Co-simulation or simulator coupling is frequently used in order to couple different simulation tools. In this work, a multibody system (MBS) is numerically coupled with a finite element model (FEM) to simulate nonlinear rotor/bearing interaction phenomena in automotive turbochargers. The dynamic behavior of the rotor is simulated with a MBS software package, which is coupled by a TCP/IP interface and a force-displacement coupling technique with different FE solvers, that calculate the pressure distribution in the oil films of the floating ring bearings. Using standard implicit or explicit coupling approaches often yield extreme simulation times or may fail due to numerical instabilities. In this paper, a semi-implicit coupling technique is applied, which yields stable results with comparatively small simulation times. Rotor vibrations are calculated based on a detailed bearing model, taking for instance into account the oil bores in the floating rings and also misalignment effects of journal and ring.
展开▼
