基于金属磁记忆信号垂向特征分析的损伤状态识别
发布时间：2019-01-14 16:12
【摘要】：金属磁记忆是一种可对铁磁材料早期微观损伤进行有效诊断的无损检测技术。为消除磁记忆信号不确定影响因素,提高损伤状态识别的准确率,引入了磁梯度张量和磁场垂向特征分析方法。首先,利用磁梯度张量测量方法获取磁场完整的变化信息,为克服检测方向选取对检测信号的影响,利用磁场不变特征量-总梯度模量来判断损伤及损伤区的边界位置;然后,通过测量不同高度下总梯度模量的平面分布,得到总梯度模量的垂向分布特征;最后,分析了不同损伤的边界处总梯度模量的垂向分布特征差异。理论分析和实验结果表明,在提离高度逐渐增大过程中,裂纹边界处的磁梯度张量振幅的衰减速度和幅度远大于应力集中作用的结果,根据磁记忆信号的垂向特征,可有效地识别损伤状态。
[Abstract]:Metal magnetic memory is a kind of nondestructive detection technique which can effectively diagnose the early microscopic damage of ferromagnetic materials. In order to eliminate the uncertain factors of magnetic memory signal and improve the accuracy of damage state identification, the magnetic gradient Zhang Liang and the vertical characteristic analysis method of magnetic field were introduced. Firstly, using the magnetic gradient Zhang Liang measurement method to obtain the complete change information of the magnetic field. In order to overcome the influence of the selection of the detection direction on the detection signal, the invariant characteristic quantity of the magnetic field-the total gradient modulus is used to judge the damage and the boundary position of the damage zone. Then, by measuring the plane distribution of the total gradient modulus at different heights, the vertical distribution characteristics of the total gradient modulus are obtained. Finally, the vertical distribution characteristics of the total gradient modulus at different damage boundaries are analyzed. The theoretical analysis and experimental results show that the attenuation velocity and amplitude of the magnetic gradient Zhang Liang amplitude at the crack boundary is much larger than that of the stress concentration in the process of increasing the lift height, according to the vertical characteristics of the magnetic memory signal. The damage state can be effectively identified.
【作者单位】： 军械工程学院无人机工程系;
【基金】：河北省自然科学基金(E2015506004)项目资助
【分类号】：TG115.284
[Abstract]:Metal magnetic memory is a kind of nondestructive detection technique which can effectively diagnose the early microscopic damage of ferromagnetic materials. In order to eliminate the uncertain factors of magnetic memory signal and improve the accuracy of damage state identification, the magnetic gradient Zhang Liang and the vertical characteristic analysis method of magnetic field were introduced. Firstly, using the magnetic gradient Zhang Liang measurement method to obtain the complete change information of the magnetic field. In order to overcome the influence of the selection of the detection direction on the detection signal, the invariant characteristic quantity of the magnetic field-the total gradient modulus is used to judge the damage and the boundary position of the damage zone. Then, by measuring the plane distribution of the total gradient modulus at different heights, the vertical distribution characteristics of the total gradient modulus are obtained. Finally, the vertical distribution characteristics of the total gradient modulus at different damage boundaries are analyzed. The theoretical analysis and experimental results show that the attenuation velocity and amplitude of the magnetic gradient Zhang Liang amplitude at the crack boundary is much larger than that of the stress concentration in the process of increasing the lift height, according to the vertical characteristics of the magnetic memory signal. The damage state can be effectively identified.
【作者单位】： 军械工程学院无人机工程系;
【基金】：河北省自然科学基金(E2015506004)项目资助
【分类号】：TG115.284
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