The recent introduction of stringent emissionrequirements together with economic pressure has ledto a particular focus on increasing powertrainefficiency. This has seen the incorporation ofreal-time measurements to predict system behaviourand engine condition. Accurate models for allcomponents are thus important. This work investigatesthe consequences of some common assumptions made inlow frequency torsional powertrain models, andproposes improved models where appropriate. Inparticular, piston-to-cylinder friction,(crank/gudgeon) offset, and tyre torsional behaviourwere studied. It was found that piston-to-cylinderfriction can increase the inertia variation of anengine mechanism. Offset also modifies its nonlinearbehaviour. For small (gudgeon) values these effectsare minimal. However, for large (crank) values, theeffects should not be ignored. The low frequencytorsional damping properties of a small pneumatictyre were found to be more accurately represented ashysteretic rather than viscous. Time DomainReceptance modelling was used to extend the resultsto a multicylinder engine powertrain. The findingsshould be of interest to both industry and academiaalike.
The recent introduction of stringent emissionrequirements together with economic pressure has ledto a particular focus on increasing powertrainefficiency. This has seen the incorporation ofreal-time measurements to predict system behaviourand engine condition. Accurate models for allcomponents are thus important. This work investigatesthe consequences of some common assumptions made inlow frequency torsional powertrain models, andproposes improved models where appropriate. Inparticular, piston-to-cylinder friction,(crank/gudgeon) offset, and tyre torsional behaviourwere studied. It was found that piston-to-cylinderfriction can increase the inertia variation of anengine mechanism. Offset also modifies its nonlinearbehaviour. For small (gudgeon) values these effectsare minimal. However, for large (crank) values, theeffects should not be ignored. The low frequencytorsional damping properties of a small pneumatictyre were found to be more accurately represented ashysteretic rather than viscous. Time DomainReceptance modelling was used to extend the resultsto a multicylinder engine powertrain. The findingsshould be of interest to both industry and academiaalike.
On Torsional Vibrations in Axles and Shafting is an important work in the history of mathematics and physics. First published in 1902, it presents a groundbreaking analysis of the mechanics of...
The exact mathematical treatment of the problem is possible by replacing the propeller blade by a homogeneous prismatic rod. Conclusions can them be drawn as to the behavior of an actual propeller,...
Among the various factors greatly influencing the development process of future powertrain technologies, the trends in climate change and digitalization are of huge public interest. To handle these...
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