Abstract
In free field, the directivity of sound pressure is omni directional, and the directivity of vibration velocity is dipole directional, it can bring many advantages for acoustic measurements by combining utilization of both sound pressure and vibration velocity information. However, under the condition of boundary, the directivity of pressure and vibration velocity will be distorted by diffraction wave. In this paper, the soft boundary element model of finite cylinder baffle is established; the sound diffraction field of a plane wave from it at different frequencies and incident angles is calculated, the characteristics of directivity of pressure and vibration velocity at different frequencies and different distances are analyzed.
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