Design of giant magnetostrictive elliptical vibration system with single excitation
A giant magnetostrictive single-excitation elliptical vibration system for ultrasonic vibration assisted machining was developed in this paper,which was composed of a giant magnetostrictive transducer and an asymmetric flexural vibration horn.Based on the continuous boundary conditions between the components,the frequency equation of the giant magnetostrictive transducer was derived,and the horn was designed based on Timoshenko theory.Then,the influence of the transition arc in the horn on the elliptical trajectory of the output end of the vibration system was studied by using the finite element method.The design value of the resonant frequency of the vibration system was 20.486 kHz,the horn produced longitudinal and transverse vibration under the excitation of the transducer.The equivalent electrical impedance of the vibration system,the longitudinal and transverse vibration amplitudes at the end face of the horn and the phase difference between them were tested experimentally.The results show that the resonance frequency of the vibration system was 20.7 kHz,the bandwidth was 187.5 Hz,the longitudinal amplitude was slightly greater than the transverse amplitude,and the average phase difference of the longitudinal and transverse vibration after multiple tests was 101°.The measured resonance frequency and the movement track of the end of the horn were consistent with the calculated results.
Giant magnetostrictive materialSingle excitationElliptical vibrationFinite element analysis
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