摘要
针对80 km/h钢轨探伤车B显数据中接头处二孔侧上方偏斜70°通道异常出波问题,以60 kg/m钢轨接头处B显数据为对象,分析了偏斜70°在接头处的出波特征,开展了前后轮直打70°发射、中间轮偏斜70°接收的超声声学推算及试验验证。结果表明,直打70°发射的超声波经接头端面、轨颚和踏面多次反射最终被偏斜70°接收,导致形成偏斜70°出波点群。结合一处近乎垂直的轨头横向裂纹附近偏斜70°出波给出伤损判定应用建议。结果表明,若探伤车B显数据中偏斜70°出波点群符合单通道偏斜70°二次波声程范围内出波且形成走势、出波水平位置距离近乎垂直的轨头横向裂纹约230~250 mm等特征时,不宜对其作伤损报警处理。利用本文方法可避免将该类型偏斜70°出波报告为伤损报警,进而提高探伤车伤损报警的准确率。
In view of the abnormal outgoing wave problem of the 70° deflection channel above the two hole side of the joint in the B-display data of the 80 km/h rail flaw detection car,taking the B-display data at the 60 kg/m rail joint as the object,the outgoing wave characteristics of the 70° deflection at the joint were analyzed,and the ultrasonic acoustic calculation and experimental verification of the direct 70° transmission of the front and rear wheels and the reception of the middle wheel with 70° deflection were carried out. The results show that the ultrasonic wave emitted by the direct 70° is finally received by the 70° deflection through multiple reflections of the joint end face,rail jaw and tread,resulting in the formation of outgoing wave point group with a deflection of 70°. Combined with a nearly vertical 70°deflection outgoing wave near the rail head lateral crack,the application suggestion of damage judgment was given. The results show that if the 70° deflection outgoing wave point group within the B-display data of the flaw detection car conforms to the characteristics of wave outgoing within the second wave path range of single channel of 70° deflection and forming the trend,and the horizontal position of outgoing wave being about 230~250 mm away from the nearly vertical transverse crack of the rail head,it is not suitable to give a damage alarm. This method can avoid reporting this type of 70°deflection wave as damage alarm,and then improve the accuracy of damage alarm of flaw detection car.
作者
马运忠
马铁雷
张玉华
李培
李忠
MA Yunzhong;MA Tielei;ZHANG Yuhua;LI Pei;LI Zhong(Infrastructure Inspection Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China;Shenyang Track Maintenance Machinery Division,China Railway Shenyang Group Co.Ltd.,Shenyang 110032,China;Beijing IMAP Technology Co.Ltd.,Beijing 100081,China)
出处
《铁道建筑》
北大核心
2022年第3期39-42,共4页
Railway Engineering
基金
国家重点研发计划科技助力经济2020重点专项(2020YFF01015400ZL)
中国国家铁路集团有限公司科技研究开发计划(P2019G025)
中国铁道科学研究院集团有限公司基金(2020YJ153)。
关键词
钢轨探伤车
超声波探伤
声学计算
偏斜70°出波
伤损报警
rail flaw detection car
ultrasonic wave detection
acoustic calculation
70°deflection outgoing wave
injury alarm
