Experimental study on transmission abnormal sound based on side-band frequency analysis

2011 ◽  
Author(s):  
Yao Yunshi ◽  
Feng Zhongxu ◽  
Ma Fangwu ◽  
Wu Wei ◽  
Liu Qiang
Keyword(s):  
Experimental Study ◽  
Frequency Analysis ◽  
Band Frequency ◽  
Side Band ◽  
Abnormal Sound

scholarly journals Flash-Related Synchronization and Desynchronization Revealed by a Multiple Band Frequency Analysis.

2000 ◽  
Vol 50 (5) ◽  
pp. 553-559 ◽  
Author(s):  
Ichiro Shimoyama ◽  
Yasuhumi Kasagi ◽  
Takehito Kaiho ◽  
Tadahiko Shibata ◽  
Yoshio Nakajima ◽  
...  
Keyword(s):  
Frequency Analysis ◽  
Band Frequency ◽  
Multiple Band

Fault Prediction of Induction Motor Based on Time-Frequency Analysis

2011 ◽  
Vol 52-54 ◽  
pp. 115-120 ◽  
Author(s):  
Juggrapong Treetrong
Keyword(s):  
Frequency Analysis ◽  
Good Accuracy ◽  
Fault Prediction ◽  
Side Band ◽  
Time Frequency Analysis ◽  
Time Frequency ◽  
Spectrum Method ◽  
Rotor Faults ◽  
Fault Severity ◽  
Motor Condition

Because the faults happening in the motor (such as the stator and the rotor faults) can distort the sinusoidal response of the motor RPM and the main frequency, hence the spectrum method has previously been introduced which it relates to both amplitudes and phases among harmonics in a signal. The method popularly applied for fault detection is based on frequency analysis by observing the side band, its harmonics around main frequencies or its other harmonics. Based on the present experiments, the spectrum method by FFT function has ability to distinguish the motor condition. But, the fault severity levels seem to not able to analyze. Hence the time-frequency Analysis (or spectrogram) of the stator phase currents is proposed here. The method is expected to show relation between the phase current signals and the fault levels which make it can detect the faults and also indicate the fault levels. The experiments show that the proposed method can provide good accuracy for fault prediction and fault level quantification. Hence it can conclude that the propose method can be an effective tool for motor fault prediction.

Dynamic Changes of Ictal High-Frequency Oscillations in Neocortical Epilepsy: Using Multiple Band Frequency Analysis

Epilepsia ◽  
2007 ◽  
Vol 48 (2) ◽  
pp. 286-296 ◽  
Author(s):  
Ayako Ochi ◽  
Hiroshi Otsubo ◽  
Elizabeth J. Donner ◽  
Irene Elliott ◽  
Ryoichi Iwata ◽  
...  
Keyword(s):  
Frequency Analysis ◽  
High Frequency ◽  
Dynamic Changes ◽  
Band Frequency ◽  
High Frequency Oscillations ◽  
Multiple Band ◽  
Neocortical Epilepsy
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