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This will be helpful for You to interpret kurtogram https://www.mathworks.com/help/predmaint/ug/Rolling-Element-Bearing-Fault-Diagnosis.html If we look on the results the most important elements are: Kmax = 2.7083 - is maximum value or kurtosis Optimal Window Length = 128 - this value we can use to calculate spectral kurtosis Center Frequency = 2.6703 kHz ...


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[Given figures are from A new improved Kurtogram and its application to planetary gearbox degradation feature analysis, Xianglong Ni et al.] This $k$ in the graph (and the $K$ in the Table) corresponds to an equivalent "dyadic-power", providing the number of subsequences at each level, alternating dyadic splits with filters on subbands $[0,1/4]/[1/...


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