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基于线路测试结果的转向架构架牵引电机振动试验载荷谱研究
Research on the vibration test load spectrum for bogie frame-mounted tractor motor based on on-track tests
- 机车电传动 2023年第1期 页码：13-18
- 作者机构：
中国铁道科学研究院集团有限公司 机车车辆研究所，北京 100081
- 作者简介：
郭力荣（1990—），男，博士，助理研究员，主要从事车辆动力学、结构强度和车辆检验检测技术研究；E-mail: jd_glr@163.com
- 基金信息：中国国家铁路集团有限公司系统性重大项目(P2020J024;P2021J003);中国铁道科学研究院集团有限公司重大项目(2021YJ262);中国铁道科学研究院集团有限公司青年专项(2022YJ266)
DOI：10.13890/j.issn.1000-128X.2023.01.002
中图分类号： U266.2纸质出版日期：2023-01-10，
收稿日期：2022-10-01，
修回日期：2022-12-26，
- 稿件说明：
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李国顺, 郭力荣, 陈璨, 等. 基于线路测试结果的转向架构架牵引电机振动试验载荷谱研究[J]. 机车电传动, 2023(1): 13-18.
LI Guoshun, GUO Lirong, CHEN Can, et al. Research on the vibration test load spectrum for bogie frame-mounted tractor motor based on on-track tests [J]. Electric Drive for Locomotives, 2023(1): 13-18.
李国顺, 郭力荣, 陈璨, 等. 基于线路测试结果的转向架构架牵引电机振动试验载荷谱研究[J]. 机车电传动, 2023(1): 13-18. DOI： 10.13890/j.issn.1000-128X.2023.01.002.
LI Guoshun, GUO Lirong, CHEN Can, et al. Research on the vibration test load spectrum for bogie frame-mounted tractor motor based on on-track tests [J]. Electric Drive for Locomotives, 2023(1): 13-18. DOI： 10.13890/j.issn.1000-128X.2023.01.002.
摘要
忽略对结构疲劳损伤贡献较小的高频信号和小幅循环的影响，对牵引电机振动载荷进行雨流计数处理，获得三维载荷谱。基于应力均值大于0的Haigh疲劳曲线，构建平均载荷修正方法，将三维载荷谱转换为二维载荷谱。将测试载荷谱扩展至全寿命运行里程，以载荷谱特征参数一致为准则，推断全寿命运行里程下的最大载荷幅值，确定全寿命载荷谱。参考FKM提供的方法，计算变幅循环系数，确定了对应变幅循环的等效恒幅载荷计算方法，构建构架牵引电机振动载荷疲劳试验的恒幅载荷谱。建立有限元分析模型，分别以全寿命里程下的变幅循环和构建的等效恒幅循环载荷谱作为输入，计算了构架电机安装座与横梁上盖板间焊接接头的疲劳强度。计算结果表明，变幅循环和等效恒幅循环载荷谱作用下的结构疲劳强度薄弱区域一致，节点材料利用率最大值分别为0.277 0和0.326 5。构建的等效恒幅循环载荷谱偏于保守，能够有效指导构架疲劳强度试验。
Abstract
Ignoring the effects of high-frequency signals and small-amplitude cycles that contribute little to structural fatigue damage
rainflow counting was performed on the vibration load of traction motors to generate a three-dimensional load spectrum. Based on the Haigh fatigue curve with a stress mean greater than 0
a mean load correction method was constructed to convert the three-dimensional load spectrum into a two-dimensional load spectrum. The test load spectrum was then extended across the life-cycle running mileage; the maximum load amplitude under the life-cycle running mileage was inferred depending on the consistency in the characteristic parameters of the load spectrum
to confirm the life-cycle load spectrum. Referring to the method defined in FKM
the variable amplitude cycle coefficient was calculated
the calculation method of the equivalent constant amplitude load was determined for the corresponding variable amplitude cycle
and the constant amplitude load spectrum was constructed for the vibration load fatigue test of the frame-mounted traction motor. A finite element model was established
and the fatigue strength at the welded joint between the motor seats and the cover plates of the transom was calculated by using the variable amplitude cycle over the life-cycle running mileage and the equivalent constant amplitude cycle load spectrum as the input respectively. The calculation results show that the weak areas of structural fatigue strength are consistent under the action of variable amplitude cycle and equivalent constant amplitude cyclic loading spectrum
and the maximum material utilizations are 0.277 0 and 0.326 5 at the joints
respectively. The equivalent constant amplitude cyclic loading spectrum established is conservative and can effectively guide the fatigue strength test of the frame.
关键词
电机振动载荷线路载荷测试变幅载荷循环等效恒幅循环构架转向架疲劳强度
Keywords
motor vibration loadon-track load testvariable amplitude load cycleequivalent constant amplitude cycleframebogiefatigue strength
references
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