Louvred Noise Barrier for Traffic Noise Reduction

Abstract

Environmental issues near roads become more and more important in our society daily life. One of the most critical environmental issues is traffic noise. The present paper study louvred noise barrier designed by authors. The louvred noise barrier provides sound attenuation while allowing airflow and sunlight through it. Since the airflow resistance of the barrier is low, it requires a shallow foundation compared to conventional noise barriers. The sound attenuation performance of the louvred noise barrier was tested experimentally in a sound transmission chamber. Airflow resistance simulated using a computational fluid dynamics model. The simulation and experimental study were done with different louvred noise barrier setup: change of louvre blade angle and sound-absorbing material thickness. The results showed potential for future development for the field testing. Sound attenuation was highest in 2500 Hz and 3150 Hz octave frequency bands. Depending on the louvred barrier setup, sound attenuation was up to 28 dB(A) in mentioned frequency bands. The equivalent sound pressure level reduced up to 17 dB(A). The results showed that an increase in the louvre blade angle increases sound attenuation and increases airflow resistance.

Development of Louvered Noise Barrier with Changeable Sound Insulation from Waste Tire Rubber and Investigation of Acoustic Properties

“…Sound attenuation varied between 2 dBA and 17 dBA in equivalent broadband sound level. The barrier setup utilizing mineral wool proved to be most effective in the high-frequency bands [39]. In summary, it can be said that the angle of inclination of the blinds and their thickness have the greatest impact on sound reduction.…”

“…Just like in our study, scientists found that an increased reduction in sound pressure level was also noted with the elevation of the louvers' inclination angle. In other studies, a louvered noise barrier for traffic noise reduction was tested [39]. The barrier louvers were covered with mineral wool.…”

Noise Barriers Efficiency Dependence on Their Shape and Geometry

“…Šie elementai dažniausiai būna pagaminti iš garsą absorbuojančių, minkštų medžiagų arba garsą atspindinčių komponentų. Difraguojančių, skirtingos geometrijos triukšmą mažinančių barjerų elementų efektyvumą tyrė mokslininkai iš viso pasaulio (Asdrubali, 2007;Monazzam & Fard, 2011;Yamamoto, 2015).…”

Kybartų Seniūnijos Aplinkosauginės Būklės Vertinimas

“…Aplinkos problemos šalia kelių ir geležinkelių tampa vis svarbesnės mūsų visuomenės kasdieniame gyvenime (Astrauskas et al, 2021). Esminis faktorius, darantis didžiausią įtaką aplinkos triukšmo lygiams Kybartų mieste, yra geležinkelio ruožas (Nesterovas-Kybartai-Alvitas), kertantis Kybartų miestą rytų-vakarų kryptimi ir jungiantis Lietuvą su Kaliningrado sritimi vakarinėje miesto dalyje netoli Kybartų magistralės pasienio kontrolės punkto.…”