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**Unformatted text preview: **” Fault Detection and Diagnosis “ cars ” Modification of the Dynamic characteristics 10 SOURCE OF VIBRATION 11 Mounting of measuring units 12 Temp . Press . Flow Oil Vib . Out of balancing ✔ Miss alignment ✔ ✔ Damage in Rolling Bearing ✔ ✔ ✔ Damage in Journal Bearing ✔ ✔ ✔ ✔ ✔ Damage in Gears ✔ ✔ Mechanical Looseness ✔ Cracking ✔ Noise ✔ 13 Natural frequency X (t) F (t) K C 14 2 ( ) ( ) cos( ) ( ) ( ) cos( ) where / , n n m x t k x t F t x t x t f t k f F m m && && 15 RMS True peak - peak RMS peak For Sine waves only: a T = averaging period RMS K factor = Crest factor = K factor = RMS peak 16 A T a t dt RMS T 1 2 ( ) A A peak RMS 2 * A A peak RMS A A RMS peak A peak A peak peak A peak A peak peak Acceleration Velocity Displacement M a M d v v a d m m a d v m a v d Velocity Displacement Acceleration Time (Simple vibration) Frequency (real machine) 17...

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- Fall '16
- MR BIJU CV
- Tacoma Narrow Bridge, VIBRATION SINGLE DEGREE