The 1995 Version Of The Nswc Aeroprediction Code
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The 1995 Version Of The Nswc Aeroprediction Code
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 1995
The 1995 Version Of The Nswc 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 1995 with Angle of attack (Aerodynamics). categories.
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 loads. The new version of the code (AP95) was then pplied to several other missile configurations and estimates compared to data and other aerodynamic code calculations. Comparisons were made for Mach numbers 0.1 to 10.0 and AOA of 0 to 90 deg (not all data were available on any single configuration). In general, average accuracy levels of ±10 percent could be obrained for axial and normal force coefficeint and ±4 percent of body length for center of pressure, using the AP95. An exception to this was at AOA above 30 deg and at high supersonic Mach numbers, where nonlinearities caused by internal shock interactions were not accounted for. While these accuracy levels are very encouraging for a semiempirical code, improvements in the AP95 methodology could be made by additional missile-component wind-tunnel data at high AOA.
The 1998 Version Of The Nswc Aeroprediction Code
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 1998
The 1998 Version Of The Nswc 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 1998 with Aerodynamics categories.
The NSWC Aero prediction code has been extended to the roll position of 45 deg (fins in 'x' or cross roll orientation) in addition to the roll position of 0 deg (fins in '+' or plus roll orientation). It has also been extended to compute aerodynamics of nonaxisymmetric bodies based on an equivalent axisymmetric body. In addition, the nonlinear aerodynamic loads have been distributed over the body and lifting surfaces to provide a more useful tool for preliminary structural analysis. Finally, new technology was developed to improve the prediction of axial force at angle of attack (AOA). These new technologies have been integrated into the AP95 and will be transitioned to legitimate users as the AP98. To make the AP98 more user friendly, an upgraded pre- and post-processing, personal computer interface was also developed. Comparisons of the new theory have been made to both experimental data and the AP95. Comparisons of theory and experiment show the AP98 to be at least as good as the AP95 and, in general, maybe slightly better. In general, average accuracy levels of aerodynamics are +/- 10 percent on axial and normal force and +/- 4 percent of body length on center of pressure. For nonaxisymmetric body cases, accuracy can be slightly higher than these numbers, although not enough cases have been considered to make a definitive assessment. While these accuracy levels are encouraging for a semiempirical code, they could be improved upon by use of computational fluid dynamics codes or additional experimental data or both to reduce errors due to limited data bases.
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.
Extension Of The Nswcdd Aeroprediction Code To The Roll Position Of 45 Degrees
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Author : Frank Moore
language : en
Publisher:
Release Date : 1995
Extension Of The Nswcdd Aeroprediction Code To The Roll Position Of 45 Degrees written by Frank Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aerodynamics categories.
Nonlinear Structural Load Distribution Methodology For The Aeroprediction Code
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Author : Roy Mitchell McInville
language : en
Publisher:
Release Date : 1996
Nonlinear Structural Load Distribution Methodology For The Aeroprediction Code written by Roy Mitchell McInville and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Guided missiles categories.
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.
Technical Digest
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Author : Naval Surface Warfare Center (U.S.). Dahlgren Division
language : en
Publisher:
Release Date : 1998
Technical Digest written by Naval Surface Warfare Center (U.S.). Dahlgren Division and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Naval research categories.
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.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
An Improved Method For Predicting Axial Force At High Angle Of Attack
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 1997
An Improved Method For Predicting Axial Force At High Angle Of Attack 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 1997 with Aerodynamic load categories.