Excitation Source Function of Ground Vibration from Urban Railway Traffic by an Inversion Procedure
The exciting source of ground vibration from urban rail generally consists two parts, a quasi-static load moving through the railway, and a dynamic interaction between wheel and rail.The latter is caused mainly from the wheel-rail unevenness, and usually described by a power spectral density function, PSD in brief.From the three dimensional point of view, this kind of exciting source can hardly be measured directly.A procedure is proposed to invert the source function from the ground vibrations observed at array.A dynamic coupled train-track-3D ground model is adopted to calculate the vibrations from given PSD.The Micro-Genetic Algorithm including the operators of the tournament selection, the uniform crossover and the re-initialization together with an elitist strategy is schemed to the inversion.The object function is designed as minimum of the sum ofresidua between calculated and observed ground vibration acceleration levels of 18 center frequencies, at 4 ground points and twice trains.The result shows that the ground vibration acceleration levels calculated from the obtained excitation source function agree with those from the observed data quite well, even for an additional point where the observed data have never been adopted in the inversion process.
ground vibration excitation source inversion urban rail traffic
XiaXin Tao Xin Zheng FuTong Wang
School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;Department of Civil E School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China;School of Architectur
国际会议
上海
英文
374-380
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）