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Item type:Publication, Access status: with files , Real-time simulation of flexible multibody systems in vehicle dynamicsReal-time capable vehicle dynamics simulations are used for a wide range of ECU development and control algorithms. The multi-body simulations used in the process neglect elastic deformations that are becoming more important due to lightweight construction and increased NVH requirements in vehicle technology. In the present work, algorithms for the efficient simulation of flexible multi-body systems with the application example of a vehicle dynamics model with a flexible vehicle body are shown. Linear-implicit solvers for differential-algebraic systems and quaternions are used as efficient rotational parametrization. Using model reduction methods, complex finite element models are implemented in real-time.Publicationtype: Doctoral Thesis961 3324 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Evaluation and experimental validation of efficient simulation models for optimization of an electrical formula car(American Society of Mechanical Engineers (ASME), 2018-08); ; This paper presents two different ways of modeling a road vehicle for general vehicle dynamics investigation and especially to optimize the suspension geometry. Therefore a numerically highly efficient model is sought such that it can be used later in gradient-based optimization of the suspension geometry. Based on a formula style vehicle with double wishbone suspension setup, a vehicle model based on ODE-formulation using a set of minimal coordinates is built up. The kinematic loops occurring in the double wishbone suspension setup are resolved analytically to a set of independent coordinates. A second vehicle model based on a redundant coordinate formulation is used to compare the efficiency and accuracy. The performance is evaluated and the accuracy is validated with measurement data from a real formula car.Publicationtype: Conference Paper194 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Performance aspects of real-time capable flexible multibody simulationsVirtual prototyping in modern vehicle development relies mainly on detailed and versatile vehicle models, which are usually built up as rigid body models. These models are used in many fields within vehicle development, for example for driver-in-the-loop simulations or in test benches for electronic control units. With increasing use of lightweight structures and higher demand on structural stiffness, structural flexibilities may no longer be negligible. Hence realtime capable vehicle models including structural flexibilities are becoming increasingly important. Time integration of flexible multibody systems require a large-scale system of differential-algebraic equations to be solved. This is performed with a partitioned linear-implicit Euler solver, using an index-2 formulation with constraint stabilization and the floating frame of reference approach. Various options to improve time integration performance are reviewed in this work. In addition the reduction process of flexible bodies, which is based on a constraint mode analysis, is evaluated to remove unnecessary modes and reduce model size.Publicationtype: Conference Paper75 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Comparison of various models and integration method for real-time simulation of complex vehicle models with structural flexibilityReal-time simulations have become a popular way for virtual prototyping and component testing in vehicle development. A cost-effective way for such simulations are rigid body models, which can be used to simulate the vehicle behavior for a wide variety of test scenarios. However, these models neglect the elastic deformation of flexible components like the car body. This becomes increasingly important since more lightweight components are used in modern vehicles. In this work real-time simulation options for flexible multibody systems are shown for a full car model with a flexible car body.Publicationtype: Conference Paper56