The Individual Aircraft Tracking Program (IATP) for the FAA Flight Inspection Aircraft Fleet - An Examination of the Translation of Measured Flight Parameters to Potential Crack Growth at Critical Areas to the Projection of Inspection/Maintenance Scheduling

1997 ◽  
Author(s):  
James M. Marks
Keyword(s):  
Crack Growth ◽  
Maintenance Scheduling ◽  
Critical Areas ◽  
Aircraft Tracking ◽  
Flight Parameters ◽  
The Individual

scholarly journals Introduction of an Individual Aircraft Tracking Program for the Polish SU-22

2017 ◽  
Vol 2017 (9) ◽  
pp. 101-108
Author(s):  
Piotr Reymer ◽  
Marcin Kurdelski ◽  
Andrzej Leski ◽  
Andrzej Leśniczak ◽  
Michał Dziendzikowski
Keyword(s):  
Service Life ◽  
Air Force ◽  
Monitoring Program ◽  
Load Profile ◽  
Operational Load ◽  
Aircraft Tracking ◽  
Load Monitoring ◽  
Flight Parameters ◽  
The Individual ◽  
National Defence

AbstractThe Su-22 fighter-bomber is a military aircraft used in the Polish Air Force (PLAF) since the mid 1980’s. By decision of the Ministry of National Defence Republic of Poland, the assumed service life for this type of aircraft was prolonged up to 3200 flight hours based on the Full Scale Fatigue Test (FSFT) results. The FSFT was conducted using the real load profile defined during the Operational Load Monitoring Program (OLM) and the 3200 hour service life was also based on this load profile.In order to assure safe operation of all the 18 Su-22 aircraft, the Individual Aircraft Tracking program was introduced. The program was based on the results of the FSFT as well as the analysis of the flight parameters recorded by the THETYS onboard flight recorder.In this paper, the authors present the methodology, assumed fatigue hypothesis and preliminary results of the IAT program for the Polish Su-22.

scholarly journals Measuring the Impact of Knowledge Management on the Effectiveness in the Classroom Delivery using Multiple Regression

2019 ◽  
Vol 8 (2S11) ◽  
pp. 3966-3969
Keyword(s):  
Knowledge Management ◽  
Critical Factor ◽  
Integrated Approach ◽  
Knowledge Generation ◽  
Educational Institutions ◽  
Critical Fields ◽  
Knowledge Application ◽  
Critical Areas ◽  
The Individual ◽  
The Impact

Knowledge management is considered as the integrated approach which involves in identifying, managing and sharing the critical know-how, enable in enhancing the experiences of the individual and increasing the intellectual capital of the human resources in the education sector. Knowledge management is considered as the critical fields which enable in guiding the educational institutions and the students in generating new knowledge, storing them and apply when required. Hence, to apprehend the effect of knowledge management, a clear picture of the approach and framework needs to be determined. Knowledge management possess greater impact on the effectiveness in the classroom delivery, the knowledge generation is considered as the critical factor in the KM model which was stated earlier. Hence, educational institutions tend to focus on the three specified critical areas: Knowledge generation; Knowledge storage and Knowledge application. These aspects will enable the trainers to enhance the effectiveness of classroom delivery in educational institutions

Maintenance Scheduling Based on Accumulated Crack Growth

2009 ◽  
pp. 172-172-16
Author(s):  
AP Berens ◽  
JP Gallagher
Keyword(s):  
Crack Growth ◽  
Maintenance Scheduling

scholarly journals Flight and Molecular Modeling Study on the Response of Codling Moth, Cydia pomonella (Lepidoptera: Tortricidae) to (E,E)-8,10-Dodecadien-1-ol and Its Geometrical Isomers

2000 ◽  
Vol 55 (11-12) ◽  
pp. 1011-1017 ◽  
Author(s):  
Ashraf El-Sayed ◽  
Ilme Liblikas ◽  
Rikard Unelius
Keyword(s):  
Molecular Modeling ◽  
Cydia Pomonella ◽  
Codling Moth ◽  
Flight Behavior ◽  
Behavioral Activity ◽  
Geometrical Isomers ◽  
Specific Receptors ◽  
Flight Parameters ◽  
The Individual ◽  
Number Of Males

