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KULIAH #1 BERLI P. KAMIEL

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 What Causes Machine Vibration? ◦  (a) Repeating forces ◦  (b) Looseness ◦  (c) Resonance

 Repeating forces in machines are mostly due to the rotation of imbalanced, misaligned, worn, or improperly driven machine components.

  Imbalanced machine components contain “heavy spot” which when rotated, exert a repeating force on the machine

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 Misaligned machine components create “bending moments” which when rotated, exert a repeating force on the machine

 Worn machine components exert a repeating force on the machine because of the rubbing of uneven worn surfaces.

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  Improperly driven machine components exert a repeating force on the machine because of intermittent power supply.

 Looseness is often due to excessive bearing clearances, loose mounting bolts, mismatched parts, corrosion, and cracked structures.

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