A Joint Fault Diagnosis Scheme Based on Tensor Nuclear Norm Canonical Polyadic Decomposition and Multi-Scale Permutation Entropy for Gears

Mao Ge 1,2, Yong Lv 1,2, Cancan Yi 1,2,*, Yi Zhang 1,2 and Xiangjun Chen 3 1 Key Laboratory of Metallurgical Equipment and Control Technology, Wuhan University of Science and Technology, Wuhan 430081, China; [email protected] (M.G.); [email protected] (Y.L.); [email protected] (Y.Z.) 2 Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China 3 Zhejiang Provincial Special Equipment Inspection Research Institute, Hangzhou 314415, China; [email protected] * Correspondence: [email protected]; Tel.: +86-27-6886-2857; Fax: +86-27-6886-2212