Analysis of Displacement Amplification Characteristics of Class IV Flextensional Shell Based on Elliptic Perimeter Approximation Formula
* Presenting author
As the most widely used underwater acoustic transducer, class IV flextensional transducer can get larger amplitude flexural vibration from longitudinal vibration of driven stack by the displacement amplification effect, thereby radiating more energy. In order to further quantitatively understand the displacement amplification characteristics of elliptical tube shell, this paper proposed to calculate the displacement magnification using the ellipse perimeter approximation formula, and the variation law of the displacement amplification with the compression coefficient and the deformation rate was obtained, which was analysed and compared with the results by the method of finite element analysis. The empirical formula for calculating the finite element results by the results of the perimeter approximation formula was got by fitting curves. When the compression coefficient is 0.24~0.80, the error of the calculation results was not more than 6.11%, and finally the preliminary verification was carried out by experiments. The research of this paper has certain reference significance for the estimation of the radiation performance of low frequency transducers.