Modal decomposition for arbitrary dipole array

2017 ◽  
Author(s):  
Tomas Lonsky ◽  
Pavel Hazdra ◽  
Jan Kracek
Keyword(s):  
Modal Decomposition

scholarly journals Robust principal component analysis for modal decomposition of corrupt fluid flows

2020 ◽  
Vol 5 (5) ◽  
Author(s):  
Isabel Scherl ◽  
Benjamin Strom ◽  
Jessica K. Shang ◽  
Owen Williams ◽  
Brian L. Polagye ◽  
...  
Keyword(s):  
Principal Component Analysis ◽  
Fluid Flows ◽  
Principal Component ◽  
Component Analysis ◽  
Robust Principal Component Analysis ◽  
Modal Decomposition

scholarly journals Modal Decomposition Method for-BWR Stability Analysis

1998 ◽  
Vol 35 (8) ◽  
pp. 538-546 ◽  
Author(s):  
G. VERDÚ ◽  
D. GINESTAR ◽  
V. VIDAL ◽  
R. MIRÓ
Keyword(s):  
Stability Analysis ◽  
Decomposition Method ◽  
Modal Decomposition

Modal decomposition of velocity signals in a plane, turbulent wake

1989 ◽  
Vol 198 (-1) ◽  
pp. 255 ◽  
Author(s):  
B. Marasli ◽  
F. H. Champagne ◽  
I. J. Wygnanski
Keyword(s):  
Turbulent Wake ◽  
Modal Decomposition ◽  
Plane Turbulent Wake

Generation Mechanism of Broadband Whoosh Noise in an Automotive Turbocharger Centrifugal Compressor

2021 ◽  
pp. 1-35
Author(s):  
Rick Dehner ◽  
Pranav Sriganesh ◽  
Ahmet Selamet ◽  
Keith Miazgowicz
Keyword(s):  
Centrifugal Compressor ◽  
Combustion Engine ◽  
Three Dimensional ◽  
Leading Edge ◽  
Broadband Noise ◽  
Rotor Blades ◽  
Generation Mechanism ◽  
Primary Concern ◽  
Frequency Range ◽  
Modal Decomposition

Abstract The present study focuses on the acoustics of a turbocharger centrifugal compressor from a spark-ignition internal combustion engine. Whoosh noise is typically the primary concern for this type of compressor, which is loosely characterized by broadband sound elevation in the 4 to 13 kHz range. To identify the generation mechanism of broadband whoosh noise, the present study combines three approaches: three-dimensional (3D) computational fluid dynamics (CFD) predictions, experiments, and modal decomposition of 3D CFD results. After establishing the accuracy of predictions, flow structures and time-resolved pressures are closely examined in the vicinity of the main blade leading edge. This reveals the presence of rotating instabilities that may interact with the rotor blades to generate noise. An azimuthal modal decomposition is performed on the predicted pressure field to determine the number of cells and the frequency content of these rotating instabilities. The strength of the rotating instabilities and the frequency range in which noise is generated as a consequence of the rotor-rotating instability interaction, is found to correspond well with the qualitative trend of the whoosh noise that is measured several duct diameters upstream of the rotor blades. The variation of whoosh frequency range between low and high rotational speeds is interpreted through this analysis. It is also found that the whoosh noise primarily propagates along the duct as acoustic azimuthal modes. Hence, the inlet duct diameter, which governs the cut-off frequency for multi-dimensional acoustic modes, determines the lower frequency bound of the broadband noise.

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