| Navier-Stokes Predictions of Dynamic Stability Derivatives: Evaluation of Steady-State Methods |
Sep-2008 |
44 pages |
| Authors:
Paul Weinacht; James DeSpirito; Sidra I Silton; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
 | The prediction of the dynamic stability derivatives-roll-damping, Magnus, and pitch-damping moments-were evaluated for three spin-stabilized projectiles using steady-state computational fluid dynamic (CFD) calculations. Roll-damping CFD predictions were found to be very good across the Mach number range investigated. Magnus moment predictions were very good in the supersonic flight regime; however, the accuracy varied in the subsonic and transonic flight regime. The best Magnus moment prediction in the subsonic flight regime ... |
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| Advanced and Adaptable Military Propulsion |
22 JAN 2008 |
31 pages |
| Authors:
Alan H. Epstein; Choon S. Tan; MASSACHUSETTS INST OF TECH CAMBRIDGE GAS TURBINE LAB
|
| Analyses and calculations were carried out to quantify the gain in performance (as measured in terms of thrust specific fuel consumption and range productivity) in aircraft turbine engines incorporating adaptability/variability. A 5-10% variability in (turbine and propelling) nozzle areas would allow the compression system to have an operating point for subsonic loiter identical to that for supersonic flight to destination, resulting in a 20% improvement in thrust specific fuel consumption. ... |
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| Fuel Injection Strategy for a Next Generation Pulse Detonation Engine |
JUN 2006 |
79 pages |
| Authors:
Tad J. Robbins; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Pulse Detonation Engine offers the Department of Defense a new low cost, light weight, and efficient solution to supersonic flight on many of its small airborne platforms. In the past, both liquid fuel and gaseous fuel designs have been partially developed and tested. Several aspects of these configurations have led to the need for the development of a new design, in particular the reduction of total pressure losses, and ... |
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| Store Separations From a Supersonic Cone |
MAR 2006 |
109 pages |
| Authors:
Richard J. Simko; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The purpose of this research was to analyze the environment a store would travel through if ejected from a supersonic cone. This was done using the Beggar Computational Fluid Dynamics (CFD) code from the Air Force SEEK Eagle Office at Eglin Air Force Base, FL. CFD simulations were compared to experimental results from a previous AFIT thesis and conclusions were drawn based on whether or not the current wind tunnel ... |
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| Flight Test Experiments Foreseen for USV |
OCT 2005 |
39 pages |
| Authors:
G. Ruso; P. P. De Matteis; M. Pastena; G. Marino; CENTRO ITALIANO RICERCHE AEROSPAZIALI CAPUA
|
| The Strategic Target of the USV Program is the development of a multi-purpose flying testbed for advanced atmospheric re-entry from a circular LEO at about 200 km The technological developments associated to this target are focused on the evolution of space transportation systems, oriented towards the aerospaceplane (SSTO-HTHL), believed to be sooner or later the future generation system concept. The qualifying character of the USV vehicles is the behavior of ... |
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| Report of the Defense Science Board Task Force on Aerial Targets |
OCT 2005 |
61 pages |
| Authors:
William P. Delaney; Michael Williams; DEFENSE SCIENCE BOARD WASHINGTON DC
|
| The Defense Science Board Task Force on Aerial Targets was convened in December 2004 to assess the future (2005 to 2020) needs for aerial targets for developmental and operational testing and for training of air defense systems against air-breathing threats. Ballistic missile threats and targets were not part of the Task Force charter. The aerial targets involve full-scale aircraft, subsonic and supersonic cruise missiles, rotary wing vehicles, and unmanned aerial ... |
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| Analytical Prediction of Trajectories for High-Velocity Direct-Fire Munitions |
AUG 2005 |
72 pages |
| Authors:
