Razvoj matematičnega modela trenja za simulacijo dinamike torne sklopke v sistemu teles : doktorska disertacija

slovenian

doktorska dela

2013

Univerza v Mariboru, Fakulteta za strojništvo

The given PhD thesis deals with the development and validation of a friction model to be used in a fully functional friction clutch model within the software package AVL EXCITE for numerical analyses of multi-body dynamics of acomplete powertrain. Considering the demand and requirements of the target software, application and literature review the elasto-plastic friction model was chosen as the most appropriate to be investigated further. With help of numerical tests it was discovered, that the chosen friction model cannot fulfil the given requirements and demands, since it becomes discontinuous for some coincidental combinations of model parameters and input data. For this reason a modification of the elasto-plastic friction model has been carried out. The developed modified elasto-plastic friction model was validated against experimental measurements performed on a special test bed with a simplified friction clutch built especially for this purpose. The test bed enabled for acquisition of transmitted torques, angular velocities and normal force under operational conditions similar to those in a complete powertrain including an internal combustion engine. Result comparison between measurements and corresponding numerical multi-body simulations using the developed friction model showed reasonably good agreement. It has been discovered that the developed modified elasto-plastic friction model can correctly predict all friction clutch operation phases. It can provide the exact values of actually transmitted friction torque continuously. It can alsorender friction induced dynamics, for example the stick/slip effect. The developed model meets all requirements and demands of the application and fulfils the objectives of the target software.

08.08.2023