PARAMETERS AFFECTING THE OUTDOOR NOISE BARRIERS EFFECTIVENESS - SIMULATION WITH SOUNDPLAN

Marius JOLDEA, Iulian LUPEA

Abstract


Abstract: The article presents design principles of sound barriers and an assessment of the acoustic parameters that can influence their efficiency. It was studied how the acoustic absorption coefficients of the noise barriers coupled with the noise emission characteristics of the noise sources influence the values of the noise level at the receiver. For this, with the help of the SoundPlan software package, it has been shown that for noise sources with the same acoustic power values and sound barriers of the same size, the values of the sound pressure level at the receiver location differ significantly depending on the spectral characteristics of the acoustic emission and by the sound absorption coefficients of the sound barriers. It has been shown that the sound absorption evaluation index - DLα - of sound barriers does not always reflect the actual performance of the sound barriers, there being situations where, for industrial noise sources, a sound barrier having DLα = 8 dB will lead, at the receiver point, to lower values of the sound pressure level than a barrier with a higher value of this index - DLα = 10 dB. As soon as the DLα index is given for the normalized traffic noise spectrum, not for industrial noise spectra, it’s obvious that for industrial noise sources, a different approach must be used, which takes into account the sound absorption coefficients of the barrier, in the 1/1 or 1/3 octave band instead of DLα index.

Keywords: noise barrier, insertion loss, transmission loss, sound absorption spectrum, barrier simulation, sound source emission spectrum.


Full Text:

PDF

References


Barron R., Industrial noise control and acoustics, 2003

Bratu, P., Acustică interioară pentru construcţii de maşini, Editura Impuls, 2002.

Clairbois,J-P., Garai, M., Noise barriers and standards for mitigating noise, CEDR Conf., Hamburg, Sept. 2015

Garai,M., Guidorzi,P., European methodology for testing the airborne sound insulation characteristics of noise barriers in situ: experimental., 2000.

Kotzen, B., English, C., Environmental Noise Barriers - A guide to their acoustic and visual design, Spon Press, 2009.

Kurze, U.J, Anderson, G.S., ‘Sound attenuation by barriers’, App.Ac., 4, 1971.

Lupea, I., Stremţan, Florina-Anca, Considerations on the acoustic panel absorber, ATN, AMM, Vol.56, Issue II, 2013

Lupea,I., Vibration and noise measurement by using Labview programming, Casa Cărţii de Ştiinţă, Cluj-Napoca, 2005,

Lupea, I., Considerations on the outdoors noise barriers design and simulation, Acta Technica Napocensis, Series: AMM, Vol.59, Issue III, 2017

Maekawa, Z. 1968. Noise reduction by screens. Appl. Acoust. 1: 157–173.

Stremtan, Florina-Anca, Garai, M., Lupea, I., Micro-perforated panels and sound

absorption, Acta Technica Napocensis, Series: AMM, Issue. III, Vol. 55, 2012.

Tatge, R., Barrier wall atenuation with a finite sized source, Journal of Acoustical Soc. of America, vol.53, p1317, 1973.

** https://www.fhwa. dot. gov/Environment/ noise/ noise_barriers/

** SoundPlan, User's Manual, 2018

**ISO 9613 /1,/2 – 2008 Acoustics - Attenuation of sound during propagation outdoors.

**ISO 1996 1/2 – 2017 Acoustics - Description, measurement and assessment of environmental noise.


Refbacks

  • There are currently no refbacks.


JOURNAL INDEXED IN :