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Scanning electron microscopy observations of fatigue crack growth retardation due to block overloads
(IOP Publishing LTD, 2001)Fatigue crack propagation behaviour of 2024-T3 aluminium (Al) alloy under periodic overloads superimposed on constant amplitude loadings with R=0.5 and f=10 Hz was investigated by scanning electron microscopy (SEM). During ... -
Performance figures of merit for turbojet/fan transport aircraft performance comparison and conceptual design
(2003)A set of aircraft performance figures of merit for different phases of flight mission is derived from aircraft performance equations. In addition, an overall performance figure of merit combining the derived performance ... -
Microstructural observation of overload effect on the fatigue crack growth of 2024-T3 Al-alloy
(IOP Publishing LTD, 2004)Microstructural investigation of fracture surfaces after fatigue crack growth experiments on 2024-T3 centrally cracked specimens was carried out. Variable amplitude loadings were used with periodic overload cycles added ... -
Aero-propulsive modeling of transport aircraft for air traffic management applications
(2004)Aerodynamic and propulsive modeling of current aircraft fleet is vital for Air Traffic Management applications, especially for use in decision support tools to predict aircraft trajectories and simulation tools. There are ... -
Testing and characterization of ceramic thermal barrier coatings
(Trans Tech Publications LTD, 2005)This paper gives a short overview of tests applied for the investigation of long term behaviour of thermal barrier coating systems. A variety of tests has been conducted on an exemplary material system with the coatings ... -
Defect evolution in thermal barrier coating systems under multi-axial thermomechanical loading
(Elsevier Science Sa, 2005)In service, gas turbine components with thermal barrier coatings experience high cyclic mechanical and thermal loading. Important, but not yet considered sufficiently, are the multi-axial stresses arising from thermal ... -
The role of cyclic mechanical loading and thermal gradients in damage behavior of thermal barrier coating systems
(2005)Ceramic thermal barrier coatings (TBC) can exhibit premature in-service failure due to spallation as a consequence of exposure to elevated temperatures, aggressive environments, and cyclic thermal and mechanical loading. ... -
Parallel solution of low aspect ratio rectangular flat wings in compressible flow
(2005)Two block parallel Navier Stokes solutions of an aspect ratio 1.0 flat plate with sharp edges are obtained at different Mach numbers and angles of attack. Reynolds numbers are of the order of 200,000-300,000. The flow field ... -
Time-economic lifetime assessment for high performance thermal barrier coating systems
(Trans Tech Publications LTD, 2007)Strategies for time-economic lifetime assessment of thermal barrier coatings (TBC) in service are described and discussed on the basis of experimental results, achieved on material systems with coatings applied by electron ... -
Failure analysis of an aircraft piston engine components
(Pergamon-Elsevier Science LTD, 2009)In this study, failed parts from the piston engine of TB-20 Trinidad aircraft which declared an emergency landing to Anadolu University Airport, Eskisehir, Turkey due to the over-speed of propeller during a training flight ... -
The use of information technologies and systems in airlines
(2009)All over the world, air passengers would like to determine their destination, prefer an airline company among the many in the world, buy their tickets without any difficulty and make any changes when necessary. Then they ... -
A fault tolerant flight control system for sensor and actuator faults
(2010)The purpose of the paper is to present an approach to detect, isolate and accommodate the sensor or actuator faults using bank of unknown input observers (UIO). Full order observers, reduced order observers, unknown input ... -
ARINC 629 data bus standard on aircrafts
(2010)In earlier analogue avionic systems the number of cables used to transfer information between the various system components was considerable. With these systems, at least one pair of wires has been required for each signal ... -
Pitch rate damping of an aircraft by a fuzzy PD controller
(2010)Aircraft dynamics are in general nonlinear, time varying, and uncertain. A control system (classical control systems) designed for a flight condition, may not provide the desired stability and performance characteristics ... -
The importance of preventive maintenance in terms of reliability in aviation sector
(2011)Aircraft is a system that requires high reliability levels throughout flights. Preventive maintenance procedures are applied to maintain this reliability at an optimum level. The higher frequency of preventive maintenance ... -
Open and closed loop control of a transport aircraft after component failure
(2011)Aircraft dynamics are severely affected by the damages and failures of components. If corrective commands are not supplied immediately, force and moment imbalances lead into catastrophic consequences. In this study, flight ... -
FDI & reconfiguration on aircraft engine by hamming-NN&UIO
(2013)Fault detection, isolation and reconfiguration process has a vital importance especially in aviation sector. In this sector, health fault diagnosis can avoid systems abnormal situations and provides operational continuity ... -
Aircraft engine sensor fault detection, isolaton and reconfiguration using fuzzy logic control based unknown input observer
(Lappeenranta University of Technology, 2014)In this paper, a model-based robust fault diagnosis approach 'Unknown Input Observer (UIO)', 'Generalized Observer Scheme (GOS)' and 'a Fuzzy Logic Control Mechanism' will be studied respectively for fault detection, ... -
An integrated navigation system design for Quadrotors
(Institute of Electrical and Electronics Engineers Inc., 2015)In this work, a particle filter based integrated navigation system is designed and tested with real quadrotor systems. Conventionally, Kalman filter based algorithms is used for navigation systems which is highly non-linear. ... -
The modeling and simulation of a quadrocopter
(EUROSIS, 2016)Mini-flying vehicles with four rotors which are called quadcopters have attracted many researchers in recent years. Quadrotor is the one of the most popular rotary wing aircraft in control problems. Vertical take off and ...
