Noise reduction in urban LRT networks by combining track based solutions

Vogiatzis, Konstantinos; Vanhonacker, Patrick

doi:10.1016/j.scitotenv.2015.05.060

Cited by 24 publications

(8 citation statements)

References 15 publications

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“…In the Equations (2) and 3, the symbol ω is the angular frequency, which can be calculated using Equation (4); K(ω) is the complex effective bulk modulus, which can be calculated using Equation 5; ρ(ω) is complex effective density, which is derived by Equation (6) [8,9,27,36,37].…”

Section: Transfer Matrix For the Porous Metalmentioning

confidence: 99%

“…The noises generated by large mechanical and electrical apparatuses are major component of industrial noise, which not only impair health of the operators, but also are detrimental to the residents living around the workshops [1]. In addition to traditional control strategies [2,3], such as the application of equipment with less noise, reasonable layout of the workshops, appropriate planting of vegetation, and wearing of personal protective appliance, installation of a proper acoustic absorber applications, the total thickness of the sound absorber is a critical factor, because the available space to install the sound absorber is limited. Therefore, sound absorption performances of these five kinds of acoustic absorbers with the limited total thickness of 30 mm, 50 mm, and 100 mm were investigated respectively in this study.…”

Section: Introductionmentioning

confidence: 99%

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Parameter Optimization for Composite Structures of Microperforated Panel and Porous Metal for Optimal Sound Absorption Performance

et al. 2019

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The composite structure of a microperforated panel and porous metal is a promising sound absorber for industrial noise reduction, sound absorption performance of which can be improved through parameter optimization. A theoretical model is constructed for the composite structure of a microperforated panel and porous metal based on Maa’s theory and the Johnson–Champoux–Allard model. When the limited total thickness is 30 mm, 50 mm, and 100 mm respectively, dimensional optimization of structural parameters of the proposed composite structure is conducted for the optimal average sound absorption coefficient in the frequency range (2000 Hz, 6000 Hz) through a cuckoo search algorithm. Simulation models of the composite structures with optimal structural parameters are constructed based on the finite element method. Validations of the optimal composite structures are conducted based on the standing wave tube method. Comparative analysis of the theoretical data, simulation data, and experimental data validates feasibility and effectiveness of the parameter optimization. The optimal sandwich structure with an actual total thickness of 36.8 mm can obtain the average sound absorption coefficient of 97.65% in the frequency range (2000 Hz, 6000 Hz), which is favorable to promote practical application of the composite structures in the fields of sound absorption and noise reduction.

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Section: Transfer Matrix For the Porous Metalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Parameter Optimization for Composite Structures of Microperforated Panel and Porous Metal for Optimal Sound Absorption Performance

et al. 2019

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“…Noise modeling was performed by Paožalytė et al using IMMI and CadnaA software (Paožalytė et al , 2011). Vogiatzis and Vanhonacker used IMMI software and performed noise modelling (Vogiatzis and Vanhonacker, 2016).…”

Section: Introductionmentioning

confidence: 99%

Prediction and simulation of aircraft noise in the international Eskisehir Hasan Polatkan airport (LTBY)

