Rectangular sources and systems of sound sources with large directionality

This paper presents a method for constructing plane, rectangular sound sources with large directionality of vibration energy radiation into the far field. The directional properties of sound sources of this type were analysed for uni¬form, Hanning and Blackmann distributions of the vibration velocity amplitude on their surface. It was found that a rectangular sound source with large direc¬tionality of vibration energy radiation into the far field can be realised in prac¬tice in the form of a plane, rectangular mosaic system of sound sources with a discrete Hanning distribution of their relative bulk efficiencies.