Vehicle Interior Structure Borne Noise Calculation Using Finite Element Method

In this paper the interior noise level of a vehicle due to structural vibration, named structure borne noise, as a part of NVH analysis has been investigated. First structural analysis is performed and vibrational behavior of structure carried out due to power plant excitations. Then interior acoustic cavity response for such excitation and resultant noise is determined. Vibrational analysis is performed on three dimensional structure and internal cavity, by considering all the effective components and vibrational tracks in the cabin. Finally, the acoustical behavior of the cavity in different frequencies predicted by cavity normal modes, and results are used to reduce noise level through passive noise control methods.