For many years now, we have been successfully researching the vibrations of vehicle and machine components – as well as the emission of noise of from vibrating structures. This field is generally referred to by the acronym NVH (Noise, Vibration, Harshness). For example, aggregates installed in a thin-walled housing emit a great deal of noise via this housing (which acts as a resonating body). This noise can be considerably reduced by "intelligently" shaping the housing. With the help of comprehensive parameter studies, we have established guidelines for designing reduced-noise housings, as well as determining the potential for noise reduction. Vibration excitation due to gear wheels and rolling bearings can be measured directly in the load path on our own gearbox test bench, and calculated using multi-body simulation models. The work combines more than 25 years of experience in the field of numerical airborne sound calculation and experimental validation of the calculations at every stage – also including auralization of the simulated sounds.
Institute for Automotive Systems Engineering Prof. Bernd Graf