The 2002 Version Of The Aeroprediction Code
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The 2002 Version Of The Aeroprediction Code
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 2002
The 2002 Version Of The Aeroprediction Code written by Frankie Gale Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Aerodynamics categories.
A new version of the aeroprediction code (APC), the AP02, has been developed to address the requirements arising from advanced weapon concepts. The AP02 was formed by adding significant new technology and several productivity improvements to the previous version of the APC, the AP98. New technology added included 6 and 8 fin aerodynamics, improved nonlinear aerodynamics, improved pitch damping predictions, improved power-on base drag estimates, base-bleed effect on base drag estimation, improved axial force of nonaxisymmetric bodies and trailing-edge flap capability. Other improvements and productivity enhancements include an aerodynamic smoother, ballistic and three degree-of-freedom simulation modules as well as refinements for the pre- and post-processor for inputs and outputs of the AP02. Comparison of the predicted aerodynamics of the AP02 to AP98 and experimental data showed the AP02 to be slightly better than the AP98 in most cases that both codes would handle. However, due to the additional new technology incorporated into the AP02, many new options are available in the AP02 that are not available in the AP98. Therefore, the AP02 is more robust and, on average, is slightly more accurate than the AP98 in predicting aerodynamics of weapons.
Improvements In Pitch Damping For The Aeroprediction Code With Particular Emphasis On Flare Configurations
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 2000
Improvements In Pitch Damping For The Aeroprediction Code With Particular Emphasis On Flare Configurations written by Frankie Gale Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Aerodynamics categories.
New capability has been added to the NSWC aeroprediction code to allow aerodynamics to be predicted for Mach numbers up to 20 for configurations with flares. This new capability includes extending the static aerodynamic predictions for Mach numbers less than 1.2, improving the body alone pitch damping for Mach numbers above 2.0, and developing a new capability for pitch damping of flared configurations at Mach numbers up to 20. This new capability for flared configurations was validated for several different configurations in the Mach number range of 2 to 8.8. In general, pitch damping predictions of the improved capability was within 20 percent of either experimental data or computational fluid dynamics calculations. This accuracy level is believed to be quite adequate for dynamic derivatives in the preliminary design stage. These new additions to the aeroprediction code will be transitioned to users as part of the 2002 version of the code (APO2).
Improved Power On Base Drag Methodology For The Aeroprediction Code
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 2001
Improved Power On Base Drag Methodology For The Aeroprediction Code written by Frankie Gale Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Aerodynamics categories.
Improved methods for base pressure prediction under base bleed and rocket motor-on conditions have been developed. The base bleed method makes several refinements to the method developed by Danberg at the Army Research Laboratory in Aberdeen, Maryland. The improved rocket motor-on, base pressure prediction improves upon the method developed at the Army Missile Command in Huntsville, Alabama by Brazzel and some of his colleagues. The major refinement to the base bleed method of Danberg was to estimate the power-off value of base pressure empirically based on an extensive data base, as opposed to using computational fluid dynamics codes to predict this term. The major modifications to the power-on base pressure prediction method of Brazzel was to extend its range of applicability to high values of thrust coefficient, to Mach numbers less than 1.5, and to different afterbody shapes. In comparing the improved methods for power-on base drag prediction to experiment, it was seen that both methods gave reasonable agreement to most experimental data bases. However, more validation is needed, particularly for the combined effects of angle of attack, fins, and power-on conditions.
Refinements In The Aeroprediction Code Based On Recent Wind Tunnel Data
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 1999
Refinements In The Aeroprediction Code Based On Recent Wind Tunnel Data written by Frankie Gale Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Aerodynamics categories.
Prediction Of The Pitch Damping Coefficients Using Sacks Relations
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Author : Paul Weinacht
language : en
Publisher:
Release Date : 2004
Prediction Of The Pitch Damping Coefficients Using Sacks Relations written by Paul Weinacht and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Pitching (Aerodynamics) categories.
Throughout its development, slender body theory has been generalized to predict a large variety of aerodynamic coefficients for a wide class of flight bodies. For most applications, slender body theory provides only a qualitative predictive capability. There is, however, a set of slender body relationships which has been previously derived by Sacks that allows the individual pitchdamping coefficients and the pitch-damping coefficient sums to be related to each other. Until recently, it has been difficult to assess the accuracy of these relationships due to the lack of high-quality pitch-damping data or the lack of a higher order theory. The current work applies a recently developed computational fluid dynamics capability for predicting all three pitch-damping coefficients. From this analysis, the accuracy of these relationships has been assessed and their engineering significance demonstrated. One important result is that the pitch-damping relations developed by Sacks allow the individual pitch-damping coefficients to be determined from the pitch-damping coefficient sum with a high degree of accuracy.
Analytical Prediction Of Trajectories For High Velocity Direct Fire Munitions
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Author : Paul Weinacht
language : en
Publisher:
Release Date : 2005
Analytical Prediction Of Trajectories For High Velocity Direct Fire Munitions written by Paul Weinacht and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Military weapons categories.
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 regime has been determined. From the simplified analysis, many important flight characteristics can be determined. These include the velocity-time-range relationships, change in impact velocity due to change in muzzle velocity, gravity drop, change in impact location due to muzzle velocity and muzzle retardation variability, and crosswind deflection. The analysis shows that the muzzle velocity and muzzle retardation are the dominant terms defining these relationships. The shape of the drag curve is shown to be a higher-order effect which, in some cases, can be neglected. To validate these relationships, comparisons are made with numerical trajectory predictions for fielded direct-fire munitions using the measured drag data.
A Simplified Method For Predicting Aerodynamics Of Multi Fin Weapons
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 1999
A Simplified Method For Predicting Aerodynamics Of Multi Fin Weapons written by Frankie Gale Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Aerodynamics categories.
41st Aiaa Aerospace Sciences Meeting Exhibit
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Author :
language : en
Publisher:
Release Date : 2003
41st Aiaa Aerospace Sciences Meeting Exhibit written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Aeronautics categories.
39th Aiaa Asme Sae Asee Joint Propulsion Conference Exhibit July 20 23 2003 Huntsville Alabama 03 4600 03 4649
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Author :
language : en
Publisher:
Release Date : 2003
39th Aiaa Asme Sae Asee Joint Propulsion Conference Exhibit July 20 23 2003 Huntsville Alabama 03 4600 03 4649 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Airplanes categories.
Aerospace America
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Author :
language : en
Publisher:
Release Date : 2002
Aerospace America written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Aeronautics categories.