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 The Definition of the Load Spectrum for SU-22 Fighter-Bomber Full Scale Fatigue Test

2015 ◽  
Vol 2015 (7) ◽  
pp. 28-33
Author(s):  
Piotr Reymer ◽  
Marcin Kurdelski ◽  
Andrzej Leski ◽  
Krzysztof Jankowski
Keyword(s):  
Service Life ◽  
Fatigue Test ◽  
Air Force ◽  
Monitoring Program ◽  
Full Scale ◽  
Load Spectrum ◽  
Load Spectra ◽  
Load Monitoring ◽  
Wing Sweep ◽  
Definition Of

Abstract The Su-22 fighter-bomber is a military aircraft used in the Polish Air Force since the mid 1980’s. By the decision of the Polish Ministry of Defense the predicted service life for this type of aircraft will be extended to 3200 flight hours. Due to the fact that some aircraft were nearing the end of the service life guaranteed by the manufacturer, the actual service life, determined based on the flight profile in the Polish Air Force, had to be validated. Consequently, the Full Scale Fatigue Test (FSFT) had to be carried out in order to verify that the required service life was attainable. This article describes the process of preparation of the load spectra used in the Su-22 FSFT. Due to the fact that the Su-22 has a variable sweep wing the whole test was divided into three Stages (landing, flight and flap loads) carried out at different wing sweep angles (30°/45°/30°). The spectra were developed using the historical data gathered from Flight Data Recorders (FDR), strain signals acquired during the Operational Load Monitoring program (OLM) and aerodynamic calculations.

scholarly journals Application of Operational Load Monitoring System for Fatigue Estimation of Main Landing Gear Attachment Frame of an Aircraft

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6564
Author(s):  
Michal Dziendzikowski ◽  
Artur Kurnyta ◽  
Piotr Reymer ◽  
Marcin Kurdelski ◽  
Sylwester Klysz ◽  
...  
Keyword(s):  
Landing Gear ◽  
Fatigue Wear ◽  
Operational Load ◽  
Load Monitoring ◽  
Management Paradigms ◽  
Optimal Maintenance ◽  
Fatigue Estimation ◽  
The Individual ◽  
Vertical Landing ◽  
The Impact

In this paper, we present an approach to fatigue estimation of a Main Landing Gear (MLG) attachment frame due to vertical landing forces based on Operational Loads Monitoring (OLM) system records. In particular, the impact of different phases of landing and on ground operations and fatigue wear of the MLG frame is analyzed. The main functionality of the developed OLM system is the individual assessment of fatigue of the main landing gear node structure for Su-22UM3K aircraft due to standard and Touch-And-Go (T&G) landings. Furthermore, the system allows for assessment of stress cumulation in the main landing gear node structure during touchdown and allows for detection of hard landings. Determination of selected stages of flight, classification of different types of load cycles of the structure recorded by strain gauge sensors during standard full stop landings and taxiing are also implemented in the developed system. Based on those capabilities, it is possible to monitor and compare equivalents of landing fatigue wear between airplanes and landing fatigue wear across all flights of a given airplane, which can be incorporated into fleet management paradigms for the purpose of optimal maintenance of aircraft. In this article, a detailed description of the system and algorithms used for landing gear node fatigue assessment is provided, and the results obtained during the 3-year period of system operation for the fleet of six aircraft are delivered and discussed.

Air Force Engineering and Services Laboratory Herbicide Orange Monitoring Program

1984 ◽  
Author(s):  
R. E. Channell ◽  
T. L. Stoddart
Keyword(s):  
Air Force ◽  
Monitoring Program

Housekeeping Services: A Work-Load Monitoring Program

1968 ◽  
Vol 46 (4) ◽  
pp. 75-76
Author(s):  
Anne J. Vestal
Keyword(s):  
Monitoring Program ◽  
Work Load ◽  
Load Monitoring

Investigations on corrosion of aircrafts in the aspect of prolonged service life and operation driven by their technical condition

