Implementation of the Rigid Ring Tyre Model and Accompanying Soil Model in a Complete Vehicle Simulation Tool for Trucks
Examensarbete för masterexamen
Applied mechanics (MPAME), MSc
Volvo got a library of Virtual Transport Models of their trucks (VTM). These models cannot simulate soft soil roads due to the currently implemented tyre model. A new tyre/soil model is being developed in conjunction with the University of Ontario Institute of Technology, which is to be implemented to work with the models in the VTM library. The university model the tyre and soil using finite element method (FEM) and smoothed particle hydrodynamics (SPH), which is too computationally demanding to implement in VTM. The model that was to be implemented was instead a simplification comprising of springs, dampers and masses. The parameters of these elements are estimated from different FE-simulations done by the university. Once the tyre model is implemented it will be verified against the FE-model by comparing simulation results. In addition, the model will be compared to the currently implemented model to ensure an overall similarity between the models. The overall results shows promise in the new tyre model. All of the single tyre simulations have given satisfactory results after some of the parameters were corrected. The soil model is however not able to completely capture the results of the FE-simulations but is considered acceptable. The full vehicle model has given good results even though the vertical soil model and the rolling resistance in the soil needs further investigation to capture an even more realistic dynamic response. The rigid ring model on rigid ground is deemed to work properly and gives good results. The soil model has given acceptable results but it does not capture the full soil behaviour. Additionally the soil model has been non-physically altered to get good results. This warrants further studying of the model and its parameters in order to further refine the model. The rolling resistance in the soil also needs further investigation since the model is crude and uncertain. The implemented tyre model requires the same order of magnitude in simulation time as the original magic formula rigid ground model.
Farkostteknik , Transport , Vehicle Engineering , Transport