Gear modeling for system simulation

 

Starting Situation

With increasing computing power, the model limits for describing dynamic processes in drive systems have also grown. Whereas in the past torsional vibration models were used, today multi-body simulation models (MBS models) with six degrees of freedom per body are state of the art. In the recent past, elastic bodies have also found their way into FMD. These allow an extended understanding of the dynamic processes within a drive system. For economic modelling and an appropriate computing time, a model with a homogeneous degree of detail must be constructed. This means that irrelevant details should not be embedded in the simulation and solved in each time step. On the other hand, all relevant influencing variables must be embedded to solve the model description. The current initial situation cannot meet these general requirements with regard to the simulation of drive systems with gearing stages.

Research Objective

The aim of the research project is to achieve an appropriate, homogeneous level of detail for the current and future system simulations of drives with gear or planetary stages within the multi-body simulation. The tooth mesh stiffnesses and load distributions on the tooth flank calculated with STIRAK will be used for the multi-body simulation in the form of characteristic maps. This closes the definition gap between simplified and extremely detailed mapping of the gearing. Accordingly, it is practically possible to locally emboss the tooth forces on an elastic body in a complete powertrain model in the multi-body simulation and to use FE based calculated tooth stiffnesses in the multi-body simulation.