Paul Weinacht; Gene R. Cooper; James F. Newell; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| An analysis of the velocity-time-range equations for direct-fire munitions has been performed. The analysis characterizes these munitions in terms of three parameters: muzzle velocity, muzzle retardation (or velocity fall-off), and a single parameter defining the shape of the drag curve. Using firing tables drag data for a variety of munitions, the expected range of values of the single parameter defining the shape of the drag curve in the supersonic flight ... |
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| Flight Testing of Laminar Flow Control in High-Speed Boundary Layers |
01 OCT 2004 |
9 pages |
| Authors:
William S. Saric; Helen L. Reed; Daniel W. Banks; ARIZONA STATE UNIV TEMPE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| This paper presents data from a series of laminar-flow flight tests at NASA Dryden flight Research Center on the F-15B. It is shown that periodic discrete roughness elements near the leading can increase the laminar flow region at both supersonic and subsonic flight Mach numbers. Infra-red thermography was used to visualize laminar-turbulent transition. Although the experiment was designed for Mach 1.85, it was possible to obtain data at other Mach ... |
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| Isomer Heat Exchanger Combustor Replacement for a Supersonic Ramjet Powered Vehicle |
JUN 2004 |
59 pages |
| Authors:
Jonathan C. Cox; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This study investigated the possibility of utilizing a Triggered Isomer Heat Exchanger (TIHE) within a ramjet engine to power a supersonic Conventional Air Launched Cruise Missile (CALCM). A computational ramjet engine was created using engine analysis software. This model was then run through a simulated cruise missile mission using AEDsys, a mission analysis and engine performance software suite. The replacement of the combustor with a TIHE led to an impressive ... |
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| Flow Around an Object Projected from a Cavity into a Supersonic Freestream |
MAR 2004 |
90 pages |
| Authors:
Scott T. Bjorge; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The pressure and flow field of a supersonic flow over a cavity, with and without a store, was the focus of this experiment. One cavity geometry (length to depth ratio 3.6) was studied; the freestream Mach number and the placement of the store relative to the cavity floor were varied. The pressure spectra on the cavity floor were markedly different between Mach numbers of 1.8 and 2.9. The Mach 1.8 ... |
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| Prediction of Projectile Performance, Stability, and Free-Flight Motion Using Computational Fluid Dynamics |
JUL 2003 |
32 pages |
| Authors:
Paul Weinacht; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| With the recent development of capabilities for predicting the damping derivatives, it is now possible to predict the stability characteristics and free-flight motion for projectiles using data that are derived solely from computational fluid dynamics (CFD). As a demonstration of the capability, this report presents results for a family of axisymmetric projectiles in supersonic flight. The particular configuration selected for this computational study has been extensively tested in aeroballistic ranges, ... |
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| Vortex Flow Dilemmas and Control on Wing Planforms on High Speed |
MAR 2003 |
|
| Authors:
R. K. Nangia; A.S. MILLER; NATO RESEARCH AND TECHNOLOGY AGENCY CEDEX (FRANCE)
|
 | Aircraft for sustained supersonic flight usually feature low aspect ratio wings with varying (reducing) leading edge sweep over the outer portion to achieve an adequate low-speed performance. A high-speed "cruise" wing then becomes subject to mixed flows at low-speeds including strong Vortical flows. |
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| In-Flight Flow Visualization Results of the F-106B with a Vortex Flap |
MAR 2003 |
35 pages |
| Authors:
Jay M. Brandon; James B. Hallissy; Philip W. Brown; John E. Lamar; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CENTER
|
| Surface and off-surface flow visualization techniques were used to visualize the three-dimensional vortex flows on the F-106 aircraft with vortex flaps installed. Results at angles of attack between 9 degrees and 18 degrees and Mach numbers from 0.3 to 0.9 are presented. A smoke flow vapor screen technique was used to document leading-edge vortex paths and sizes, while an oil flow technique was employed to provide detailed information on reattachment ... |
