Design of underwater magnetostrictive longitudinal-type transducers with circuit model considering eddy currents and multi-rod structure

Underwater magnetostrictive longitudinal-type transducers (UMLT) are widely used for high-power sonar applications to generate sound waves. When designing an UMLT, to establish an effective model is one of the most necessary but difficult tasks. However, due to the special properties of giant magne-tostrictive materials (GMM), the traditional design methods of transducer are completely inapplicable. Therefore, an electro-magneto-mechanical multi-field coupling model is established in this paper, and the eddy current effect, multi-GMM rod structure and other factors are fully considered. Based on the model, the resonant frequency, impedance characteristics and transmitting current response can be cal-culated to guide the design of UMLT. To verify the feasibility of the proposed model, a measurement experiment platform is constructed. The results validate that the proposed model is effective and more accurate than the conventional model. Thus, it can also be considered as a guideline for the design and analysis of UMLT.(c) 2022 Elsevier Ltd. All rights reserved.

Automated summary

In this paper, an electro-magneto-mechanical multi-field coupling model is established to guide the design of UMLT. The model fully considers the eddy current effect, multi-GMM rod structure, and other factors. The proposed model is validated through measurement experiments and found to be more effective and accurate than the conventional model. It provides a guideline for the design and analysis of UMLT.