Development and Application of a Hybrid Method for Road Noise Optimization

To solve interior rolling noise issues after vehicle development has been finalized, a robust procedure is desired, which combines the strengths of both the experimental and the simulation world. This paper proposes a methodology that is focused on rolling noise issues in the frequency range from 100 to 600Hz and whose core is constituted by a source identification procedure. By means of an inverse method that makes use of the information coming from several microphones, each of the interior areas of the passenger compartment walls is identified as an equivalent source and one can then determine which one is the most contributing to the interior noise under operating condition. This allows a direct and optimized application of countermeasures aimed at the reduction of the interior rolling noise.