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sbezman
Joined: 13 Jul 2003
Posts: 12
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 Posted: Thu Aug 26, 2004 11:36 Post subject: Harmonic vibration |
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| 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: 292
Location: Huntsville, Alabama USA
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| Posted: Thu Aug 26, 2004 18:32 Post subject: |
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| 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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Kimble D. McCutcheon |
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