Order Tracking Filtering for Rotating Machinery Diagnosis Based on Zero Phase Distortion Digital Filtering

2005 ◽  
pp. 747-752
Author(s):  
S.R. Qin ◽  
Y. Guo
Keyword(s):  
Digital Filtering ◽  
Rotating Machinery ◽  
Phase Distortion ◽  
Order Tracking ◽  
Zero Phase

Order Tracking Filtering for Rotating Machinery Diagnosis Based on Zero Phase Distortion Digital Filtering

2005 ◽  
Vol 295-296 ◽  
pp. 747-752
Author(s):  
S.R. Qin ◽  
Y. Guo
Keyword(s):  
Frequency Estimation ◽  
Digital Filtering ◽  
Rotating Machinery ◽  
Phase Distortion ◽  
New Method ◽  
Instantaneous Frequency Estimation ◽  
Order Tracking ◽  
Run Up ◽  
Tracking Filter ◽  
Zero Phase

A new method for order tracking filtering of rotating machinery based on instantaneous frequency estimation and zero-phase distortion digital filtering is proposed. Compared with the traditional methods for order tracking filtering, the new method has a number of attractive features such as tacholess, no hardware-based tracking filter and no frequency shift to the original sampling data. The theorems and algorithms of the method are discussed. Filtering of overlapped data blocks, used to restrain the edge effect, which is caused by digital filtering, is introduced. An actual test example of run-up and coast down vibration of a motor is presented to demonstrate the validity of the method.

Order Tracking Filtering Based on Instantaneous Frequency Estimation and Zero-Phase Distortion Digital Filtering

2003 ◽  
Author(s):  
Shuren Qin ◽  
Yu Guo
Keyword(s):  
Instantaneous Frequency ◽  
Frequency Estimation ◽  
Digital Filtering ◽  
Vibration Signal ◽  
Phase Distortion ◽  
Instantaneous Frequency Estimation ◽  
Order Tracking ◽  
Run Up ◽  
Tracking Filter ◽  
Zero Phase

A new method for run-up or coast down vibration signal order tracking filtering of rotating machinery based on instantaneous frequency estimation and zero-phase distortion digital filtering is proposed in this paper. By contrast with traditional methods of order tracking filtering, the features of tacholess, no hardware-based tracking filter required and no frequency shift to original sampling data, etc, make it more attractive. The theorems and algorithms of the method are detailed discussed in this paper. The filtering of overlapped data blocks is used to restrain the edge effect, which caused by digital filtering, is also introduced. An actual test example of a motor’s run-up and coast down vibration is introduced to demonstrate the validity of the method.

Application of Zero-Phase Digital Filter in Magnetic Flux Leakage Testing for Tank Floor Inspection

2013 ◽  
Vol 333-335 ◽  
pp. 1644-1648
Author(s):  
Fu Jun Liu ◽  
Zhang Wei Ling ◽  
Shuai Kong ◽  
Mu Lin Zheng
Keyword(s):  
Magnetic Flux ◽  
Digital Filter ◽  
Signal To Noise Ratio ◽  
Phase Distortion ◽  
Magnetic Flux Leakage ◽  
Location Accuracy ◽  
Phase Filter ◽  
Testing Technology ◽  
Flux Leakage ◽  
Zero Phase

Magnetic flux leakage (MFL) testing, as a modern nondestructive testing technology, has significant application in tank floor corrosion defect inspection. In view of signal characteristics in the MFL testing of tank floor, an improved signal progressing method combining software and hardware was presented. Especially, in order to avoid phase distortion caused by applying common digital filter, zero-phase digital filter which could effectively eliminate the phase distortion was proposed to improve the location accuracy of defect. Experiment results showed that the signal progressing method could improve signal-to-noise ratio, and the peak-peak value of defect signal had a good linear relationship with the depth of defect which showed that the proposed method could meet the requirement of the MFL testing. Comparing results showed that, the maximal location error of zero-phase filter was 2 mm and that of common digital filter was 24 mm, which showed that zero-phase filter had better defect location accuracy.

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