Dielectric response measurement of oil-paper insulation based on system identification and its time-frequency-domain conversion method

2018 ◽  
Vol 25 (5) ◽  
pp. 1688-1698 ◽  
Author(s):  
Lijun Yang ◽  
Junru Chen ◽  
Songhua Wang ◽  
Jun Gao
Keyword(s):  
System Identification ◽  
Frequency Domain ◽  
Dielectric Response ◽  
Response Measurement ◽  
Time Frequency ◽  
Conversion Method ◽  
Paper Insulation

On the frequency domain dielectric response of oil-paper insulation at low temperatures

2010 ◽  
Vol 17 (3) ◽  
pp. 799-807 ◽  
Author(s):  
I. Fofana ◽  
H. Hemmatjou ◽  
F. Meghnefi ◽  
M. Farzaneh ◽  
A. Setayeshmehr ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Low Temperatures ◽  
Dielectric Response ◽  
Paper Insulation

Study on the Defects Size of Ball Bearings Elements Using Vibration Analysis

2014 ◽  
Vol 658 ◽  
pp. 289-294 ◽  
Author(s):  
Carmen Bujoreanu ◽  
Razvan Monoranu ◽  
N. Dumitru Olaru
Keyword(s):  
Frequency Domain ◽  
Vibration Analysis ◽  
Ball Bearing ◽  
Fault Detection And Diagnosis ◽  
Response Measurement ◽  
Time Frequency ◽  
Bearing Life ◽  
Rolling Element ◽  
Detection And Diagnosis ◽  
The Time Domain

The vibration analysis aims to extract features from the measurements in order to be used for fault detection and diagnosis. Vibration response measurement is an important and effective technique for the detection of the defects in rolling element bearings. The corresponding analysis methods operate in the time domain, in the frequency domain and recently in the time-frequency domain. A quantitative determination of the defect severity and its development are useful to be determined in order to estimate the remaining useful ball bearing life. Experimental data from a bearing with a defect are collected by an accelerometer then processed to identify the passing time of a ball over a defect. The paper presents a computation model corroborated to an experimental investigation to establish the defect length of a ball bearing inner race.

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