Avoiding Crankshaft Axial Vibrations via Parameter Selection and Simulation
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Meeting demands for higher power density, increased efficiency and lower noxious emissions with new generations of diesel engines inevitably involves raising peak firing pressures. In developing the new D98 engines, Liebherr is investigating the effects of various forms of crankshaft loading in order to attenuate limitations on engine performance imposed by this vital component. This article is based on a paper presented at 25th Aachen Colloquium Automobile and Engine Technology.
In reciprocating internal combustion engines, the quasi-static bending and torsional loads on the crankshaft, coming from the gas pressure and mass inertial forces, are superimposed on dynamic loads caused by torsional, bending, and axial vibrations. Systematic analysis of the crankshaft torsional dynamics during cranktrain development has been common since the 1930s ,,,. In contrast, the effect of bending and axial vibrations is often not explicitly calculated in industrial practice,...
KeywordsCritical Speed Axial Vibration Firing Sequence Axial Resonance Firing Interval
The authors would like to thank the Liebherr D98 project team for their intensive help and wide-ranging contributions.
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