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고효인(Koh, Hyo-In) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.2
In this paper, the simulation technology of sound pressures when railway vehicles passe by a microphone or a noise receiver is discussed. Sound powers are predicted using the field measurement with a microphone array system. In order to visualize and determine the sound sources, the measured sound pressure signals are processed by means of the delay-and-sum method and the transfer factors are defined using speaker tests. The sound pressure level at each time instant is the sum of the contribution from all individual sources. Each source contributes to the total sound power level at the receiver position, with an amount defined by sound power of the source, attenuation due to the directivity of the sources, attenuation due to distance between source and receiver. A simulation yields the sound pressure level as a function of time, the A-weighted equivalent sound pressure level and the reduced sound pressures due to noise barriers.
고효인(Hyo-In Koh),조준호(Jun-Ho Cho) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
In this paper a study on the microphone array configuration and on the data calculation is introduced, which is aimed at using in the noise source identification and modeling of the high speed train. By means of numerical study and experiments, microphone arrangements for a microphone array and calculation method of the source strengths are investigated for the purpose of enhancing the analysis performance in terms of the resolution and the dynamic range in the source localization. The aim here is to investigate properties of some different microphone configurations to enable finding the best array/microphone configurations, to resolve/quantify noise from by-passing high speed trains with the speed of 400km/h. Some numerical and experimental results are shown and discussed.