vibration

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adreno1981
Tanktop Cleaner
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Joined: Mon Jul 13, 2009 5:59 am

vibration

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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Joined: Thu Nov 22, 2007 8:23 am
Currently located: Dartmouth

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.
Troubleshooting 101 "Don't over think it - K.I.S.S. it"


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