Low frequency traffic noise prediction and modelling of noise barriers using FEM

The paper is a part of investigation near one of the busiest Lithuanian roads with big percentage of heavy traffic where the spectrum of traffic noise and efficiency of existing noise screens also enhancement of them have been studied. The paper presents use of finite element method (FEM) for traffic noise prediction at low (16-200 Hz) frequencies also for modelling of noise barriers and enhancement of them by adding tops (heads). Acoustic field transformation simulation model is prepared within COMSOL software. Model is verified according investigation in situ (measurements) and deals with divergence loss, diffraction from obstacles, absorption and reflection from surfaces of cylindrical sound waves solving Helmholtz equation. Numerical prediction showed that investigated additional tops can improve effectiveness of noise barrier either at low frequencies (Leq(16-200 Hz)) up to ~2 dB and up to ~7 dB at discrete frequencies

State v. Torres Appellant\u27s Brief Dckt. 40198

https://digitalcommons.law.uidaho.edu/not_reported/2040/thumbnail.jp