Identification of panel acoustic contribution based on patch nearfield acoustic holography

Abstract

To identify panel acoustic contribution to the interior sound field, a new method using a modified sound field separation technique based on patch nearfield acoustic holography is presented. An improved sound field separation technique with single semi-closed surface covering the panel of interest is proposed to simplify the measurement process. The outward and inward pressures relative to the hologram surface can be separated directly by establishing the relationship between the measured acoustic pressures and calculated values based on the equivalent source method. The acoustic quantities on the vibrating panel surface can be reconstructed from the free radiated field by getting rid of the inward and the scattered field on the surface. The acoustic power on the panel is obtained as a criterion to evaluate the relative contributions to the interior sound field. A numerical simulation of a scaled car cabin model is investigated and the results demonstrate that the proposed method is an available approach for identifying panel acoustic contribution on the vibrating surface of interest to the interior sound field inside a cavity.