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Number of results: 6
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Abstract

The grid method is the most widely used technique for measurement-based noise assessment, and indeed is part of the ISO 1996-2 standard. Nevertheless it has certain disadvantages. The present work is an analysis of the grid method for evaluating noise, firstly in the city of Cáceres and, secondly in two other smaller towns. Using as reference a 200 metre grid study, a study was made of the effect of varying the size and form of the grid on the city’s overall noise value, the percentage of data found to lie above some reference thresholds, and the noise value assigned to a certain zone of the city. The ISO 1996 recommendations of the necessity of new sampling points and the method’s predictive capacity for these new measurements were also analyzed.

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Authors and Affiliations

Valentín Gómez Escobar
Juan Miguel Barrigón Morillas
Guillermo Rey Gozalo
Rosendo Vílchez-Gómez
Javier Carmona Del Río
Juan A. Méndez Sierra
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Abstract

Noise pollution is a major problem nowadays. In urban context, road traffic is the main source of noise pollution. People directly exposed to road traffic noise suffer from moderate to severe annoyance, headache, stress, feeling of exhaustion, and reduced work performance efficiency. As the sources and severity of noise pollution continue to grow, new approaches are needed to reduce the exposure. In this research, noise abatement has been investigated using a computer simulation model (SoundPLAN essential 4.0). Noise maps were developed using SoundPLAN essential 4.0 software. Noise maps are very beneficial to identify the impact of noise pollution. Data required for mapping are noise data (LAeq), road inventory data, geometric features of mapping area, category wise traffic counts, category wise vehicle speed, meteorological data such as wind velocity, humidity, temperature, air pressure. LAeq observed on all locations of the Central zone of Surat city was greater than the prescribed central pollution control board (CPCB) limits during day time and night time. This paper is focused on using acoustic software for the simulation and calculation methods of controlling the traffic noise. According to the characteristics of traffic noise and the techniques of noise reduction, road traffic noise maps were developed using SoundPLAN essential 4.0 software to predict the scope of road traffic noise. On this basis, four reasonable noise control schemes were used to control noise, and the feasibility and application effect of these control schemes can be verified by using the method of simulation modelling. The simulation results show that LAeq is reduced by up to 5 dB(A). The excess noise can be efficiently reduced by using the corresponding noise reduction methods.
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Bibliography

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2. Central Pollution Control Board (2000), Noise pollution regulation in India.
3. Cerdá S., Lacatis R., Gimenez A. (2013), On absorption and scattering coefficient effects in modellisation software, Acoustics Australia, 41(2): 151–155.
4. Golmohammadi R., Abbaspour M., Nassiri P., Mahjub H. (2007), Road traffic noise model, Journal of Research in Health Sciences, 7(1): 13–7, http://www.ncbi.nlm.nih.gov/pubmed/23343866.
5. Jhanwar D. (2016), Noise pollution: a review, Journal of Environment Pollution and Human Health, 4(3): 72– 77, doi: 10.12691/jephh-4-3-3.
6. Lavanya C., Dhankar R., Chhikara S. (2014), Noise Pollution: an Overview, International Journal of Current Research, 6(5): 6536–6543.
7. Manojkumar N., Basha K., Srimuruganandam B. (2019), Assessment, prediction and mapping of noise levels in Vellore City, India, Noise Mapping, 6(1): 38– 51, doi: 10.1515/noise-2019-0004
8. Oguntunde P.E., Okagbue H.I., Oguntunde O.A., Odetunmibi O.O. (2019), Public health in Ota Metropolis, Access Macedonian Journal of Medical Sciences, 7(8): 1391, doi: 10.3889/oamjms.2019.234
9. Paszkowski W., Sobiech M. (2019), The modeling of the acoustic condition of urban environment using noise annoyance assessment, Environmental Modeling and Assessment, 24(3): 319–330, doi: 10.1007/s10666-018-9643-1.
10. Prajapati P., Devani A.N. (2017), Review paper on noise reduction using different techniques, International Research Journal of Engineering and Technology (IRJET), 4(3): 522–524, https://irjet.net/archives/V4/i3/IRJET-V4I3145.pdf.
11. Sonaviya D.R., Tandel B.N. (2019a), 2-D noise maps for tier-2 city urban Indian roads, Noise Mapping, 6(1): 1–7, doi: 10.1515/noise-2019-0001.
12. Sonaviya D.R., Tandel B.N. (2019b), A review on GIS based approach for road traffic noise mapping, Indian Journal of Science and Technology, 12(14): 1–6, doi: 10.17485/ijst/2019/v12i14/132481.
13. Sonaviya D.R., Tandel B.N. (2020), Integrated road traffic noise mapping in urban Indian context, Noise Mapping, 7(1): 99–113, doi: 10.1515/noise-2020-0009.
14. Tandel B.N., Macwan J.E.M. (2017), Road traffic noise exposure and hearing impairment among traffic policemen in Surat, Western India, Journal of The Institution of Engineers (India): Series A, 98(1–2): 101–105, doi: 10.1007/s40030-017-0210-6.
15. Wolniewicz K., Zagubien A. (2015), Verifying traffic noise analysis calculation models, Polish Journal of Environmental Studies, 24(6): 2767–2772, doi: 10.15244/pjoes/58962.
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Authors and Affiliations

