受电弓是电力机车从牵引供电系统获取能源的唯一通道，受电弓滑板材料的载流摩擦学特性决定了弓网电流传输的能力和质量。弓网之间的动态接触行为使得滑板表面摩擦接触和导电接触始终处于波动状态，成为弓网安全事故的主要诱因之一。然而，目前大部分载流摩擦学研究仍建立在静态加载基础之上，动态接触影响下的载流摩擦学研究尚不成熟。所以，开展弓网振动影响下受电弓滑板材料的载流摩擦学特性研究，对于电力机车的安全稳定运行具有重要的理论意义和工程价值。本文具体研究内容如下： 1．建立受电弓和接触网耦合系统模型，通过有限元分析获得弓网之间的动态接触力。将本文动态接触力计算结果与EN50318计算结果进行比较，验证本文弓网动力学模型的合理性和正确性。为后续开展弓网振动影响下的纯碳滑板材料载流摩擦学性能试验研究提供理论依据。 2．采用自主研发的HST-100型销-盘式载流摩擦磨损试验机，用正弦波加载的方式模拟弓网振动，开展铬青铜／纯碳配副的载流摩擦学试验研究。进行载流条件下的动态加载精度测量，验证HST-100型载流摩擦磨损试验机的柔性加载能力。 3．根据弓网动力学仿真结果，设计耦合工况(振动幅值B和振动频率f同时升高)、变幅(B逐渐增加，f不变)和变频(f逐渐增加，B不变)工况及随机动态加载工况下的载流摩擦学试验。分别研究弓网振动及动态接触特征分量对纯碳滑板材料载流摩擦学性能的影响。 4．捕捉载流摩擦过程中的电弧光强和燃弧形态，总结动态加载条件下纯碳滑板的燃弧特性。采用扫描电镜(SEM)、能谱仪(EDS)、三维形貌仪和X射线光电子能谱仪(XPS)对纯碳滑板进行磨损表面微观形貌、磨屑特征及烧蚀产物成分分析。 本文耦合工况下的载流摩擦学试验研究结果表明，低速动态接触工况下，纯碳滑板损伤以机械磨损为主；高速动态接触工况下，滑板损伤以电弧侵蚀为主；80㎞／h动态接触工况下，接触表面氧化膜的生成使得纯碳滑板获得最佳摩擦磨损性能。纯碳滑板的电弧放电具有与动态接触力相似的周期性波动规律，是导致滑板材料性能演变的关键因素。电弧放电引发电流畸变，破坏了弓网电流传输的连续性和稳定性。 变幅工况下的载流摩擦学试验研究结果表明，提高动态接触力振动幅值会削弱弓网系统的接触稳定性，诱发电弧放电，导致纯碳滑板燃弧率升高、弓网载流质量下降。电弧烧蚀恶化材料表面质量，诱发裂纹的萌生和扩展及材料剥落，降低纯碳滑板的摩擦磨损性能；变频工况下的载流摩擦学试验研究结果表明，80㎞／h动态接触工况下，加快动态接触力振动频率有助于滑板表面氧化膜的生成和生长，有效地提高了纯碳滑板的表面质量和摩擦磨损性能。 本文建立了弓网系统的有限元模型，计算了不同滑动速度下弓网之间的动态接触力，将弓网动力学研究结果与载流摩擦学试验相结合，进行了动态加载条件下的载流摩擦学试验。根据试验结果总结了弓网振动对纯碳滑板材料摩擦磨损性能、载流质量及电弧放电特性的影响规律。本文的研究工作揭示了动态接触与纯碳滑板材料损伤和性能演变之间的关联关系，相关研究结果有望丰富弓网载流摩擦学理论，为电气化铁路弓网摩擦副材料的改进和应用及列车运行的安全性提供理论支撑。 关键词：弓网振动，纯碳滑板，载流，磨损，电弧 本研究得到国家自然科学基金项目(No.51775173、No．51405134和No．51375147)的资助。

 Pantograph is the only way for the electrical locomotives to get energy from the traction power supply system. Triboiogical properties of the strip decided the capacity and quality of the current transmission between the pantograph and the contact wire. Vibration leaded to unstable contact of rubbing with electric conduction, which became one of the incentives leading to pantograph/catenary system incidents. However, most of the present triboiogical studies were based on static contact. Therefore, triboiogical studies of the pure carbon strip subjected to dynamic contact force had important theory significance and project value for the safe and steady operation of electric locomotives. The main contents in this paper are as follows: 1.The dynamic mold of pantograph/catenary system was founded, by which dynamic contact force between the pantograph and contact wire was calculated. All the results were compared with EN50318. which verified the reasonableness and correctness of the mold in this paper. The calculated dynamic contact force was finally used to provide theoretical basis for the following triboiogical studies with current-carrying sliding under vibration. 2.Triboiogical experiments were carried out on a home-made pin-on-disk tribometer (HST-100), with which sine waves were loaded from pin (pure carbon) to disk (QCr0.5) to simulate the dynamic contact in pantograph/catenary system. Loading accuracy of the tribometer with current subjected to dynamic contact force was tested to verify its flexible loading capacities. 3.Triboiogical experiments were designed based on previous dynamic study. Firstly, coupling working condition experiments were completed with amplitude (B) and frequency (f) increased simultaneously. Secondly, amplitude experiments were carried out with varying B and frequency experiments were carried out with varying f. Thirdly, tests were conducted with random B and f. Finally, triboiogical properties of the pure carbon strip subjected to dynamic contact force with current-carrying sliding were discussed. 4.Arcing intensity and arcing morphology during the experiments were captured. Arcing properties of the pure carbon strip affected by dynamic contact force were summarized at last. Surface morphology of the strips, chemical composition of the wear debris and ablation products were detected by SEM, EDS, 3D Surface Profiler and XPS. Triboiogical experiments in coupling working condition showed that mechanical wear leaded the wear mechanism at lower velocity. And arc erosion became the dominant wear mechanism at faster velocity. What was special, oxidation film was generated at 80㎞/h which leaded to the best friction and wear properties. Arc discharges of the pure carbon strip fluctuated periodically according to the vibration of dynamic contact force. It was the dominant factor which leaded to the properties evolution of the strip. Arc discharges induced current distortion, which destroyed the consistency and stability of the current between the pantograph and the catenary. Tribological experiments with varying amplitude showed that contact stability in pantograph/catenary system was weakened by the increasing B. It leaded to the raise of arcing rate which resulted in the decrease of current-carrying quality. Arc erosion deteriorated surface quality of the pure carbon strip, leaded to the production and extension of cracks, induced material spalling. Therefore, friction and wear properties of the strip were decreased. On the other hand, tribological experiments with varying frequency showed that the increasing / at 80㎞/h contributed to the generation of oxidation film, which improved the surface quality of the worn surface. Friction and wear properties of the pure carbon strip were increased efficiently. The dynamic model of pantograph/catenary system with finite element method was founded in this paper. Dynamic contact force between pantograph and contact wire at different velocity was calculated, which was then used to study the tribological properties of the pure carbon strip in tribological experiments. At last, the friction and wear properties, current-carrying quality and arc discharges were summarized according to the test results. This paper revealed the relationship of dynamic contact force and material damage with properties evolution. It is expected to enrich the tribological theory of pantograph/catenary system, provide theoretical support for the improvement and application of pantograph/catenary materials and improve the safety of the locomotives. Key words: Pantograph/Catenary vibration; Pure carbon strip; Current-carrying; Wear; Arc discharge The present work is supported by the fund of the National Natural Science Foundation of China (Project No: 51775173, 51405134 and 51375147).