三角度磁巴克豪森测量平面应力方法研究  

Plane Stress Measurement Using Three Angles Magnetic Barkhausen Noise Method

作　　者：郑阳[1] 周进节[2] 谭继东[1] 张鑫 ZHENG Yang;ZHOU Jinjie;TAN Jidong;ZHANG Xin(China Special Equipment Inspection and Research Institute Beijing,100029,China;School of Mechanical Engineering,North University of China Taiyuan,030051,China)

机构地区：[1]中国特种设备检测研究院,北京100029 [2]中北大学机械工程学院,太原030051

出　　处：《振动．测试与诊断》2022年第3期417-426,611,共11页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(62071494);国家市场监督管理总局科技计划资助项目(2021MK172)。

摘　　要：为了提升磁巴克豪森(magnetic Barkhausen noise,简称MBN)应力测量效率,提出了一种三角度磁巴克豪森测量平面应力的方法,分析了角度选择对精度的影响。为了减小标定的不确定性,提出了一种基于多维特征重构不确定性度量空间的贝叶斯标定方法。实验结果表明,当应力大于50 MPa时,采用相互间隔60°的3个角度,可实现主应力值测量误差不大于±10 MPa、方向测量误差不大于±5°。贝叶斯标定模型进一步将幅值误差降低到±5 MPa以下,并将方向测量的±5°误差带扩展到40 MPa的低应力区。该研究方法为工程中采用磁巴克豪森高效、准确测量平面应力奠定了基础。Magnetic Barkhausen noise stress measurement method has the outstanding advantages of high sensitivity,high repeatability,in-situ nondestructive,convenient and efficient,low cost and so on. It has great application prospects in residual stress,structure load stress,concentration stress and damage risk evaluation. The traditional magnetic Barkhausen stress measurement is the unidirectional method,which can only obtain the normal stress in the measured direction. The circumferential measurement method developed in recent years realizes the measurement of the direction and amplitude of principal stress of plane stress state,but it needs to scan the magnetic Barkhausen distribution on 360°,causing a low testing efficiency. In order to improve the measurement efficiency,a method of measuring plane stress by triangulation magnetic Barkhausen is proposed,and the influence of angle selection on accuracy is analyzed. Moreover,a Bayes-calibration method based on multi-dimensional features reconstruction of uncertainty metric space is proposed in order to reduce the calibration uncertainty. The experimental results reveal that,when the stress is greater than 50 MPa,using three testing angles with an interval of 60°,the amplitude error of principal stress is less than ±10 MPa and the direction error is within ±5°. Using the Bayes-calibration model,the amplitude error can be further reduced to less than ±5 MPa,and the ±5° error band of direction measurement can be extended to the low stress area of 40 MPa. This method lays a foundation for using the magnetic Barkhausen to efficiently and accurately measure stress in engineering.

关 键 词：平面应力 磁巴克豪森 贝叶斯标定模型 原位测量 无损检测 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3