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<p>Simulating multibody systems with unilateral contact presents significant challenges, particularly when friction at the contact interface is considered. The complexity of the model is not only increased by the introduction of friction, but the chosen methodology for its incorporation into the dynamic equations significantly influences the simulation’s fidelity. While the literature offers various friction models, their implementation within dynamic system formulations requires careful consideration. Even when a specific friction model, such as the Coulomb friction model, is selected, the dynamic behaviour of the system can be compromised if the assumptions and simplifications in the dynamic modelling approach are not appropriately made. In this study, we investigate different approaches for incorporating friction into reduced interface models (RIM) of dynamic systems. A model-based co-simulation framework, utilizing different RIM representations, serves as the foundational context for this analysis. Due to the requirement of data exchange at discrete time points in co-simulation, two distinct methodologies for deriving RIM are explored. The first method considers all closed constraints to remain closed between two subsequent time points. In the second method, unilateral and friction constraints are allowed to open during the time step. Such distinct modelling assumptions would create fundamental differences between these approaches. The comparison between these two methods is demonstrated through case studies, and their implications for solution accuracy are thoroughly examined.</p>

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Role of friction in developing reduced interface models of mechanical systems: A co-simulation study

  • 期刊论文

  • 发表日期：

    2025年6月9日

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  • Ali Raoofian,
  • József Kövecses

摘要

Simulating multibody systems with unilateral contact presents significant challenges, particularly when friction at the contact interface is considered. The complexity of the model is not only increased by the introduction of friction, but the chosen methodology for its incorporation into the dynamic equations significantly influences the simulation’s fidelity. While the literature offers various friction models, their implementation within dynamic system formulations requires careful consideration. Even when a specific friction model, such as the Coulomb friction model, is selected, the dynamic behaviour of the system can be compromised if the assumptions and simplifications in the dynamic modelling approach are not appropriately made. In this study, we investigate different approaches for incorporating friction into reduced interface models (RIM) of dynamic systems. A model-based co-simulation framework, utilizing different RIM representations, serves as the foundational context for this analysis. Due to the requirement of data exchange at discrete time points in co-simulation, two distinct methodologies for deriving RIM are explored. The first method considers all closed constraints to remain closed between two subsequent time points. In the second method, unilateral and friction constraints are allowed to open during the time step. Such distinct modelling assumptions would create fundamental differences between these approaches. The comparison between these two methods is demonstrated through case studies, and their implications for solution accuracy are thoroughly examined.