Aiming at the phenomenon of amplitude attenuation and amplitude instability in ultrasonic machining

studying the influence rule of the axial and radial processing load force on the electrical characteristics of the ultrasonic vibrator was analyzed

and studying the mechanism of the influence of the change of the electrical parameters of the ultrasonic vibrator on the ultrasonic amplitude

through the static loading experiment of the ultrasonic vibrator. The results showed that

the electric parameters of the ultrasonic vibrator have similar changing trend under the radial load force and the axial load force. The dynamic resistance increases unidirectionally with the increase of load force. Dynamic inductance and dynamic capacitance have opposite changing trend

and they cause the resonant frequency increases with the increase of load force together. The static capacitance fluctuates within a certain range. The low-frequency resonance point of the ultrasonic vibrator will disappear

when the cutting force of the ultrasonic vibrator increases to a certain value. According to the theoretical analysis and experimental results

the measures to improve amplitude attenuation and amplitude instability are proposed.