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Triggered by the need for a reduction of CO2-emissions a variety of new powertrain-concepts had been brought up in the latest years. These concepts are ranging from “Micro-Hybrid” over “Full-Hybrid” up to cars powered by an electric machine. Integration of those new powertrain-concepts into passenger vehicles leads to new demands on the acoustic development. The acoustic development process as many other processes in vehicle engineering follows the so called “V-Model”. Coming from overall subjective and objective N&V-targets, which have to be defined at the very beginning of a vehicle development project, it is essential to break down these targets to system (and even component) level in order to be able to handle the work split between complete vehicle responsibility and suppliers. In the development process these defined targets have to be reached and validated coming from system level to full vehicle level.

Lightweight vehicle design causes special demands for functional NVH design. The reduction of weight by reducing material thickness, enabled by new alloys, the combination of materials and new materials increases the sensitivity of a vehicle body to the vibrational and acoustical response of external forces like powertrain or road and wind excitation. To be able to fully raise lightweight potentials design has to be driven closer to functional boundaries, putting higher demands on the accuracy of the prediction by simulation. For a robust design a very broad view on several loadcases is needed to make sure that by optimization on one target no other target is violated. In this paper, optimization strategies for complex NVH load-cases should be investigated in detail. In reality, load-cases, excitations as well as boundary conditions are very often complex and complicated.