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| Navier-Stokes Computations for a Spinning Projectile From Subsonic to Supersonic Speeds |
SEP 2002 |
38 pages |
| Authors:
Sidra I. Silton; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A computational study has been undertaken to predict the aerodynamic coefficients of a standard spinning projectile using a modem unstructured Navier-Stokes flow solver. Numerical and semi-empirical results have been obtained for a wide range of Mach numbers to include subsonic, transonic, and supersonic flight regimes. Effects of 00, 20, and 50 angles of attack have been investigated. Comparison of computational fluid dynamics results to both experimental range data and semi-empirical ... |
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| Quiet Supersonic Platform (QSP) Materials and Structures Focus Group Meeting, 26 June 2001 |
JUL 2001 |
|
| Authors:
Andrea Hartman; William Long; Lisa Veitch; INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA
|
| This document is a proceedings of presentations and discussions conducted at Focus Group meeting on Materials and Structures for the DARPA Quiet Supersonic Platform (QSP) program, which took place at the Institute for Defense Analyses in June 2001. Attendees from aircraft companies, universities, and Government laboratories discussed possible new materials and structures fabrication approaches applicable to lightweight aircraft capable of supersonic flight, as defined by the Goals of the QSP ... |
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| Russian Convetional Arms Transfers Since 1991: Implications for U.S. Naval Forces |
MAR 2001 |
88 pages |
| Authors:
Neil A. Hannon; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis analyzes the Russian Federation's conventional arms transfers since the collapse of the Soviet Union in 1991. Russia looks to the sale of conventional arms as a promising source of capital income and a viable method to maintain its state defense industry. Due to a substantial decrease in sales volume, the international conventional arms market has become extremely competitive over the last decade. This competitiveness has driven exporters including ... |
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| Russian Conventional Arms Transfers Since 1991: Implications for U.S. Naval Forces |
MAR 2001 |
88 pages |
| Authors:
Neil A. Harmon; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis analyzes the Russian Federation's conventional arms transfers since the collapse of the Soviet Union in 1991. Russia looks to the sale of conventional arms as a promising source of capital income and a viable method to maintain its state defense industry. Due to a substantial decrease in sales volume, the international conventional arms market has become extremely competitive over the last decade. This competitiveness has driven exporters, including ... |
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| High-Speed Flight and the Military |
APR 1999 |
60 pages |
| Authors:
Matthew H. Molloy; AIR COMMAND AND STAFF COLL MAXWELL AFB AL
|
| This paper makes a qualitative assessment of NASA's High-Speed Research program and its associated High-Speed Civil Transport (HSCT) program to answer the question of whether or not this Mach 2.4-class, 300 passenger transport and its supersonic business jet (SSBJ) counterpart could have value to future military operations. This research found that supersonic transports such as the HSCT and the SSBJ could be in production within 10-20 years. Based on the ... |
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| Development of the Aerodynamic/Aeroservoelastic Modules in ASTROS. Volume 3. ZAERO Applications Manual |
04 FEB 1999 |
120 pages |
| Authors:
P. C. Chen; D. Sarhaddi; D. D. Liu; A. G. Striz; ZONA TECHNOLOGY INC SCOTTSDALE AZ
|
| This report is a part of the documentations which describe the complete development of an STTR Phase 2 effort entitled, Development of the Aerodynamic/Aeroservoelastic Modules in ASTROS. This report is one of four manuals that comprise the final report. The remaining reports consist of the ZAERO User's Manual (Volume 1), the ZAERO Programmer's Manual (Volume 3) and the ZAERO Theoretical Manual (Volume 4). ASTROS is the ... |
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| Development of the Aerodynamic/Aeroservoelastic Modules in ASTROS. Volume 1. ZAERO User's Manual |
04 FEB 1999 |
88 pages |
| Authors:
