摘要
壁厚是电站锅炉水冷壁管质量监测的一个关键指标,为了实现对水冷壁管的快速无损检测和质量评价,提出了主磁通检测与超声波检测相融合的壁厚检测新方法。结合主磁通检测速度快和超声波检测准确度高的特点,利用超声波测厚值对壁厚磁性检测量化模型参数进行在线标定,建立磁性信号与管壁厚度之间的关系曲线,以实现壁厚的快速定量评价。实验结果表明,主磁通超声波融合检测方法的评价精度优于统计关系模型,更适合水冷壁管质量的在线检测与实时评价。
Wall thickness is a key index for water-wall tube inspection in power plant,in order to inspect the tube quickly and evaluate the wall thickness quantitatively,a new method combining the magnetic main flux（MMF） with ultrasonic technique was proposed. The magnetic technique was used to do full inspection and locate the flaws,and the ultrasonic was employed to implement further quan- titative inspection accurately. Then,the data measured by ultrasonic transducer was used to calibrate the MMF model parameters firstly,and a function was specified to fit the relations between the wall thickness and the peak value of MMF signal, thus the wall thickness can be evaluated quickly. The experimental results demonstrate that the model used in this system has better accuracy than that by the statistics relation model obviously,and it is suitable for defect evaluation in real time.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2006年第10期1079-1081,1090,共4页
China Mechanical Engineering
基金
国家自然科学基金资助项目(50305017)
武汉市青年科技晨光计划资助项目(20045006071-27)
湖北省现代制造质量工程重点实验室开放基金资助项目(2005B13)
关键词
水冷壁管
主磁通
超声波
无损检测
water-wall tube
main magnetic flux
ultrasonic
nondestructive testing
