基于均匀设计的磁混频硬度检测激励参数优化

Excitation parameter optimization for magnetic mixing frequency hardness measurement based on uniform design

在对铁磁材料进行磁混频检测时,高低频励磁场的激励参数直接关系到磁混频效应的强弱及检测灵敏度。针对铁磁材料硬度磁混频检测问题,利用均匀设计方法研究了励磁场参数对磁混频效应的影响。基于模糊理论,建立了包含变异系数和相关系数两个特征指标的混频效应模糊评价模型。在此基础上,通过回归分析,获得磁混频激励参数对混频效应的影响规律,并优化出获得较强磁混频效应的激励参数组合。优化结果表明,混频激励参数选择对磁混频效应有很大的影响,利用优化得到激励参数可以获得更强的混频效应,大大提高了混频检测的灵敏度。研究工作有力地推动了磁混频检测技术在无损检测领域的应用。

In the magnetic mixing frequency detectionof ferromagnetic materials,the excitation parameters of high and low frequency magnetic fields directly relate to the intensity and sensitivity of magnetic mixing frequency effect.Aiming at the magnetic mixing frequency detection issue of the hardness of ferromagnetic materials,the uniform design method is used to study the influence of excitation parameters on magnetic mixing frequency effect.Based on the fuzzy theory,a fuzzy evaluation model of mixing frequency effect with two characteristic indexes of variation coefficient and correlation coefficient is established.On this basis,the influence law of magnetic mixing frequency excitation parameters on the mixing frequency effect is obtained through regression analysis.The excitation parameter combination that can obtain strong magnetic mixing frequency effect is optimized.The optimization results show that the selection of the mixing frequency excitation parameters has a great influence on the magnetic mixing frequency effect.Using the optimized excitation parameters can obtain stronger mixing frequency effect and greatly improve the sensitivity of mixing frequency detection.The research work effectively promotes the application of magnetic mixing frequency detection technology in the field of nondestructive testing.