Efficient Transportation Model Essay

In order to achieve sustainable growth, many countries have promoted an efficient transportation model to decouple the economic growth from the use of resources, with lower use of fuel and carbon based systems.
The initiative leads to a modernization of several areas including connected urban and interurban train, metro, and tram systems. However, one of the most common environmental impacts from mass transit solutions are noise and vibration arising from different sources [1]. For instance, transportation noise can be annoying, disrupt sleep, interfere with communication, adversely impact health and even adversely affect academic performance. Some studies for general annoyance and activity disturbances show that train noise is more annoying

In this case, the proposed method allows the noise computation without former simplifications.
It can be seen that recent publications have produced computationally feasible numerical models which can represent the ground-borne vibration at specific sites. However, the radiated noise at the ground surface does not successfully achieved with a comprehensive formulation. Thus, there is a need to develop a detailed model that includes soil wave propagation and radiated noise from underground structures. This work describes a numerical model based on a domain decomposition to study fluid acoustics and solid scattering waves in a half-space medium. The model allows representing the acoustic and elastic scattered wave field inside underground structures, through the soil, and above the ground surface.
The paper is organised as follows. First, the numerical model is presented, the 2.5 D BEM-FEM fluid- acoustics formulation is described, and the Green’s function for a solid half-space bounded by a fluid for- mation is discussed. The proposed method is then verified with a benchmark problem studying the