7.2 Extended inner race fault – Cyclic spectrum comparisons Fig 9 shows the cyclic spectrum comparisons for the residual signals obtained after removing periodic parts using Discrete Random Separation (DRS) [23, 24] for the experimental (9.I), LPM (9.II) ,HUMS model (9.III) and the current condensed model (9.IV). The comparison is made at a cyclic frequency α = 0 (normal power spectrum comparison) and at α = Ω (shaft speed). Fig 9: Cyclic Spectrum comparisons after the removal of discrete components (a) Measured residuals compared at α =0 (b) Measured residuals compared at α = Ω (b) LPM model residuals compared at α =0 (c) LPM model residuals compared at α = Ω (d) HUMS model residuals compared at α =0 (e) HUMS model residuals compared at α = Ω (g) Current model residuals compared at α =0 (h) Current model residuals compared at α = Ω 407
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