某高速受电弓上框架长期服役后模态特性研究

Study on Modal Characteristics of a High-speed Pantograph Frame after Long-term Service

高速列车在运行过程中速度、加速度的变化以及其他的一些诱因,会使受电弓在服役过程中产生共振,可能导致受流质量的降低和弓网离线等严重问题。对受电弓进行模态试验,获得其固有频率和模态振型,对受电弓的安装以及后续的优化设计有着重要的指导作用。针对某型高速受电弓,通过DHDAS软件平台,分别对长期服役后有、无裂纹的两个受电弓上框架进行模态试验,获得其固有频率和模态振型,试验结果表明:裂纹的产生对上框架的振动特性有一定的影响。

The variation of speed and acceleration and some other inducements in the running process of high-speed train will cause resonance of pantograph in the service process,which may lead to serious problems such as the reduction of current quality and the offline of pantograph catenary.The modal experiment of the pantograph is conducted to obtain its natural frequency and modal shape,which have an important guiding role for the installation of the pantograph and the subsequent optimization design.Based on a certain type of high-speed pantograph and through DHDAS software platform,modal experiments are carried out on two pantograph upper frames with cracks after long-term service to gain their natural frequencies and modal shapes.The experimental results show that the cracks have a certain impact on the vibration characteristics of the upper frame.