P. C. Chen; D. Sarhaddi; D. D. Liu; ZONA TECHNOLOGY INC SCOTTSDALE AZ
|
| This report is a part of the documentations which describe the complete development of an STTR Phase 2 effort entitled, Development of the Aerodynamic/Aeroservoelastic Modules in ASTROS. This report is one of four manuals that comprise the final report. The remaining reports consist of the ZAERO Programmer's Manual (Volume 2), the ZAERO Applications Manual (Volume 3) and the ZAERO Theoretical Manual (Volume 4). ASTROS is ... |
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| Development of the Aerodynamic/Aeroservoelastic Modules in ASTROS. Volume 2. ZAERO Programmer's Manual |
04 FEB 1999 |
105 pages |
| Authors:
P. C. Chen; D. Sarhaddi; D. D. Liu; ZONA TECHNOLOGY INC SCOTTSDALE AZ
|
| This report is a part of the documentations which describe the complete development of an STTR Phase 2 effort entitled, Development of the Aerodynamic/Aeroservoelastic Modules in ASTROS. This report is one of four manuals that comprise the final report. The remaining reports consist of the ZAERO User's Manual (Volume 1), the ZAERO Applications Manual (Volume 3) and the ZAERO Theoretical Manual (Volume 4). ASTROS is the ... |
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| Development of the Aerodynamic/Aeroservoelastic Modules in ASTROS. Volume 4. ZAERO Theoretical Manual |
04 FEB 1999 |
160 pages |
| Authors:
P. C. Chen; D. Sarhaddi; D. D. Liu; ZONA TECHNOLOGY INC SCOTTSDALE AZ
|
| This report is a part of the documentations which describe the complete development of an STTR Phase 2 effort entitled, Development of the Aerodynamic/Aeroservoelastic Modules in ASTROS. This report is one of four manuals that comprise the final report. The remaining reports consist of the ZAERO User's Manual (Volume 1), the ZAERO Programmer's Manual (Volume 2) and the ZAERO Applications Manual (Volume 3). ASTROS is the ... |
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| Solid Fuel Ramjet Regulation by Means of an Air Division Valve |
1999 |
|
| Authors:
Deborah Pelosi-Pinhas; Alon Gany; TECHNION - ISRAEL INST OF TECH HAIFA FACULTY OF AEROSPACE ENGINEERING
|
| An analytical study was conducted, developing a theoretical model for the regulation of solid fuel ramjets by means of an air division valve. The solid fuel ramjet motor is the simplest air-breathing propulsion means for supersonic flights. However, the variable flight conditions over the operating envelope of altitudes and velocities significantly affect the motor performance. Regulation requirement was defined in this study as the motor capability of ... |
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| The Quest for Air Dominance: F-22--Cost Versus Capability |
APR 1998 |
45 pages |
| Authors:
Thomas W. Hampton; AIR COMMAND AND STAFF COLL MAXWELL AFB AL
|
| Since the incorporation of the airplane into military service, air superiority has been a key ingredient to success on the modern battlefield. Global Engagement: A Vision for the 21st Century Air Force, the USAF's latest vision statement, lists air and space superiority as the first of six Air Force core competencies. The F-15 Eagle is currently the USAF's primary air superiority fighter. Designed in the 1960s and introduced into service ... |
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| IUTAM Symposium on Dynamics of Slender Vortices |
04 SEP 97 |
110 pages |
| Authors:
TECHNISCHE HOCHSCHULE AACHEN (GERMANY F R) AERODYNAMISCHES INST
|
| The Final Proceedings for IUTAM Symposium on Dynamics of Slender Vortices, 31 August-3 September 1997. Topics include: (1) asymptotic theories, (2) numerical methods, (3) vortices in shear layers, (4) interaction of vortices, (5) vortex breakdown, (6) vortex sound, and (7) aircraft and helicopter vortices. |
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| Architects of American Air Supremacy; Gen Hap Arnold and Dr. Theodore von Karman |
SEP 97 |
458 pages |
| Authors:
Dik Daso; AIR UNIV MAXWELL AFB AL
|
| The United States Air Force is the most technologically advanced service in the world. Stealth, precision, global range, and space systems are only a few of the hallmarks of USAF technology. Airborne laser weapons, super- accurate sensors, and hypersonic aircraft are already in the early stages of development. Creations such as these are not the product of stagnant minds or idle hands. It was in 1944 that General of the ... |
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| Unstructured h-p Finite Elements for Unsteady High Speed Flows |
