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由于变压器绕组漏磁强度分布不均匀,检测结果易产生较大误差。为此,提出了基于矩阵分解的扼流适配变压器绕组漏磁检测方法。通过多层聚类算法组建最优编码矩阵,利用最优权重译码算法对分类器输出进行优化,得到扼流适配变压器绕组漏磁类型。采用矩阵分解方法,计算扼流适配变压器绕组漏磁后的磁感应强度数据,根据漏磁后的磁感应强度数据布置磁感应强度测量点,实现了扼流适配变压器绕组漏磁检测。仿真试验结果表明,所提方法能够精准检测漏磁点,降低了检测延时,具有广泛的应用性。 相似文献
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交变漏磁检测方法由于兼具涡流检测和传统漏磁检测的特点,对表面缺陷具有很高的识别率。在对交变漏磁检测理论进行分析的基础上,提出了基于场量测量和频率扫描技术的快速识别和深度定量检测模型,并通过试验证明了该模型能实现表面缺陷的快速检测和缺陷深度的定量检测。 相似文献
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The diameter of fine steel wire rope (FSWR) is generally a few millimeters. Its magnetic flux leakage (MFL) signal is weak, and the number of magnetic sensors installed for defect detection is limited because of the small diameter. In FSWR production workshops, different kinds of machinery work together, deteriorating the power quality and making the spatial electromagnetic environment complex; the weak MFL is thus interfered with further. It is difficult to carry out online nondestructive testing (NDT) of FSWR in the process of manufacturing. In this paper we present a novel MFL method for FSWR NDT in a strong electromagnetic interference environment. We use a three-dimensional finite element method (FEM) to analyze the MFL signals. A simplified magnetic circuit is presented to excite the FSWR; the circuit comprises two half-sized radial magnetizing ring NdFeB magnets, and because there is no need for a magnetic yoke, the device is simple and light. A single Hall sensor is used to measure the flux leakage field. A stable performance power system is designed for the NDT power supply, which is not only resistant to voltage sags, but also has very low output noise. To enhance the signal-to-noise ratio (SNR) of the MFL defects signal, a signal conditioning and processing circuit are designed to enhance the detectability of signals in MFL data. The novel and small FSWR NDT system realizes on-line testing in an environment of strong electromagnetic interference, and for the experiment with a 1.5-mm-diameter wire rope twisted by 19 wires, the minimum damage of a pit on half of a wire can be identified. 相似文献