Community Noise Exposure Resulting from Aircraft Operations. Volume 3. Acoustic Data on Military Aircraft: Air Force Attack/Fighter Aircraft

1978 ◽  
Author(s):  
Jerry D. Speakman ◽  
Robert G. Powell ◽  
Robert A. Lee
Keyword(s):  
Air Force ◽  
Noise Exposure ◽  
Military Aircraft ◽  
Fighter Aircraft ◽  
Acoustic Data ◽  
Community Noise

Dynamic Inlet Simulation Demonstration for Airframe-Propulsion Integration Using HPCMP CREATE™-AV Kestrel

2017 ◽  
Author(s):  
Jason B. Klepper ◽  
James R. Sirbaugh ◽  
Milt W. Davis
Keyword(s):  
Mach Number ◽  
Wind Tunnel ◽  
Wind Tunnel Test ◽  
Systems Design ◽  
Computational Results ◽  
Military Aircraft ◽  
Fighter Aircraft ◽  
Inlet System ◽  
Weapon Systems ◽  
Dynamic Hybrid

The purpose of an aircraft inlet system is to capture airflow from the free-stream and deliver it to an engine at the appropriate Mach number for that system. To meet design constraints, modern fighter aircraft have complex inlets with multiple turns that generally lead to both total pressure and swirl distortion at the engine face. These flow distortions can lead to reduced system performance, operability, and durability introducing issues in the overall success of the weapons system performing its mission. Therefore the integration of the airframe, inlet, and propulsion system is a key design issue in the development of military aircraft. The purpose of this paper is to demonstrate the dynamic (hybrid RANS/DDES) simulation capabilities of the HPCMP CREATE™-AV Kestrel tools by application to a sub-scale airframe/inlet system for a current military aircraft. The computational results were compared to wind tunnel results at various Mach number, angles of attack, angles of sideslip, and corrected flow rates. The inlet pressure recovery and distortion intensities for each case compared well to wind tunnel results. By comparing the computational results and wind tunnel test results, the applicability of these tools to future weapon systems design and development can be assessed.

Thunder Versus Lightning: A Performance and Cost Analysis of the A-10 “Warthog” Versus the F-35 Joint Strike Fighter

2019 ◽  
Vol 10 (3) ◽  
pp. 434-468
Author(s):  
John Green ◽  
Richard Zeckhauser
Keyword(s):  
Quantitative Analysis ◽  
Service Life ◽  
Cost Analysis ◽  
Air Force ◽  
Fighter Aircraft ◽  
Low Intensity ◽  
Effectiveness Analysis ◽  
Critical Requirement ◽  
Cas A ◽  
The U.S

AbstractFor decades, the U.S. Air Force has contemplated replacing the A-10 Thunderbolt II “Warthog” with a newer fighter aircraft. However, a quantitative analysis comparing the Warthog’s performance and costs with those of its intended replacement, the F-35 Lightning II Joint Strike Fighter, shows that retiring the Warthog would be operationally unsound and fiscally imprudent. The rationale for the replacement is that it would increase airpower capability while controlling costs. That rationale does not withstand scrutiny. An effectiveness analysis based on results from a survey of joint terminal attack controllers indicates that the A-10 vastly outperforms the F-35 in providing close-air support (CAS), a critical requirement for future conflicts against terrorists and insurgents. A cost analysis demonstrates that replacing the A-10 before its service life ends in 2035 would cost at least $20.9 billion. The replacement plan would waste substantial resources and seriously impair U.S. military capabilities. Given that constrained future budgets and low-intensity conflicts requiring precision CAS can be expected, the U.S. air fleet should include the A-10 Thunderbolt II.

Superplastic Forming and Diffusion Bonding of Aircraft Structures

1995 ◽  
Vol 209 (3) ◽  
pp. 227-231 ◽  
Author(s):  
I E Bottomley
Keyword(s):  
Diffusion Bonding ◽  
Superplastic Forming ◽  
Development Programme ◽  
Parent Metal ◽  
Military Aircraft ◽  
Paper Briefly ◽  
Significant Cost ◽  
Fighter Aircraft ◽  
Metal Joint ◽  
And Diffusion

The diffusion bonding (DB)/superplastic forming (SPF) manufacturing process, for titanium 6A1/4V material, has been developed within British Aerospace for the manufacture of military aircraft components. Diffusion bonding of titanium alloys offers the potential for parent metal joint strengths, and when combined with SPF, complex aircraft components offering significant cost and weight savings can be manufactured. This paper briefly describes the DB/SPF development programme and the manufacture of the Tornado heat exchanger ducts and European Fighter Aircraft (EFA) foreplane components.

