A friction model for dynamic analyses of multi-body systems with a fully functional friction clutch

Abstract

This article focuses on the development and experimental verification of a friction model to be implemented in a fully functional friction clutch. The resulting clutch model is intended to be employed in commercial software code AVL Excite, which imposes special requirements also for the underlying friction model. These requirements are related to model implementation, available input data, required output data, model complexity, numerical stability, and model parameters. Since for a fully functional clutch the ability to render true stick is crucial, the elasto-plastic friction model is chosen as a basis. This model is investigated in detail and modified adequately in order to meet all of the requirements and to deliver stable and satisfactory results. For validation purposes, a special test bed was built to measure the transmitted torques through the friction contact under various realistic load cases, including all operation phases of the friction clutch. Parallel to experimental measurements, multi-body simulations were done with the modified friction model within the target software. A very satisfactory agreement of simulation and measurement results was achieved.