During the grinding train operation process,the grinding force between the grinding wheel and the rail is critical in ensuring the grinding quality and efficiency.The coupling vibration among the frame,the grinding wh...During the grinding train operation process,the grinding force between the grinding wheel and the rail is critical in ensuring the grinding quality and efficiency.The coupling vibration among the frame,the grinding wheels,and the wheelsets will seriously affect the stability of the grinding force.In this paper,the coupled mechanical model of the grinding wheel/rail is established based on the contact mechanics theory,which is embedded as a submodel into the dynamic model of the multi-rigid buggy.The interaction among the frame,the grinding wheels and the wheelsets is analysed by setting the convex irregularity on the rail.The grinding effect is evaluated in combination with the subway’s long wave corrugation grinding conditions.The results show that when the grinding buggy passes the convex irregularity,the vibration excited by the wheelset system has a significant impact on the dynamic behavior of the grinding wheels.The vibration of the grinding wheel is mainly transmitted between the grinding wheel and the frame,less affecting the wheelset.For the long wave corrugation of the subway,the grinding effect of the grinding wheel has a certain correlation with the phase angle of the wheelset through the corrugation.The research results provide an important reference for the setting of the grinding pattern.展开更多
通过自行式气压焊轨车多种施工方案的演练、分析和优化,制定了自行式气压焊轨车工艺调试、人员组织、线上线下焊接现场作业的方法及安全卡控措施;根据型式试验数据,形成焊接接头质量判定依据;对接头质量有重要影响的工艺参数,如气体流...通过自行式气压焊轨车多种施工方案的演练、分析和优化,制定了自行式气压焊轨车工艺调试、人员组织、线上线下焊接现场作业的方法及安全卡控措施;根据型式试验数据,形成焊接接头质量判定依据;对接头质量有重要影响的工艺参数,如气体流量、加热时间、顶锻压力、顶锻量数据需进行质量判定;通过阻力计算,可知在线下焊接和线上联焊时,焊机在满足向焊缝施加恒定的压力300 k N之外,同时也能满足可能需要承受的外部阻力。展开更多
基金Supported by National Natural Science Foundation of China(Grant No.52475137)Sichuan Provincial Science and Technology Program(Grant No.2024YFHZ0280)Sichuan Provincial Nature and Science Foundation Innovation Research Group Project(Grant No.2023NSFSC1975).
文摘During the grinding train operation process,the grinding force between the grinding wheel and the rail is critical in ensuring the grinding quality and efficiency.The coupling vibration among the frame,the grinding wheels,and the wheelsets will seriously affect the stability of the grinding force.In this paper,the coupled mechanical model of the grinding wheel/rail is established based on the contact mechanics theory,which is embedded as a submodel into the dynamic model of the multi-rigid buggy.The interaction among the frame,the grinding wheels and the wheelsets is analysed by setting the convex irregularity on the rail.The grinding effect is evaluated in combination with the subway’s long wave corrugation grinding conditions.The results show that when the grinding buggy passes the convex irregularity,the vibration excited by the wheelset system has a significant impact on the dynamic behavior of the grinding wheels.The vibration of the grinding wheel is mainly transmitted between the grinding wheel and the frame,less affecting the wheelset.For the long wave corrugation of the subway,the grinding effect of the grinding wheel has a certain correlation with the phase angle of the wheelset through the corrugation.The research results provide an important reference for the setting of the grinding pattern.
文摘通过自行式气压焊轨车多种施工方案的演练、分析和优化,制定了自行式气压焊轨车工艺调试、人员组织、线上线下焊接现场作业的方法及安全卡控措施;根据型式试验数据,形成焊接接头质量判定依据;对接头质量有重要影响的工艺参数,如气体流量、加热时间、顶锻压力、顶锻量数据需进行质量判定;通过阻力计算,可知在线下焊接和线上联焊时,焊机在满足向焊缝施加恒定的压力300 k N之外,同时也能满足可能需要承受的外部阻力。
