计及覆冰和空气阻尼的弓网动态受流特性
Influences of Ice Load and Air Damping on Dynamic Current Collection of Pantograph-Iced Catenary

摘要： 为研究覆冰和环境风对弓网受流的影响,基于模态分析法,在充分考虑覆冰对接触网系统质量和刚度影响的基础下,重新推导了覆冰接触网运动微分方程,并引入静风载荷引起的空气阻尼对其进行修正.结合受电弓归算质量模型进行动态仿真计算,研究了不同覆冰厚度、风速、风攻角对弓网接触压力的影响.研究结果表明:无风时覆冰厚度的增加会造成弓网接触性能的变差;在静风环境下,由于线索覆冰改变了接触线阻尼,来流风向是静风载荷影响弓网接触性能的主要因素,来流风向越接近水平,对弓网受流性能的影响越小.
Abstract: In order to study the influences of the icing and environmental wind on pantograph-catenary current collection, based on modal analysis method, the differential equations of motion for icing catenary were deduced considering the influence of icing on the catenary mass and stiffness. Then pantograph-catenary equation of motion is adjusted by introducing the term of air damping caused by static wind load. Then, utilizing a lumped-mass pantograph model, the contact force with different ice thicknesses, wind speeds and angles of attack is calculated. The results show that without wind, the increase of ice thickness leads to a poor contact performance of pantograph-catenary system. When there is static wind load, the wind direction is the main factors affecting the contact performance of the pantograph-catenary system, because the aerodynamic damping of catenary is changed by icing. While the more closely the wind flows to the horizon direction, the less it affects the contact performance of pantograph-catenary system