摘要
为研究路基段列车引起环境振动传递特性以及列车编组、速度、轴重等因素对振动的影响,对昌九城际铁路线路基段进行大地振动现场测试。从时域、频域等多方面分析五种列车在不同速度下运行引起的三向大地振动。结果表明:近场大地振动能量集中在10 Hz~200 Hz,远场在10 Hz~80 Hz,近场处X、Y、Z方向主频分别为38.7 Hz、51.9 Hz、64.4 Hz,远场处主频均为25.9 Hz;随着距离的增加,X与Z方向在各频段的振动衰减量相似,Y方向在各频段的衰减量大于X与Z方向;地面竖向Z振级与列车速度近似呈线性关系,在30 m处Z振级增大速率为0.0714dB/(km/h);列车速度变化对50~100 Hz的高频振动影响较大,速度由36增大至119 km/h时,16、50、100 Hz处Z方向分别增加了9.56、17.13、14.87 dB;列车编组对地面振动响应影响较小,当运行速度为115 km/h时,CRH2A动车组列车的不同编组(8节或16节)下引起的地面振动响应几乎完全相同;列车轴重是影响地面振动响应大小的重要因素,且轴重越大引起的振动响应越大。
In order to study the transmission characteristics of environmental vibration caused by train on subgrade and the influence of train formation,speed,axle load and other factors on vibration,the field test of ground vibration was carried out on the base section of Changjiu intercity railway.The three-dimensional ground vibration caused by five kinds of trains running at different speeds is analyzed in time domain and frequency domain.The results show that the near field ground vibration energy is concentrated at 10 Hz-200 Hz,the far field is concentrated at 10 Hz-80 Hz,the main frequencies in X,Y and Z directions are 38.7 Hz、51.9 Hz and 64.4 Hz respectively,and the main frequencies in far field are all 25.9 Hz.With the increase of distance,the vibration attenuation in X and Z directions is similar,and the attenuation in Y direction is larger than that in X and Z directions;There is an approximate linear relationship between ground vertical Z vibration level and train speed,and the increasing rate of Z vibration level is 0.0714 dB/(km/h)at 30 m.The change of train speed has a great influence on the high frequency vibration of 50 Hz to 100 Hz.When the train speed increases from 36 km/h to 119 km/h,the Z direction at 16 Hz,50 Hz and 100 Hz increases by 9.56 dB,17.13 dB and 14.87 dB;The train formation has little influence on the ground vibration response.When the running speed is 115 km/h,the ground vibration response caused by different train formation(8 or 16)of CRH2A trains is almost the same.Train axle load is an important factor affecting the ground vibration response,and the greater the axle load,the greater the vibration response.
作者
司丕贤
尹学军
雷晓燕
SI Pixian;YIN Xuejun;LEI Xiaoyan(Engineering Research Center of Railway Environment Vibration and Noise,Ministry of Education,East China Jiaotong University,Nanchang 330013,China;Gerb(Qingdao)Vibration Control Co.,Ltd.,Qingdao 266108,Shandong,China)
出处
《噪声与振动控制》
CSCD
北大核心
2023年第2期214-221,共8页
Noise and Vibration Control
基金
国家自然科学基金资助项目(51978264)
江西省研究生创新专项基金资助项目(YC2020-S363,YC2021-S434)。
关键词
振动与波
高速列车
路基段
环境振动
现场试验
vibration and wave
high-speed train
subgrade section
environmental vibration
field measurement
