Due to the fact that noise emission and pollution of automobiles are of current interest, electromobility becomes more and more important to tackle the arising problems. Consequently, also issues due to vibrational and acoustical behavior of electric engines and whole electric drive trains are increasingly in the focus of automotive developers, as they are crucial criteria for the overall quality impression of the customers. In this contribution the current activities within a joint research program in the context of electromobility are presented, which cover the design, production processes and testing of electric engines and cars. Hence, many different research groups are part of this joint research project, as for example groups from mechatronics, thermodynamics, computational mechanics and rotor dynamics. In the paper at hand simulation parts will be in focus, especially the rotor dynamic behavior of the drive train as well as the electrodynamic calculations of the magnetic circuit and its interactions with structural vibrations both of the drive train and of the stator and rotor of the engine itself. The aim is to analyze the resulting vibrations of the system very precisely. In addition the sound radiation of the vibrating structures is studied. To be able to address all these aspects a holistic consideration is needed, in which the single parts of the simulation methodology base either on the finite element method or on multi-body simulations. Both are used to determine critical operation points and to evaluate the design of an electric engine/drive train with respect to the vibrational and acoustical behavior. This evaluation can be exclusively done with the help of the virtual design and without the necessity of real prototypes. Nevertheless, experimental results are used during the development process of the simulation methodology to validate the numerical results. Beside the different simulation procedures, also the validation experiments will be briefly presented and discussed in this contribution. Moreover, the holistic simulation approach will be used to derive an improved design of an exemplary electric drive train due to its rotor dynamic and vibroacoustic behavior.
Dr.-Ing. Fabian Duvigneau, Otto von Guericke University Magdeburg, GERMANY Mr. Sebastian Koch, Otto von Guericke University Magdeburg, GERMANY Dr.-Ing. Christian Daniel, Otto von Guericke University Magdeburg, GERMANY Prof. Dr.-Ing. Elmar Woschke, Otto von Guericke University Magdeburg, GERMANY Prof. Dr.-Ing. Daniel Juhre, Otto von Guericke University Magdeburg, GERMANY