Abstract
Radiated acoustic noise contributions from the structural panels that form the inner shell of the vehicle body to the interior sound pressure response are modeled using an approximate spectral formulation. The approach essentially utilizes the theoretical interior acoustic sensitivity terms derived from a finite element model and measured spatial-averaged structural-acoustic spectra. The finite element calculation is validated by comparison to a set of experimental acoustic transfer functions. In addition, an experimental setup for measurement of the sound intensity and structural-acoustic response is used to acquire the cross and auto power spectra needed to predict the relative mean-squared velocity term of each control plane near the panel surface. These velocity functions are then combined with the acoustic sensitivity terms to compute the individual panel contribution function. The proposed approach is applied to a specific case of a passenger car to compute the acoustic noise spectra in 1/12 octave band form at selected positions in the passenger compartment. The calculations show excellent match with the overall experimental results. Also through this example, the approximate computational scheme is proven to be generally quite robust and effective for analyzing higher frequency interior noise problems.
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