APR 97 |
6 pages |
| Authors:
George E. Karniadakis; BROWN UNIV PROVIDENCE RI DIV OF APPLIED MATHEMATICS
|
| There is currently a great interest in predicting the motion and corresponding loads of highly maneuverable aircraft capable of controlled flight at very high angles of attack. The design of air-to-air missiles could also benefit greatly from a better understanding of high angle of attack supersonic flight. Unsteady separation and formation of strongly asymmetric vortices from such bodies can introduce substantial lateral forces and yawing moments that must be counteracted ... |
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| An Evaluation of Structural Damage (Window Breakage) Potential in Callente, NV Under Current Supersonic Flight Restrictions at Nellis AFB |
JAN 97 |
19 pages |
| Authors:
Joel Garrelick; Kyle Martini; Ron Brown; J. M. Downing; CAMBRIDGE ACOUSTICAL ASSOCIATES INC MA
|
| During November 1996 a series of tests was performed in and around Caliente, NV. These tests, performed by the firms of Cambridge Acoustical Associates, Inc., and Wyle Laboratories, Inc., are part of a Small Business Innovative Research (SBIR) project, being sponsored by the Armstrong Laboratory of the United States Air Force. The project objective is to perfect measurement techniques that simulate structural response to sonic booms, and in turn allow ... |
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| Experimental Characterization of Gas Turbine Emissions at Simulated Flight Altitude Conditions |
SEP 96 |
158 pages |
| Authors:
R. P. Howard; J. C. Wormhoudt; P. D. Whitefield; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
|
| NASA's Atmospheric Effects of Aviation Project (AEAP) is developing a scientific basis for assessment of the atmospheric impact of subsonic and supersonic aviation. A primary goal is to assist assessments of United Nations scientific organizations and hence, consideration of emissions standards by the International Civil Aviation Organization (ICAO). Engine tests have been conducted at AEDC to fulfill the need of AEAP. The purpose of these tests is to obtain a ... |
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| Navier-Stokes Computations of Finned Kinetic Energy Projectile Base Flow |
SEP 95 |
65 pages |
| Authors:
Bernard J. Guidos; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A computational fluid dynamics (CFD) study of finned kinetic energy projectile base flow is presented for a 105-mm M735 projectile in supersonic flight. A parabolized Navier-Stokes technique is used to compute the attached flow of the forebody and fins. An unsteady Navier-Stokes technique is used to compute the flow in the base region. Several CFD solutions for freestream Mach numbers 3, 4, and 5 are presented, and the modeling approach ... |
|
| The Hypersonic Revolution. Volume 2. From Max Valier to Project Prime |
AUG 95 |
676 pages |
| Authors:
Richard P. Hallion; AERONAUTICAL SYSTEMS CENTER WRIGHT-PATTERSON AFB OH
|
| The hypersonic revolution has been a particularly American one, borne of the national pursuit of transonic and supersonic flight technology. True, it does have both domestic and international dimensions, in the prophecy of Robert Goddard, Hermann Oberth, and Konstantin Tsiolkovskiy at the beginning of the twentieth century, and in the prescient (if impractical) studies of Eugen Sanger and Irene Bredt (later Irene Sanger-Bredt) near mid-century. But if its inspiration was ... |
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| The 1995 Version of the NSWC Aeroprediction Code: Part 1. Summary of New Theoretical Methodology |
FEB 95 |
111 pages |
| Authors:
Frank G. Morre; Roy M. Mcinville; Tom Hymer; NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The NSWC Aeroprediction Code has been extended to angles of attack (AOA) greater than 30 deg. To accomplish this, several data bases were used to approximate the nonlinearities in individual missile component aerodynamics. Theoretical aerodynamic methods are used at small AOA. The new semiempirical model was applied to several configurations and the empirical constants adjusted to eliminate some of the errors associated with wind tunnel measurements of individual missile component ... |
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| Compressible Turbulence Measurements in a Supersonic Boundary Layer Including Favorable Pressure Gradient Effects |
13 DEC 94 |
115 pages |
| Authors:
