Finite Element Model for Catenary in Initial Equilibrium State
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摘要: 为准确和快速地计算接触网初始平衡状态的吊弦长度、静态刚度、固有频率和模态振型,分别用索单元和梁单元建立了接触网有限元模型.结果表明:单元类型的选择对接触网静态和动态的结果影响可忽略不计;索单元的自由度数目少,可提高计算效率;计算静态刚度和模态振型时,需先确定接触网平衡位置且考虑单元轴向刚度.Abstract: Finite element models were established using link and beam elements,respectively,to accurately and quickly calculate the dropper lengths,static stiffness,natural frequencies and mode shapes of catenaries in the initial equilibrium state.The results show that the two element types exert no obvious effect on the static and dynamic simulation results;the calculation efficiency can be improved using the link elements due to their fewer freedom degrees;the equilibrium positions and the axial stiffness of the elements should be determined in advance when the static stiffness and mode shapes are calculated.
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Key words:
- catenary /
- finite element /
- initial equilibrium /
- link element /
- beam element
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