铁道学报
鐵道學報
철도학보
2015年
2期
34-38
,共5页
高速铁路%接触线不平顺%功率谱密度%最大熵谱估计
高速鐵路%接觸線不平順%功率譜密度%最大熵譜估計
고속철로%접촉선불평순%공솔보밀도%최대적보고계
high-speed train%contact wire unevenness%power spectral density%maximum entropy spectrum estimation
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0.01 m2／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。
功率譜密度函數可以從波長和幅值兩方麵反應接觸線不平順的特徵和規律，是研究接觸線不平順狀態的重要工具。本文以我國多條高速鐵路線路的接觸線垂嚮不平順實測數據為基礎，採用最大熵譜估計得到接觸線不平順實測功率譜，併提齣一種普適性彊、結構簡單的不平順線譜模型。研究結果錶明：我國高速鐵路線路的PSD最值均小于0.01 m2／m－1，接觸線整體不平順狀態較好；隨機不平順中含有的週期性簡諧波成分，波長主要為單倍跨距和單倍弔絃距；文中建立的接觸線不平順線譜新模型參數少、普適性彊、擬閤效果優，併給齣該模型參數的非線性最小二乘估算結果。
공솔보밀도함수가이종파장화폭치량방면반응접촉선불평순적특정화규률，시연구접촉선불평순상태적중요공구。본문이아국다조고속철로선로적접촉선수향불평순실측수거위기출，채용최대적보고계득도접촉선불평순실측공솔보，병제출일충보괄성강、결구간단적불평순선보모형。연구결과표명：아국고속철로선로적PSD최치균소우0.01 m2／m－1，접촉선정체불평순상태교호；수궤불평순중함유적주기성간해파성분，파장주요위단배과거화단배조현거；문중건립적접촉선불평순선보신모형삼수소、보괄성강、의합효과우，병급출해모형삼수적비선성최소이승고산결과。
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 uneven‐ness was measured in this paper . And maximum entropy spectrum estimation was applied for the power spec‐tral 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 0.01 m2/m-1 .Pe‐riodic 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 .
