Application of Zero‐phase Digital Filtering for Effective Denoising of FAIMS Signal

2021 ◽  
Author(s):  
Junhui Li ◽  
Wenqing Gao ◽  
Huanming Wu ◽  
Shoudong Shi ◽  
Jiancheng Yu ◽  
...  
Keyword(s):  
Digital Filtering ◽  
Zero Phase

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.

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.

A REVIEW OF METHODS OF FILTERING SEISMIC DATA

Geophysics ◽  
1958 ◽  
Vol 23 (1) ◽  
pp. 44-57 ◽  
Author(s):  
Mark K. Smith
Keyword(s):  
Seismic Data ◽  
Cross Correlation ◽  
Delay Line ◽  
Digital Filtering ◽  
Design Criteria ◽  
General Sense ◽  
New Methods ◽  
The Relationship ◽  
Zero Phase ◽  
Correlation Filtering

Filtering in its general sense represents an important phase of data processing. In recent years such new methods as delay line filtering and digital filtering as well as conventional seismic filtering have been described in the literature. The purpose of this paper is to clarify the relationship between these methods of filtering and to compare design criteria such as cross‐correlation filtering and zero‐phase filtering. Synthetic records as well as field records are used to illustrate the effects of the various filtering techniques.

A Comparative Study of Digital Filtering Techniques in Ultrasound and Carotid Bifurcation Atherosclerosis

2018 ◽  
Vol 1 (1) ◽  
pp. 5-12
Author(s):  
Adriana Milășan ◽  
◽  
Cristian Molder ◽  
Silviu Dumitrescu ◽  
◽  
...  
Keyword(s):  
Comparative Study ◽  
Digital Filtering ◽  
Carotid Bifurcation ◽  
Filtering Techniques

Study on a DC-DC Converter using a Three-Phase Transformer with Zero-Phase Current

2020 ◽  
Vol 140 (10) ◽  
pp. 760-768
Author(s):  
Yuki Itogawa ◽  
Takeshi Amimoto ◽  
Yu Kawai ◽  
Tatsuya Okuda
Keyword(s):  
Phase Current ◽  
Three Phase ◽  
Zero Phase
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