中文摘要：

为了更深入地了解接触导线高度不平顺特性，基于相干分析，研究了接触导线高度不平顺不利波长区间．将国内高铁线路实测接触导线高度不平顺数据作为激扰引入弓网耦合动力学模型中，经仿真计算得到不同速度等级下弓网间接触力的统计量．对弓网间接触力与接触导线不平顺作相干分析，研究不同速度等级下影响弓网耦合接触的不平顺不利波长区间和最不利波长．结合分析接触线导高不平顺谱，探讨了不利波长的产生原因．研究结果表明，接触导线高度不平顺最不利波长一般为跨距或者2倍吊弦间距长．

英文摘要：

To understand the uneven characteristics of the contact wire height, the detrimental wavelengths of contact wire height irregularity were investigated based on coherence analysis. The contact wire height irregularity data measured from a Chinese high-speed rail line were introduced into the pantograph-catenary dynamic model as excitations. The statistics of the contact forces between the pantograph and the contact wire for different train speeds were calculated. The coherence calculation was made for analyzing the rela- tionship between the contact forces and the contact wire height irregularity, and the detrimental wave- lengths that influenced the contact of pantograph-catenary system were then determined. Combining the analysis of the contact wire height irregularity spectrum, causes of detrimental wavelengths were investiga- ted. Numerical results show that the most detrimental wavelength of the contact wire height irregularity is generally equal to span length or double dropper spacing.