接触线的疲劳可靠性

Fatigue Reliability of Contact Wire

根据接触悬挂系统中的接触线振动方程,推导了接触线应力的均值和方差的计算公式.综合考虑了接触线应力集中系数、尺寸系数、表面质量系数和材料疲劳强度的影响,得到了接触线疲劳极限的统计特征.应用数理统计原理建立了接触线疲劳可靠性分析的数学模型.分析结果表明,接触导线线质、张力和刚度以及列车运行速度、波动传播速度和抬升力是影响导线疲劳可靠性的主要因素.

Vibration equations of contact wires were used to derive the formulae for calculation of mean and standard deviations of stresses. Statistical characteristic of fatigue strength of contact wires was obtained by comprehensively considering such coefficients as stress concentration, size and surface quality. A mathematic model for fatigue reliability of contact wires was presented based on statistical principle. Analyses results show that the materials, tension and rigidity of wires, speed of trains, wave speed, and lift forces are primary factors that affect fatigue life of contact wires.