Simulation of the effect of acoustic window to the planar array at different angles

A simulation method using the acoustic software SYSNOISE to study far-field acoustic performance in different angles of a planar phased array in broadside dome is performed. The planar array is installed parallel to the vessel centerline. The cases in which the acoustic window is parallel to the planar array and at an angle of 8 degrees are separately calculated. The simulation results show that the impact of the acoustic window to the far-field beams when the acoustic window is parallel to the array is smaller. When they are at an angle of 8 degrees, the impact of the acoustic window on the side lobes is more obvious than it on the main lobe. The cases when the acoustic window is fully transmissive and when it is with a titanium film are calculated. The titanium film introduces an obvious insertion loss, and the insertion loss of the side lobes is significantly larger than that in the case of the main lobe. The results have a practical significance to sonar installations in broadside domes.