Department of Theoretical Mechanics, Dynamics and Vibrations, Faculty of Engineering, University of Mons, Mons, 7000, Belgium.
Department of Theoretical Mechanics, Dynamics and Vibrations, Faculty of Engineering, University of Mons, Mons, 7000, Belgium.
J Environ Manage. 2024 May;358:120686. doi: 10.1016/j.jenvman.2024.120686. Epub 2024 Apr 9.
Noise and vibrations generated by railway traffic can seriously affect the adjacent buildings and their residents. Different mitigation methods have been proposed in the past decades to tackle this challenge. Despite many mitigation measures presented in the literature, some of these measures have shown limitations in their application, while for others their carbon footprint does not justify their implementation in real projects. This study introduces the concept of forests as natural metamaterials to attenuate the vibrations generated at the wheel-rail interaction. In particular, a group of natural metamaterials, in the form of a forest, is introduced into a vehicle/track/soil validated model based on the two-step approach. The ideal tree/soil unit-cell constituting the forest is obtained through a parametric investigation of the geometrical and material properties in order to have the first band-gap within the main range of frequencies generated by railway traffic in urban areas. The vibration attenuation levels obtained by the introduction of the natural metamaterial are then evaluated by considering a range of operational velocities for the T2000 Brussels tram LRV (Light Rail Vehicle). Finally, some insights on the attenuation efficiency of the selected forest towards vibrations generated by HSTs (High-Speed Trains) are given by considering a mono-wheel model with a higher range of vehicle speeds.
铁路交通产生的噪声和振动会严重影响附近的建筑物及其居民。在过去的几十年中，已经提出了不同的缓解方法来应对这一挑战。尽管文献中提出了许多缓解措施，但其中一些措施在应用中显示出了局限性，而对于其他措施，其碳足迹并不足以证明它们在实际项目中的实施是合理的。本研究提出了将森林作为天然超材料来衰减轮轨相互作用产生的振动的概念。具体来说，在基于两步法的车辆/轨道/土壤验证模型中引入了一组以森林形式存在的天然超材料。通过对几何和材料特性进行参数研究，获得了理想的树木/土壤单元胞，以在城市地区铁路交通产生的主要频率范围内获得第一个带隙。然后，通过考虑 T2000 布鲁塞尔有轨电车 LRV（轻轨车辆）的一系列运行速度来评估引入天然超材料后的振动衰减水平。最后，通过考虑具有更高车辆速度范围的单轮模型，给出了所选森林对 HST（高速列车）产生的振动的衰减效率的一些见解。
