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29.7 DEALING WITH VIBRATIONS
À pVibrations are basically the result of cyclic applications of forces. After the vibrations have been identified as frequencies, the phenomenon can be associated with physical design features.
29.7.1 Sources
(|unbalanced rotating masses - these can be overcome by addition of counterweights
rubbing will result in partial or full contact during some repetitive motions. Rubbing often worsens and leads to failure.
misaligned couplings can lead to displacement or bending forces that induce vibrations.
loose fittings will knock, rock, rub, etc.
resonance caused by lack of damping.
oil whirl and whip - oil films in hole shaft bearings can flow in a sporadic manner, causing the shaft to vibrate, sometimes catastrophically.
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