Flexible array eddy current testing of generator fan blades
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摘要: 以火电机组发电机风扇叶片为对象进行阵列涡流试验，通过研究检测频率、提离效应、扫查方向等变量对检测信号的影响，寻找合适的检测工艺，以替代传统的渗透检测。试验结果表明：火电机组发电机风扇叶片有效检测频率为300 kHz～1 400 kHz，与计算值吻合；风扇叶片上提离效应导致的信号降低可以通过增加增益补偿来解决；扫查方向对缺陷信号强度基本无影响。最后对发电机风扇叶片的阵列涡流现场检测应用提出了建议。Abstract: Taking the fan blades of the thermal power unit generator as the research object, an eddy current experiment is carried out on them. By searching the parameters such as detection frequency, lift-off effect and scanning direction, the suitable detection technology is used to replace the traditional penetration detection. The experimental results show that the effective detection frequency of the fan blades of the thermal power unit generator is between 300-1 400 kHz, which is consistent with the calculated value. The signal reduction caused by the lift-off effect on the fan blade can be compensated by increasing the gain, the scanning direction has no effect on the defect signal strength. Finally, suggestions are therefore made for the array eddy current field test of generator fan blades.
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Keywords:
- array eddy current /
- flexible /
- frequency /
- lift-off effect /
- scanning direction
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