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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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