Browse > Article
http://dx.doi.org/10.5050/KSNVN.2005.15.8.891

Actively Controlled Sound Field of Upper Sections Attached to Noise Barriers  

Koh, Hyo-In (한국철도기술연구원)
Lee, Chan-Woo (한국철도기술연구원)
Publication Information
Transactions of the Korean Society for Noise and Vibration Engineering / v.15, no.8, 2005 , pp. 891-896 More about this Journal
Abstract
On the basis of theoretical studies on the effect of the cylinders attached to semi-infinite screens, the tangential sound power-transport parallel to the surface of the attached cylinder is minimized by means of a secondary sound field, which is generated from a part of the attached cylinder. The numerical study shows the possibility of deflecting the incident sound by minimizing the sound field of the upper sections. The acoustical shadow region was more pronounced in both near- and far-field compared to the passive case with rigid surface, i.e. without active control. For a relatively wide frequency range it was possible to enhance shielding effects only with few secondary sources and error microphones. In this paper effects of control parameters on the actively controlled sound field near the top edge of noise barriers are studied. Results of numerical study and model measurements are shown and discussed.
Keywords
Active Noise Control; Noise Barrier;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Koh, H., 2004, Aktiv Verbesserte Aufstze fur Schallschutzwande, PhD Thesis
2 Koh, H. and Moser, M., 2004, Efficiency of Actively Controlled Surface Impedance of Headpieces Attached to Noise Barriers, ' Building Acoustics', Vol.11, Nr. 2, pp.115-131   DOI   ScienceOn
3 강대준, 이재원, 박준철, 2004, '고속철도소음 현황과 특성', 한국소음진동공학회논문집, 제 14권, 제 11 호, pp. 1161 - 1165
4 Moser, M., 1995, The Effect of Cylinders Attached to Acoustic Screens, Acustica 81, 565- 586
5 Guo, J. and Pan, J.. 1998, 'Increasing the Insertion Loss of Noise Barrier Using an ActiveControl System,' J. Acoust. Soc. Am. 104(6), 3408 -3416   DOI   ScienceOn
6 Ornoto, A. and Fujiwara, K., 1993, 'A Study of an Actively Controlled Noise Barrier', J. Acoust. Soc. Am 94(4), 2173-2180   DOI   ScienceOn
7 Ohnishi, K., Nishimura, M., Uesaka, K and Ohnishi, H., 1993, Development of the Noise Barrier using Active Controlled Acoustic Soft Edge- Part 2: Coexist with Active and Passive Performance-, Proc. of the 1000 Spring Meeting of the Acoustical Society of Japan, 693-694