Durability and Damage Tolerance Assessment of the TF34-100 Engine

1986 ◽  
Author(s):  
Jon S. Ogg ◽  
Ronald R. Reinhold
Keyword(s):  
Air Force ◽  
Damage Tolerance ◽  
Flight Safety ◽  
Weapon System ◽  
General Electric ◽  
Structural Assessment ◽  
Structural Durability ◽  
Inspection Systems ◽  
Useful Life ◽  
Maintenance Plan

The critical nature of the TF34-100 engine to the Air Force’s A-10 Close Air Support weapon system made it important to obtain the best possible visibility of the engine’s future structural maintenance needs and component life limits. Accordingly, an in-depth structural durability and damage tolerance assessment was performed on this engine by a joint Air Force/General Electric team. Results of the assessment team’s unprecedented analysis efforts culminated in a comprehensive Structural Maintenance Plan that identified both current and future maintenance actions necessary for insuring maximum flight safety. The plan entailed component inspection and replacement intervals, inspection systems, preferred modifications/reworks, and a life growth plan for extending the useful life of the TF34-100 upwards to 8000 A-10 mission hours. This paper details the nature and extent of effort undertaken in conducting the 18 month structural assessment.

Companion Trainer Aircraft: Concept Definition and Evaluation

1982 ◽  
Vol 26 (7) ◽  
pp. 610-614
Author(s):  
Robert T. Nullmeyer
Keyword(s):  
Air Force ◽  
Transfer Of Training ◽  
Low Cost ◽  
Flight Training ◽  
Weapon System ◽  
Electronic Warfare ◽  
Concept Definition ◽  
Business Jet ◽  
Air Force Base ◽  
B 52

Faced with increasing budget constraints and a need to conserve the B-52 weapon system, the Strategic Air Command has pursued several avenues to make continuation training programs more efficient. Because actual flight training is considered to be critical, one proposed solution involved the use of a low cost business jet to supplement reduced B-52 flying schedules. This jet would be augmented to provide training for the radar navigator, navigator, and electronic warfare officer in addition to the pilot and copilot. Some training missions would be flown in this Companion Trainer Aircraft (CTA) to reduce the need to fly the B-52. This paper describes two efforts concerning training effectiveness of a possible CTA. First, a theoretical approach based on transfer of training considerations was used to predict the training potential of the CTA. Second, because the transfer expectations for the pilot and copilot were particularly difficult to specify, a study was designed involving operational SAC crews. This study employed a modified T-39B to supplement B-52 training for eight aircrews from the 2nd Bombardment Wing, Barksdale Air Force Base, LA. Although the CTA program was cancelled and the test was terminated early, crew responses to the program and problems encountered provide valuable lessons for any future CTA program.

scholarly journals Estimating the system efficiency to ensure aircraft flight safety

2015 ◽  
Vol 36 (1) ◽  
pp. 115-122
Author(s):  
Mariusz Zieja ◽  
Henryk Smoliński ◽  
Paweł Gołda
Keyword(s):  
Air Force ◽  
Analytical Method ◽  
Quantitative Estimation ◽  
Emergency Situation ◽  
Flight Safety ◽  
System Efficiency ◽  
Safety Assurance ◽  
Aircraft Flight ◽  
Assurance System ◽  
Random Nature

Abstract In the article was presented approach logical - probabilistic to assess the efficiency of the flight safety assurance system of aircraft considering that it is justified by the random nature of the process, which describe the indicators and logic is necessary during qualifying the threats and prevent such threats. Was proposed a method of quantitative estimation of system efficiency based on data and information collected in the information systems exploited in the Air Force. Was presented an analytical method for determining the probability of counteracting by the pilot emergency situation in-flight in cases where we have relevant data on the risks of flight safety. The probability of counteracting by the pilot emergency situation in-flight is even greater the higher the expected value and the lower the variance.

scholarly journals Damage Tolerance in Biomedical Implants: Cardiac Valves and Endovascular Stents

2000 ◽  
Author(s):  
R. O. Ritchie
Keyword(s):  
Life Prediction ◽  
Heart Valves ◽  
Damage Tolerance ◽  
Heat Rate ◽  
Pyrolytic Carbon ◽  
Endovascular Stents ◽  
Prosthetic Implants ◽  
Useful Life ◽  
Valve Prostheses ◽  
Damage Tolerant

Abstract The human heat rate is roughly 40 million beats per year. To prosthetic implants such as mechanical heart valves and endovascular stents, this means that they must endure almost 109 fatigue cycles during the patient’s lifetime. To prevent premature mechanical failures of such devices, which inevitably lead to patient fatalities, considerations of damage-tolerant design and life-prediction methodologies represent a preferred approach. In this presentation, a damage-tolerant approach to life prediction and “quality control” for both metallic and ceramic heart valve prostheses is presented, based on the notion that the useful life of the device is governed by the time for incipient defects in the material to propagate, by stress corrosion or more critically fatigue, to failure. Based on these analyses, the relative benefits of metallic (Co-Cr, Ti-6Al-4V) vs. ceramic (pyrolytic carbon) valves are discussed. Finally, analogous considerations are presented for endovascular stents, particularly those processed by laser cutting of the superelastic Ni-Ti alloy Nitinol. Again, the relative benefits of Nitinol vs. more traditional metallic implant materials (stainless steel, Co-Cr, titanium, titanium alloys) are discussed.

