To predict a wayside noise level precisely it is important to comprehend contribution of individual sound source generated from Shinkansen vehicles in detail at a measuring point. First, the power level of individual sound source was estimated by a field test with an acoustic mirror. Next, an acoustic experiment using 1/25 scale models was conducted to investigate the insertion loss of sound barriers for each sound source position. Based on the results of the field test and the acoustic experiment, the contributions of the individual sound source to the wayside noise level were estimated when the Shinkansen vehicles run on a viaduct equipped with sound barriers.

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