Array processing methods for the determination of reflection properties of architectural surfaces

2015 ◽  
Vol 137 (4) ◽  
pp. 2195-2195
Author(s):  
Markus Müller-Trapet ◽  
Michael Vorländer
Keyword(s):  
Array Processing ◽  
Processing Methods

Analysis of Stall Precursors and Determination of Optimum Signal Processing Methods for an LM-2500 Gas Turbine

2008 ◽  
Author(s):  
Knox T. Millsaps ◽  
Gustave C. Dahl ◽  
Daniel E. Caguiat ◽  
Jeffrey S. Patterson
Keyword(s):  
Time Series ◽  
Signal Processing ◽  
Gas Turbine ◽  
Rotor Speed ◽  
Processing Methods ◽  
Turbine Engine ◽  
Pressure Signal ◽  
Time Series Analyses ◽  
Signal Processing Methods

This paper presents an analysis of data taken from several stall initiation events on a GE LM-2500 gas turbine engine. Specifically, the time series of three separate pressure signals located at compressor stages 3, 6, and 15 were analyzed utilizing various signal processing methods to determine the most reliable indicator of incipient stall for this engine. The spectral analyses performed showed that rotating precursor waves traveling around the annulus at approximately half of the rotor speed were the best indicators. Non-linear chaotic time series analyses were also used to predict stall, but it was not as reliable an indicator. Several algorithms were used and it was determined that stall wave perturbations can be reliably identified about 900 revolutions prior to the stall. This work indicates that a single pressure signal located at stage 3 on an LM-2500 gas turbine is sufficient to provide advance warning of more than 2 seconds prior to the fully developed stall event.

scholarly journals Investigation of NIR spectra pre-processing methods combined with multivariate regression for determination of moisture in powdered industrial egg

2018 ◽  
Vol 40 (1) ◽  
pp. 30133
Author(s):  
Lycio Shinji Watanabe ◽  
Yuri Renan Bovolenta ◽  
Vinicius Ricardo Acquaro Junior ◽  
Douglas Fernandes Barbin ◽  
Tiago Bervelieri Madeira ◽  
...  
Keyword(s):  
Multivariate Regression ◽  
Processing Methods

Borehole acoustic array processing methods: A review

2014 ◽  
Vol 136 (4) ◽  
pp. 2255-2255
Author(s):  
Said Assous ◽  
Peter Elkington
Keyword(s):  
Array Processing ◽  
Processing Methods ◽  
Acoustic Array
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