外文翻譯--瑞士布格多夫鐵路橋降噪中使用彈性鋼軌扣件的實(shí)驗(yàn)與理論分析

1、中文 中文 3387 字本科畢業(yè)設(shè)計(jì)外文文獻(xiàn)及譯文文獻(xiàn)、資料題目：Structural Design of Reinforced Concrete Sloping Roof文獻(xiàn)、資料來(lái)源：網(wǎng)絡(luò)文獻(xiàn)、資料發(fā)表（出版）日期：2007.1院 （部）： xxx專 業(yè)： xxx班 級(jí)： xxx姓 名： xxx學(xué) 號(hào)： xxx指導(dǎo)教師： xxx翻譯日期： xxx畢業(yè)設(shè)計(jì)外文文獻(xiàn)及譯文3supported to for

2、m a continuous deck under the track. To find the best elasticity for the rail fasteners, predictions of the bridge noisewere made using the Norbert model. Measurements were made on the bridge with thetrack in its origin

3、al state to provide parameters for the model. These included rail and sleeper vibration as well as pass-by noise from service passenger and freight trains at different speeds. For the two tracks, elastic rail fasteners f

4、rom two suppliers were installed. The measurement after installation showed a clear noise reduction for the frequency range from 80 to 400 Hz of about 10 dB. However the reduction in A-weighted overall noise level is in

5、the range of 2 to 4 dB, as indicated by the model. The results show similar reduction for both systems.1 IntroductionThe main reason for the increase in noise as trains cross a bridge is the vibration of the structure.

6、 Here the rolling noise radiated by the track and bridge is studied for the twin track bridge over the River Emme at Burgdorf, Switzerland. Two photographs of the 57m long bridge are shown in Fig 1. The track on the brid

7、ge takes an unusual form in that steel sleepers have been added between the wooden sleepers on which the track is supported in order to form a continuous deck. The steel sleepers are hung from the rail and are not otherw

8、ise supported by the bridge structure.Resilient rail fasteners were installed and the steel sleepers replaced with woodensleepers in October 2006. The reconstruction was accompanied with noise measure-ments in May, Octob

9、er, December 06 and January 07. One track was equipped with resilient fasteners from Pandrol, the other, from Vossloh. The elasticity of the fasten-ers in both cases is about 20MN/m. To identify the effect of the hanging

10、 steel sleep-ers, additional noise measurements were carried out on one track after installing theresilient fasteners but before replacing the steel sleepers. To find the best elasticity for the rail fasteners, predicti