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Item type:Publication, Access status: with files , Contributions to topology optimization in flexible multibody dynamics(2019); This work contributes to the development of the topology optimization of flexible multibody systems. The conventional coupling strategies of the topology optimization and the flexible multibody systems exhibit two limitations regarding its applicability in real-life and industrial application: the high computational cost that limits the optimization size, and the restricted capability of considering nonlinear effects such as contact in flexible structures. These limitations are both addressed in this work, and steps toward the modelling of nonlinearities and the large-scale topology optimization of flexible multibody systems are introduced.Publicationtype: Doctoral Thesis1072 1356 - Some of the metrics are blocked by yourconsent settings
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 3327 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: with files , Control methods of powertrains with backlash and time delay(2019); In this work methods are presented to reduce driveline oscillations and preserve high performance during load changes for conventional, parallel hybrid electrified, and battery electrified powertrains. The methods address the dominant dynamics of backlash and time delay in the powertrain. Differentially flatness is used to invert the driveline system. Time delay compensation methods are formulated and compared with regard to stability and damping behavior using stability diagrams. The most promising compensation approach is combined with the nonlinear flatness-based feedforward control strategy to control powertrains with backlash and time delay.Publicationtype: Doctoral Thesis926 2467