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Bolted joints are widely used in CNC machine tools and the presence of joint interface results in discontinuities in the local stiffness and damping of the structure, which affects the dynamic characteristics of CNC machine tools. This paper focuses on identification techniques for the nonlinear characteristics of bolted joints from experimental perspectives: (1) Time-domain methods and frequency-domain...
Online monitoring of the mechanical performance of onload tap changers (OLTCs) within high-voltage (HV) power transformers is of utmost significance for a safe, stable, and reliable operation of the power systems. This paper investigated a novel strategy based on a Hidden Markov Model (HMM) for mechanical fault diagnosis of OLTCs. With partition, normalization, and vector quantization of the power...
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