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Torsional vibration of powertrains:. Edition No. 1

  • ID: 1906150
  • June 2009
  • 152 Pages
  • VDM Publishing House
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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

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Andrew Louis, Guzzomi.
Obtained a PhD from the School of Mechanical Engineering at the
University of Western Australia (UWA) with this work. He also has
a BE from UWA, has completed a UWA Postgraduate Teaching
Internship and been a UWA Whitfeld Fellow. He is currently a
research associate at DIEM and DEIAgra of Alma Mater Studiorum –
the University of Bologna.

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