Sound Diffraction Over Noise Barriers with Added Devices Installed on the Top Edge

• Authors: J. Piechowicz
• Languages of publication: EN

Abstracts

EN

Airborne sound insulation index of the noise barrier panel and the sound absorption coefficient of the barrier surface are the acoustic parameters that are usually determined in specialized laboratories, however they can be also determined in situ. Acoustic characteristics of a barrier include also the diffraction index difference determined from comparison of barriers with plain top edges and barriers with added devices installed on the top edge. The index is determined from the impulse response values determined for the acoustic wave propagation path from the sound source to a set of properly distributed measurement points. By means of the same method, one can also determine the difference in a barrier's acoustic effectiveness between the plain top barrier structure and its version with added devices mounted on the top. The paper presents measurement results for three types of added devices mounted on the top edge of the barrier. The diffraction index differences have been determined for each added device type and the acoustic effectiveness for each device has been compared with the plain top edge acoustic barrier.

Keywords

EN

43.20.El; 43.20.Fn; 43.50.Gf; 43.50.Yw; 43.60.Ek; 43.55.Rg

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 128
• Issue: 1A
• Pages: A-36-A-40

Dates

published

2015-07

Contributors

author

J. Piechowicz

• AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krakow, Poland

References

• [1] J. Kompała, J. Martyka, M. Majer, Proceedings 7th Forum Acusticum 2014 Krakow, FA2014, Krakow 2014 http://fa2014.agh.edu.pl/fa2014_cd/article/RS/R13L_4.pdf
• [2] J. Piechowicz, Acta Phys. Pol. A 119, 1040 (2011) http://przyrbwn.icm.edu.pl/APP/PDF/119/a119z6Ap29.pdf
• [3] J. Piechowicz, Mech. and Control 29, 179 (2010)
• [4] D.J. Oldham, Ch.A. Egan, Appl. Acoust. 72, 803 (2011), doi: 10.1016/j.apacoust.2011.04.012
• [5] S. Sakamoto, H. Tachibana, Proceedings 18th ICA, Kyoto 2004, p. 525
• [6] S. Weyna, Proceedings 1st Seminar Environmental Protection against Noise 2013 Krakow, Department of Mechanics and Vibroacoustics, Kraków 2013 (in Polish), p. 41
• [7] M. Garai, P. Guidorzi, Proceedings Acoustics 2008, Paris 2008 http://webistem.com/acoustics2008/acoustics2008/cd1/data/articles/000608.pdf
• [8] M. Garai, P. Guidorzi, J Acoust. Soc. Am. 108, 1054 (2000)
• [9] G.R. Watts, P.A. Morgan, M. Surgand, J Sound Vib. 274, 669 (2004), doi: 10.1016/j.jsv.2003.05.005
• [10] M. Karimi, D. Younesian, J Low Freq. Noise V A 33, 357 (2014), doi: 10.1260/0263-0923.33.3.357
• [11] Z. Engel, J. Piechowicz, L. Stryczniewicz, Fundamentals of industrial vibroacoustics, AGH, Kraków 2003 (in Polish)
• [12] A. Ozga, Acta Phys. Pol. A 123, 1034 (2013), doi: 10.12693/APhysPolA.123.1034
• [13] M. Jabłoński, A. Ozga, Distribution of random pulses acting on a vibrating system as a function of its motion, AGH University of Science and Technology Press, Kraków 2013
• [14] J.B. Keller, J Opt. Soc. Am. 62, 116 (1962)
• [15] DS./CEN/TS 1793-4; Road traffic noise reducing devices - Test method for determining the acoustic performance - Part 4: Intrinsic characteristics - In situ values of sound diffraction
• [16] PN-EN 1793-3:2001 Road traffic noise reducing devices. Test method for determining the acoustic performance. Normalized traffic noise spectrum

Identifiers

DOI

10.12693/APhysPolA.128.A-36