1、外文原文：http:/ 中文 3387 字 本科毕业设计 外文文献及译文 文献、资料题目： Structural Design of Reinforced Concrete Sloping Roof 文献、资料来源： 网络 文献、资料发表（出版）日期： 2007.1 院 （部）： xxx 专 业： xxx 班 级： xxx 姓 名： xxx 学 &
2、nbsp; 号： xxx 指导教师： xxx 翻译日期： xxx毕业设计外文文献及译文 2 外文文献： Experimental and Theoretical Analysis of Railway Bridge Noise Reduction Using Resilient Rail Fasteners in Burgdorf, Switzerland K.P. Kstli1, C.J.C. Jones2, and D.J. Thompson2 1 Swiss Federal Railwa
3、ys SBB, I-FW-PS, Schanzenstr. 5 CH-3000 Bern 65, Switzerland Tel.: +41 (0)51 220 4699； Fax: +41 (0)51 220 5014 kornel.koestlisbb.ch 2 University of Southampton, ISVR, Highfield Southampton, SO17 1BJ, Southampton, UK Tel.: +44 (0) 2380 593224； Fax: +44 (0) 2380 593190 cjcjisv
4、r.soton.ac.uk Summary The increased noise level as trains travel over bridges is, in many situations, a source of disturbance for nearby residents. As well as the rolling noise radiated by the wheel and track, the vibration generated at the wheel-rail interface also propagates into the bridge struct
5、ure and the vibration response of the components of the bridge is an important extra source of noise compared with tracks at-grade. Vibration isolation of the bridge structure from the rail is therefore used to reduce noise. This often takes the form of resilient rail fasteners. Two different
6、elastic rail fastenings were therefore tested on a twin track bridge by the Swiss Railways (SBB). The bridge over the river Emme at Burgdorf, is a ballastless steel bridge with timbers between the rail fastener and the bridge. Hanging steel sleepers have been added between the wooden sleepers on whi
7、ch the track is 毕业设计外文文献及译文 3 supported to form a continuous deck under the track. To find the best elasticity for the rail fasteners, predictions of the bridge noise were made using the Norbert model. Measurements were made on the bridge with the track in its original state to p
8、rovide 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 from two suppliers were installed. The measurement after installation
9、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 the range of 2 to 4 dB, as indicated by the model. The results show similar reduction for both systems. 1 Introduction The m
10、ain reason for the increase in noise as trains cross a bridge is the vibration of the structure. 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 t
11、rack on the bridge 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 otherwise supported by the bridge structure. Resilient rail fasteners
12、were installed and the steel sleepers replaced with wooden sleepers in October 2006. The reconstruction was accompanied with noise measure- ments in May, October, December 06 and January 07. One track was equipped with resilient fasteners from Pandrol, the other, from Vossloh. The elasticity o
13、f the fasten- ers in both cases is about 20MN/m. To identify the effect of the hanging steel sleep- ers, additional noise measurements were carried out on one track after installing the resilient fasteners but before replacing the steel sleepers. To find the best elasticity for the rail fasteners, predictions of the bridge noise were made using the ISVR software Norbert (Noise of Railway Bridges and Elevated Structures) 1. Measurements were made on the track in its original state to provide
