Effects of structural changes on the monopole acoustic transducers

In acoustic logging, piezoelectric transducers are usually used as transmitters and receivers to achieve excitation of sound sources and reception of signals. With the improvement of the instrument level, there are stricter requirements for the structural parameters of the transducer. In this paper, the finite element method of COMSOL is used to simulate and analyze the structure of regular and irregular monopole transducers. The influence of the thickness of FRP, the thickness of piezoelectric ceramics and the change of structure on the eigenfrequency of the transducer and the maximum total linear displacement of the transducer are discussed. The results show that the increase of the thickness of the FRP and the decrease of the thickness of the piezoelectric ceramic will make the eigenfrequency increase almost linearly, while the maximum total linear displacement decreases as a whole. When the structure changes fundamentally (truncated cone-shaped transducer), when the bottom surface radius of the piezoelectric ceramic remains unchanged, when the top surface radius changes, its eigenfrequency decreases almost linearly with the increase of the top surface radius, and compared with the regular transducer model, the eigenfrequencies of the irregular model are hardly changed by the change of the structure, and the maximum total displacement of the line also tends to decrease with the change of the top surface radius.