scholarly journals Influence of selected geometric parameters on strength properties of compressor’s jet engine blade joint

Mechanik ◽  
2016 ◽  
pp. 740-741
Author(s):  
Adam Kozakiewicz ◽  
Olga Grzejszczak
Keyword(s):  
Strength Properties ◽  
Geometric Parameters ◽  
Jet Engine ◽  
Engine Blade

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.

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 JUSTIFICATION AND CHOOSING OF RATIONAL CONSTRUCTIVE CROSSSECTIONS, POSSIBILITIES OF USING IN DIFFERENT CONSTRUCTION DIRECTIONS

2021 ◽  
pp. 20-25
Author(s):  
Svitlana Deryzemlia
Keyword(s):  
Bearing Capacity ◽  
Building Materials ◽  
Concrete Structures ◽  
Strength Properties ◽  
Geometric Parameters ◽  
Building Structures ◽  
Concrete Elements ◽  
Significant Attention ◽  
Modern Building ◽  
Made In

The development of modern construction is closely related to the efficient use problemof building materials in terms of rational use materials’ strength properties. The search of rationalstructure in terms of geometric parameters, the materials use and providing the same bearingcapacity is important question in the modern building. The purpose of article is to carry out acomparative analysis of the geometric and strength characteristics of different reinforced concretecross-sections, and consideration of existing methods for calculating the bearing capacity andassessment of the stress-strain state of reinforced concrete beams.The steel-concrete structures using in different building structures is paid much attention in theworld practice. The steel-concrete structures widespread using leads to the economy of materials,reducing the complexity of manufacture, reducing time erection. The using of reinforced concreteleads to significant economy of steel, and set the new tasks for the engineers in the same time: ownweight and geometric parameters reducing of the cross-section without reducing of bearing capacityin whole. With the search for new structures that would meet the building requirements and usage ofdifferent building, nowadays significant attention pays to the improvement and development of thesteel-concrete elements. During the development and improvement of steel-concrete structures,significant changes have been made in terms of ensuring the joint operation of reinforced concreteand steel. Such structures require constant research and improvement in order to reduce their ownweight, financial costs, etc. The question of finding a rational structure in terms of geometricparameters, the materials using, as well as ensuring the same bearing capacity is currently important

scholarly journals Research on Machining Fixture of Near-Net-Shaped Jet Engine Blade

2019 ◽  
Vol 616 ◽  
pp. 012004
Author(s):  
Dongbo Wu ◽  
Yunhai Chen ◽  
Xuesong Zhen ◽  
Kaiyao Zhang
Keyword(s):  
Jet Engine ◽  
Engine Blade
Sign in / Sign up

Export Citation Format

Share Document