Study of Discretization Schemes for a Hybrid Methodology for the Assessment of Ground-Borne Noise in Buildings
54º Congreso Español de Acústica — Tecniacústica 2023
Abstract
In this article, a hybrid experimental/numerical methodology for the assessment of ground-borne noise and vibration in buildings to be constructed close to ground vibration sources is studied in a three-dimensional context. This methodology is based on three steps: First, the free field response due to the incident wave field induced by a particular ground vibration source is measured at the collocation points. Second, a set of virtual forces that equivalently represent the free field response induced by that incident wave field is then calculated. Finally, this set of virtual sources is applied to a structure-soil model to determine the response of the structure. In this paper, synthetic measurements are used to study different aspects related to the discretization strategies to be adopted to ensure accurate performance of the method. Specifically, two schemes for the distribution of virtual sources along the auxiliary surface are studied. Also, an exploration regarding the minimum number of collocation points that allows for a proper characterization of incident wave fields in the presence of shallow foundations is also presented. Of special relevance is the included discussion about sensor setup requirements for in situ experimental campaigns.