Deriving correction functions to model the efficiency of noise barriers with complex shapes using boundary element simulations

Kasess, Christian H.; Kreuzer, W.; Waubke, Holger

doi:10.1016/j.apacoust.2015.09.009

Cited by 22 publications

(14 citation statements)

References 17 publications

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“…In applications in acoustics, the solutions of the Helmholtz equation are of particular importance, see e.g. [61], they are used for example for the numerical estimation of head-related transfer functions [64,79]. In general the problem of solving an integral equation can be seen as solving a linear equation…”

Section: Discussionmentioning

confidence: 99%

A Guide to Localized Frames and Applications to Galerkin-Like Representations of Operators

Balázs

Gröchenig

2017

Frames and Other Bases in Abstract and Function Spaces

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This chapter offers a detailed survey on intrinsically localized frames and the corresponding matrix representation of operators. We re-investigate the properties of localized frames and the associated Banach spaces in full detail. We investigate the representation of operators using localized frames in a so-called Galerkintype scheme. We show how the boundedness and the invertibility of matrices and operators are linked and give some sufficient and necessary conditions for the boundedness of operators between the associated Banach spaces.

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Section: Discussionmentioning

confidence: 99%

A Guide to Localized Frames and Applications to Galerkin-Like Representations of Operators

Balázs

Gröchenig

2017

Frames and Other Bases in Abstract and Function Spaces

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“…The height of the acoustic barrier is a design element that is most often done using the Maekawa diagram [2]. Although, other theories have been developed depending on the type of relief, the shape of the acoustic barrier [3], its thickness or the presence of an inclined cover [4] [5] as well as the type of noise source (point or line) [6], however Makawa Diagram remains today the most widely used method. This acoustic barrier sizing procedure based on Maekawa's theory represents a method hardly exploitable by engineers and architects due to the complexity of calculations required to be performed for the entire spectrum according to national noise protection requirements [7].…”

Section: Introductionmentioning

confidence: 99%

Urban sound energy reduction by means of sound barriers

Iordache

Ionita

2018

E3S Web Conf.

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In urban environment, various heating ventilation and air conditioning appliances designed to maintain indoor comfort become urban acoustic pollution vectors due to the sound energy produced by these equipment. The acoustic barriers are the recommended method for the sound energy reduction in urban environment. The current sizing method of these acoustic barriers is too difficult and it is not practical for any 3D location of the noisy equipment and reception point. In this study we will develop based on the same method a new simplified tool for acoustic barriers sizing, maintaining the same precision characteristic to the classical method. Abacuses for acoustic barriers sizing are built that can be used for different 3D locations of the source and the reception points, for several frequencies and several acoustic barrier heights. The study case presented in the article represents a confirmation for the rapidity and ease of use of these abacuses in the design of the acoustic barriers.

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“…O desempenho de uma barreira acústica depende, dentre outros fatores, da sua forma. Inves-tigações a respeito das diferentes formas, a saber, parâmetros como altura, espessura e detalhe do topo de uma barreira dão uma indicação da capacidade das barreiras acústicas de bloquear a transmissão de som (Yuzawa e Sone, 1981;Fujiwara et al, 1998;Kim e Yoon, 2015;Oldham e Egan, 2015;Kasess et al, 2016;Chobeau et al, 2017).…”

Section: Introductionunclassified

Quantificação do efeito benéfico de passagem inferior como barreira acústica

2018

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A utilização de barreiras acústicas é uma das medidas empregadas para minimizar o impacto gerado pelo ruído, pois é possível produzir uma atenuação no nível sonoro por meio da restrição à passagem do som diretamente da fonte para o receptor. As passagens inferiores em rodovias vêm sendo usadas para evitar cruzamentos em nível entre as vias. Pressupõe-se que esse desnível pode funcionar como uma barreira acústica contribuindo com a redução do ruído nas áreas circunvizinhas, com a vantagem de possuir pouco impacto visual. Neste artigo, analisou-se a passagem inferior construída na BR-230 com o objetivo de quantificar o efeito benéfico da mesma em relação a redução do ruído emitido. Medições de ruído foram realizadas na área urbana adjacente a esta passagem e, com os resultados obtidos, foram feitas correlações com expressões do modelo CoRTN para estimativa do ruído. Verificou-se, por meio comparativo, os benefícios que a passagem inferior disporia como solução acústica. Como resultado, obteve-se uma redução média de 11,8 dB(A), constituindo uma atenuação expressiva no nível de ruído para os pontos na região de sombra acústica.

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Deriving correction functions to model the efficiency of noise barriers with complex shapes using boundary element simulations

Cited by 22 publications

References 17 publications

A Guide to Localized Frames and Applications to Galerkin-Like Representations of Operators

A Guide to Localized Frames and Applications to Galerkin-Like Representations of Operators

Urban sound energy reduction by means of sound barriers

Quantificação do efeito benéfico de passagem inferior como barreira acústica

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