Raymond S. Miller; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The effect of a favorable pressure gradient on the turbulent flow structure in a Mach 2.9 boundary layer (Re/m approx. 1.5 x 10(exp 7)) is investigated experimentally. Conventional flow and hot film measurements of turbulent fluctuation properties have been made upstream of and along an expansion ramp. Upstream measurements were taken in a zero pressure gradient boundary layer 44 cm from the nozzle throat in a 6.35 cm square test ... |
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| State-To-State Collisional Dynamics of Atmospheric Species |
30 AUG 94 |
6 pages |
| Authors:
David J. Nesbitt; COLORADO UNIV AT BOULDER DEPT OF CHEMISTRY AND BIOCHEMISTRY
|
| THe AFOSR/AASERT research efforts over this past year have been toward the following two thrusts: (1) state-to-state collisional energy transfer in H2O, HF and CH4 in crossed molecular beams via high sensitivity, direct absorption of a single mode IR probe laser, and (2) development and testing of high resolution IR laser Dopplerimetry methods for measuring velocity and quantum-state resolved Cl + HCl scattering in open shell collision systems. |
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| Seasonal Sonic Boom Propagation Prediction |
MAR 94 |
61 pages |
| Authors:
W. R. Lundberg; ARMSTRONG LAB BROOKS AFB TX OCCUPATIONAL AND ENVIRONMENTAL HEALTH DIRECTORATE
|
| Seasonal variations in wind and temperature gradients are known to influence the propagation of sonic booms. This report examines predictive techniques in current use which may be refined for application to seasonal Environmental Impact Statements. The effects of seasonally averaged refractive atmospheres on the sonic boom carpet predictions for an example flight of an F- 111 at Mach 1.3 and 10,000 feet above Mean Sea Level (MSL) were documented. The ... |
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| The Use of Structural-Acoustic Reciprocity Techniques To Assess Potential Environmental (Structural) Damage From Sonic Booms |
DEC 93 |
56 pages |
| Authors:
Joel Garrelick; Kyle Martini; CAMBRIDGE ACOUSTICAL ASSOCIATES INC MA
|
| The potential environmental impact of supersonic operations includes damage to conventional and unconventional structures by sonic boom overpressures. The assessment of such damage requires dedicated flyovers for each site at great expense. We show that structural-acoustic techniques may be used to help provide such assessments in their absence. Tests are described whereby transfer functions relating structural response to sonic boom overpressure may be obtained using a stationary acoustic source and ... |
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| Solution of Euler Equations for Forebody-Inlet Ensemble of Aircraft at High Angle of Attack |
27 APR 93 |
|
| Authors:
Zheng Xiaoqing; Shen Huili; FOREIGN AEROSPACE SCIENCE AND TECHNOLOGY CENTER WRIGHT- PATTERSON AFB OH
|
| A computational procedure was developed to simulate inviscid flows over integrated forebody-inlet ensemble of an aircraft model. The analysis, which includes the effect of Mach number, angle of attack and engine mass flow, is based on the solution of three-dimensional Euler equations. A finite-volume spatial discretization and a Runge-Kutta time stepping scheme are employed in solving the equations. To achieve the required geometric flexibility, a multizone mesh is used. The ... |
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| Proceedings of the Second International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration (2nd) Held in Auburn University, Alabama on 4-6 March 1992. Volume 3 |
06 MAR 92 |
|
| Authors:
Malcolm J. Crocker; P. K. Raju; AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING
|
| Topics covered in the Proceedings include Sound Intensity, Structural Intensity, Modal Analysis and Synthesis, Statistical Energy Analysis and Energy Methods, Passive and Active Damping, Boundary Element Methods, Diagnostics and Condition Monitoring, Material Characterization and Non-Destructive Evaluation, Active Noise and Vibration Control, Sound Radiation and Scattering, and Finite Element Analysis. There are also six keynote papers on Aeroacoustics and Atmospheric Sound, Vibro-Acoustic Reciprocity, Underwater Acoustic Scattering, Acoustical Technology for Non-Destructive Evaluation, ... |
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| Proceedings of the Second International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration (2nd) Held in Auburn University, Alabama on 4-6 March 1992. Volume 1 |
