The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

The class IV flexural transducer is an electroacoustic converter that generates flexural vibrations in an elliptical metal shell based on a piezoelectric stack, enabling it to radiate high sound pressure levels. However, the analysis methods for the amplitude magnification ratio of this transducer have been complex, resource intensive, and challenging to comprehend due to the intricate relationships between physical factors. To address these limitations, this study proposes a simplified theoretical analysis method based on an approximate calculation of the elliptical shell’s circumference. Using this approach, the amplitude magnification ratio was derived. The relationship between the aspect ratio of the ellipse and axial deformation was explained using Ramanujan’s approximation. To validate the method, various class IV flexural transducers with different aspect ratios were designed and experimentally tested. The experimental results confirmed that as the ellipse’s aspect ratio increases, the amplitude magnification ratio decreases, and there is a strong correlation between the theoretical formula and the experimental data. The proposed analysis method is expected to offer an efficient and reliable approach for the design and performance prediction of class IV flexural transducers.