摘要
针对连续介质振动体上的弹性波,提出由时空坐标下仿真位移等值线图识别波速的方法,并利用欧拉梁波速的理论计算和仿真识别结果对该方法的有效性进行验证,表明位移等值线图能够识别弹性波的波速,可将其应用于接触网波速的识别。以某3跨接触网为例,由仿真位移等值线图得到其波速,再采用摄影测量设备进行多工况下波速测量试验,验证提出的波速识别方法的准确性,并将实测波速与基于欧拉梁或弦理论、视整体接触网为单根接触线时得到的理论波速进行对比分析。结果表明:基于仿真位移等值线图识别接触网波速的方法是可行的,识别精度在2%以内;接触网的实测波速约为139.98m·s^(-1),而基于欧拉梁或弦理论、用单根接触线的波速近似接触网波速时偏大13.23%;提出的波速识别方法能够为接触网的结构参数设计提供简洁、有效的验证手段。
For the elastic wave on the vibrating body of a continuous medium,a method for identifying the wave velocity by simulating displacement contour map in time-space coordinates was proposed.The effectiveness of the method was verified by the theoretical calculation and simulation recognition results of Euler beam wave velocity,which showed that the displacement contour map could identify the velocity of elastic wave and could be applied to the identification of catenary wave velocity.Taking a 3-span catenary as an example,the contour map of simulated displacement was firstly adopted to identify its wave velocity.Then,the photogrammetric equipment was used to test the wave velocity under multiple working conditions to verify the accuracy of the proposed method for wave velocity recognition.Moreover,the measured wave velocity was compared with the theoretical wave velocity obtained by regarding the integral catenary as a single contact wire according to Euler beam or string theory.Results show that,identifying the catenary wave velocity by the contour map of simulated displacement is feasible,and the recognition accuracy is within 2%.The measured catenary wave velocity is about 139.98 m·s-（-1）,while the theoretical wave velocity obtained by regarding the integral catenary as a single contact wire based on Euler beam or string theory is 13.23% larger.The proposed method for wave velocity identification can provide simple and effective verification means for the design of catenary structure parameters.
作者
莫志刚
邹栋
周宁
MO Zhigang;ZOU Dong;ZHOU Ning(School of Civil Engineering ＆ Mechanics,Huazhong University of Science and Technology,Wuhan Hubei 430074,China;State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu Sichuan 610031,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2018年第4期107-113,共7页
China Railway Science
基金
国家"十三五"重点研发计划先进轨道交通重点专项项目(2016YFB1200401-102B
2016YFB1200506)
关键词
接触网
弹性波
波速
位移等值线图
接触线
弹性振动
Catenary
Flexural wave
Wave velocity
Contour plot of displacement
Contact wire
Elastic vibration
