Abstract:Under the condition of finite measurement aperture, the traditional near-field acoustical holography can cause window effects and wraparound error since it is based on fast fourier transformation, and these restrict its widely application in industrial field to some extent. In order to overcome these disadvantages, a partial sound field reconstruction technique combined wave superposition and beamforming method is proposed. At first, a beamforming method is adopted to localize sound source according the sound pressure acquired from a microphone array; then a serial of equivalent sound sources are collocated around these sound sources; after that, an iterative algorithm is used to extend the partial sound pressure; at last, the wave superposition method is applied to reconstruct the sound field based on the extended sound pressure. The technique possesses the advantages of needing of a small quantity of microphones, easiness and efficiency of sound field reconstruction. An experiment is carried out in a semi-anechoic chamber by using two sound boxed to simulate the sound source. The results show that the proposed method can accurately reconstruct sound field under the condition of small measurement aperture, and wide the application range of near-field acoustical holography in engineering application.