高速铁路接触线不平顺线谱研究

Study on the Contact Wire Unevenness of High-speed Railway

功率谱密度函数可以从波长和幅值两方面反应接触线不平顺的特征和规律,是研究接触线不平顺状态的重要工具。本文以我国多条高速铁路线路的接触线垂向不平顺实测数据为基础,采用最大熵谱估计得到接触线不平顺实测功率谱,并提出一种普适性强、结构简单的不平顺线谱模型。研究结果表明:我国高速铁路线路的PSD最值均小于0.01m2/m-1,接触线整体不平顺状态较好;随机不平顺中含有的周期性简谐波成分,波长主要为单倍跨距和单倍吊弦距;文中建立的接触线不平顺线谱新模型参数少、普适性强、拟合效果优,并给出该模型参数的非线性最小二乘估算结果。

Power spectral density function is an important tool for studying the state of unevenness.It reflects the characteristics and laws of contact wire unevenness in wavelength and amplitude.The contact wire unevenness was measured in this paper.And maximum entropy spectrum estimation was applied for the power spectral density.A new unevenness spectrum model with universality and concise form was putted forward.The results indicate that,the condition of contact wires is good,as the maximum of PSD is lower than 0.01m^2/m^-1.Periodic wave is contained in the contact wire unevenness.The main wavelengths are span length and dropper spacing.The new unevenness spectrum model has the advantages of few parameters,much applicability and excellent fitting effect.The parameters of new model were estimated by nonlinear least square method.