摘要
轨道交通槽形梁结构在列车动载作用下会辐射低频噪声,这种低频噪声对人体健康危害很大。以轨道交通30 m简支槽形梁为研究对象,基于车桥耦合分析模型,利用有限元法和边界元法计算槽形梁结构辐射声功率。将响应面法与辐射声功率计算相结合,建立了以槽形梁辐射结构噪声在分析频率范围内的总声功率级为目标及以槽形梁质量为约束的声学优化模型,再利用序列二次规划法进行求解,最终找出了槽形梁结构声学最优的截面尺寸。优化后槽形梁底板厚度为0. 34 m,腹板厚度为0. 22 m。计算结果表明,利用响应面法可以有效的对槽形梁进行声学优化,而且优化后的降噪效果还是比较显著的。
The low frequency noise radiated by a trough girder under the dynamic load of trains is very harmful to human health.Taking a 30-m simply-supported trough girder for rail transit as the research object,based on the vehicle-bridge coupling analysis model,the sound power of rail transit trough girder was calculated by using the finite element method and the boundary element method.Then the response surface methodology and the calculation of sound power were combined,acoustic optimization model was established which takes total sound power in the range of analyzing frequency of the trough girder as the target and the quality of the trough girder as the constraint.Finally,the sequential quadratic programming was used to obtain the optimum section size of the trough girder.The thickness of the deck is 0.34m and the thickness of the web is 0.22m after acoustic optimization of trough girder.The results show that the response surface methodology can effectively optimize the structure-borne noise from a trough girder,and the effect of noise reduction is still significant after the optimization.
作者
刘林芽
秦佳良
雷晓燕
刘全民
宋瑞
LIU Linya;QIN Jialiang;LEI Xiaoyan;LIU Quanmin;SONG Rui(Engineering Research Center of Railway Environment Vibration and Noise,Ministry of Education, East China Jiaotong University,Nanchang 330013,China;College of Civil Engineering and Architecture,Nanchang Institute of Technology,Nanchang 330029,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第20期56-60,80,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(51578238
51608201)
江西省优势科技创新团队(20152BCB24007)
江西省研究生创新专项资金(YC2016-S248)
关键词
槽形梁
有限元法
边界元法
结构噪声
响应面法
声学优化
trough girder
finite element method
boundary element method
structure-borne noise
response surface methodology
acoustic optimization
