有限要素法による遮音材の遮音性能を考慮した鉄道高架橋防音壁の騒音低減評価

抄録

In the noise prediction for railway viaducts, the concrete noise barriers are often treated as the rigid walls. Assuming that the sound insulation panels are additionally installed, of which sound insulation performance is lower than that of the concrete noise barriers, it is desirable to take the performance into consideration to avoid the overestimation of noise reduction performance. In this study, the sound insulation performance of the panel is regarded as a damping component and its characteristics is given by associating the complex sound speed with the transmission loss of the panel in FEM acoustic analysis. As a result, it was confirmed that the attenuation corresponding to the transmission loss of the sound insulation panel can be set appropriately for the plane wave propagating model in the three-layered media. In addition, it was concluded that the difference due to the transmission loss of the additional sound insulating panel can be evaluated by comparison with the case where the additional part is regarded as a rigid wall.