Automatic algorithm for estimating the jet engine blade number from the radar target signature of aircraft targets

2015 ◽  
Vol 30 (7) ◽  
pp. 18-29 ◽  
Author(s):  
Woo Yong Yang ◽  
Ji Hoon Park ◽  
Jun Woo Bae ◽  
Noh Hoon Myung ◽  
Chan Hong Kim
Keyword(s):  
Radar Target ◽  
Jet Engine ◽  
Blade Number ◽  
Engine Blade ◽  
Automatic Algorithm

scholarly journals A Novel Automatic Algorithm for Estimating the Jet Engine Blade Number of Insufficient JEM Signals

2021 ◽  
Vol 21 (5) ◽  
pp. 417-424
Author(s):  
Woo-Yong Yang ◽  
Dal-Jae Yun ◽  
Dong-Wook Seo
Keyword(s):  
Frequency Domain Method ◽  
Intrinsic Mode Functions ◽  
Jet Engine ◽  
Blade Number ◽  
Domain Method ◽  
Mode Decomposition ◽  
Engine Blade ◽  
Low Pass ◽  
The Time Domain ◽  
Automatic Algorithm

One of the major issues in multifunction radars is time resource allocation to maximize the radar’s ability. If jet engine modulation (JEM) is more efficiently performed in an insufficient dwell-time environment, the remaining time can be allocated for other tasks. This study presents a novel automatic algorithm for estimating the jet engine blade number of insufficient JEM signals. We employed a harmonic selection rule and a modified empirical mode decomposition (EMD) with an adaptive low-pass filtering. For a refined autocorrelation waveform, the analysis focuses on a desirable combination of intrinsic mode functions derived from the modified EMD. The approach is significant because it enables reliable estimation despite the insufficient JEM signal. Also, the proposed algorithm is innovative because it uses only the time-domain method, not the frequency-domain method. The application is expected to enhance the efficiency of radar resource management.

scholarly journals Automatic Algorithm for Extracting the Jet Engine Information from Radar Target Signatures of Aircraft Targets

2014 ◽  
Vol 25 (6) ◽  
pp. 690-699 ◽  
Author(s):  
Woo-Yong Yang ◽  
Ji-Hoon Park ◽  
Jun-Woo Bae ◽  
Seong-Cheol Kang ◽  
Chan-Hong Kim ◽  
...  
Keyword(s):  
Radar Target ◽  
Jet Engine ◽  
Automatic Algorithm

Monocarbide Characterization In Nickel-Base Mc Aligned Eutectics

1981 ◽  
Vol 12 ◽  
Author(s):  
M.R. Jackson ◽  
M.F.X. Gigliotti ◽  
S.W. Yang ◽  
J.L. Walter
Keyword(s):  
Chemical Analysis ◽  
Lattice Parameter ◽  
Lattice Parameters ◽  
Quantitative Chemical Analysis ◽  
Eutectic Alloys ◽  
Free Energies ◽  
Jet Engine ◽  
Engine Blade ◽  
Nickel Base ◽  
Quantitative Chemical

ABSTRACTIn the aligned Ni-MC eutectic alloys being developed for jet engine blade applications, the fibers are considered to be Tac, Tic, etc. In fact, these fibers will contain Cr, Mo, W and possibly other elements as substitutions for the “M” constituent, and often will not be stoichiometric. Quantitative chemical analysis of fibers is difficult because of their size. However, lattice parameter measurements can be used to learn much a out the carbide chemistry and stoichiometry. Results will be described in detail for fibers extracted from simple Ni-TaC, Ni,Cr-TaC and Ni,Cr,AI-Tac systems. In addition, experiments on mixed (Ta,V)C and (Ta,Ti)C carbides will be discussed. Carbide lattice parameters can be understood in terms of the free energies of formation of the various carbides.

Optimal milling modes identification of a jet-engine blade using time-domain technique

2020 ◽  
Vol 107 (5-6) ◽  
pp. 1983-1992 ◽  
Author(s):  
S. Nikolaev ◽  
I. Kiselev ◽  
V. Kuts ◽  
S. Voronov
Keyword(s):  
Time Domain ◽  
Jet Engine ◽  
Engine Blade

scholarly journals Optimizing Instrumentation When Measuring Jet Engine Blade Vibration

1991 ◽  
Author(s):  
J. H. Griffin
Keyword(s):  
Analytical Model ◽  
Blade Vibration ◽  
Alternative Strategies ◽  
Jet Engine ◽  
Bladed Disk ◽  
Statistical Variations ◽  
Engine Blade ◽  
System Frequency

An analytical model of bladed disk vibration is used to calculate the statistical variations in blade amplitudes that can occur in mistuned turbomachinery blading. The results provide a basis for evaluating alternative strategies for instrumenting the stage. This approach is illustrated by applying it to an unshrouded fan stage. It is found for this stage that the best strategy is to instrument blades that have frequencies near the tuned system frequency. A procedure is proposed for establishing how gages should be allocated from stage to stage throughout the engine.

Optimizing Instrumentation When Measuring Jet Engine Blade Vibration

1992 ◽  
Vol 114 (2) ◽  
pp. 217-221 ◽  
Author(s):  
J. H. Griffin
Keyword(s):  
Analytical Model ◽  
Blade Vibration ◽  
Alternative Strategies ◽  
Jet Engine ◽  
Bladed Disk ◽  
Statistical Variations ◽  
Engine Blade ◽  
System Frequency

An analytical model of bladed disk vibration is used to calculate the statistical variations in blade amplitudes that can occur in mistuned turbomachinery blading. The results provide a basis for evaluating alternative strategies for instrumenting the stage. This approach is illustrated by applying it to an unshrouded fan stage. It is found for this stage that the best strategy is to instrument blades that have frequencies near the tuned system frequency. A procedure is proposed for establishing how gages should be allocated from stage to stage throughout the engine.

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