In a previous study we have reported that both (E,Z )-8,10-dodecadienol (E,Z ) and (Z,Z )- 8,10-dodecadienol (Z,Z ) isomers inhibit the attraction of male codling moth, Cydia pomonella L. when added to (E,E)-8,10-dodecadienol (E,E ) while the (E,E)-8,10-dodecadienol (Z,E ) isomer induces slight increase in the number of males attracted to the pheromone source. In the p resent study, we have tested the behavioral activity of the individual geometrical isomers E,Z; Z,E and Z,Z . A few number of codling moth males flew to the Z,E -isomer while the other two isomers (i.e. E,Z and Z,Z ) did not elicit any upwind orientation. Analysis of the flight behavior to the E,E- and Z,E-isomer showed significant differences in most of the flight parameters evaluated. Based on the biological observations and molecular modeling, we suggest that the behavioral activity of the Z,E-isomer is due to presence of specific receptors for this isomer on male antennae and not to its structural resemblance to the E,E-isomer. These results underline the importance of the Z,E-isomer in sex attraction of male codling moth.

Failure Analysis and Life Assessment of Thermal Fatigue Crack Growth in a Nickel-Base Superalloy Based on EBSD Method

2015 ◽  
Author(s):  
Daisuke Kobayashi ◽  
Masamichi Miyabe ◽  
Masahiro Achiwa
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Fatigue Crack Growth Rate ◽  
Fracture Mode ◽  
Fracture Morphology ◽  
Life Assessment ◽  
The Individual

In the case of failure incidents involving important components, it is necessary to clarify the fracture mechanism by failure analysis. In the case of conventional steel materials, according to the individual fracture mode the fracture surfaces have unique fracture morphology corresponding to tensile, impact, creep and fatigue conditions. We can identify the mechanism of a fracture by observing its fracture surface, and this is known as the fractography. However regarding nickel-base superalloys, any differences in fracture morphology are unfortunately barely distinguishable, which makes it difficult to conduct fractography. In this paper, in order to characterize the damage behavior of IN738LC, the misorientation analysis within grains by using the electron backscattered diffraction (EBSD) method across almost all the whole range of specimens has been carried out. As a result, it was found that the cross section of fracture samples have unique distinguishable morphology corresponding to the individual fracture mode. Furthermore, the striations corresponding to the fatigue crack growth rate was found in the crack cross-sectional sample. It was considered that the EBSD striation observed on the cross section reveals the fatigue crack growth rate, as with striations found in the fatigue fracture surface such as conventional steel materials. On the case study of the actual (service and damaged) gas turbine blade, the EBSD analysis as the fractography revealed the mechanism of cracking and the fatigue crack growth rate. Thus, it is concluded that the misorientation analysis of damage materials allows the qualitative estimation of the fracture mode and the quantitative life assessment of the fatigue crack growth.

Crack Growth Behavior of Nickel Alloy Welds in a PWR Environment

2007 ◽  
Author(s):  
B. Alexandreanu ◽  
O. K. Chopra ◽  
W. J. Shack
Keyword(s):  
Crack Growth ◽  
National Laboratory ◽  
Argonne National Laboratory ◽  
Crack Growth Behavior ◽  
Pressurized Water Reactor ◽  
Pressurized Water ◽  
Cracking Behavior ◽  
Water Reactor ◽  
Ni Alloy ◽  
The Individual

A program is under way at Argonne National Laboratory to evaluate the resistance of Ni alloys and their welds to environmentally assisted cracking in simulated Light Water Reactor (LWR) coolant environments. This paper focuses on the cracking behavior of Ni-alloy welds in simulated pressurized water reactor (PWR) environment at 290–350°C. Crack growth tests have been conducted on both field- and laboratory-produced welds. The results are compared with the existing crack-growth-rate (CGR) data for Ni-alloy welds to determine the relative susceptibility of specific Ni-alloy welds to environmentally enhanced cracking. To analyze the CGRs, a superposition model was used to establish the individual contributions of mechanical fatigue, corrosion fatigue, and stress corrosion cracking.

scholarly journals Crack Assessment of Wheel Hubs via an Ultrasonic Transducer and Industrial Robot

