The Lempel–Ziv measure based pedigree map to detect and evaluate correlation between aero-engine gas path system variables

2019 ◽  
Vol 525 ◽  
pp. 1080-1087 ◽  
Author(s):  
Keqiang Dong ◽  
Linan Long ◽  
Hong Zhang ◽  
Xieyang Su
Keyword(s):  
Aero Engine ◽  
Path System ◽  
System Variables

Cross-Correlations and Structures of Aero-Engine Gas Path System Based on DCCA Coefficient and Rooted Tree

2015 ◽  
Vol 14 (02) ◽  
pp. 1550014 ◽  
Author(s):  
Keqiang Dong ◽  
Jie Fan ◽  
You Gao
Keyword(s):  
Complex System ◽  
Cross Correlation ◽  
Pressure Ratio ◽  
Rooted Tree ◽  
Coefficient Matrix ◽  
Rotor Speed ◽  
Gas Temperature ◽  
Cross Correlation Analysis ◽  
Aero Engine ◽  
Path System

Identifying the mutual interaction is a crucial problem that facilitates the understanding of emerging structures in complex system. We here focus on aero-engine dynamic as an example of complex system. By applying the detrended cross-correlation analysis (DCCA) coefficient method to aero-engine gas path system, we find that the low-spool rotor speed (N1) and high-spool rotor speed (N2) fluctuation series exhibit cross-correlation characteristic. Further, we employ detrended cross-correlation coefficient matrix and rooted tree to investigate the mutual interactions of other gas path variables. The results can infer that the exhaust gas temperature (EGT), N1, N2, fuel flow (WF) and engine pressure ratio (EPR) are main gas path parameters.

Fault diagnosis based on grey relational analysis and synergetic pattern recognition for aero-engine gas-path systems

2019 ◽  
Vol 233 (12) ◽  
pp. 4598-4605
Author(s):  
Bangcheng Zhang ◽  
Jing Chen ◽  
Xiaojing Yin ◽  
Zhi Gao
Keyword(s):  
Pattern Recognition ◽  
Fault Diagnosis ◽  
Grey Relational Analysis ◽  
Relational Analysis ◽  
Aero Engine ◽  
Diagnosis Method ◽  
Path System ◽  
Aero Engines ◽  
The Many ◽  
Grey Relational

The gas-path system is an important sub-system in aero-engines. There are various indistinguishable faults in aero-engine gas-path systems. These faults are easily misjudged because the characteristic parameters are similar. Due to the many kinds of faults, current studies have poor accuracy in distinguishing similar faults. To improve fault diagnosis accuracy for gas-path systems, a fault diagnosis method based on grey relational analysis and synergetic pattern recognition is proposed. In the proposed method, grey relational analysis is used to initially distinguish the faults into different types and obtain similar fault types. Synergetic pattern recognition contributes to accurately diagnose faults which are difficult to recognize. A case study is used to verify the effectiveness and accuracy of the proposed model. The results show that faults in common types of gas-path systems can be diagnosed accurately by the proposed method.

Recent Repair Technology for Aero-Engine Blades

2015 ◽  
Vol 9 (2) ◽  
pp. 132-141 ◽  
Author(s):  
Wang Tao ◽  
Ding Huapeng ◽  
Tang Jie ◽  
Wang Hao
Keyword(s):  
Repair Technology ◽  
Aero Engine

Мобильные навигационные комплексы на отечественных суперярких светодиодах для освоения Арктики

2020 ◽  
Vol 14 (4) ◽  
pp. 338-343
Author(s):  
Д.В. Васильев ◽  
А.И. Лаврюшин
Keyword(s):  
Long Range ◽  
Optical Axis ◽  
Navigation Systems ◽  
Glide Path ◽  
Mobile Navigation ◽  
Path System

Рассмотрен потенциал возможностей светотехнических мобильных навигационных комплексов, обеспечивающих дальний привод летательных аппаратов по глиссаде. Основа комплекса – ​суперяркие монохромные светодиоды производства компании ООО «НПЦ ОЭП «ОПТЭЛ». Для сравнения характеристик светодиодов для задач навигации выбран новый параметр – ​распределение освещенности в плоскости, перпендикулярной оптической оси светодиода. Параметр влияет на массо-­габаритные и тактико-­технические характеристики проектируемых изделий. The article discusses the possibility of creating lighting mobile navigation systems that provide long-range drive of aircraft along the glide path. System base – ​monochrome LEDs of LLC SPCOD “OPTEL”. A new parameter was proposed for navigation issues – ​the distribution of illumination in a plane perpendicular to the optical axis of the LED. The parameter affects the overall dimensions and tactical and technical characteristics of the designed products.

Further Computational Investigations Into Aero-Engine Bearing Chamber Off-Take Flows

2010 ◽  
Author(s):  
Adam Robinson ◽  
Carol Eastwick ◽  
Herve´ Morvan
Keyword(s):  
Experimental Work ◽  
Symmetry Plane ◽  
Two Phase ◽  
Pipe System ◽  
Aero Engine ◽  
Gravity Driven ◽  
Computational Fluid Dynamics Cfd ◽  
Modelling Assumptions ◽  
Static Head ◽  
Engine Bearing

Within an aero-engine bearing chamber oil is provided to components to lubricate and cool. This oil must be efficiently removed (scavenged) from the chamber to ensure it does not overheat and degrade. Bearing chambers typically contain a sump section with an exit pipe leading to a scavenge pump. In this paper a simplified geometry of a sump section, here simply made of a radial off-take port on a walled inclined plane, is analysed computationally. This paper follows on work presented within GT2008-50634. In the previous paper it was shown that simple gravity draining from a static head of liquid cold be modelled accurately, for what was akin to a deep sump situation fond in integrated gear boxes for example. The work within this paper will show that the draining of flow perpendicular to a moving film can be modelled. This situation is similar to the arrangements found in transmission bearing chambers. The case modelled is of a walled gravity driven film running down a plane with a circular off-take port, this replicates experimental work similar to that reported in GT2008-50632. The commercial computational fluid dynamics (CFD) code, Fluent 6 [1] has been employed for modelling, sing the Volume of Fluid (VOF) approach of Hirt and Nichols [2, 3] to capture the physics of both the film motion and the two phase flow in the scavenge pipe system. Surface tension [4] and a sharpening algorithm [5] are used to complement the representation of the free surface and associated effects. This initial CFD investigation is supported and validated with experimental work, which is only depicted briefly here as it is mainly sued to support the CFD methodology. The case has been modelled in full as well as with the use of a symmetry plane running down the centre of the plane parallel to the channel walls. This paper includes details of the meshing methodology, the boundary conditions sued, which will be shown to be of critical importance to accurate modelling, and the modelling assumptions. Finally, insight into the flow patterns observed for the cases modelled are summarised. The paper further reinforces that CFD is a promising approach to analysing bearing chamber scavenge flows although it can still be relatively costly.

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