Application of the Extreme Value Distribution to Estimate the Uncertainty of Peak Sound Pressure Levels at the Workplace.

Annals of Occupational Hygiene Pub Date : 2015-07-01 Epub Date: 2015-05-14 DOI:10.1093/annhyg/mev018
Paolo Lenzuni
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引用次数: 2

Abstract

Objectives: The purpose of this article is to develop a method for the statistical inference of the maximum peak sound pressure level and of the associated uncertainty. Both quantities are requested by the EU directive 2003/10/EC for a complete and solid assessment of the noise exposure at the workplace.

Methods: Based on the characteristics of the sound pressure waveform, it is hypothesized that the distribution of the measured peak sound pressure levels follows the extreme value distribution. The maximum peak level is estimated as the largest member of a finite population following this probability distribution. The associated uncertainty is also discussed, taking into account not only the contribution due to the incomplete sampling but also the contribution due to the finite precision of the instrumentation.

Results: The largest of the set of measured peak levels underestimates the maximum peak sound pressure level. The underestimate can be as large as 4 dB if the number of measurements is limited to 3-4, which is common practice in occupational noise assessment. The extended uncertainty is also quite large (~2.5 dB), with a weak dependence on the sampling details.

Conclusions: Following the procedure outlined in this article, a reliable comparison between the peak sound pressure levels measured in a workplace and the EU directive action limits is possible. Non-compliance can occur even when the largest of the set of measured peak levels is several dB below such limits.

极值分布在工作场所峰值声压级不确定性估计中的应用。
目的:本文的目的是开发一种最大峰值声压级和相关不确定度的统计推断方法。这两个数量都是欧盟指令2003/10/EC所要求的,用于对工作场所的噪音暴露进行完整和可靠的评估。方法:根据声压波形的特点,假设测得的峰值声压级的分布服从极值分布。最大峰值水平被估计为遵循此概率分布的有限总体中的最大成员。本文还讨论了相关的不确定度,不仅考虑了由于采样不完全造成的影响,而且考虑了由于仪器的有限精度造成的影响。结果:测量到的最大峰值级低估了最大峰值声压级。如果测量次数限制在3-4次,则低估可能高达4 dB,这是职业噪声评估中的常见做法。扩展不确定度也相当大(~2.5 dB),与采样细节的依赖性很弱。结论:根据本文中概述的程序,在工作场所测量的峰值声压级与欧盟指令行动限值之间进行可靠的比较是可能的。即使一组测量的最大峰值电平比这些限值低几个dB,也可能发生不符合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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