Noise Control Plans in Cities – Selected Issues and Necessary Changes in Approach to Measures and Methods of Protection

Bohatkiewicz, Janusz

doi:10.1016/j.trpro.2016.05.458

Cited by 14 publications

(6 citation statements)

References 1 publication

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“…Noise control is an important issue in modern life. A lot of factors contribute to its increase, e.g., population growth, expansion of the urban centers, densification of the housing sector, correlated to the number of vehicles, the development of automatic machines in industrial companies and devices [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The human audible frequency range extends up to 15 kHz for most persons, and can reach 20 kHz for children and young people [10]. The sound absorption coefficient gives information about the acoustical effectiveness of a material and is defined as the fraction of the energy of incident sound waves absorbed by the material [1,4]. The values of the sound absorption coefficient are between 0 (no absorption) and 1 (complete absorption, e.g., acoustical walls in recording studios) [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Sound-Absorption Coefficient of Bark-Based Insulation Panels

Tudor

Dettendorfer²,

Kain

et al. 2020

Polymers

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The objective of this study was to investigate the sound absorption coefficient of bark-based insulation panels made of softwood barks Spruce (Picea abies (L.) H. Karst.) and Larch (Larix decidua Mill.) by means of impedance tube, with a frequency range between 125 and 4000 Hz. The highest efficiency of sound absorption was recorded for spruce bark-based insulation boards bonded with urea-formaldehyde resin, at a level of 1000 and 2000 Hz. The potential of noise reduction of larch bark-based panels glued with tannin-based adhesive covers the same frequency interval. The experimental results show that softwood bark, an underrated material, can substitute expensive materials that involve more grey energy in sound insulation applications. Compared with wood-based composites, the engineered spruce bark (with coarse-grained and fine-grained particles) can absorb the sound even better than MDF, particleboard or OSB. Therefore, the sound absorption coefficient values strengthen the application of insulation panels based on tree bark as structural elements for the noise reduction in residential buildings, and concurrently they open the new ways for a deeper research in this field.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Sound-Absorption Coefficient of Bark-Based Insulation Panels

Tudor

Dettendorfer²,

Kain

et al. 2020

Polymers

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“…There was also evidence of inadequate urban growth near the study areas and the mitigation proposals were guided towards these aspects, also evidencing that it is not a specific problem for the Kennedy locality, but that it occurs in other localities of the city. Other investigations carried out in other environments have taken into account different factors for the control of environmental noise, such as the adequacy of roads with asphalt, the prohibition of passage of heavy vehicles, which emit higher noise levels, the reduction of speed, increase in vehicle flow, decrease in noise from motorcycle leaks, construction of buildings that act as a barrier and architectural designs of city construction that take into account the wind direction for propagation and dispersion of pollutants [44], [45]. Despite this, some of these actions are not yet adaptable and would not fulfill their purpose in the study locations and, in general in the city of Bogotá, since the main roads are not wide enough to allow for better vehicle flow and speed reduction, it generates traffic jams that, due to braking and acceleration phenomena, in addition to the poor state of maintenance of the tracks, noise emissions are increased.…”

Section: Discussionmentioning

confidence: 99%

Territory management based on the assessment of environmental noise in near areas to two medical centers on zone planning units 44 and 47 in Bogotá

2020

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Introduction:This article shows the evaluation of environmental noise around the medical centers located in the UPZ Americas and Kennedy Central - Bogotá, and the proposal of some actions related to the planning of the territory as a strategy for mitigation. Problem:The Kennedy town has presented high levels of environmental noise, which is a worrying aspect due to its correlation with the effects on people's health. Objective:This research was conducted for the purpose of compiling updated information on environmental noise in the Kennedy locality and evaluating regulatory compliance and identifing the phenomena to establish actions that lead to its mitigation. Methodology:The measurement process was guided under the guidelines of ISO 1996:1 and the parameters established in Res. 627/2006 of the Ministry of Environment. Results:The ambient noise levels exceed the maximum permissible limits (55 dB) on the different days and hours of measurement. It was also determined that this phenomenon is mainly related to high vehicular flow as well as formal and informal commercial activities around medical centers. Conclusion:There is no regulatory compliance in relation to environmental noise and the territorial plan established in the UPZ. The suggested actions are: use of parks to plant native trees that act as biological barriers, non-use of surrounding streets as secondary traffic roads and reorganization of trade activities. Originality:Updated environmental noise data was obtained around medical centers in Kennedy and problems of inappropriate growth and development were identified. Limitations:Lack of information on environmental noise measurements in other sectors of the area.

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“…The sound absorption coefficient is the measure for the acoustical effectiveness of a material and is defined as the fraction of the energy of incident sound waves absorbed by the material [27]. The sound absorption coefficient can range between 0 (no absorption) and 1 (complete absorption) [28].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Properties of Larch Bark Panels

Tudor

Krišťák

Barbu

et al. 2021

Forests

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The potential of tree bark, a by-product of the woodworking industry, has been studied for more than seven decades. Bark, as a sustainable raw material, can replace wood or other resources in numerous applications in construction. In this study, the acoustic properties of bark-based panels were analyzed. The roles of the particle size (4–11 mm and 10–30 mm), particle orientation (parallel and perpendicular) and density (350–700 kg/m3) of samples with 30 mm and 60 mm thicknesses were studied at frequencies ranging from 50 to 6400 Hz. Bark-based boards with fine-grained particles have been shown to be better in terms of sound absorption coefficient values compared with coarse-grained particles. Bark composites mixed with popcorn bonded with UF did not return the expected results, and it is not possible to recommend this solution. The best density of bark boards to obtain the best sound absorption coefficients is about 350 kg/m3. These lightweight panels achieved better sound-absorbing properties (especially at lower frequencies) at higher thicknesses. The noise reduction coefficient of 0.5 obtained a sample with fine particles with a parallel orientation and a density of around 360 kg/m3.

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Noise Control Plans in Cities – Selected Issues and Necessary Changes in Approach to Measures and Methods of Protection

Cited by 14 publications

References 1 publication

Sound-Absorption Coefficient of Bark-Based Insulation Panels

Sound-Absorption Coefficient of Bark-Based Insulation Panels

Territory management based on the assessment of environmental noise in near areas to two medical centers on zone planning units 44 and 47 in Bogotá

Acoustic Properties of Larch Bark Panels

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