06 MAR 92 |
629 pages |
| Authors:
Malcolm J. Crocker; P. K. Raju; AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING
|
| This three-volume book of proceedings includes the written versions of the papers presented at the Second International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration held at Auburn University, March 4-6, 1992. Topics covered in the Proceedings include Sound Intensity, Structural Intensity, Modal Analysis, and Synthesis, Statistical Energy Analysis and Energy Methods, Passive and Active Damping, Boundary Element Methods, Diagnostics and Condition Monitoring, Material Characterization and Non-Destructive ... |
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| Proceedings of the Second International Congress on Recent Developments in Air- and Structure-Borne Sound and Vibration (2nd) Held in Auburn University, Alabama on 4-6 March 1992. Volume 2 |
06 MAR 92 |
491 pages |
| Authors:
Malcolm J. Crocker; P. K. Raju; AUBURN UNIV AL DEPT OF MECHANICAL ENGINEERING
|
| Topics covered in the Proceedings include Sound Intensity, Structural Intensity, Modal Analysis and Synthesis, Statistical Energy Analysis and Energy Methods, Passive and Active Damping, Boundary Element Methods, Diagnostics and Condition Monitoring, Material Characterization and Non-Destructive Evaluation, Active Noise and Vibration Control, Sound Radiation and Scattering, and Finite Element Analysis. In the last 30 years, improvements in computers have allowed rapid developments in both theoretical and experimental analysis of acoustics and ... |
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| Unsteady Transonic Aerodynamics of Pointed Bodies of Revolution in Supersonic Freestream, |
MAR 1992 |
|
| Authors:
P. Garcia Fogeda; A. Sanz; UNIVERSIDAD POLITECNICA DE MADRID (SPAIN) ESCUELA TECHNICA SUPERIOR DE INGENI EROS AERONAUTICOS
|
| A method to determine the aerodynamic forces acting on oscillating pointed bodies of revolution in transonic-supersonic flight has been developed. The nonlinear equation for the mean-flow perturbation potential and the time linearized equation for the cross-flow perturbation potential are both of hyperbolic type, for the Mach number range of interest, and have been solved by the method of characteristics. The method is valid for arbitrary frequencies of oscillation and can ... |
|
| Scanning Electron Microscopy of the Effects of Moisture and Elevated Temperature on the Fibre/Matrix Bond in CFRP |
AUG 91 |
|
| Authors:
G. D. Howard; ROYAL AEROSPACE ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
|
| The engineering properties of carbon fibre reinforced plastics (CFRPs) make them attractive materials with potential applications in many demanding markets. Because of their low density, CFRPs have high specific strength and stiffness thus offering substantial savings in weight. For these reasons, composites such as carbon fibre reinforced epoxy resins are increasingly being used in aircraft primary and secondary structures. Unlike metals however, epoxy resins are moisture-sensitive and absorbed moisture can ... |
|
| ZEUS User Manual 'Real Gas' Effects |
06 MAY 91 |
|
| Authors:
F. J. Priolo; A. B. Wardlaw Jr; NAVAL SURFACE WARFARE CENTER SILVER SPRING MD
|
| This report describes the extension and application of the ZEUS code to high, hypersonic Mach numbers by incorporating high-temperature equilibrium air or 'real gas' effects. This approach is important for accurate aerodynamic predictions in support of atmospheric reentry vehicles with high maneuverability and future hypersonic weapons. The program employs an automatic multiple zone grid generation technique which is particularly suited to describing missile- type geometries in supersonic flight. The ZEUS ... |
|
| Technical Evaluation Report on the Flight Mechanics Panel Symposium on the Flight Mechanics Panel Symposium on Space Vehicle Flight Mechanics (La Mecanique du Vol des Vehicules Spatiaux) |
NOV 90 |
|
| Authors:
N. X. Vinh; ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| In recent years, manned flights into low earth orbits have been made both for scientific study and for the placement of unmanned satellites into geosynchronous orbits and also into interplanetary orbits. Efforts are currently under way to place man into orbit on a semi-permanent basis through use of a space station. At the same time,the aerospace industry worldwide is considering the extension from supersonic flight of advanced fighter aircraft to ... |
