The evaluation of the torsional and bending vibration behaviour of the cranktrain is of critical importance in engine design. Sophisticated simulation models and analysis techniques are used to evaluate the vibration behaviour and fatigue strength of the crankshaft under operating conditions. The optimisation of the crankshaft, bearings, piston/rings and conrod in view of durability, low weight and friction considers the supplier and production capability.
The piston motion is simulated and optimised for minimum noise excitation, blow-by and good oil control.
The crankshaft bearings are analysed and optimised considering the dynamic behaviour of the main bearing wall or the con rod big end. The elasto-hydrodynamic simulation gives precise and experimentally verified results of oil film thickness and pressure, allowing a far more accurate specification of highly loaded bearings than with traditional methods.
The results are continuously updated and verified by experimental results such as strain gauging on the crankshaft under operating conditions.