Model Reduction of the Flexible Rotating Crankshaft of a Motorcycle Engine Cranktrain
This paper addresses the development of an elastodynamic model of a motorcycle engine cranktrain aimed at accurately evaluating the interactions between the crankshaft and the engine block, thus allowing an improved structural design. A rigid multibody model is first implemented and simulated; only...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2011-01-01
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| Series: | International Journal of Rotating Machinery |
| Online Access: | http://dx.doi.org/10.1155/2011/143523 |
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| Summary: | This paper addresses the development of an elastodynamic model of a motorcycle engine cranktrain aimed at accurately evaluating the interactions between the crankshaft and the engine block, thus allowing an improved structural design. A rigid multibody model is first implemented and simulated; only kinematic joints are involved at this stage, leading to a statically determinate assembly of the mechanism. Such a modelling approach prevents the loads at certain interface locations to be evaluated; furthermore, high-frequency
dynamic effects cannot be predicted. These drawbacks can be removed by introducing bushing-like elements and/or modelling
component flexibility. In this paper, this latter aspect is the objective of the investigation; in particular, a finite element model of the
crankshaft is implemented as a replacement for the corresponding rigid member. The well-established Craig-Bampton model
reduction technique is used to represent the elastodynamic behaviour of the component with a limited number of coordinates. The
mode selection procedure is emphasized here: a measure of modal dynamic importance, namely the effective interface mass fraction,
is used to rank fixed-interface normal modes based upon their contribution to loads at the substructure interface; choosing the modal
base according to such ranking leads to a minimal yet accurate representation. |
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| ISSN: | 1023-621X 1542-3034 |