Acoustic radiation of moving dipoles and axial quadrupoles consisting of discrete antiphased monopoles

An acoustic field generated by a moving dipole that consists of two antiphased monopoles and an axial quadrupole represented as a combination of four discrete monopoles with corresponding phases was analyzed. It was revealed that the angular distribution of the pressure amplitude of the distributed source depends on the additional phase incursion between interfering waves due to the anisotropic character of the medium. The angular characteristics of the pressure amplitude of the distributed dipole and quadrupole, which depend on the orientation and velocity of their motion, were mathematically simulated. The results were compared with the conclusions drawn by other researchers.