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Tanktop Cleaner
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Postby adreno1981 » Thu Mar 31, 2011 8:15 pm

what are the principal reasons for compounding of machinery vibration in connection with operation of long stroke diesel engines and associated machinery arrangements ? what are the key factors for excitation generated by the engine?

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D Winsor
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Re: vibration

Postby D Winsor » Thu May 05, 2011 4:52 pm

I believe what you are referring to is more commonly called "Critical Speed"
Long stroke engines turn at a very low speed and centrifugal torsional dampers are not effective in counteracting the harmonics developed in the crank shaft.
When an engine is run at a speed that these harmonics synchronize with other vibrations in the drive line the ossilations are amplified to the point damage can be done to the engine.
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