CONTRIBUTION OF DIFFUSER SURFACES TO EFFICIENCY OF TILTED T SHAPE PARALLEL HIGHWAY NOISE BARRIERS

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MONAZAM MOHAMMAD REZA; NASIRI PARVIN; JAVID ROUZI NILOFAR

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Journal: IRAN OCCUPATIONAL HEALTH JOURNAL Year:2009 | Volume:6 | Issue:1 Page(s): 44-55

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Title

CONTRIBUTION OF DIFFUSER SURFACES TO EFFICIENCY OF TILTED T SHAPE PARALLEL HIGHWAY NOISE BARRIERS

Author(s)

MONAZAM MOHAMMAD REZA | NASIRI PARVIN | JAVID ROUZI NILOFAR | Issue Writer Certificate

Keywords

TILTED PARALLEL NOISE BARRIERQ4

DIFFUSERSQ4

2D BOUNDARY ELEMENT METHODQ4

Abstract

Background and aims: The paper presents the results of an investigation on the acoustic performance of tilted profile parallel barriers with quadratic residue diffuser tops and faces.Methods: A 2D BOUNDARY ELEMENT METHOD (BEM) is used to predict the barrier insertion loss.The results of rigid and with absorptive coverage are also calculated for comparisons. Using QRD on the top surface and faces of all tilted profile parallel barrier models introduced here is found to improve the efficiency of barriers compared with rigid equivalent parallel barrier at the examined receiver positions.Results: Applying a QRD with frequency design of 400 Hz on 5 degrees tilted parallel barrier improves the overall performance of its equivalent rigid barrier by 1.8 dB (A). Increase the treated surfaces with reactive elements shifts the effective performance toward lower frequencies. It is found that by tilting the barriers from 0 to 10 degrees in parallel set up, the degradation effects in parallel barriers is reduced but the absorption effect of fibrous materials and also diffusivity of the quadratic residue diffuser is reduced significantly. In this case all the designed barriers have better performance with 10 degrees tilting in parallel set up.Conclusion: The most economic traffic noise parallel barrier, which produces significantly high performance, is achieved by covering the top surface of the barrier closed to the receiver by just a QRD with frequency design of 400 Hz and tilting angle of 10 degrees. The average A weighted insertion loss in this barrier is predicted to be 16.3 dB (A).

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APA: Copy

MONAZAM, MOHAMMAD REZA, NASIRI, PARVIN, & JAVID ROUZI, NILOFAR. (2009). CONTRIBUTION OF DIFFUSER SURFACES TO EFFICIENCY OF TILTED T SHAPE PARALLEL HIGHWAY NOISE BARRIERS. IRAN OCCUPATIONAL HEALTH JOURNAL, 6(1), 44-55. SID. https://sid.ir/paper/392794/en

Vancouver: Copy

MONAZAM MOHAMMAD REZA, NASIRI PARVIN, JAVID ROUZI NILOFAR. CONTRIBUTION OF DIFFUSER SURFACES TO EFFICIENCY OF TILTED T SHAPE PARALLEL HIGHWAY NOISE BARRIERS. IRAN OCCUPATIONAL HEALTH JOURNAL[Internet]. 2009;6(1):44-55. Available from: https://sid.ir/paper/392794/en

IEEE: Copy

MOHAMMAD REZA MONAZAM, PARVIN NASIRI, and NILOFAR JAVID ROUZI, “CONTRIBUTION OF DIFFUSER SURFACES TO EFFICIENCY OF TILTED T SHAPE PARALLEL HIGHWAY NOISE BARRIERS,” IRAN OCCUPATIONAL HEALTH JOURNAL, vol. 6, no. 1, pp. 44–55, 2009, [Online]. Available: https://sid.ir/paper/392794/en

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