Papers by Keyword: Travelling Waves

Abstract: Aimed at the prominent problem of algorithm complexity, massive operation scale and difficulty in applying the wavelet transform in the field of travelling waves signal detection, this paper presents a current travelling waves singularity signal detection method for shipboard power system single-phase grounding fault (SGF) line selection using morphological gradient technology for extracting transient fault features. The simulation results conducted by EMTPWorks have proved that the method presented in this paper have a veracity as well as reliability in grounding fault line selection. It is of high practical value.

Abstract: The investigation about traveling wave solutions of nonlinear equations is an important and interesting subject because they play important role in understanding the nonlinear problems. By using the (G′/G)-expansion method proposed recently, we construct the travelling wave solutions involving parameters for the Hirota and Satsuma equations. The travelling wave solutions are expressed by the hyperbolic functions, the trigonometric functions and the rational functions. The numerical simulation figures are shown.

Abstract: Aiming at the ultrasonic vibration polishing technology of silicon wafer, this paper proposes a disc-shaped ultrasonic piezoelectric polishing vibrator of out-of-plant bending travalling wave. Basing on numerical analysis, the principle prototype of the polishing vibrator has been designed and produced, and then tested. This polishing vibrator can be used in polishing process of semiconductor silicon wafer.