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Harmonic vibration

 
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sbezman



Joined: 13 Jul 2003
Posts: 12

PostPosted: Thu Aug 26, 2004 11:36    Post subject: Harmonic vibration Reply with quote

Trying to understand harmonic vibration with respect to rotating shafts, esp. different "orders". I would appreciate help with this or a reference I can read. Thank you.
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kmccutcheon



Joined: 13 Jul 2003
Posts: 298
Location: Huntsville, Alabama USA

PostPosted: Thu Aug 26, 2004 18:32    Post subject: Reply with quote

Quote:
Trying to understand harmonic vibration with respect to rotating shafts, esp. different "orders". I would appreciate help with this or a reference I can read.


The “order” of a vibration refers to its frequency with respect to crankshaft rotation. Hence, a half-order vibration occurs at one-half crankshaft speed, a first order vibration occurs at crankshaft speed, a second-order vibration occurs at twice crankshaft speed, etc. Since most engine vibration is a result of something moving with respect to the crankshaft, it is helpful to refer to vibration in terms of the crankshaft rather than in terms of its absolute frequency.
Two references that I find useful are:
Taylor, Charles Fayette. The Internal Combustion Engine in Theory and Practice, Volume 2, 1968, MIT Press.
Liston, Joseph. Aircraft Engine Design, 1942, McGraw Hill.
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