Wind Tunnel Test of Tension Effects on Vibration Responses of Catenary System
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摘要: 接触线和承力索的张力对接触网系统的风振响应有重要的影响，为此进行了气弹模型风洞试验. 以实际铁路工程为背景，根据接触网系统的设计要求，按照气动弹性相似理论制作了接触网系统的5柱4跨模型，并根据接触线、承力索张力的4种组合情况进行了气动弹性模型风洞试验，得到了支柱、腕臂结构及接触线上的加速度和位移响应，研究了在紊流场下结构的风振响应特征. 试验结果表明，接触线与承力索张力越大，接触线自振频率越大，且其风偏越小；腕臂及支柱结构受张力影响较小；接触网系统为风敏感结构，提高接触线、承力索张力可有效控制风偏.Abstract: The tensions of contact wire and messenger wire are important to the wind-induced vibration responses of a catenary system. Based on the design of an actual railway project, a five-post and four-span aero-elastic catenary system model for a wind tunnel test was designed according to the similarity theory. A wind tunnel test on the aero-elastic catenary system model with four different types of contact wire and messenger wire tension combinations was carried out. The characteristics of the wind-induced vibration responses were studied by the measured acceleration and displacement responses in the test. The results demonstrated that the natural frequency of the contact wire increased, and its wind deflection decreased with the increase in the tensions on the contact wire. The cantilever and the mast were hardly influenced by the tensions on the wires. The catenary system is a wind-sensitive structure. It is an effective method for decreasing the wind deflection on the contact wire by increasing the tensions on the contact wire and the messenger wire.
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Key words:
- railway system /
- catenary system /
- wind tunnel test /
- tension /
- wind-induced vibration responses
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图 1 平均风速剖面和顺风向湍流度剖面
Figure 1. Average wind speed profile and turbulence intensity profile
图 5 147 N接触线张力下导线跨中位移功率谱
Figure 5. Displacement power spectrum of the mid span under a contact wire tension of 147 N
图 6 147 N接触线张力下挂线点加速度功率谱
Figure 6. Acceleration power spectrum of the hanging point under a contact wire tension of 147 N
图 8 挂线点顺风向位移峰值
Figure 8. Maximum displacement of the hanging point along the wind direction
图 9 挂线点顺风向加速度峰值
Figure 9. Maximum acceleration of the hanging point along the wind direction
图 10 柱顶顺风向位移峰值
Figure 10. Maximum displacement on the top of the mast along the wind direction
表 1 模型设计的参数相似比
Table 1. Main similarity parameters for model design
模型 相似参数 相似比取值 风场 风速相似比λU 1/2.12 腕臂及支柱结构 位移相似比λL 1/4.50 加速度相似比λa 1.00 线质量相似比λm 1/20.25 拉伸刚度相似比λEA 1/91.13 频率相似比λf 2.12 线索体系 跨度相似比 $\lambda_{\rm L}^* $ 1/10.00 加速度相似比 $\lambda_{\rm a}^* $ 0.45 线质量相似比 $\lambda_{\rm m}^* $ 1/9.11 拉伸刚度相似比 $\lambda_{\rm EA}^* $ 1/202.50 频率相似比 $\lambda_{\rm f}^* $ 2.21 位移相似比 $\lambda_{\rm S}^* $ 1/4.50 线索张力相似比 $\lambda_{\rm N}^* $ 1/202.50 
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表 2 风振响应的参数相似比
Table 2. Similarity parameters for wind response
相似参数 相似比取值 频率相似比 $\lambda_{\rm f}^* $ =λf 2.12 结构位移相似比λL 1/4.50 结构加速度相似比λa 1.00 导线位移相似比 $\lambda_{\rm S}^* $ 1/4.50
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