Investigations on a mathematical model for optimum impedance compensation of a giant magnetostrictive ultrasonic transducer and its resonance characteristics

•The first study to establish a mathematical model for optimum compensation of a GMUT.•The first study showing resonance characteristics for frequency tracking of a GMUT.•The optimum compensation capacitance can maximize the use of ultrasonic energy.•The feedback current signal can be used for the f...

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Bibliographic Details
Published in:Ultrasonics 2021-02, Vol.110, p.106286-106286, Article 106286
Main Authors: Zhou, Huilin, Zhang, Jianfu, Feng, Pingfa, Yu, Dingwen, Wu, Zhijun
Format: Article
Language:English
Subjects:
Energy conversion
Giant magnetostrictive materials
Optimum impedance compensation
Resonance characteristics
Transducer
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Summary:•The first study to establish a mathematical model for optimum compensation of a GMUT.•The first study showing resonance characteristics for frequency tracking of a GMUT.•The optimum compensation capacitance can maximize the use of ultrasonic energy.•The feedback current signal can be used for the frequency tracking method of a GMUT. Giant magnetostrictive materials (GMMs) have been widely used to fabricate transducers with high-energy output because of their excellent properties. However, there are few reports on mathematical models to optimize the impedance compensation and resonance characteristics of giant magnetostrictive transducers. In this study, a giant magnetostrictive ultrasonic transducer (GMUT) suitable for rotary ultrasonic machining systems is proposed. A mathematical model for optimum impedance compensation that considers the loss in energy conversion is established to maximize the use of ultrasonic energy. The frequency characteristics of the electrical feedback signal in the resonance state are investigated, and the resonance zone found is used for frequency tracking. An impedance analyzer is used to determine the parameters of the mathematical model, and the validity of the optimum compensation capacitance is verified by experiments. The frequency characteristics of the minimum current, active power, and amplitude are obtained to obtain the resonance zone in the GMUT with the lowest energy consumption. The results of this study provide a reference for frequency tracking.
ISSN:0041-624X
1874-9968
DOI:10.1016/j.ultras.2020.106286