A shooting and bouncing beams method for calculating the acoustic scattering field of concave targets

A shooting and bouncing beams method is proposed,which is able to predict the acoustic scattering field when the sound beam is reflected on the concave target surface more than once.Incident sound field is divided into some sound beams.The direction and transmission loss of every sound beam is calculated based on geometrical acoustic method,and the acoustic scattering field of the last reflection beam's planar element are calculated based on physical acoustic method.The superposition of all beam's scattering field is the target's scattering field.Scattering field of orthogonal concave cone was calculated using shooting and bouncing beams method and measured in water tank.The comparison with both the results of calculation and experiment has been found satisfactory.As a high-frequency approximate numerical method,the shooting and bouncing beams method can be used to calculated acoustic scattering field including multiple scattering.