scholarly journals Highly sensitive methods for vibration diagnostics of fatigue damage in structural elements of aircraft gas turbine engines

2022 ◽  
Vol 35 ◽  
pp. 74-81
Author(s):  
A. Bovsunovsky ◽  
O. Nosal
Keyword(s):  
Gas Turbine ◽  
Fatigue Damage ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Structural Elements ◽  
Vibration Diagnostics ◽  
Highly Sensitive

scholarly journals VIBRATION DIAGNOSTICS OF FATIFUE DAMAGE IN STRUCTURAL ELEMENTS OF GAS TURBINE ENGINES AT THE REPAIR STAGE

2021 ◽  
pp. 5-14
Author(s):  
Anatoliy Bovsunovsky
Keyword(s):  
Fatigue Crack ◽  
Gas Turbine ◽  
Vibration Response ◽  
Mode Shapes ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Structural Elements ◽  
Vibration Diagnostics ◽  
Superharmonic Resonance ◽  
Long Time

Vibration diagnostics of damage belongs to the class of non-destructive methods, which usually do not take long time. However, the main problem of vibration diagnostics is relatively low sensitivity to the critical damage of fatigue crack type, which arises because of long time accumulation of plastic deformation. To improve the sensitivity and reliability of vibration diagnostics of damage two methods were considered. First method was based on the fact, that a characteristic feature of vibrations of structural elements with fatigue crack is the occurrence of non-linear resonances (sub- and super-harmonic) and significant non-linearity of vibration response at these resonances. Secon one – on the fact, that quite noticeable in certain cases increase of damping characteristic caused by a crack can be observed. Analytical and experimental studies of these methods were carried out as applied to the blades of aircraft gas turbine engines. As a result of the studies, the intensity of change in parameter of super-harmonic resonance and in damping characteristics at different parameters of crack was determined. Besides, the experimental techniques for vibration testing of turbine blades were developed. There was demonstrated, that the sensitivity of both considered methods of vibration diagnostics is several orders of magnitude higher than the sensitivity of conventional methods based on the change in natural frequencies and mode shapes, and they can be effectively used for the diagnostics of blades on the stage of engine repair. All the other conditions being equal, second-order superharmonic resonance demonstrates a higher sensitivity to the presence of cracks than the damping characteristic. The smallest crack with an area of 0.2% considered in the work causes a reliably recorded non-linearity of vibration response at superharmonic resonance of order of 2/1. At this the change of damping characteristic slightly exceeds the error of experiment.

Degradation of the surface layers of superalloys and thermal-fatigue damage to the structural elements of gas-turbine engines

2008 ◽  
Vol 40 (5) ◽  
pp. 552-559 ◽  
Author(s):  
L. V. Kravchuk ◽  
R. I. Kuriat ◽  
K. P. Buiskikh ◽  
S. G. Kiselevskaya
Keyword(s):  
Gas Turbine ◽  
Fatigue Damage ◽  
Thermal Fatigue ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Structural Elements ◽  
Surface Layers

scholarly journals Single-Coil Eddy Current Sensors and Their Application for Monitoring the Dangerous States of Gas-Turbine Engines

Sensors ◽  
2020 ◽  
Vol 20 (7) ◽  
pp. 2107 ◽  
Author(s):  
Sergey Borovik ◽  
Yuriy Sekisov
Keyword(s):  
Gas Turbine ◽  
Eddy Current ◽  
Natural Aging ◽  
Turbine Engines ◽  
Radial Clearance ◽  
Gas Turbine Engines ◽  
Structural Elements ◽  
Single Coil ◽  
The Impact ◽  
Blade Tips

The creation and exploitation of gas turbine engines (GTE) often involve two mutually exclusive tasks related to ensuring the highest reliability while achieving a good economic and environmental performance of the power plant. The value of the radial clearance between the blade tips of the compressor or turbine and the stator is a parameter that has a significant impact on the efficiency and safety of the GTE. However, the radial displacements that form tip clearances are only one of the components of the displacements made by GTE elements due to the action of power loads and thermal deformations during engines’ operation. The impact of loads in conjunction with natural aging is also the reason for the wear of the GTE’s structural elements (for example, bearing assemblies) and the loss of their mechanical strength. The article provides an overview of the methods and tools for monitoring the dangerous states of the GTE (blade tips clearances, impellers and shafts displacements, debris detecting in lubrication system) based on the single-coil eddy current sensor, which remains operational at the temperatures above 1200 °C. The examples of practical application of the systems with such sensors in bench tests of the GTE are given.

Vibration diagnostics of gas turbine engines bearing assemblies technical condition with rhythmograms and scatterograms

2021 ◽  
Vol 28 (4) ◽  
pp. 151-162
Author(s):  
Dmitry A. Balakin ◽  
Alexey I. Zubko ◽  
Anna A. Zubko ◽  
Vitaly V. Shtykov
Keyword(s):  
Gas Turbine ◽  
Technical Condition ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Vibration Diagnostics

scholarly journals Operational causes of fatigue failures within passages of gas turbine engines

2010 ◽  
Vol 17 (1) ◽  
pp. 57-61 ◽  
Author(s):  
Zbigniew Korczewski
Keyword(s):  
Gas Turbine ◽  
Gas Flow ◽  
Low Cycle Fatigue ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Structural Elements ◽  
Fatigue Wear ◽  
Flow Paths ◽  
Wear Process ◽  
Fatigue Failures

Operational causes of fatigue failures within passages of gas turbine engines In this paper a short presentation of fatigue wear process of structural elements of gas turbine engines has been given. The primary causes of fatigue crack formation within engine mechanical system and flow passages have been highlighted. Special attention was paid to low-cycle fatigue associated with unsteady heat-and-gas-flow processes developed in the passages. The selected damages have been demonstrated of gas flow paths of the engines operating in aviation, navy and power industry, along with origins of their formation and growth.

scholarly journals Vibration diagnostics of equipment units with gas turbine engines

2019 ◽  
Vol 25 ◽  
pp. 89-94 ◽  
Author(s):  
Natalia Barkova ◽  
Aleksey Barkov ◽  
Dmitriy Grishchenko
Keyword(s):  
Gas Turbine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Vibration Diagnostics

Gas Screen in Components of Gas Turbine Engines

1997 ◽  
Vol 28 (7-8) ◽  
pp. 536-542
Author(s):  
A. A. Khalatov ◽  
I. S. Varganov
Keyword(s):  
Gas Turbine ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Gas Screen

Potential Application of Composite Materials to Future Gas Turbine Engines

1988 ◽  
Author(s):  
James C. Birdsall ◽  
William J. Davies ◽  
Richard Dixon ◽  
Matthew J. Ivary ◽  
Gary A. Wigell
Keyword(s):  
Composite Materials ◽  
Gas Turbine ◽  
Potential Application ◽  
Turbine Engines ◽  
Gas Turbine Engines
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