Browse Publications Technical Papers 2020-01-1521
2020-06-03

Simulating and Optimizing the Dynamic Chassis Forces of the Audi e-tron 2020-01-1521

With battery electric vehicles (BEV), due to the absence of the combustion process, the rolling noise comes even more into play. The BEV technology also leads to different concepts of how to mount the electric engine in the car. Commonly, also applied with the Audi e-tron, the rear engine is mounted on a subframe, which again is connected to the body structure. This concept leads to a better insulation in the high frequency range, yet it bears some problems in designing the mounts for ride comfort (up to 20Hz) or body boom (up to 70Hz). Commonly engine mounts are laid-out based on driving comfort (up to 20Hz). The current paper presents a new method to find an optimal mount design (concerning the stiffness) in order to reduce the dynamic chassis forces which are transferred to the body up to 100Hz. This directly comes along with a reduction of the sound pressure level for the ‘body boom’ phenomena. Here we use multibody simulation along with a sophisticated tire model in the time domain in order to capture the correct excitation and structural dynamics behavior. Along with an optimizer, we run a design of experiments (DOE) in order to find the optimal setup for engine-mount stiffness and therefore reduce the sound pressure level by 4dB.

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