Mechanical Characteristics of High-Speed Railway Catenary Cantilever System
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摘要: 为了解决高速铁路接触网腕臂疲劳裂纹及零部件脱落的难题进行了腕臂系统的力学特性研究. 建立了腕臂的实体有限元模型，研究了腕臂系统在风环境和覆冰影响下的静力学特性；采用模态分析，获得腕臂的固有频率和振型；基于变形方程，推导出腕臂系统载荷的传递函数，获得了腕臂上载荷的分布规律；通过台架试验验证了腕臂实体有限元模型的正确性. 研究结果表明：腕臂系统的最大位移均在定位线夹处；当覆冰载荷作用时，腕臂系统的最大应力点在斜腕臂和套管双耳连接的螺栓处；当静风荷载作用时，腕臂系统的最大应力点在定位线夹处.Abstract: In order to solve problems of parts’ fatigue cracks and falling off in the cantilever system for high-speed railway catenary, a study was conducted to investigate mechanical characteristics of the cantilever system. First, a finite element model of the cantilever system was established, whereby the static mechanical properties of the cantilever system were studied under different conditions of static wind load and icing load. Then, the modal analysis was performed to analyze the natural frequencies and mode shapes of the cantilever system. Based on the deformation equation, the transfer function of the load acting on the cantilever was derived, and the distribution rule of the force acting on cantilever brackets was obtained. Finally, the validity of the finite element model of the cantilever system was verified by a bench test. The result shows that the maximum displacement of the cantilever system occurs to the locating clamp. When the static wind load is applied, the maximum stress point of the cantilever system is at the joint-bolt of the inclined cantilever and the binaural casing. When the icing load is applied, however, the maximum stress point of the cantilever system is at the locating clamp.
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Key words:
- cantilever system /
- finite element method /
- modal analysis /
- transfer function /
- bench test
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图 3 不同工况下腕臂的有限元计算结果
Figure 3. Finite element calculation value of cantilever with different working conditions
图 4 腕臂系统前6阶模态振型
Figure 4. First six order vibration mode shape images of cantilever system
图 11 测点 ①、③、④、⑦ 仿真和试验结果对比
Figure 11. Comparison of simulation and test value of measuring points ①，③，④ and ⑦
表 1 腕臂载荷
Table 1. Cantilever load
N 条件 承力索座
水平负载承力索座
垂直负载定位线夹
水平负载定位线夹
垂直负载无环境荷载下 555 1082 640 120 30 m/s 风速下 1047 1082 1154 120 10 mm 覆冰厚度下 555 1809 640 120 综合覆冰和风载下 1515 1809 1576 120 
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表 2 腕臂前10阶固有频率
Table 2. First ten order natural frequencies of cantilever
Hz 阶数 频率 阶数 频率 1 4.230 6 20.912 2 6.110 7 21.097 3 9.503 8 26.182 4 12.494 9 36.978 5 17.178 10 43.694
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表 3 腕臂装置静态强度试验与仿真结果对比
Table 3. Comparison of static strength test and simulation results of cantilever
测试点 测试值/×10−6 计算值/×10−6 相对误差/% ① −10.98 −9.34 14.94 ② −0.23 −0.22 4.35 ③ 17.99 13.78 23.40 ④ 27.51 25.51 7.27 ⑤ 13.88 12.70 8.50 ⑥ 709.28 780.01 9.97 ⑦ −27.07 −24.80 8.39
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