Multi Body Simulation of a Valve Train, Comparison of 1D and 3D Models and Measurement

Valvetrain dynamics can greatly influence engine characteristics such as NVH, thermodynamics and durability. Thus it’s important to gain system knowledge on the dynamic behavior at a rather early point in the design process. With the growing availability of numerical tools, such as 1D system simulation and MBD simulation accessing data on valvetrain dynamics has become more comfortable. MBD and 1D models greatly vary in terms of calculation time, model building and the ability of applying multiple physics like mechanics and hydraulics (especially important for the modeling of valve clearance compensators). Regarding the necessity of easy to use models and justifiable calculation times, at Hatz we were running a comparison between a 1D model and a MBD model regarding result quality, calculation times and model building efforts. To evaluate the results we conducted dynamic valve lift measurements on a test engine.

 

The Author

Tobias Winter
Dipl.-Ing. (univ.)
Head of technical calculation
Department TEB
MOTORENFABRIK HATZ GmbH&Co.KG