User Innovation and System Management

2020 ◽  
pp. 109-135
Author(s):  
Jon R. Lindsay
Keyword(s):  
Air Force ◽  
Relevant Information ◽  
Digital Data ◽  
Software Systems ◽  
Weapon System ◽  
Defense Contractors ◽  
Air Defense ◽  
Weapon Systems ◽  
Data Files ◽  
Operations Center

This chapter investigates the Combined Air Operations Center (CAOC), the analogue to the Fighter Command Ops Room in the modern U.S. Air Force. The air force formally designates the CAOC as a weapon system, even as it is basically just a large office space with hundreds of computer workstations, conference rooms, and display screens. The CAOC is an informational weapon system that coordinates all of the other weapon systems that actually conduct air defense, strategic attack, close air support, air mobility and logistics, and intelligence, surveillance, and reconnaissance (ISR). One might be tempted to describe the CAOC as “a center of calculation,” but modern digital technology tends to decenter information practice. Representations of all the relevant entities and events in a modern air campaign reside in digital data files rather than a central plotting table. The relevant information is fragmented across collection platforms, classified networks, and software systems that are managed by different services and agencies. Thus, in each of the four major U.S. air campaigns from 1991 to 2003, CAOC personnel struggled with information friction. They rarely used the mission planning systems that were produced by defense contractors as planned, and they improvised to address emerging warfighting requirements.

EAGLE/DTA: A Life Cycle Cost Model for Damage Tolerance Assessment

1983 ◽  
Author(s):  
Edward J. Reed
Keyword(s):  
Life Cycle ◽  
Air Force ◽  
Life Cycle Cost ◽  
Technology Development ◽  
Damage Tolerance ◽  
Low Cycle Fatigue ◽  
Cost Model ◽  
Modeling And Analysis ◽  
Weapon Systems ◽  
Maintenance Requirements

The U.S. Air Force and Pratt & Whitney Aircraft are currently engaged in developing technology to minimize low-cycle fatigue maintenance requirements in future gas turbine engines. The Life Cycle Cost/Damage Tolerance Assessment (LCC/DTA) program is directed toward furthering technology development in two important areas that relate to the overall life cycle cost of advanced Air Force weapon systems: life cycle cost modeling and analysis, and damage tolerance design (DTD). A major goal of the LCC/DTA program is to establish hot-section disk design criteria specifying acceptable levels for life and maintenance actions based on minimum life cycle cost. This paper discusses the methodology developed to evaluate the weapon system LCC impact of designing to damage tolerance criteria.

Laser Shock Processing: Applications and Future Trends in U.S. Air Force Service

2005 ◽  
Author(s):  
M. J. Shepard
Keyword(s):  
Air Force ◽  
Damage Tolerance ◽  
The United States ◽  
Foreign Object ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
Current Application ◽  
Foreign Object Damage ◽  
Us Air Force ◽  
Shock Processing

To date, the United States Air Force is the largest end-user of laser shock processing services. Laser shock processing (LSP) is in successful day-to-day service and production for several USAF engine lines for increased foreign object damage tolerance. In this application LSP has yielded substantial increases in foreign object damage tolerance along with associated increases in safety. The history and current application of laser shock processing for US Air Force applications will be reviewed. Current and future USAF applications of laser shock processing and other surface treatments will be reviewed.

Data analysis of information system TURAWA in the aspect of data mining methods

2018 ◽  
Vol 0 (7/2018) ◽  
pp. 45-52
Author(s):  
Bolesław Szafrański ◽  
Mirosław Zieja ◽  
Jarosław Wójcik ◽  
Krzysztof Murawski
Keyword(s):  
Data Mining ◽  
Information System ◽  
Data Analysis ◽  
Computer System ◽  
Air Force ◽  
Armed Forces ◽  
Flight Safety ◽  
Operation Process ◽  
Mining Methods ◽  
Extract Information

The article is devoted to the analysis of data coming from the operation process and collected in computer system TURAWA, which focuses on supporting the management of flight safety in the Polish Air Force. The Armed Forces are equipped with a system, which collects and processes data concerning the whole air crew, all performed flights and all aircraft. The increasing opportunities in obtaining data and the continuous development of data mining methods allow to extract information never been known before, which, together with conclusions obtained from the data analysis, will help to improve the level of flight safety.

Aircraft Engine Integration for the M88-RAFALE Couple

1992 ◽  
Author(s):  
Philippe Ramette ◽  
Jean Christophe Corde
Keyword(s):  
Air Force ◽  
Mechanical Behaviour ◽  
Aircraft Engine ◽  
Short Description ◽  
Weapon System ◽  
High Complexity ◽  
Key Factor ◽  
Air Intake

As all other comparable programs, the couple RAFALE-M88 has to be a fully optimized multirole weapon system with the highest level of integration; a key factor for that purpose is the very good prebuilt integration of the engine within the aircraft. After a short description of the main historical milestones of the aircraft and engine programs development and integration, the paper will first summarize the rigourous procedures which are used by aircraft and engine manufacturers, official services and future Air Force and Navy users. Then, the paper will detail the main points where aircraft engine integration as to be lead precisely and carefully; these points are: -at first, the electronical links which are establised between the aircraft and the engine, due to the high complexity of flight softwares who have to work and talk with each others; -secondly, the aerodynamical subjects, including air intake and exhaust nozzle installation; -thirdly, the mechanical integration (geometry, mechanical behaviour, …); -then all kinds of fluid circuits or equiments.

Durability and damage tolerance control plans for U.S. Air Force aircraft

1983 ◽  
Vol 20 (8) ◽  
pp. 689-695 ◽  
Author(s):  
Michael A. Landy ◽  
O. Lester Smithers
Keyword(s):  
Air Force ◽  
Damage Tolerance ◽  
Tolerance Control
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