scholarly journals Model-scale jet noise analysis with a single-point, frequency-domain nonlinearity indicator

2018 ◽  
Vol 143 (6) ◽  
pp. 3479-3492 ◽  
Author(s):  
Kyle G. Miller ◽  
Kent L. Gee
Keyword(s):  
Frequency Domain ◽  
Noise Analysis ◽  
Single Point ◽  
Jet Noise ◽  
Model Scale

scholarly journals Precision Imaging of Frequency Stepped SAR with Frequency Domain Extracted HRRP and Fast Factorized Back Projection Algorithm

2017 ◽  
Vol 2017 ◽  
pp. 1-13
Author(s):  
Can-bin Yin ◽  
Da Ran
Keyword(s):  
Fourier Transform ◽  
Frequency Domain ◽  
Single Point ◽  
Projection Algorithm ◽  
Great Promise ◽  
Back Projection ◽  
Imaging Processing ◽  
Block Partition ◽  
Range Resolution ◽  
High Range

Novel frequency domain extracted method (FDEM) to obtain high range resolution profile (HRRP) for frequency stepped synthetic aperture radar (SAR) is proposed in this paper, and the mathematical principle and formulas of this new HRRP obtaining idea combined with classical fast Fourier transform (FFT), chirp z transform (CZT), and single point Fourier transform (SPFT) are deduced, analyzed, and compared in detail. Based on the HRRP data, precision imaging processing is completed using a data block partition based fast factorized back projection algorithm. Imaging validations are executed and all results proved that the FDEM has a great capability of antijamming. It is more effective than conventional time domain IFFT method (TDM) and shows a great promise in frequency stepped radar imaging and applications.

Electrochemical noise analysis of a PEM fuel cell stack under long-time operation: noise signature in the frequency domain

2020 ◽  
Vol 24 (11-12) ◽  
pp. 3059-3071 ◽  
Author(s):  
S. Martemianov ◽  
A. Thomas ◽  
N. Adiutantov ◽  
E. Denisov ◽  
Yu Evdokimov ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Frequency Domain ◽  
Electrochemical Noise ◽  
Noise Analysis ◽  
Pem Fuel Cell ◽  
Fuel Cell Stack ◽  
Time Operation ◽  
Long Time ◽  
Noise Signature

On the Prediction of Turbulent Jet Noise Using Traditional Aeroacoustic Methods

2005 ◽  
Vol 4 (3) ◽  
pp. 289-323 ◽  
Author(s):  
K.M. Khritov ◽  
V.Ye. Kozlov ◽  
S.Yu. Krasheninnikov ◽  
A.B. Lebedev ◽  
D.A. Lyubimov ◽  
...  
Keyword(s):  
Single Point ◽  
Jet Noise ◽  
Point Of View ◽  
Turbulent Jet ◽  
Prediction Methods ◽  
Noise Prediction ◽  
Classical Literature ◽  
Boeing Company ◽  
The Many ◽  
Theoretical Results

Several experimental, computational and theoretical results devoted to turbulence jet noise are described. All these results were obtained at CIAM in collaboration with the Boeing Company. The selected topics are combined and described from a single point of view. In spite of the many publications in the classical literature devoted to jet noise, many jet noise problems are not completely solved, and most current jet noise prediction methods are still highly empirical and rely heavily on an existing experimental data base. At the same time, many of the available experimental results are not fully reliable and some are even contradictory. The goal of this paper is, therefore, to explore and discuss some of the possibilities and limitations of classical aeroacoustics methods.

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