Akdeniz

Söğüt

Turan

2020

AEAT

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Purpose In recent years, in parallel with the increasing air traffic and the number of passengers in air transport, the number of people exposed to aircraft-induced noise has increased significantly. Especially people living in the areas close to the airports are affected by noise emission during the landing, take-off, taxi and ground operations. Negative effects of noise such as sleep disturbance, lack of concentration, anxiety and high blood pressure cardiac diseases were determined directly or indirectly for human health. For this reason, examining the noise effect caused by aircraft and determining the necessary measures to be taken is very important for the sustainable development of aviation. In the International Eskisehir Hasan Polatkan Airport (LTBY), this paper aims to calculate a noise mapping following international standards in line with the directives of the International Civil Aviation Organization (ICAO). Also, Annex 8, “Airworthiness of Aircrafts” and Annex 16, “Environmental Protection Volume 1 Aircraft Noise”, which were taken at the International Civil Aviation Convention, were proposed to determine the exposure caused by aircraft noise. Design/methodology/approach In this paper, noise levels for the day (07.00–19.00), evening (19.00–23.00) and night (23.00–07.00) period around LTBY were predicted and calculated by the use of the IMMI software according to the “ECAC Doc. 29-Interim” method for the prediction and computation of the aircraft noise. Findings According to the calculated/mapped values, in the 24 hours (Lden), the noise level is 65 dB (A) and above. In the day time zone, the noise level is 63 dB (A) and above. When the calculations for the evening time zone are examined, the noise level is above 58 dB (A). When the calculations for the night time frame are examined, it is calculated that there is no dwelling that is affected by the noise level above 53 dB (A). Practical implications Along with future improvements, it is recommended to be applied to other civil airports. Originality/value To the best of the authors’ knowledge, there is no previous research in the literature on aircraft noise mapping of LTBY. Also, unlike the software commonly used in other works in the literature, IMMI software was used in this study. Such investigations should be carried out in other civil airports in the coming years to struggle with noise emissions and noise control. If noise boundary values are exceeded, action plans should be developed for a sustainable aviation concept. Along with future improvements, it is recommended to be applied to other civil airports.

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“…Especially in the urban area, the increasing noise pollution is harmful to persons, animals, precise instruments, and structural buildings, and the harmful level is determined by its frequency, intensity, and time [2]. Therefore, noise reduction is one of the research focuses in the field of environmental protection [3], and development of a sound absorber with fine sound absorption performance is considered an effective method to achieving noise reduction [4,5]. Normally, sound absorption performance of the sound absorber with certain thickness is evaluated by the average sound absorption coefficient in the given frequency range, which indicates that the desired sound absorber must achieve a higher average sound absorption coefficient and utilize smaller total thickness simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Optimization and Validation of Sound Absorption Performance of 10-Layer Gradient Compressed Porous Metal

Yang

Shen

Bai

et al. 2019

Metals

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Sound absorption performance of a porous metal can be improved by compression and optimal permutation, which is favorable to promote its application in noise reduction. The 10-layer gradient compressed porous metal was proposed to obtain optimal sound absorption performance. A theoretical model of the sound absorption coefficient of the multilayer gradient compressed porous metal was constructed according to the Johnson-Champoux-Allard model. Optimal parameters for the best sound absorption performance of the 10-layer gradient compressed porous metal were achieved by a cuckoo search algorithm with the varied constraint conditions. Preliminary verification of the optimal sound absorber was conducted by the finite element simulation, and further experimental validation was obtained through the standing wave tube measurement. Consistencies among the theoretical data, the simulation data, and the experimental data proved accuracies of the theoretical sound absorption model, the cuckoo search optimization algorithm, and the finite element simulation method. For the investigated frequency ranges of 100–1000 Hz, 100–2000 Hz, 100–4000 Hz, and 100–6000 Hz, actual average sound absorption coefficients of optimal 10-layer gradient compressed porous metal were 0.3325, 0.5412, 0.7461, and 0.7617, respectively, which exhibited the larger sound absorption coefficients relative to those of the original porous metals and uniform 10-layer compressed porous metal with the same thickness of 20 mm.

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Noise reduction in urban LRT networks by combining track based solutions

Cited by 24 publications

References 15 publications

Parameter Optimization for Composite Structures of Microperforated Panel and Porous Metal for Optimal Sound Absorption Performance

Parameter Optimization for Composite Structures of Microperforated Panel and Porous Metal for Optimal Sound Absorption Performance

Prediction and simulation of aircraft noise in the international Eskisehir Hasan Polatkan airport (LTBY)

Optimization and Validation of Sound Absorption Performance of 10-Layer Gradient Compressed Porous Metal

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