Defect measurement using the laser ultrasonic technique based on power spectral density analysis and wavelet packet energy

2021 ◽  
Author(s):  
Junya Yu ◽  
Chuanliang Li ◽  
Xuanbing Qiu ◽  
Huiqin Chen ◽  
Weiwei Zhang
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Wavelet Packet ◽  
Ultrasonic Technique ◽  
Laser Ultrasonic ◽  
Power Spectral ◽  
Density Analysis ◽  
Power Spectral Density Analysis

Extraction Feature of Spindle Unbalance of Machine Tool Based on the Wavelet Transform

2011 ◽  
Vol 279 ◽  
pp. 313-317
Author(s):  
Dong Ju Chen ◽  
Jin Wei Fan ◽  
Fei Hu Zhang
Keyword(s):  
Wavelet Transform ◽  
Spectral Density ◽  
Machine Tool ◽  
Power Spectral Density ◽  
Frequency Signal ◽  
High Frequency Signal ◽  
Power Spectral ◽  
Density Analysis ◽  
Power Spectral Density Analysis ◽  
Flatness Error

A new method for extracting spectrum feature of spindle unbalance of machine tool is proposed. The flatness error of workpiece surface includes much errors information, and the information contains high frequency signal and low frequency signal. For these errors information, a new identification method of turning errors of workpiece based on the wavelet transform and power spectral density analysis is proposed. According to the focal variation character of wavelet and the energy value of power spectral density analysis, the feature of spindle unbalance from the measured flatness error of workpiece is extracted and identified.

Angular resolved power spectral density analysis for improving mirror manufacturing

2018 ◽  
Vol 57 (29) ◽  
pp. 8692 ◽  
Author(s):  
Tom Pertermann ◽  
Johannes Hartung ◽  
Matthias Beier ◽  
Marcus Trost ◽  
Sven Schröder ◽  
...  
Keyword(s):  
Spectral Density ◽  
Power Spectral Density ◽  
Power Spectral ◽  
Density Analysis ◽  
Power Spectral Density Analysis
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