TY - JOUR N2 - Acoustic barriers which are positioned along traffic lanes are designed to protect the surroundings from excessive noise. Such structures are to reverberate, diffract and damp the propagating acoustic waves. However, this method of shielding has some disadvantages which include constraint visibility and structure-born noise. The interaction between traffic-caused movement of air mass and acoustic barriers may generate infra noise waves. That is undesirable and should be estimated. The authors undertook the research to diagnose the plausible side effect of structure-born noise of such barriers because it may influence human body (Kasprzak, 2014). As a mechanical structure, the acoustic barrier is characterized by mechanical parameters which, in the field of modal analysis, are made up of natural frequencies, damping factors and mode shapes. In this paper the authors investigated the acoustic pressure distribution in the neighborhood of a real acoustic barrier in the scope of infra noise propagation. The methods of modal analysis were used to identify natural frequencies of the barrier and dominating frequencies of propagating waves in the far field. The correlation between observed vibration and acoustic signals is presented. L1 - http://www.czasopisma.pan.pl/Content/115754/PDF/aoa.2020.132486.pdf L2 - http://www.czasopisma.pan.pl/Content/115754 PY - 2020 IS - No 1 EP - 110 DO - 10.24425/aoa.2020.132486 KW - modal analysis KW - infra range noise KW - vibration KW - acoustic barrier KW - road traffic A1 - Staniek, Andrzej A1 - BartmaĊ„ski, Cezary PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 45 DA - 2020.02.26 T1 - Side Effect of the Use of Acoustic Barriers Observed in the Infra Range SP - 103 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/115754 T2 - Archives of Acoustics ER -