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Train Noise - Comparison of Prediction Methods

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Němec M., Danihelová A., Gejdoš M., Gergel' T., Danihelová Z., Suchomel J., Čulík M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 1
125-127
EN
Railway noise in towns and city centres is one of the environmental problems. Defining the noise level is possible in two ways - via in situ measurement or via calculation (prediction). For the comparison of objectively measured values of sound pressure levels from railroads two methods used in the Slovak Republic were chosen - Schall 03 and the Czech prediction method. Track number 170: Zvolen-Vrútky in the town Zvolen was selected as the measurement location of noise exposure. Method Schall 03 overestimates the measurement values by approximately 1 dB and the Czech method by 4 dB. Both prediction methods, in spite of the systematic overestimating, describe the real noise situation very well; the calculated Pearson coefficient of correlation with Schall 03 method was 0.94 and with the Czech method 0.90.
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Studies on Infrasound Noise Emitted by Wind Turbines of Large Power

70%
Boczar T., Malec T., Wotzka D.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
850-853
EN
The subject area of this article applies to study of infrasound signals generated by the work of modern wind turbines. Infrasound noise measurements were conducted in accordance with assumptions of the EN 61400-11 standard. The object of study was a newly commissioned wind farm with a total electrical power equal to 30 MW. The considered power station consisted of 15 new wind turbines, each with a capacity of 2 MW. Scope of the analysis performed included designation of time runs, depicting temporal changes, and designation of frequency spectra of the recorded infrasound signals. Evaluation of the impact of changes in wind speed was made. Moreover, the scope of analysis, performed in this field, concerned assessment of the impact on the obtained results values of meteorological parameters related to the applied measurement system. Values obtained from measurements were related to and compared with the limits specified in standards and regulations existing in this field.
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