Wyniki wyszukiwania - BazTech

1

Cumulative Industrial Noise Impact on the Environment

Wszołek T.

Archives of Acoustics

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2017

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Vol. 42, No. 2

169--174

EN

The paper presents basic legal conditions, applicable to the calculation of cumulative noise levels in the environment with indication mainly on lack of detailed regulations both in formal and methodological approach for evaluating those levels. The paper is focused on methodological approach with the emphasis on analysis of existing case studies in the industry. The main subject of the analysis is the cumulation of industrial noise sources: newly designed and existing ones, together with a proposal of accumulate other types of the noise. Evaluation of cumulative noise levels for new (designed) objects is realised by computational methods, and for existing objects, by measurements or by combination of measurement and computational methods. It is assumed that the cumulative level is an energetic sum of the rating levels for all installations and it will not exceed the limit value in a given place. For the cumulation of different noise sources, the weighting for criterion values of these sources will be applied in aggregation.

2

Diagnostic Symptoms of Corona Audible Noise in Continuous Monitoring Systems

Wszołek T.

Archives of Acoustics

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2011

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Vol. 36, No. 1

151-160

EN

Random nature of corona processes in UHV power lines and the accompanying noise is the reason that in practice the best determination of acoustic parameters, necessary for the noise evaluation, is obtained from the continuous monitoring procedure. However because of considerable fluctuations (both the useful signal part and the interfering components), careful selection of monitored parameters is necessary to enable a possibility of automatic determination of the parameters that are required for long-term evaluation of corona noise. In the present work a practical realization is shown for estimation of corona noise parameters, based on the data obtained from continuous monitoring stations, making use of the statistical spectra measurement and characteristic features of corona process acoustic signal. Selected results are presented from continuous monitoring of corona noise generated at a 400 kV power line, with special attention focused on definitions of the measured quantities, which enable automatic estimation of the basic factors required for noise evaluation. Accompanying monitoring of environmental conditions, including humidity, precipitation intensity and fog density, that are well correlated with the corona process intensity, which might definitely increase the filtration efficiency of environmental disturbances and on the other hand, it enables verification of calculation methods applied to corona noise. The paper also contains a description of practical approach to selection signal parameters of corona noise in continuous monitoring stations.

3

Modelowanie rozkładu wskaźników hałasu ulotu w otoczeniu linii wysokiego napięcia

Wszołek T.

Przegląd Elektrotechniczny

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2010

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R. 86, nr 11b

111-114

PL

W pracy pokazano model do obliczania poziomu mocy akustycznej jednostkowej długości przewodów fazowych w funkcji intensywności opadów, stanu technicznego oraz wysokości zawieszenia przewodów dla dowolnego układu geometrycznego linii WN. Przykładowe obliczenia rozkładu wskaźników długookresowych hałasu ulotu przeprowadzono w przekrojach poprzecznych oraz w postaci mapowej dla zróżnicowanych uwarunkowaniach terenowych.

EN

The paper shows a model to calculate the sound power level of unit length phase conductors as a function of rainfall intensity, the technical condition and the height of the suspended conductors for any geometric arrangement of power line. Sample calculations of the distribution of the long-term noise indicators were performed in cross sections and the form of maps in diverse terrain considerations.