Evaluation of Nanofluids as Potential Novel Coolant for Aircraft Applications: The Case of De-ionized Water-Based Alumina Nanofluids

2014 ◽  
Vol 136 (5) ◽  
Author(s):  
Javier A. Narvaez ◽  
Aaron R. Veydt ◽  
Robert J. Wilkens
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Convective Heat Transfer ◽  
Air Force ◽  
Convective Heat ◽  
Military Aircraft ◽  
Particle Settling ◽  
Water Based ◽  
Transfer Problems

There is a critical need for improved coolants for military aircraft applications. The objective of this research is to evaluate nanofluids as potential replacement for the coolant currently used by the Air Force. Alumina/DI water nanofluids were evaluated. It was observed that at the same volumetric flow there was no significant improvement in convective heat transfer. Problems associated with the nanofluids were observed: increase of pressure drop with concentration, particle settling, and especially evidence of vaporization promoted by the nanoparticles. Results raised doubts about the applicability of using nanofluids as alternative coolants for avionic applications.

scholarly journals ARAS-FUCOM approach for VPAF fighter aircraft selection

2021 ◽  
pp. 53-62
Author(s):  
Pham Van Hoan ◽  
Yonghoon Ha
Keyword(s):  
Decision Making ◽  
Air Force ◽  
Decision Makers ◽  
Decision Making Process ◽  
Fighter Aircraft ◽  
Product Method ◽  
Final Weight ◽  
Ranking Of Alternatives ◽  
The Military ◽  
Consistency Method

Multi-criteria decision making (MCDM) methods are systematical science projects to help decision-makers reach accurate decisions. Applying MCDM methods in the military is important because accurate decision making is the deciding factor for success and can reduce expenditure and increase defense capability. The full consistency method (FUCOM), one of the methods in the MCDM group, has many advantages, and its results are reliable. This paper aims to evaluate and select an appropriate fighter aircraft for Vietnam People’s Air Force. Using FUCOM as a decision-making process, we find the final weight values of criteria and apply the additive ratio assessment (ARAS) method to derive the final ranking of alternatives to comply with criteria. Sensitivity analysis is conducted and the result is compared with the weighted product method to substantiate the sturdiness of the proposed method. The results show the Su-35 as the best available solution.

scholarly journals Lockheed Martin And The Controversial F-35

2014 ◽  
Vol 11 (1) ◽  
pp. 1 ◽  
Author(s):  
Michael P. Hughes
Keyword(s):  
Air Force ◽  
American History ◽  
Armed Forces ◽  
Fighter Aircraft ◽  
Cost Overruns ◽  
Technical Problems ◽  
Foreign Countries ◽  
The 1950S

Over the course several years - from late in the 1950s to the early 1970s - Lockheed was embroiled in the Deal of the Century where the company was found guilty of bribing foreign countries governments to select the Lockheed F-104 Starfighter over arguably better alternatives in addressing those nations respective air force needs. Today, Lockheed Martin is the leading contractor on the F-35 Lightning II project, which is intended to produce the worlds most advanced stealth strike-fighter for US armed forces and those of several allied foreign nations. However, the F-35 program has become the single most expensive project in American history and has been beset with serious technical problems, major schedule delays, cost overruns, and the F-35s performance capabilities are seen by many as inferior to the nations potential adversaries fighter aircraft, if not inferior to the aircraft it is intended to replace.

U.S. Air Force research on military aircraft noise and its effects

1999 ◽  
Vol 105 (2) ◽  
pp. 1276-1276
Author(s):  
Lawrence S. Finegold ◽  
Robert A. Lee ◽  
Richard L. McKinley
Keyword(s):  
Air Force ◽  
Aircraft Noise ◽  
Military Aircraft
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