铁道学报
鐵道學報
철도학보
2014年
9期
20-27
,共8页
宋洋%刘志刚%汪宏睿
宋洋%劉誌剛%汪宏睿
송양%류지강%왕굉예
覆冰接触线%气动力参数%风偏%接触线风振%平均风%脉动风
覆冰接觸線%氣動力參數%風偏%接觸線風振%平均風%脈動風
복빙접촉선%기동력삼수%풍편%접촉선풍진%평균풍%맥동풍
iced contact wire%aerodynamic parameter%wind deviation%wind vibration of contact wire%static wind%fluctuating wind
为分析高速铁路接触网线索覆冰对接触线风振响应的影响，首先采用流体力学计算软件 Fluent 对不同覆冰厚度的接触线进行绕流仿真，分析覆冰对接触线气动系数的影响，然后对作用在接触网上的平均风和脉动风载荷进行计算和仿真，用有限元分析软件 MSC-Marc建立高速铁路接触网有限元模型。最后，分别将平均风和脉动风载荷施加到有限元模型中，研究不同覆冰厚度对接触线风致振动响应的影响。研究结果表明：接触线覆冰对其气动参数影响较大；高速铁路接触网风振主要由脉动风引起；线索覆冰厚度增加会导致接触线的风偏增大，也会改变接触线的风振形式；覆冰接触线的振幅随覆冰厚度的增加而增大。因此，应避免线索覆冰对高速铁路接触网系统的危害。
為分析高速鐵路接觸網線索覆冰對接觸線風振響應的影響，首先採用流體力學計算軟件 Fluent 對不同覆冰厚度的接觸線進行繞流倣真，分析覆冰對接觸線氣動繫數的影響，然後對作用在接觸網上的平均風和脈動風載荷進行計算和倣真，用有限元分析軟件 MSC-Marc建立高速鐵路接觸網有限元模型。最後，分彆將平均風和脈動風載荷施加到有限元模型中，研究不同覆冰厚度對接觸線風緻振動響應的影響。研究結果錶明：接觸線覆冰對其氣動參數影響較大；高速鐵路接觸網風振主要由脈動風引起；線索覆冰厚度增加會導緻接觸線的風偏增大，也會改變接觸線的風振形式；覆冰接觸線的振幅隨覆冰厚度的增加而增大。因此，應避免線索覆冰對高速鐵路接觸網繫統的危害。
위분석고속철로접촉망선색복빙대접촉선풍진향응적영향，수선채용류체역학계산연건 Fluent 대불동복빙후도적접촉선진행요류방진，분석복빙대접촉선기동계수적영향，연후대작용재접촉망상적평균풍화맥동풍재하진행계산화방진，용유한원분석연건 MSC-Marc건립고속철로접촉망유한원모형。최후，분별장평균풍화맥동풍재하시가도유한원모형중，연구불동복빙후도대접촉선풍치진동향응적영향。연구결과표명：접촉선복빙대기기동삼수영향교대；고속철로접촉망풍진주요유맥동풍인기；선색복빙후도증가회도치접촉선적풍편증대，야회개변접촉선적풍진형식；복빙접촉선적진폭수복빙후도적증가이증대。인차，응피면선색복빙대고속철로접촉망계통적위해。
In order to investigate the influence of icing of contact wires on wind vibration responses of contact wires of catenary systems of high-speed railways,the computational Fluid dynamics software Fluent was adopt-ed to realize streaming simulation of sections of contact wires with different thicknesses of icing and to conduct analysis on the influence of icing on the aerodynamic parameters of the contact wires.The static wind loads and fluctuating wind loads exerted on the catenary were respectively deduced and simulated.The finite element model of the catenary system was established with Software MSC-Marc.Finally the static wind loads and fluc-tuating wind loads were introduced into the finite element model respectively to study the influence of different icing thicknesses on wind-induced vibration response of contact wires.The research results show as follows:Ic-ing of contact wires changes the relevant aerodynamic parameters largely;wind-induced vibrations of high-speed railway catenary are mainly caused by fluctuating winds;increasing of icing thicknesses of contact wires and carrier cables increase,wind deviations of contact wires and changes the wind vibration mode of contact wires;the vibration amplitudes of iced contact wires are enlarged with increasing of icing thicknesses.Damage of icing of wires and cables to the catenary system of high-speed railways should be avoided.
