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Torsional vibration of powertrains
Inglese
142 b
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The recent introduction of stringent emission§requirements together with economic pressure has led§to a particular focus on increasing powertrain§efficiency. This has seen the incorporation of§real-time measurements to predict system behaviour§and engine condition. Accurate models for all§components are thus important. This work investigates§the consequences of some common assumptions made in§low frequency torsional powertrain models, and§proposes improved models where appropriate. In§particular, piston-to-cylinder friction,§(crank/gudgeon) offset, and tyre torsional behaviour§were studied. It was found that piston-to-cylinder§friction can increase the inertia variation of an§engine mechanism. Offset also modifies its nonlinear§behaviour. For small (gudgeon) values these effects§are minimal. However, for large (crank) values, the§effects should not be ignored. The low frequency§torsional damping properties of a small pneumatic§tyre were found to be more accurately represented as§hysteretic rather than viscous. Time Domain§Receptance modelling was used to extend the results§to a multicylinder engine powertrain. The findings§should be of interest to both industry and academia§alike.
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