22 documents found, page 1 of 3

An experimental/numerical hybrid methodology for the prediction of railway-indu...

A novel experimental/numerical hybrid methodology for the assessment of railway-induced ground-borne vibration in buildings based on experimental measurements in the soil surface is proposed in this paper. This methodology has been specifically designed for the prediction of railway-induced vibration in buildings to be constructed close to an operative railway infrastructure, although it can be applied for othe...

Adaptive Analysis of Acoustic-Elastodynamic Interacting Models Considering Freq...

CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), CAPES (Coordenação de Aperfeiçoamento de Pessoal de Nível Superior), and FAPEMIG (Fundação de Amparo à Pesquisa do Estado de Minas Gerais)

Acoustic behavior of porous concrete. Characterization by experimental and inve...

The use of porous concrete solutions with lightweight aggregates has become increasingly common in noise control due to their versatility in exterior and interior applications. In this work, samples of porous consolidated concrete with aggregates of expanded clay were produced, in order to study the influence of the grain size, thickness and water/aggregate/cement ratio on the sound absorption. Experimental tec...

An Efficient Technique for Surface Strain Recovery from Photogrammetric Data us...

In recent years, techniques for monitoring displacements and surface strains in laboratorial tests have been introduced. Some of those methods are based on photogrammetry and image post-processing, allowing both displacement and strain fields to be monitored at a significant number of target points at any stage. This manuscript aims at contributing by proposing a simple and comprehensive approach for monitoring...

A model for acoustic absorbent materials derived from coconut fiber

In the present paper, a methodology is proposed for obtaining empirical equations describing the sound absorption characteristics of an absorbing material obtained from natural fibers, specifically from coconut. The method, which was previously applied to other materials, requires performing measurements of air-flow resistivity and of acoustic impedance for samples of the material under study. The equations tha...

An Overview of Recent Advances in the Iterative Analysis of Coupled Models for ...

Wave propagation problems can be solved using a variety of methods. However, in many cases, the joint use of different numerical procedures to model different parts of the problem may be advisable and strategies to perform the coupling between them must be developed. Many works have been published on this subject, addressing the case of electromagnetic, acoustic, or elastic waves and making use of different str...

Advanced Techniques in Computational Mechanics

Numerical study towards the use of a SH wave ultrasonic-based strategy for crac...

The cost of rehabilitation works increases exponentially with time. Therefore, the development of on-site non-destructive tests (NDTs) for early detection of damage in concrete structures is an extremely important goal. However, in spite of the recent new technological developments, current assessment techniques are still based on visual inspections and are therefore only suitable for mapping major damages. An ...

A Hybrid Analytical-Numerical Model Based on the Method of Fundamental Solution...

Several numerical and analytical models have been used to study underwater acoustics problems. The most accurate and realistic models are usually based on the solution of the wave equation using a variety of methods. Here, a hybrid numerical-analytical model is proposed to address the problem of underwater sound scattering by an elastic shell structure, which is assumed to be circular and that is buried in a fl...

Coupled Numerical Methods in Engineering Analysis