음향파워 측정 시 오차에 대한 고찰

Title
음향파워 측정 시 오차에 대한 고찰
Other Titles
A Study on the Errors at the Measurement of Sound Power
Author(s)
임병덕나혜중
Keywords
Sound Power(음향파워); Reverberation Time(잔향시간); Direction Cosine Area(방향여현면적); Solid Angle(입체각)
Issue Date
201210
Publisher
한국소음진동공학회
Citation
한국소음진동공학회논문집, v.22, no.10, pp.917 - 924
Abstract
Noise power of large machineries, such as textile looms, winders, and twisting machines, is often measured in a reverberant space because they cannot be installed and operated in an anechoic chamber due to their size, weight, and operating conditions. Factors affecting the measurement error of an in-situ noise power measurement include the nonuniform reverberation time and the direction of sound intensity vector which is usually regarded as normal to the measurement surface. In this study errors due to these factors are estimated with the aid of numerical simulation based on the ray-tracing technique. The averaging of reverberation times measured at several points on the measurement surface is suggested to reduce the errors from nonuniform absorption. Also the direction cosine of each surface element is taken into account, which as a whole is represented as a solid angle of the measurement surface.
URI
http://hdl.handle.net/YU.REPOSITORY/27077http://dx.doi.org/10.5050/KSNVE.2012.22.10.917
ISSN
1598-2785
Appears in Collections:
공과대학 > 기계공학부 > Articles
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