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| Spike-Nosed Projectiles: Computations and Dual Flow Modes in Supersonic Flight |
AUG 90 |
|
| Authors:
Ameer G. Mikhail; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This study was made to assess the capability of a Computational Fluid Dynamic (CFD) method to adequately determine the aerodynamic coefficients for the unusual configurations of sharp-edged, spike-nosed projectiles that are of interest to the US Army. McCormack's time-dependent, explicit scheme was used for the full Navier-Stokes equations in a zonal gridding topology. Three configurations were computed at Mach = 1.72 and zero angle of attack. The results are compared ... |
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| External Flow Computations for a Finned 60MM Ramjet in Steady Supersonic Flight |
DEC 89 |
|
| Authors:
Bernard J. Guidos; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The US Army Ballistic Research Laboratory (BRL) has participated in the development of the launch and flight technologies for a family of solid fuel ramjet (SFRU) projectiles. The ramjet is a tubular projectile which utilizes air ingested through the inlet to burn the solid fuel. When the combustion process ceases, the projectile becomes a high drag configuration. Several designs have been developed as potential tank gun training rounds (TGTR) for ... |
|
| Environmental Assessment Reserve Military Operations Area |
DEC 89 |
181 pages |
| Authors:
TACTICAL AIR COMMAND LANGLEY AFB VA
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| The Record of Decision (ROD) allowing supersonic operations in the Reserve MOA stipulated: (1) Supersonic flight be limited to weekday, daylight operations of the 49th TFW and selected adversaries above 15,000 feet MSL, not to exceed 300 sorties per month in each MOA, (2) WSMR be first priority for supersonic training with the overflow equally divided between the Valentine and Reserve MOAs, (3) supersonic operations be confined to 22 X ... |
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| Incremental Drag due to Grooves and Threads for KE (Kinetic Energy) Projectiles |
MAR 89 |
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| Authors:
Ameer G. Mikhail; ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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| A prediction method for estimating the increment of increase in the drag coefficient due to the grooves on the surface of the body of a kinetic energy projectile is established based on wind tunnel data. Known existing methods give very poor results when compared to the experimental data. Twenty cases were considered for the present correlations and validation. The results achieved are very satisfactory. The present analysis considers parameters not ... |
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| Stability and Control of Tactical Missile Systems Held in Ankara (Turkey) on 9-12 May 1988 |
MAR 89 |
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| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
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| With recent advances in missile seekers and processors, and in the analysis of missile dynamics motions and the associated control subsystem designs, missile manoeuvre envelopes have significantly expanded. This symposium examined the stability and controllability of such missiles and provided a forum for discussing the different techniques currently involved in dealing with various aspects of this subject. The presentations ranged from prediction, simulation and test, through to a look at ... |
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| Noise and Sonic Boom Impact Technology. Sonic Boom Damage to Conventional Structures |
FEB 89 |
303 pages |
| Authors:
Jerold M. Haber; David Nakaki; BBN SYSTEMS AND TECHNOLOGIES CORP CANOGA PARK CA
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| United States Air Force supersonic aircraft operations generate sonic booms which may effect existing structures. Typical effects of the sonic boom range from a mild nuisance to damage to windows, plaster and bric-a-brac. A literature survey was performed to identify existing models, suitable for an environmental planner to use for assessing the impact of supersonic flights on conventional structures. A model developed by Hershey and Higgins was identified as the ... |
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SUPERSONIC FLIGHT
