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.

scholarly journals A Comparison of Navy and Contractor Gas Turbine Acquisition Cost

1983 ◽  
Author(s):  
L. T. Finizie
Keyword(s):  
Air Force ◽  
Life Cycle Cost ◽  
Aircraft Engine ◽  
Production Costs ◽  
Advanced Technology ◽  
Weapon System ◽  
Aircraft Systems ◽  
Support Costs ◽  
Time Period ◽  
The Government

The increasing cost of weapons provided the stimulus needed for the Navy and Air Force jointly to study common engine requirements for the 1990s. Since engines require several years longer to develop than airframes, the Government sponsored the Advanced Technology Engine Study (ATES) to develop a long range propulsion plan for new aircraft needed through 2010. Because of the interaction between aircraft and engine in the design of the weapon system, aircraft engine companies teamed with aircraft companies to provide aircraft and engine conceptual designs to perform the expected missions for the 1990 time period. Life Cycle Cost (LCC) was used as the criterion in evaluating the merit of a number of USN and USAF aircraft systems. Since operating and support costs (0&S) are the most difficult of LCC to predict accurately, this paper compares only development and production costs provided by the participating contractors with those costs determined using cost criteria developed by the Navy.

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 ON EFFICIENCY OF SOME METHODS FOR DETERMINING THE AZIMUTHAL STRUCTURE OF NOISE IN CYLINDRICAL DUCT

Akustika ◽  
2019 ◽  
Vol 32 ◽  
pp. 130-134
Author(s):  
Vadim Palchikovskiy ◽  
Yuliy Bersenev ◽  
Ivan Korin
Keyword(s):  
Least Squares ◽  
Dynamic Range ◽  
Least Squares Method ◽  
Microphone Array ◽  
Aircraft Engine ◽  
Circular Array ◽  
Noise Measurements ◽  
Air Intake ◽  
Experimental Values ◽  
Cylindrical Duct

The determination of azimuthal sound modes propagating in a cylindrical duct is considered based on the results of noise measurements on experimental setup with a duct diameter of 1.8 m, which corresponds to the air intake of aircraft engine. The experiments were carried out in PNRPU anechoic chamber. Spinning modes were generated by a circular array of 40 acoustic drivers. Noise in duct was recorded with circular array of 100 microphones with optimized arrangement to reach maximum dynamic range. The following methods for determining the azimuthal structure of noise were compared: modal decomposition method, cross-correlation with a reference channel method; least-squares method. The mathematical foundations and specifics of these methods are briefly outlined. According to the results of the azimuthal structure extraction, it was found that the least-squares method provides the best agreement between the generated and extracted modes and the distribution of the computed and experimental values of acoustic pressures on microphone array.

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.

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.

scholarly journals Effect of Wetting-Drying Cycles on Mechanical Behaviour and Electrical Resistivity of Unsaturated Subgrade Soil

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Zhi Hu ◽  
Kai Peng ◽  
Lihua Li ◽  
Qiang Ma ◽  
Henglin Xiao ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Mechanical Behaviour ◽  
Resistivity Measurement ◽  
Compacted Soil ◽  
Subgrade Soil ◽  
Key Factor ◽  
Electrode Method ◽  
Unsaturated Clay ◽  
Soil Wetting ◽  
Alternative Current

Compacted soil is widely used in road and railway subgrade, while alternation of seasons can cause fluctuations in moisture content of soil (i.e., wetting-drying cycles) and influence the performance of soil. In order to research the effect of wetting-drying cycles on mechanical behaviour and electrical resistivity of compacted unsaturated subgrade soil, wetting-drying tests considering different number and cyclic amplitude were conducted on compacted unsaturated clay specimens, and the electrical resistivity and unconfined compressive strength of soil were measured in this study. The AC (alternative current) two-electrode method was applied in the resistivity measurement. The experimental results show that increasing number and cyclic amplitude of wetting-drying cycles can both reduce the strength and electrical resistivity of the compacted unsaturated specimens. After 3-4 wetting-drying cycles, the strength and electrical resistivity tend to be constant value. The change of pore structure can be the key factor leading to the reduction of electrical resistivity of soil subjected to wetting-drying cycles and consequently causing the decrease of soil strength in the present study. Thus, the electrical resistivity can be adopted to indirectly assess the mechanical behaviour of unsaturated compacted soil after wetting-drying cycles.

Mpt in the Air Force

1986 ◽  
Vol 30 (13) ◽  
pp. 1294-1295
Author(s):  
John Speigel ◽  
Mike Skinner
Keyword(s):  
Air Force ◽  
Weapon System ◽  
Integration System ◽  
Weapon Systems ◽  
System Acquisition ◽  
And Performance ◽  
And Training ◽  
Equal Consideration

The Air Force recognizes the importance of Manpower, Personnel, and Training (MPT) issues in weapon system acquisition. To give supportability of future weapon systems equal consideration to cost, schedule, and performance of the system, the Air Force has set out to build an integration system to monitor MPT issues.

scholarly journals EAGLE: An Interactive Engine/Airframe Life Cycle Cost Model

1982 ◽  
Author(s):  
E. J. Reed ◽  
R. R. Horton ◽  
J. B. Fyfe
Keyword(s):  
Life Cycle ◽  
Life Cycle Cost ◽  
Development Process ◽  
Cost Model ◽  
Aircraft Engine ◽  
Preliminary Design ◽  
Weapon System ◽  
Technology Evaluation ◽  
Advance Technology ◽  
Design Decisions

A major portion of the Life Cycle Cost (LCC) of a modern high technology weapon system is determined by design decisions made very early in the development process. Many of these decisions are so fundamental that later changes become impractical. As a result, a usage-sensitive, interactive aircraft engine LCC model has been developed by Pratt & Whitney Aircraft to evaluate and prioritize potential technology candidates during conceptual/preliminary design. This paper discusses the development of the EAGLE (Engine/Airframe Generalized LCC Evaluator) model, its validation using results from the Advance Technology Engine Studies (ATES), and includes an example engine technology evaluation.

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