NUMERICAL VERIFICATION OF THE ACCURACYOF THE RESULTS OF MODELING COLLISIONS IN MULTIBODYSYSTEMS OBTAINED USING SIMULATIONS BASEDON THE PROJECT CHRONO LIBRARY

Simulating multibody systems presents many challenges. Project Chrono, a specialised library, has beendeveloped to support engineers tackling these challenges. To offer reliable results, such tools requirecomplex validation. This study aims to analyse and validate the low-level behaviour of contact force modelsimplemented in the module chrono::core, part of the Project Chrono library. To accomplish this, impactsoccurring in systems consisting of 4 to 6 spheres were used. The velocity of the sphere initiating the impactranged from 0.1 to 3 m/s. The post-impact velocity was used as the main comparison quantity. The referencedata for comparison were obtained from FEM analysis performed in Code Aster. The comparison resulted ingraphs showing the percentage velocity errors for all the systems investigated. These plots showed significanterrors, reaching 22.75% for some cases. At the same time, the average error for all spheres in the mentionedcase was equal to 1.68%. This led to the conclusion that a proper definition of model parameters can lead tosatisfactory results on a global model scale. The study also described potential sources of errors and proposeddirections for further development.