Sonar Ring Transducers with Periodic Structure

摘要

In practical experience of using ring sonar transducers often arises the necessity in transmitting low frequency signals when the dimensions of the transducers are limited. Attempts to transmit acoustical signals in the frequency region well below the resonance lead to decrease of radiated power due to restrictions of driving voltage. This drawback may be overcome by using the ring vibrating system with periodic structure in which part of active material (ceramic) is substituted by passive staves. Vibrating mechanical system of periodic structure with alternating ceramicand passive staves ofvarious materials is analyzed. It is shown that passive staves of textolite lower the resonance frequency and mechanical stresses of vibrating system at great extent. Some practical results comparing ceramic and periodic structure rings are presented.