Abstract:

The welding seam of the upper tensilerods safety hangers of GQ70 light oiltank truck may split easily during the operation. But the safety hangers usually bear small load, and its failure is not a material strength problem. The modal test with hammering method is carried out at some key portions of the safety hangers. Using experimental modal analysis method, the modal frequencies of the hangers are found. Through comparative analysis, the cause of splitting of the hangers is found, and some suggestions for repairing are proposed.

Key words: vibration and wave, safety hangers, modal analysis, hammering method, frequency

摘要： GQ70型轻油罐车上拉杆安全吊在车辆运行过程中经常发生焊缝开裂。安全吊不承受大载荷，可排除强度断裂原因。运用试验模态分析的方法，对关键部位安全吊进行锤击法模态试验，找出各个安全吊模态频率，并经过对比分析找出易裂部分安全吊焊缝开裂原因，提出改进建议。

关键词: 振动与波, 安全吊, 模态分析, 锤击法, 频率