2012 ◽  
Vol 30 (1) ◽  
pp. 59-72 ◽  
Author(s):  
Piotr Barszcz
Keyword(s):  
Service Life ◽  
Air Force ◽  
Atmospheric Corrosion ◽  
Protective Coatings ◽  
Technical Condition ◽  
Structural Components ◽  
Institute Of Technology ◽  
Corrosion Investigation ◽  
Prolonged Service ◽  
Research Studies

Research studies that are conducted by both the Air Force Institute of Technology (AFIT) and other domestic and foreign organizations indicate that investigations of corrosion phenomena present a very important factor with respect to prolongation of technical resources and operation of aircraft driven by their actual technical condition. The investigation of the corrosion degree and deterioration of protective coatings must be carried out in a systemic manner with thorough analysis of information that bring together the aircraft operation and the processes of corrosion and deterioration of protective coatings. The investigation must comprise measurements of the atmospheric corrosion in order to determine corrosive aggressiveness of the atmosphere and establish frequency and scope of corrosion inspection. Only the analysis of gathered information with its characteristics may guarantee safe operation of structural components of aircrafts according to their actual technical condition. This paper outlines the approach to corrosion investigation that is in place in AFIT.

scholarly journals Influence of moisture infiltration on flexible pavement cracking and optimum timing for surface seals

2020 ◽  
Vol 47 (5) ◽  
pp. 487-497 ◽  
Author(s):  
Syed Waqar Haider ◽  
Muhammad Munum Masud ◽  
Karim Chatti
Keyword(s):  
Service Life ◽  
Monitoring Program ◽  
Fatigue Cracking ◽  
Flexible Pavement ◽  
Time Domain Reflectometry ◽  
Water Infiltration ◽  
Base Layer ◽  
Pavement Performance ◽  
Ann Model ◽  
Premature Failure

Moisture increase in pavement subsurface layers has a significant influence on granular material properties that affect the expected pavement performance. In situ moisture variations over time in an unbound base layer depend on water infiltration after precipitation and pavement surface conditions. Consequently, base resilient modulus (MR) is reduced, which leads to premature failure and reduced service life. This paper presents long-term pavement performance (LTPP) data analyses for quantifying the effect of moisture infiltration through surface cracking on flexible pavement performance. Subsurface moisture data obtained through the seasonal monitoring program (SMP) time domain reflectometry (TDR) are an excellent source for quantifying the moisture-related damage in flexible pavement located in different climates. An artificial neural network (ANN) model was developed based on the SMP data for flexible pavement sections. The results show that higher levels of cracking will lead to an increase in moisture levels within the base layer, which leads to a significant decrease in the base MR. For flexible pavement, the maximum reduction in base MR ranged from 18% to 41% and from 153% to 175% for the pavement sections located in dry and wet regions, respectively. Consequently, the performance of pavement sections located in wet climates is adversely affected. The findings imply that an adequate and timely preservation treatment for cracking sealing (e.g., surface seals) can enhance the pavement’s service life, especially in wet climates. The results suggest that cracks should be sealed when the extent of fatigue cracking is within 6% and 11% for the flexible pavement sections located in wet and dry climates, respectively.

The Experimental and Numerical Analysis of Stress as a Tool for Optimizing the Selected Structural Components of an Injection Device

2015 ◽  
Vol 816 ◽  
pp. 482-489
Author(s):  
Peter Sivák ◽  
Oskar Ostertag
Keyword(s):  
Numerical Analysis ◽  
Service Life ◽  
Structural Components ◽  
Injection Device ◽  
Paper Briefly ◽  
Technical Parameters ◽  
Structural Parts ◽  
The Individual ◽  
Important Basis

The improvement of the main monitored technical parameters of the production devices is connected with the optimization of the individual structural components and construction nodes of these devices. Mainly those critical structural nodes of the devices that have a significant impact on the quality of the products manufactured by this device and its service life are studied. This paper briefly presents the results of experimental and numerical analysis of stresses and strains of selected structural components of the injection device, such as the connecting and guiding columns and the adjustable push plate. The relevant analyses of stresses and strains have been connected with the performance of a series of experimental and computer simulations. The results of these simulations then became an important basis for further optimization of selected structural parts of the injection device.

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.

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