摘要
针对轨道交通槽形梁局部振动的问题,基于有限元理论,建立轨道交通槽形梁有限元模型。对其进行模态分析,再基于车辆-轨道耦合动力学理论,计算槽形梁在列车荷载作用下的局部振动响应,通过对选取的5个输出点的加速度频谱曲线进行分析。研究结果表明:槽形梁翼缘板的横向振动响应最大,最大的加速度振级为107.2 d B。槽形梁底板的垂向振动加速度在50 Hz处有峰值,左右两边的翼缘板和腹板的横向振动响应频谱曲线相类似,都在12.5 Hz和40 Hz处有峰值。通过槽形梁结构参数对槽形梁局部振动响应的敏感性分析,表明加厚底板厚度能够很好地降低槽形梁的振动响应。但并非越厚越好,其最佳值还有待进一步分析。
For local vibration problems of rail channel beam, based on the finite element method, the railwaychannel beam finite element model was established, and the modal analysis was carried out firstly. Then, based onthe theory of vehicle-track coupling dynamics, the local channel beam in vibration under train load response wascalculated through analysis of the acceleration spectrum curve of five selected output points to obtain themaximum response of transverse vibration of beam flange groove. The maximum acceleration vibration level wasfound to be 107.2 dB. The vertical beam bottom groove to the vibration acceleration is at 50Hz peak, thetransverse vibration of the left and right sides of the flange and web of the response spectrum curve is similar tothat of a peak at 12.5 Hz and 40 Hz. In addition, the sensitivity analysis on the local vibration response of thegroove beam was also studied. The results show that the thickness of the thickened bottom plate can reduce thevibration response of the groove beam effectively. Greater thickness is not always better, and the best valueremains to be further analyzed yet.
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2017年第11期2363-2368,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51268014
51578238)
江西省"赣鄱英才555工程"领军人才培养计划资助项目
江西省研究生创新专项资金资助项目(YC2016-S248)
关键词
槽形梁
有限元
局部振动
敏感性分析
trough beam
finite element
local vibration
sensitivity analysis