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4336 ◽  
Author(s):  
Hanming Zhang ◽  
Chunguang Xu ◽  
Dingguo Xiao
Keyword(s):  
Crack Growth ◽  
Ultrasonic Testing ◽  
Degrees Of Freedom ◽  
Industrial Robot ◽  
Ultrasonic Transducer ◽  
Robot Assisted ◽  
Six Degrees Of Freedom ◽  
Crack Location ◽  
Critical Areas ◽  
Growth Assessment

Crack assessment when making fitness-for-service decisions requires a thorough examination of crack location and size in critical areas. An ultrasonic transducer is used for such assessments, but traditional methods cannot cope with complex rotators, such as wheel hubs. We present a model of robot-assisted crack growth assessment in wheel hubs. We integrate a six-degrees-of-freedom (DOF) industrial robot and a turntable to form a robot-assisted ultrasonic testing (UT) system that does not use traditional UT equipment. Ultrasonic beams are focused at certain depths appropriate for achieving maximum sensitivity. We quantitatively analysed wheel hubs with longitudinal and transverse series of pre-cracks, and concluded that our system autonomously detected cracks.

Fractographic Study on the Use of Rainflow Counting for Small and Long Cracks in AA7050

2014 ◽  
Vol 891-892 ◽  
pp. 687-692 ◽  
Author(s):  
Paul White ◽  
David S. Mongru
Keyword(s):  
Crack Growth ◽  
Fatigue Loading ◽  
Variable Amplitude Loading ◽  
Variable Amplitude ◽  
Counting Technique ◽  
Rainflow Cycle Counting ◽  
Small Cracks ◽  
The Individual ◽  
Rainflow Counting ◽  
Variable Amplitude Fatigue

Using ada/dNequation to predict fatigue crack growth for a variable amplitude loading sequence, requires converting the sequence into an equivalent series of constant amplitude cycles, which is sometimes achieved using the rainflow cycle counting technique. Rainflow counting views small intermediate cycles as an interruption to a larger cycle, in effect, the crack tip remembers the state of the larger cycle. This has been shown to be an effective technique in predicting fatigue growth rates for long cracks, but has not been extensively investigated for use in predicting the growth of small cracks. An investigation was made into the applicability of rainflow cycle counting for predicting the crack growth of small and long cracks created with variable amplitude fatigue loading in AA7050-T7451 plate, a common modern aircraft material. A series of coupons were tested with a number of different variable amplitude loading sequences which had distinct marker bands inserted to separate the individual segments of loading and enable them to be identified fractographically. For the sequences examined, which covered varying numbers of interrupted cycles and a staircase of three steps, the baseline and the rainflow loading segments within each sequence showed effectively the same rate of growth for the same stress intensity range in both the small and long crack coupons, demonstrating that rainflow cycle counting was a suitable cycle counting technique for both small and long cracks.

Bayesian sensitivity analysis of flight parameters that affect main landing gear yield locations

2014 ◽  
Vol 118 (1210) ◽  
pp. 1481-1497 ◽  
Author(s):  
P. Sartor ◽  
K. Worden ◽  
R. K. Schmidt ◽  
D. A. Bond
Keyword(s):  
Sensitivity Analysis ◽  
Pitch Angle ◽  
Shock Absorber ◽  
Bending Moment ◽  
Landing Gear ◽  
Tube Bending ◽  
Vertical Descent ◽  
Margin Of Safety ◽  
Flight Parameters ◽  
The Individual

Abstract An aircraft and landing gear loads model was developed to assess the Margin of Safety (MS) in main landing gear components such as the main fitting, sliding tube and shock absorber upper diaphragm tube. Using a technique of Bayesian sensitivity analysis, a number of flight parameters were varied in the aircraft and landing gear loads model to gain an understanding of the sensitivity of the MS of the main landing gear components to the individual flight parameters in symmetric two-point landings. The significant flight parameters to the main fitting MS, sliding tube bending moment MS and shock absorber upper diaphragm tube MS include: longitudinal tyre-runway friction coefficient, aircraft vertical descent velocity, aircraft Euler pitch angle and aircraft mass. It was also shown that shock absorber servicing state and tyre pressure do not contribute significantly to the MS.

Impact of loads recording methodology on crack-growth-based individual aircraft tracking

1985 ◽  
Vol 22 (12) ◽  
pp. 1101-1102
Author(s):  
Robert M. Engle ◽  
Thomas F. Christian
Keyword(s):  
Crack Growth ◽  
Aircraft Tracking
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