Sound intensity-based panel noise contribution analysis for improving the acoustic performance of a vehicle interior
abstract
One of the main NVH goals of most car manufacturers is to enhance acoustic performance while meeting demanding weight and cost targets. Typical vehicle optimization strategies are designed via numerical simulations and later adjusted through modal and noise testing. Although traditional techniques are reasonably effective, they are often very laborious and time-consuming. This paper proposes a novel methodology to identify key radiation areas and rank their importance towards the front and rear passengers. An extension of the substitution monopole technique is introduced, combining 3D sound intensity measurements and acoustic transfer functions.
The suggested measurement approach significantly simplifies the refinement process of a vehicle interior, reducing the traditional testing process to just a few days. Details about the measurement methodology are presented in this paper along with a vehicle investigation performed on a roller test bench for several operational conditions. The experimental results demonstrated that the proposed technique provides an extensive amount of vibro-acoustic data for every vehicle section, including noise ranking and visualization of complex acoustic phenomena in three-dimensional space. This information was successfully used for designing and improving the acoustic package of a commercial electric vehicle.
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