Random Distribution of Long-Term Indicators of Variable Emission Conditions

W. Batkoa and B. Przysuchab aFaculty of Mechanical Engineering and Robotics, Department of Mechanics and Vibroacoustics, AGH University of Science and Technology, al. A. Mickiewicza 30, 30-059 Kraków, Poland bFaculty of Management, Department of Quantitative Methods in Management of Economy, Lublin University of Technology, Nadbystrzycka 38, 20-618 Lublin, Poland

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This study is dedicated to the problem of estimating uncertainties of long-term noise indicators, when differences in the sound level emission at various time periods of the calendar year are taken into consideration. This task is defined by referring their influence values - in the determined time intervals - to the year period. Due to the limited possibilities of a total monitoring of parameters necessary for the precise estimation of the long-term sound levels, this estimation process is often limited (in accordance with the EU environmental recommendations) to two condition classes. They are defined by two sound levels occurring with probabilities (frequencies) p and 1-p, in the analyzed reference period. In this paper we present a method of calculating uncertainties of this procedure assuming that frequency of determined events are known. The probability distribution for the estimated value was assessed. The developed model formalism of the estimation of uncertainties of long-term sound levels together with algorithms assigned to it, was analyzed. The proposed solution was illustrated by examples of uncertainty calculations of the averaged sound levels in acoustic assessments of environmental hazards.

DOI: 10.12693/APhysPolA.119.1086 PACS numbers: 43.28.Lv, 43.50.-x, 02.50.Cw