Finite Element Method for the Estimation of Insertion Loss of Noise Barriers: Comparison with Various Formulae (2D)

Papadakis, Nikolaos M.; Stavroulakis, Georgios Ε.

doi:10.3390/urbansci4040077

Cited by 14 publications

(10 citation statements)

References 77 publications

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“…Mathematical methods have been widely used to determine the diffraction properties of the barriers. These methods can be based on the boundary element method [19,20], the finite element method [21,22], and the finite difference method [23].…”

Section: Approaches For Determining Noise Barrier Effectivenessmentioning

confidence: 99%

Approaches for Noise Barrier Effectiveness Evaluation Based on In Situ “Insertion Loss” Determination

Barba¹,

Martínez-Orozco²

2023

Noise Control

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In situ evaluation of the effectiveness of noise barriers may be based on the assessment of their intrinsic or extrinsic characteristics. The evaluation of intrinsic characteristics is based on acoustic properties, such as noise barrier absorption or insulation. The evaluation of the extrinsic characteristics is based on the calculation of the barrier Insertion Loss, which is defined as the difference in the noise level before and after the installation of the barrier. Insertion Loss is calculated using two different approaches: the direct and indirect methods. The direct method is used when the barrier has not been installed yet or can be removed, while the indirect method is used when the barrier is already installed and cannot be easily removed. This chapter describes the different approaches used in the scientific literature for in situ evaluation of the effectiveness of noise barriers and discusses the noise attenuation levels obtained with each approach.

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Section: Approaches For Determining Noise Barrier Effectivenessmentioning

confidence: 99%

Approaches for Noise Barrier Effectiveness Evaluation Based on In Situ “Insertion Loss” Determination

Barba¹,

Martínez-Orozco²

2023

Noise Control

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“…With the development of computer technology, numerical methods for finding sound fields are widely used. In [12,13], the application of the partial element method (FEM) and the boundary element method (BEM) for finding the field around barriers with a specially shaped edge is presented.…”

Section: Research Of Existing Solutions To the Problemmentioning

confidence: 99%

Influence of sound-absorping properties of noise protection barriers on road traffic participants

Zaets

Bida

2021

TAPR

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The object of research is the sound field from linear sound sources between two parallel impedance noise barriers. The presence of barriers changes the structure of the sound field, as a result of which the sound pressure level in the area between the barriers increases. An increase in sound levels leads to both a decrease in the effectiveness of noise barriers and an increase in the negative impact on road users. One of the ways out of this situation is the construction of barriers with sound-absorbing properties. In this paper, the influence of the impedance properties of the barriers at the level of sound pressure in the area between the barriers is considered. The finite element method was chosen to calculate the sound field around the barrier. A computer model of a linear sound source with vertical sound-absorbing barriers on both sides of the source was built in the Comsol Multiphysics software environment. The sound absorption properties of the barrier were determined by the acoustic impedance of the face of the barrier. The sound fields were calculated in octave bands with geometric mean frequencies from 31 to 500 Hz. In addition, the parameters that were also analyzed were the distance between the barriers and their height. The solution of the problem made it possible to obtain a field of sound pressure levels around the barrier. Changeable simulation parameters made it possible to analyze a large number of situations of relative position of barriers and their heights encountered in engineering. Studies have shown that only at low frequencies and relatively small distances between barriers, the sound pressure level can increase significantly. However, it has also been shown that the use of sound-absorbing lining of noise barriers can reduce the sound pressure levels in the area between the barriers and improve the acoustic conditions for road users.

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“…Computational methods can be exploited for the study of multi-neck Helmholtz resonators, as previously demonstrated by Selamet et al [34] utilizing a BEM. Among computational methods, the FEM is probably the most widely used in acoustic problems and has been applied for noise control [37], in architectural and environmental acoustics [38] and also in the frequency and time domain [39,40]. This work seeks to evaluate the efficacy and usability of the FEM for the determination of the resonance frequency of multi-neck Helmholtz resonators.…”

Section: Introductionmentioning

confidence: 99%

FEM Investigation of a Multi-Neck Helmholtz Resonator

Papadakis,

Stavroulakis

2023

Applied Sciences

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An increasingly significant area of research with several applications in numerous disciplines is that of multi-neck Helmholtz resonators. This research is set to explore the accuracy and applicability of the finite element method (FEM) for the calculation of the resonance frequency of multi-neck Helmholtz resonators. The FEM is employed for the estimation of the resonance frequency in various cases of multi-neck Helmholtz resonators: with cylindrical or spherical bodies, with unflanged or flanged necks of various dimensions and with various combinations of the above. Also, single neck resonators are examined. The FEM results are compared with the results of a recently proposed theoretical model available in the literature and with the outcome of the lumped element approximation (multi-neck) accounting for the added neck surface area. Comparisons revealed little deviation between the FEM and theoretical model (less than 1.1% error of calculation for every case). On the contrary, in comparison with the lumped element approximation (multi-neck), the error of calculation is significant (up to 40.3% for the cases examined). The FEM will prove useful in expanding our understanding of how multi-neck Helmholtz resonators perform under various conditions and configurations. The present research, which highlights the applicability of the FEM for the calculations of the resonance frequency of multi-neck Helmholtz resonators, goes a step further; this approach can be applied in special cases where it is not trivial to apply an analytical formula. The method can be used for applications of multi-neck Helmholtz resonators for various fields such as acoustic metamaterials, musical acoustics and noise mitigation.

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Finite Element Method for the Estimation of Insertion Loss of Noise Barriers: Comparison with Various Formulae (2D)

Cited by 14 publications

References 77 publications

Approaches for Noise Barrier Effectiveness Evaluation Based on In Situ “Insertion Loss” Determination

Approaches for Noise Barrier Effectiveness Evaluation Based on In Situ “Insertion Loss” Determination

Influence of sound-absorping properties of noise protection barriers on road traffic participants

FEM Investigation of a Multi-Neck Helmholtz Resonator

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