Transactions of Nanjing University of Aeronautics & Astronautics
Design and Magnetic Field Uniformity of Giant Magnetostrictive Ultrasonic Transducer for Progressive Sheet Forming
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Abstract:
Design of a giant magnetostrictive ultrasonic transducer for progressive sheet forming was presented. A dynamic analysis of the theoretically designed ultrasonic vibration system was carried out using the finite element method(FEM). In addition, simulations were performed to verify the theoretical design. Then, a magnetically conductive material was added between the giant magnetostrictive rod and the permanent magnet. Besides, magnetic field simulations of the transducer were performed. The influence of the material thickness of the magnetically conductive material on uniformity of the induced magnetic field was studied. Furthermore, the impedance analysis and amplitude measurement were performed to compare the performance of transducers with and without the magnetically conductive material. The experimental results show that the magnetic field uniformity is the highest when the magnetically conductive material has a thickness of about 1.6 mm. The output amplitude of the giant magnetostrictive transducer is improved by adding the magnetically conductive material. Moreover, the mechanical quality factor and impedance are reduced, while the transducer operates more stably.
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Clc Number:
TB663
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