摘要
随着列车运行速度的提高,列车产生的噪声对周围环境产生的影响愈发严重。高速列车受电弓位于车顶,其产生的气动噪声成为高速列车主要噪声来源之一。选取某典型受电弓结构建立受电弓的流体及气动噪声的仿真分析模型,通过大涡模拟方法计算流场场量的分布特征及气动噪声大小。根据仿真分析结果研究受电弓气动噪声产生的机理,并在此基础上引入翼缘仿生结构对当前受电弓结构进行优化改进。研究结果表明,仿生优化后的受电弓能够有效降低受电弓尾涡脱落量,降低了气动噪声,并且其宽频噪声品质表现较好,具有比较良好的空气动力学性能。另外,优化后的受电弓适当的提高了受电弓的升力,可以减小跳网情况的发生,有助于受流稳定,具有一定的工程参考价值。
As the speed of the trains increases, the impact of train noise on the surrounding environment is more and more serious. The pantographs of the high-speed trains are located on the roof of the vehicles. Their aerodynamic noise is one of the main sources of noise of the high-speed trains. In this paper, the simulation analysis model of fluid and aerodynamic noise of a typical pantograph structure was built. The distribution characteristics of the flow field and the magnitude of the aerodynamic noise were calculated by the method of large eddy simulation. According to the results of simulation analysis, the mechanism of the aerodynamic noise of the pantographs was studied. On this basis, the bionic structure of the flange was introduced to optimize the current pantograph structure. The results show that the optimized pantograph can effectively reduce the amount of pantograph tail vortex shedding and the aerodynamic noise. Meanwhile, its wideband noise performance and aerodynamic performance are good. In addition, the optimized pantograph raises the contact force between the bow and the net and reduces the possibility of network jumping, which is helpful to the stability of the flow. These conclusions have certain engineering reference values.
作者
王洋洋
周劲松
宫岛
刘海涛
WANG Yangyang;ZHOU Jinsong;GONG Dao;LIU Haitao(Institute of Rail Transit, Tongji University, Shanghai 201800, China;School of Mechatronics & Vehicle Engineering, East China Jiaotong University, Nanchang 330013, China)
出处
《噪声与振动控制》
CSCD
2018年第A01期348-352,共5页
Noise and Vibration Control
基金
国家自然科学基金资助项目(51765017)
江西省自然科学基金资助项目(20161BAB216136)
江西省教育厅科技资助项目(GJJ150497)
关键词
声学
受电弓
流场分析
大涡模拟
气动噪声
仿生降噪
acoustics
pantograph
flow distribution analysis
large eddy simulation
aerodynamic noise
bionic noise reduction