Dipeshkumar Ratilal Sonaviya
1
Bhaven N. Tandel
1

  1. Civil Engineering Department, SVNIT Surat, India
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Abstract

The paper presents experimental research carried out to determine the possible actions to reduce the noise generated by trams in a highly urbanised area. A few design strategies affecting tram ride quality have been presented – especially in the aspect of the acoustic phenomena. Main sources of the noise in trams were characterised. The paper includes selected results of comprehensive studies of tram noise in the pass-by test based on the authors’ research methodology. The tests were carried out on various types of trams to recognise the acoustic phenomena characteristic for the rolling stock in a selected tram system. The results of the measurements were analysed both in the field of amplitudes based on noise maps and in respect to frequencies based on noise spectra. The results indicated the rolling noise as important issue demanding taking some actions in order to reduce its level. In this area, elements for the application of individual attenuation solutions, i.e. at the source and during propagation, were presented. The results of the measurements were used as input data to the assumptions of the noise attenuation passive system, which was the final outcome of the study. Dedicated external dampers were used in the case of wheel and rail pairs, where the dominant power of the noise is emitted. The acoustic properties of the bogie area and the bogie side covers were redeveloped to hamper the noise propagation, which is a novel application. The presented results indicate measurable benefits from the applied solutions on the tram noise reduction.

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Authors and Affiliations

Tomasz Nowakowski
Bartosz Firlik
Tomasz Staśkiewicz
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Abstract

The impact of the noise radiated from merchant ships on marine life has become an active area of research. In this paper, a methodology integrating observation at a single location and modelling the whole noise field in shallow waters is presented. Specifically, underwater radiated noise data of opportunistic merchant ships in the waters of Zhoushan Archipelago were collected at least one day in each month from January 2015 to November 2016. The noise data were analyzed and a modified empirical spectral source level (SSL) model of merchant ships was proposed inspired by the RANDI-3 model (Research Ambient Noise Directionality) methodology. Then combining the modified model with the realistic geoacoustic parameters and AIS data of observed merchant ships, the noise mappings in this area were performed with N×2D of Normal Mode calculations, in which the SSL of each ship was estimated using the modified model. The sound propagation at different receiving positions is different due to the shielding effect of islands and bottom topography. The methodology proposed in this paper may provide a reference for modelling shipping noise in shallow waters with islands and reefs.
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Authors and Affiliations

Zilong Peng
1
Fulin Zhou
2
Jun Fan
2
Bin Wang
2
ORCID: ORCID
Huabing Wen
1

  1. Institute of Noise and Vibration, School of Energy and Power Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, People’s Republic of China
  2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, People’s Republic of China
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Abstract

The Environmental Noise Directive (END), published in 2002, was transposed into Romanian local law in 2005, and it was the starting point for the first urban noise mapping exercises, initially conducted in nine Romanian cities. This paper presents the main evolutionary aspects of the noise assessment process, the development of strategic noise maps, and action plans, dealing with both the legislative side and the practical approach and results obtained. The study considers the specific regulations established by the European Commission regarding environmental noise assessment and deals with the global context at the country level, in which they have been implemented and applied.
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Authors and Affiliations

Diana Ioana Popescu
1

  1. Technical University of Cluj-Napoca, Cluj-Napoca, Romania

Authors and Affiliations

Agnieszka Ozga
1
Jacek Wierzbicki
1
Dominik Mleczko
1

  1. Faculty of Mechanical Engineering and Robotics, Department of Mechanics and Vibroacoustics, AGH University of Krakow, Kraków, Poland

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