Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Characteristics of Pulse Width Modulation(PWM) Excitation of Ultrasonic Elliptical Vibration Cutting Device

초음파 진동절삭기의 펄스폭변조 가진 특성

  • Loh, Byoung Gook (Department of Mechanical Systems Engineering, Hansung University) ;
  • Kim, Gi Dae (School of Mechanical and Automotive Engineering, Catholic University of Daegu)
  • Received : 2013.09.24
  • Accepted : 2013.11.11
  • Published : 2014.02.28
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Abstract

To obtain an elliptical trajectory at the cutting edge during elliptical vibration cutting, sinusoidal voltage excitations of two piezoelectric actuators have commonly been used. In this study, PWM excitation, which is relatively simple to generate, was employed and its characteristics were investigated. In experimental and analytical analyses, we found that for PWM excitation, the integer-multiple frequencies of the excitation voltage distorted the shape of the elliptical trajectory, whereas at a duty ratio(DR) of 50%, the distortion of the elliptical trajectory was minimized due to disappearance of the first overtone. When the magnitude of the maximum excitation voltage was maintained at the same level for both PWM and sinusoidal excitation, PWM (DR=50%) excitation produced a greater vibration amplitude than sinusoidal excitation but resulted in more rapid saturation of a high-frequency power amplifier.

Keywords

References

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