This chapter presents the advantage of using system based model analysis to assess the dynamic behaviour of an internal combustion engine crankshaft. The crankshaft model couples the structural dynamics and the main bearing hydrodynamic lubrication using a system approach. The scope of this chapter is the study of the crankshaft strength and main bearing structural integrity which limits the front end belt loads. Basically there are two limiting factors for the belt loads: 1. The crankshaft strength limits the belt loads in vertical upward direction due to the superposition with the maximum gas load. 2. The front end main bearing limits the belt loads in horizontal direction due to the restricted load carrying capacity in the area of the split line. Crank Train simulation for the following was performed: 1. Torsional analysis. 2. Bearing analysis. 3. Strength analysis. In this work Torsional Vibration (TV) trials were conducted on 5.7l 6-cylinder Euro3 160HP Turbocharged Intercooled Diesel Engine in test bed and Crankshaft fatigue testing was done. The data of these experimental investigations were used for model validation and correlation of Crank Train Simulation results. According to design criteria, regarding structural integrity, the maximum recommended vibration amplitudes per order at the crankshaft front end are in the range of 0.20-0.25° for in-line six cylinder engines. The analysis considers a Torsional Vibration Damper (TVD) assembled to the crankshaft front-end along with additional pulley for power take-off, this is used to drive AC compressor and other auxiliary units (FEAD-Front End Auxiliary Drive - as shown in Figs. 1 and 2.).


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