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The National Conference with international participation on New Cryogenic and Isotope Technologies for Energy and Environment - EnergEn 2018 is organized by the National Research-Development Institute for Cryogenic and Isotopic Technologies - ICSI Rm. Valcea with the scientific participation of the University of Pitesti and the University of Craiova and will be held at Baile Govora, in 2018.

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A THEORETICAL APPROACH OF THE EQUIVALENT SOURCES METHOD APPLIED TO NOISE BARRIERS

SEBASTIAN PÂRLAC1, CONSTANTIN ONESCU1, ION IORGA SIMĂN2,
IOAN ŞTEFĂNESCU3

1University of Piteşti, Department of Applied Mechanics, 110040, Piteşti, Romania,
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2University of Piteşti, Department of Physics, 110040, Piteşti, Romania, This e-mail address is being protected from spambots. You need JavaScript enabled to view it
3National Institute of Cryogenics & Isotopic Technologies, 240050 Rm.Valcea, Romania, istef@ icsi.ro


 ABSTRACT

The main contribution of noise levels in cities is today road traffic. The strongest source for all road vehicles is most often the tyre-road contact. This source position close to the ground is fortunate with respect to secondary noise abatement measures, such as absorbing road surfaces or noise barriers.
In this paper the equivalent sources method (ESM) is shown to be applicable to a noise barrier problem. The insertion loss can be significantly improved through optimization. To optimize a barrier’s insertion loss for a given height by modifying the boundary conditions is difficult with existing methods. By using the (ESM) such an optimization can be performed in a straight-forward manner. The amount of improvement depends on barrier geometry, the impedance of the surrounding ground and on the frequency.
Keywords: Traffic noise, noise barrier, insertion loss, optimization, equivalent sources method (ESM), boundary element method (BEM).