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Keywords: wavelet transforms
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Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Vib. Acoust. August 2009, 131(4): 041012.
Published Online: June 18, 2009
... measured on bearings by discrete wavelet transform and subsequently performs the Fourier transform on the wavelet coefficients. The effectiveness of such a unified technique is demonstrated through experimental case studies, which confirmed its advantage over the wavelet or Fourier transform techniques...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Vib. Acoust. April 2009, 131(2): 024501.
Published Online: February 13, 2009
... is an approximation of the steepest descent algorithm ( 29 ) that is a simple but a slow minimization method. 29 06 2005 02 07 2008 13 02 2009 engine cylinders entropy feature extraction mechanical engineering wavelet transforms As machinery becomes more complex and costly...
Journal Articles
Publisher: ASME
Article Type: Research Papers
J. Vib. Acoust. October 2008, 130(5): 051007.
Published Online: August 14, 2008
... are preprocessed using Laplace-wavelet transform for features’ extraction. The extracted features for wavelet transform coefficients in time and frequency domains are applied as input vectors to artificial neural networks (ANNs) for rolling bearing fault classification. The Laplace-Wavelet shape and the ANN...
Journal Articles
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. August 2007, 129(4): 495–506.
Published Online: March 19, 2007
... of the processing of vibratory measurements. This processing can be made by temporal methods, frequential methods, or by time-scale methods using the wavelets for 2 decades. The wavelet transform is a very effective processing, however, the difficulties of application and interpretation of the results slow down...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. April 2007, 129(2): 169–178.
Published Online: September 19, 2006
... but the window bandwidth varies along frequency adaptively. The method therefore behaves more like an adaptive continuous wavelet transform. We use B-splines as the window functions, which have near optimal time–frequency localization, and derive a fast algorithm for adaptive time–frequency representation...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. October 2006, 128(5): 653–665.
Published Online: February 7, 2006
... conditions. These include steady synchronous forcing, step changes in synchronous forcing and multifrequency forcing produced by a rotor impact mechanism. 27 04 2005 07 02 2006 vibrations vibration control rotors adaptive control wavelet transforms control system synthesis three-term...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Vib. Acoust. June 2005, 127(3): 280–284.
Published Online: June 1, 2005
...Wen-xian Yang; Peter W. Tse The appearance of overlapping in the results derived by continuous wavelet transform (CWT) smears the spectral features and makes the results difficult to interpret. This will significantly affect the accuracy of analysis of anomalous signals. Aiming at minimizing...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. October 2004, 126(4): 567–573.
Published Online: December 21, 2004
...D. F. Shi; W. J. Wang; L. S. Qu In order to overcome the shortcomings in the traditional envelope analysis in which manually specifying a resonant frequency band is required, a new approach based on the fusion of the wavelet transform and envelope spectrum is proposed for detecting and localizing...
Journal Articles
Publisher: ASME
Article Type: Technical Briefs
J. Vib. Acoust. July 2004, 126(3): 449–451.
Published Online: July 30, 2004
... to be effective in detecting gear faults when cyclostationary analysis by itself fails. acoustic filters automotive components wavelet transforms vibrations gears fault diagnosis mechanical testing Wavelet analysis and cyclostationary analysis have both been employed to detect fault symptoms...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. April 2005, 127(2): 139–143.
Published Online: June 22, 2004
...Jin-Wei Liang; Brian F. Feeny Wavelet transforms were compared between various simulated friction models and real stick-slip data. While simulations of several models produced stick-slip transition oscillations seen in the real data, the wavelet features of the compliant contact model with light...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. January 2004, 126(1): 9–16.
Published Online: February 26, 2004
... wavelet transforms acoustic signal processing machine bearings maximum likelihood estimation signal processing Gaussian noise vibrations Early fault detection in machines can save millions of dollars on emergency maintenance and production loss costs. Gearboxes and roller bearings...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. April 2003, 125(2): 199–204.
Published Online: April 1, 2003
... the response data of the corresponding nonlinear system. Two time-frequency filtering methods are discussed here. One is based on the quadratic time-frequency distribution and its inverse transform, the other is based on the quadratic time-frequency distribution and the wavelet transform. Both numerical...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. April 2003, 125(2): 170–177.
Published Online: April 1, 2003
... time-frequency analysis wavelet transforms nonlinear dynamical systems acoustic signal processing structural acoustics The identification of nonlinear systems has received considerable attention in recent years because most real structures exhibit some degree of nonlinearity. Various...
Journal Articles
Publisher: ASME
Article Type: Technical Papers
J. Vib. Acoust. July 2001, 123(3): 303–310.
Published Online: March 1, 2001
..., 20A . Gade, S., and Gram-Hansen, K., 1996, “Non-stationary Signal Analysis Using Wavelet Transform, Short-time Fourier Transform and Wigner-Ville Distribution,” Bruel & Kjaer Technical Review, No. 2. Dowling, H. M., 1993, “Application of Non-stationary Analysis to Machinery Monitoring...