scholarly journals Data acquisition and imaging using wavelet transform: a new path for high speed transient force microscopy

2021 ◽  
Author(s):  
Amir Farokh Payam ◽  
Pardis Biglarbeigi ◽  
Alessio Morelli ◽  
Patrick Lemoine ◽  
James McLaughlin ◽  
...  
Keyword(s):  
Wavelet Transform ◽  
Data Acquisition ◽  
Data Stream ◽  
High Speed ◽  
New Approach ◽  
Force Microscopy ◽  
Transient Force

This paper introduces a fundamentally new approach for dynamic AFM data acquisition and imaging based on applying the wavelet transform on the data stream from the photodetector.

scholarly journals Feature Extraction Using Discrete Wavelet Transform for Gear Fault Diagnosis of Wind Turbine Gearbox

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Rusmir Bajric ◽  
Ninoslav Zuber ◽  
Georgios Alexandros Skrimpas ◽  
Nenad Mijatovic
Keyword(s):  
Wavelet Transform ◽  
Fault Diagnosis ◽  
Wind Turbine ◽  
Discrete Wavelet Transform ◽  
High Speed ◽  
Discrete Wavelet ◽  
New Approach ◽  
Condition Indicators ◽  
Gear Fault ◽  
Gear Fault Diagnosis

Vibration diagnosis is one of the most common techniques in condition evaluation of wind turbine equipped with gearbox. On the other side, gearbox is one of the key components of wind turbine drivetrain. Due to the stochastic operation of wind turbines, the gearbox shaft rotating speed changes with high percentage, which limits the application of traditional vibration signal processing techniques, such as fast Fourier transform. This paper investigates a new approach for wind turbine high speed shaft gear fault diagnosis using discrete wavelet transform and time synchronous averaging. First, the vibration signals are decomposed into a series of subbands signals with the use of a multiresolution analytical property of the discrete wavelet transform. Then, 22 condition indicators are extracted from the TSA signal, residual signal, and difference signal. Through the case study analysis, a new approach reveals the most relevant condition indicators based on vibrations that can be used for high speed shaft gear spalling fault diagnosis and their tracking abilities for fault degradation progression. It is also shown that the proposed approach enhances the gearbox fault diagnosis ability in wind turbines. The approach presented in this paper was programmed in Matlab environment using data acquired on a 2 MW wind turbine.

Data acquisition system for high speed atomic force microscopy

2005 ◽  
Vol 76 (2) ◽  
pp. 026118 ◽  
Author(s):  
Georg E. Fantner ◽  
Paul Hegarty ◽  
Johannes H. Kindt ◽  
Georg Schitter ◽  
Geraldo A. G. Cidade ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Data Acquisition ◽  
High Speed ◽  
Data Acquisition System ◽  
Acquisition System ◽  
Force Microscopy ◽  
Atomic Force
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