著者

栗田 健 若林 雄介 水島 文夫 山崎 展博 山田 晴夫 原 正明

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集 : JSME annual meeting

巻号頁・発行日

vol.2009, no.2, pp.253-254, 2009-09-12

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To increase the speed of Shinkansen trains, it becomes more important to reduce the noise generated from Shinkansen cars. We developed the high-speed test trains "FASTECH360" that have new equipment such as low-noise pantographs, pantograph noise insulation plates and sound-absorbing panels for the noise from the lower area of car bodies. We conducted running tests using "FASTECH360" from June of 2005 to June of 2009. As a result, the noise level of "FASTECH360S"(runs only on Shinkansen line) at the speed of 360km/h is reduced by more than 4 dB compared to that of series E2-1000, present commercial trains, at the speed of 360 km/h (at a distance of 25 m from the track). We also performed the noise analysis of "FASTECH360S" at 360 km/h. Consequently, we estimated that pantograph noise contribution to the overall noise level was reduced by about 7dB compared to that of E2-1000 at 360 km/h and contribution of noise from the lower part of cars to the overall noise level was reduced by about 1dB as well.

著者

山崎 展博 北川 敏樹 宇田 東樹 栗田 健 若林 雄介 西浦 敬信

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 (ISSN:21879761)

巻号頁・発行日

vol.83, no.851, pp.17-00146-17-00146, 2017 (Released:2017-07-25)

参考文献数

16

被引用文献数

4

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A method has been developed for predicting the aerodynamic noise from the bogie of a high-speed train using a two-dimensional microphone array in a low-noise wind tunnel. First, the mean velocity distribution of flow was simulated precisely in the low-noise wind tunnel. Next, aerodynamic noise generated by the bogie, hereinafter referred to as aerodynamic bogie noise, was estimated from the noise source distribution measured with the two-dimensional microphone array. Finally, based on the experimental results, the predicted noise generated from the lower part of the car (i.e. the total of the aerodynamic noise estimated through the proposed method and the rolling and machinery noise estimated in a previous study) was compared with the measurement data obtained near the track in the field test. It was found that the predicted sound pressure level showed good agreement with those measured in the field test. This suggests that the proposed method is appropriate to estimate the aerodynamic bogie noise quantitatively. It was also shown that the contribution of the aerodynamic bogie noise to the total noise generated from the lower part of the car is greater than that of rolling and machinery noise, especially below 500 Hz.