Subjects: Computer Science >> Integration Theory of Computer Science submitted time 2018-05-24 Cooperative journals: 《计算机应用研究》
Abstract： Aiming to improve the fault detection ability of FD-KNN in the nonlinear and multimodal process, this paper proposes a k nearest neighbors fault detection method based on varimax rotation (Rot-KNN) . First, implement varimax rotation in observed data set to obtain an orthogonal space. Next, implement FD-KNN in the new orthogonal space to detect faults. At last, propose a fault diagnosis strategy based on contribution chart. A nonlinear simulation example and the Tennessee Eastman (TE) processes of a typical nonlinear industrial process prove that the method is effective for the latent variable fault diagnosis. The experimental results indicate that the proposed method outperforms the PCA, FD-KNN and PC-KNN.
Subjects: Materials Science >> Materials Science (General) submitted time 2016-11-12 Cooperative journals: 《中国腐蚀与防护学报》
Abstract：利用电化学噪声技术分别监测含有不同孔隙的涂层在3.5% NaCl溶液中的腐蚀行为。通过电化学噪声的时域分析、频域分析以及形貌特征，对电极的腐蚀过程进行深入研究。结果表明：电化学噪声时域谱可以预测局部腐蚀的发生，定性的说明腐蚀发生的类型；电流标准偏差σI、噪声电阻Rn和电流白噪声水平W，能定量的表征腐蚀发展的剧烈程度，当腐蚀发生时，σI、W趋于增大，Rn趋于减小。
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