Development of a 3D finite element acoustic model to predict the sound reduction index of stud based double-leaf walls

Abstract

Building standards incorporating quantitative acoustical criteria to ensure adequate sound insulation are now being implemented. Engineers are making great efforts to design acoustically efficient double-wall structures. Accordingly, efficient simulation models to predict the acoustic insulation of double-leaf wall structures are needed. This paper presents the development of a numerical tool that can predict the frequency dependent sound reduction index R of stud based double-leaf walls at one-third-octave band frequency range. A fully vibro-acoustic 3D model consisting of two rooms partitioned using a double-leaf wall, considering the structure and acoustic fluid coupling incorporating the existing fluid and structural solvers are presented. The validity of the finite element (FE) model is assessed by comparison with experimental test results carried out in a certified laboratory. Accurate representation of the structural damping matrix to effectively predict the R values are studied. The possibilities of minimising the simulation time using a frequency dependent mesh model was also investigated. The FEA model presented in this work is capable of predicting the weighted sound reduction index Rw along with A-weighted pink noise C and A-weighted urban noise Ctr within an error of 1 dB. The model developed can also be used to analyse the acoustically induced frequency dependent geometrical behaviour of the double-leaf wall components to optimise them for best acoustic performance. The FE modelling procedure reported in this paper can be extended to other building components undergoing fluid–structure interaction (FSI) to evaluate their acoustic insulation

A Computationally-Efficient Numerical Model to Characterize the Noise Behavior of Metal-Framed Walls

“…Accurate prediction of the noise behaviour in metal walls is a challenging problem [1]. The European Union's Green Paper on Future Noise policy [2] estimates 80 million people suffering from unacceptable noise levels that cause sleep disturbance and an additional 170 million having annoyance during the daytime due to inadequate acoustic insulation.…”

“…The reasons for the higher noise transmission exhibited by metal-framed walls are due to the phenomenon of acoustic bridging [1]. This has stimulated interest in efficient computational models that can simulate the acoustic insulation of common building elements, such as metal-framed walls.…”

Programação em plataforma BIM e a Norma de Desempenho Brasileira: Desenvolvimento de uma aplicação para estimativa de performance acústica em projetos arquitetônicos

“…Uma série de aspectos de sistemas construtivos das edificações habitacionais tornam-se indispensáveis nas decisões tecnológicas, aspectos que muitas vezes podem ser mensurados, simulados e otimizados por meio de softwares (Arjunan et al, 2014;Kim & Kim, 2007). Por esta ótica, embora a customização de software seja uma prática comum em áreas como engenharia mecânica e design, é algo que ainda está em desenvolvimento na arquitetura, considerando as crescentes necessidades de otimização dos processos de projeto e melhorias na avaliação da performance (Matcha & Quasten, 2009).…”

“…Contudo, a ferramenta não substitui softwares especializados de simulação, com pesquisas mais aprofundadas sendo desejáveis em casos onde é necessária uma maior precisão ou rigor técnico acerca da estimativa do índice de redução sonora em sistemas construtivos (Arjunan et al, 2014;Takahashi, 2016).…”

Energy saving and noise reduction of flow mixing performance intensified by rigid‐flexible combination impeller

“…Meanwhile, a considerable portion of input energy is transferred for noise creation. [6] Mechanical noise and fluid-mixed noise caused by the stirred reactor accelerate the aging of machine and produce environmental noise pollution. With the rise of machinery manufacturing technology and the improvement of machining accuracy level, the noise caused by equipment operation can be effectively eliminated.…”