Simulation of an Engine Speed-Up Run with Consideration of the Oilfilm Properties: Integration of EHD – MBS – FE – Fatigue

Authors

Dipl.-Ing. M. Prandstötter, Dipl.-Ing. H. Riener, Dr. M. Steinbatz, MAGNA Steyr Engineering, St.Valentin

Year

2003

Print Info

Fortschritt-Berichte VDI, Reihe 12, Nr. 539

Summary

This paper deals with the integration of an elastohydrodynamic oil film model (EHD) into ADAMS by means of an User Written Subroutine (co-simulation) in order to perform an accurate transient fatigue lifetime prediction of a crank shaft, based on an engine speed-up run. For this purpose it is necessary to consider the bending line of the crank shaft as accurate as possible. Attempts in the past [1] by using substitute systems (Kelvin-Voigt-elements,...) are only the first step in this direction. Consequently, using an EHD model, which is able to completely describe the dynamic properties of the oil film in the lubrication gap of the main bearings of the crank shaft, will yield realistic boundary conditions for an accurate representation of the bending line of the crank shaft in the simulation process. In this paper we will present a modally based fatigue analysis of a crank shaft, using an integrated simulation process of FEM, MBS and EHD.

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