Requirements for a transportation system based on ultrasonic traveling waves using the measurement of spatial phase difference

2022 ◽  
Vol 168 ◽  
pp. 108708
Author(s):  
Jie Zhao ◽  
Guanyu Mu ◽  
Huijuan Dong ◽  
Tong Sun ◽  
Kenneth T.V. Grattan
Keyword(s):  
Phase Difference ◽  
Traveling Waves ◽  
Transportation System ◽  
Spatial Phase

Use of spatial phase difference method to detect microwaves associated with stator coil partial discharge in a generator

1997 ◽  
Vol 121 (2) ◽  
pp. 16-26 ◽  
Author(s):  
Masatake Kawada ◽  
Zen-Ichiro Kawasaki ◽  
Kenji Matsuura ◽  
Toshio Musashiya ◽  
Katsunori Otoba ◽  
...  
Keyword(s):  
Phase Difference ◽  
Difference Method ◽  
Partial Discharge ◽  
Spatial Phase

scholarly journals Development of a New System for Detecting Microwave Associated with a Partial Discharge of the Stator Coil in Generator Using Spatial Phase Difference Method

1997 ◽  
Vol 117 (2) ◽  
pp. 224-232 ◽  
Author(s):  
Masatake Kawada ◽  
Zen-Ichiro Kawasaki ◽  
Kenji Matsu-ura ◽  
Toshio Musashiya ◽  
Katsunori Otoba ◽  
...  
Keyword(s):  
Phase Difference ◽  
Difference Method ◽  
Partial Discharge ◽  
Spatial Phase ◽  
New System

scholarly journals Non-Contact Detection of Electromagnetic Noise Occurrence due to Partial Discharges by Spatial Phase Difference Method

1995 ◽  
Vol 115 (10) ◽  
pp. 1168-1173 ◽  
Author(s):  
Masatake Kawada ◽  
Zen-Ichiro Kawasaki ◽  
Kenji Matsu-ura ◽  
Makoto Kawasaki
Keyword(s):  
Phase Difference ◽  
Difference Method ◽  
Partial Discharges ◽  
Contact Detection ◽  
Electromagnetic Noise ◽  
Spatial Phase

scholarly journals On-Line Partial discharge Detection of Turbine Generator using GHz-Band Spatial Phase Difference Method

1998 ◽  
Vol 118 (11) ◽  
pp. 1243-1248 ◽  
Author(s):  
Masatake Kawada ◽  
Zen-Ichiro Kawasaki ◽  
Kenji Matsu-ura ◽  
Satoru Kuroki ◽  
Teruya Osawa ◽  
...  
Keyword(s):  
Phase Difference ◽  
Difference Method ◽  
Partial Discharge ◽  
Turbine Generator ◽  
Spatial Phase ◽  
On Line ◽  
Discharge Detection

Vehicle Propulsion by Solid State Motion

2014 ◽  
Author(s):  
Lucas Jones ◽  
Josh Spahnie ◽  
Kevin Lefeave ◽  
Charles Haltom ◽  
Adam Underwood ◽  
...  
Keyword(s):  
Phase Difference ◽  
Traveling Waves ◽  
Traveling Wave ◽  
Piezoelectric Actuators ◽  
Underwater Vehicle ◽  
Driving Frequency ◽  
Free Boundary Conditions ◽  
Vehicle Propulsion ◽  
Propulsion Mechanism ◽  
Resonance Frequencies

Traveling waves have shown the potential to transport material and are thus investigated as a propulsion mechanism. Through the use of piezoelectric actuators (PZTs), traveling waves were produced in beams with both free-free and fixed-free boundary conditions. It is shown that traveling waves can be generated by exciting two PZTs at a common frequency with a phase difference between the PZT signals. Experimentation showed the signal that creates the best traveling wave occurs at a driving frequency halfway between adjacent bending resonance frequencies and a phase difference of 90° between both PZTs signals. This has produced traveling waves in fixed-free beams and free-free beams in both air and water as well as for an underwater vehicle. These traveling waves generated useful propulsion in both the fixed-free and free-free beams.

On-line partial discharge detection of turbine generator using gigahertz-band spatial phase difference method

2000 ◽  
Vol 131 (4) ◽  
pp. 38-43 ◽  
Author(s):  
Masatake Kawada ◽  
Zen-ichiro Kawasaki ◽  
Kenji Matsu-ura ◽  
Satoru Kuroki ◽  
Teruya Osawa ◽  
...  
Keyword(s):  
Phase Difference ◽  
Difference Method ◽  
Partial Discharge ◽  
Turbine Generator ◽  
Spatial Phase ◽  
On Line ◽  
Discharge Detection
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