Methoden und Prozessoptimierung für die Rohbauentwicklung im Automobilbau unter Berücksichtigung der Fahrdynamik

• Methods and process optimisation for body-in-white development in automotive engineering under consideration of vehicle dynamics

Jafarzadehpour, Naser; Corves, Burkhard (Thesis advisor); Bertram, Torsten (Thesis advisor)

Aachen : RWTH Aachen University (2022, 2023)
Dissertation / PhD Thesis

Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2022

Abstract

Vehicle dynamics simulations largely take place without considering body-in-white stiffness. This means that the interaction between vehicle dynamic properties and resulting body-in-white deformation is taken into account insufficiently. In the simulation environment, the influence of local as well as global body-in-white stiffness has no reference to driving dynamic parameters, thus providing insufficient results. Therefore, stiffness optimisations of the body-in-white are not evaluated with sufficient accuracy in the vehicle dynamics simulation. They can only be validated in a very late phase on the test track. However, late changes in the development of body-in-white parts may not even be possible anymore. As a result, often expensive and massive measures have to be integrated into the vehicle. The present work is aimed to optimise and extend the existing digital development processes in vehicle dynamics and body-in-white in the early phases of development. In order to meet the vehicle dynamic requirements in the early phases of development, in a digital environment, it is necessary to design the body-in-white stiffness in a more targeted and efficient way. Appropriately, the elastic body-in-white structures are integrated into the full-vehicle multi-body simulation models. Using these models, the influence of body-in-white deformation on vehicle dynamics can be investigated. In doing so, the elastokinematic body-in-white effects on axle kinematics are evaluated by introducing the EBIF method (Elastokinematics By Inertia Force) and these effects are compared with already known approaches. In order to further analyse local, as well as global, body-in-white effects, the influence of body-in-white stiffness on the roll moment distribution is examined as well. Furthermore, the investigated approaches are summarised and transferred into a new digital process in the context of vehicle development.

Institutions

• Chair and Institute of Mechanism Theory, Machine Dynamics and Robotics [411910]