The 1995 Version Of The Nswc Aeroprediction Code PDF Download
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Total Pages | : 0 |
Release | : 1995 |
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Download The 1995 Version of the NSWC Aeroprediction Code: Part 1. Summary of New Theoretical Methodology Book in PDF, ePub and Kindle
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 applied 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 + or - 10 percent could be obtained for axial and normal force coefficient and + or - 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 on the AP95 methodology could be made by additional missile-component wind-tunnel data at high AOA.
Author | : Frankie Gale Moore |
Publisher | : |
Total Pages | : 114 |
Release | : 1995 |
Genre | : Angle of attack (Aerodynamics). |
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Download The 1995 Version of the NSWC Aeroprediction Code Book in PDF, ePub and Kindle
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.
Author | : Frankie Gale Moore |
Publisher | : |
Total Pages | : 232 |
Release | : 2002 |
Genre | : Aerodynamics |
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Download The 2002 Version of the Aeroprediction Code Book in PDF, ePub and Kindle
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.
Author | : Frank Moore |
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Total Pages | : 158 |
Release | : 1995 |
Genre | : Aerodynamics |
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Download Extension of the NSWCDD Aeroprediction Code to the Roll Position of 45 Degrees Book in PDF, ePub and Kindle
Author | : Naval Surface Warfare Center (U.S.). Dahlgren Division |
Publisher | : |
Total Pages | : 180 |
Release | : 1998 |
Genre | : Naval research |
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Download Technical Digest Book in PDF, ePub and Kindle
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Total Pages | : 456 |
Release | : 1995 |
Genre | : Aeronautics |
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Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author | : Frankie Gale Moore |
Publisher | : |
Total Pages | : 148 |
Release | : 1997 |
Genre | : Aerodynamics |
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Download An Improved Semiempirical Method for Calculating Aerodynamics of Missiles with Noncircular Bodies Book in PDF, ePub and Kindle
Author | : Frankie Gale Moore |
Publisher | : AIAA (American Institute of Aeronautics & Astronautics) |
Total Pages | : 488 |
Release | : 2000 |
Genre | : History |
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Download Approximate Methods for Weapon Aerodynamics Book in PDF, ePub and Kindle
Moore brings 30 years of experience in weapons development to help bridge the gap between the academic textbook and practical application. The book reviews all approaches to calculate aerodynamics, allowing engineers to see the pros and cons of each approach, setting the stage for a semiempirical approach. It contains many approximate aerodynamic methods, bringing together in a single text both linearized and nonlinear aerodynamic methods. Practicing engineers will value the books emphasis on understanding the physics involved, understanding the assumptions made to get to the approximate approaches, and showing final equations used in the solution process.
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Total Pages | : 470 |
Release | : 1995 |
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Download Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography (supplement 325) Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : 678 |
Release | : 1998 |
Genre | : Aeronautics |
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Download 36th Aerospace Sciences Meeting & Exhibit Book in PDF, ePub and Kindle