Chemical Speciation of Hydrocarbon Emissions from a Commercial Aircraft Engine

2007 ◽  
Vol 23 (5) ◽  
pp. 912-918 ◽  
Author(s):  
Paul E. Yelvington ◽  
Scott C. Herndon ◽  
Joda C. Wormhoudt ◽  
John T. Jayne ◽  
Richard C. Miake-Lye ◽  
...  
Keyword(s):  
Chemical Speciation ◽  
Aircraft Engine ◽  
Hydrocarbon Emissions ◽  
Commercial Aircraft

A Generalised Likelihood Ratio Test for Adaptive Gas Turbine Health Monitoring

2008 ◽  
Author(s):  
S. Borguet ◽  
O. Le´onard
Keyword(s):  
Kalman Filter ◽  
Likelihood Ratio ◽  
Likelihood Ratio Test ◽  
Health Monitoring ◽  
Aircraft Engine ◽  
Ratio Test ◽  
Secondary System ◽  
Commercial Aircraft ◽  
Turbine Engine ◽  
Auxiliary Component

Kalman filters are widely used in the turbine engine community for health monitoring purpose. This algorithm has proven its capability to track gradual deterioration with a good accuracy. On the other hand, its response to rapid deterioration is either a long delay in recognising the fault, and/or a spread of the estimated fault on several components. The main reason of this deficiency lies in the transition model of the parameters that is blended in the Kalman filter and assumes a smooth evolution of the engine condition. This contribution reports the development of an adaptive diagnosis tool that combines a Kalman filter and a secondary system that monitors the residuals. This auxiliary component implements a Generalised Likelihood Ratio Test in order to detect and estimate an abrupt fault. The enhancement in terms of accuracy and reactivity brought by this adaptive Kalman filter is highlighted for a variety of simulated fault cases that may be encountered on a commercial aircraft engine.

The Science, Technology, and Implementation of TiAl Alloys in Commercial Aircraft Engines

2013 ◽  
Vol 1516 ◽  
pp. 49-58 ◽  
Author(s):  
B. P. Bewlay ◽  
M. Weimer ◽  
T. Kelly ◽  
A. Suzuki ◽  
P.R. Subramanian
Keyword(s):  
Titanium Aluminide ◽  
Turbine Blades ◽  
Aircraft Engine ◽  
Low Pressure ◽  
Major Advance ◽  
Commercial Aircraft ◽  
Tial Alloys ◽  
Low Pressure Turbine ◽  
Titanium Aluminide Alloy ◽  
History Of

ABSTRACTThe present article will describe the science and technology of titanium aluminide (TiAl) alloys and the engineering development of TiAl for commercial aircraft engine applications. The GEnxTM engine is the first commercial aircraft engine that is flying titanium aluminide (alloy 4822) blades and it represents a major advance in propulsion efficiency, realizing a 20% reduction in fuel consumption, a 50% reduction in noise, and an 80% reduction in NOx emissions compared with prior engines in its class. The GEnxTM uses the latest materials and design processes to reduce weight, improve performance, and reduce maintenance costs.GE’s TiAl low-pressure turbine blade production status will be discussed along with the history of implementation. In 2006, GE began to explore near net shape casting as an alternative to the initial overstock conventional gravity casting plus machining approach. To date, more than 40,000 TiAl low-pressure turbine blades have been manufactured for the GEnxTM 1B (Boeing 787) and the GEnxTM 2B (Boeing 747-8) applications. The implementation of TiAl in other GE and non-GE engines will also be discussed.

The MERMOSE project: Characterization of particulate matter emissions of a commercial aircraft engine

2017 ◽  
Vol 105 ◽  
pp. 48-63 ◽  
Author(s):  
David Delhaye ◽  
François-Xavier Ouf ◽  
Daniel Ferry ◽  
Ismael K. Ortega ◽  
Olivier Penanhoat ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Aircraft Engine ◽  
Commercial Aircraft ◽  
Particulate Matter Emissions

Commercial Aircraft Engine Emissions Characterization of in-Use Aircraft at Hartsfield-Jackson Atlanta International Airport

2008 ◽  
Vol 42 (6) ◽  
pp. 1877-1883 ◽  
Author(s):  
Scott C. Herndon ◽  
John T. Jayne ◽  
Prem Lobo ◽  
Timothy B. Onasch ◽  
Gregg Fleming ◽  
...  
Keyword(s):  
Aircraft Engine ◽  
Commercial Aircraft ◽  
Engine Emissions ◽  
International Airport

A Network Approach to Define Modularity of Product Components

2005 ◽  
Author(s):  
Manuel E. Sosa ◽  
Anupam Agrawal ◽  
Steven D. Eppinger ◽  
Craig M. Rowles
Keyword(s):  
Graph Theory ◽  
Social Network ◽  
Network Analysis ◽  
Aircraft Engine ◽  
Product Architecture ◽  
Network Approach ◽  
Commercial Aircraft ◽  
Complex Products ◽  
Design Interfaces ◽  
Future Work

We consider complex products as a network of components that share technical interfaces in order to function as a whole. Building upon previous work in graph theory and social network analysis, we define three measures of component modularity that consider how components may share direct interfaces with other adjacent components, how design interfaces may propagate to all other components in the product, and how components may act as “bridges” between other components. We calculate and interpret all three measures of component modularity by studying the actual product architecture of a large commercial aircraft engine. We illustrate how to use these measures to test their impact on component redesign. Directions for future work are discussed.

scholarly journals CFD Approach to the Research and Design of Low Emission Commercial Aircraft Engine Combustor

2011 ◽  
Vol 17 ◽  
pp. 616-617
Author(s):  
Zhang Man ◽  
Fu Zhenbo ◽  
Li Jibao ◽  
Lin Yuzhen
Keyword(s):  
Aircraft Engine ◽  
Commercial Aircraft ◽  
Low Emission ◽  
Research And Design

Repeatability of a Topology Optimized Tapered Box Beam Additively Manufactured With Electron Beam Melted Ti-6Al-4V

2020 ◽  
Author(s):  
Eric Bol ◽  
M. Ramulu
Keyword(s):  
Electron Beam ◽  
Topology Optimization ◽  
Additive Manufacturing ◽  
Aircraft Engine ◽  
Maximum Principal Stress ◽  
Strength Testing ◽  
Commercial Aircraft ◽  
Box Beam ◽  
Maximum Stiffness ◽  
Final Design

Abstract In order for metal additive manufacturing to fully break into the commercial aircraft industry the process has to be stable and repeatable. The product safety of high-quality serial production components is directly related to manufacturing repeatability. In this study a tapered box beam resembling a scaled down commercial aircraft engine pylon forward strut box is designed for additive manufacturing using 3D topology optimization as a guide. The topology optimization algorithm initially sized the structure for maximum stiffness, then the resulting CAD model was redesigned and analyzed for maximum principal stress to reduce the weight. The final design had an asymmetric organic-like truss structure that was manufactured in two halves out of titanium using an Arcam A2X electron beam powder bed fusion machine. A trial build helped to determine the proper support strategy to achieve quality specimens with tight tolerances that would facilitate assembly. To test the manufacturing repeatability a series of three builds was executed to produce six beam specimens for follow-on analysis and strength testing. This paper describes the design, analysis, and manufacturing process for a topology optimized taped box beam that is intended for future ultimate strength testing and analysis.

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