刚性接触网腕臂型支持装置是刚性接触网重要的支撑部件，在实际工作中，随着弓网动态接触力的变化，支持装置承受着复杂多变的载荷，因此要求其具有较高的的可靠性。为研究刚性接触网腕臂型支持装置的振动特性及其结构优化，通过腕臂型支持装置的有限元分析，确定其应力最大点，并通过模态分析，提取了腕臂型支持装置的固有频率与振型。其次通过动态应力采集试验，结合有限元分析结果，确定其易发生疲劳故障部位，并进行了振动特性分析。最后针对振动分析和模态分析结果，并基于腕臂型支持装置零部件厚度与刚度的区间不连续的变化方法，以提高1阶固有频率为目标，对其进行了结构优化与验证。结果表明，随着厚度的增加，腕臂型支持装置的固有频率相应增加，优化后的腕臂型支持装置1阶扭转频率由16.75 Hz提高到22.40 Hz，远离弓网动态抬升力信号振动频率，显著改善了腕臂型支持装置的扭转振型。

The overhead rigid catenary cantilever support device is an important support component of the overhead rigid catenary.In actual work, with the change of the dynamic contact force of the pantograph-catenary, the support device is subjected to complex and variable loads, so it is required to have a high reliability.In order to study the vibration characteristics analysis and structural optimization of the overhead rigid catenary cantilever support device, this paper firstly determined the maximum stress point by the finite element analysis of the cantilever support device, and extracted the natural frequency and mode shape of the cantilever support device by modal analysis.Secondly, a dynamic stress collection test combined with the results of finite element analysis was used to determine its prone to fatigue failure parts, and analyze vibration characteristics.Finally, based on the results of vibration analysis and modal analysis, and based on the discontinuous variation of the thickness and stiffness of the components of the cantilever support device, the structure was optimized and verified with the goal of increasing the first-order natural frequency.The results show that as the thickness increases, the natural frequency of the cantilever support device increases correspondingly.The optimized torsion frequency of the cantilever support device increases from 16.75 Hz to 22.40 Hz, away from the vibration frequency of the dynamic lift signal of the pantograph-catenary.This significantly improved the torsional vibration shape of the arm support device.