Eftimie Murgu"

Reşiţa: Fascicola I, Inginerie, Anul Xx, No. 2, Pp. 85-91, ISSN 1453-7397, Resita, 2013.


Refbacks

  • There are currently no refbacks.


JOURNAL INDEXED IN :