Non-smooth unilateral reduced models for co-simulation of mechanical systems

Abstract

Simulation of complex systems requires the division to subsystems modelling each subsystem separately, and then interfacing and coupling them. The individual subsystems are often modelled in separate environments using different formulations and integrations. One way to couple subsystems is through co-simulation. For interactive, real-time simulation, non-iterative coupling is the main possibility. Such non-iterative co-simulation is very prone to instability problems that relate to the communication and information exchange between subsystems. This work focuses on non-smooth mechanical subsystem subjected to unilateral contacts and introduces an efficient way to interface it with the rest of the system using a reduced interface model. The proposed interface model accounts for contact attachments/detachments during the macro time step which can lead to better functionality and more accurate results. The proposed method and model is illustrated using an example of interfacing mechanical and hydraulic subsystems. The obtained results confirm that the proposed interface model enhances simulation accuracy, functionality and stability.