New Methods For Predicting Nonlinear Lift Center Of Pressure And Pitching Moment On Middile Configurations
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New Methods For Predicting Nonlinear Lift Center Of Pressure And Pitching Moment On Middile Configurations
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 1992
New Methods For Predicting Nonlinear Lift Center Of Pressure And Pitching Moment On Middile 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 1992 with Angle of attack (Aerodynamics). categories.
A new semiempirical method has been developed to predict normal force, pitching moment, and center of pressure on missile configurations up to angles of attack of 30° The method is based on linear theory and slender body techniques at low angle of attack and uses wind tunnel data to derive nonlinear angle-of-attack corrections as angle of attack increaces. The new improved theories include body alone, wing alone, and body-wing and wing-body interference. While the new theory is databased, simple analytical formulas are derived that allow general use of the techniques. Comparison with the linearized approaches used in the former NSWCDD aeroprediction code shows singificant reductions in errors of aerodynamics above 5° to 10° angle of attack. Limited comparisons to other state-of-the-art engineering codes show the new theory to be as good as or better than anything known to be available for computing planar aerodynamics up to 30° angle of attack.
State Of The Art Engineering Aeroprediction Methods With Emphasis On New Semiempirical Techniques For Predicting Nonlinear Aerodynamics On Complete Missile Configurations
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 1993
State Of The Art Engineering Aeroprediction Methods With Emphasis On New Semiempirical Techniques For Predicting Nonlinear Aerodynamics On Complete Missile 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 1993 with Aerodynamics categories.
This report discusses the pros and cons of numerical, semiempirical and empirical aeroprediction codes and lists many state-of-the-art codes in use today. It then summarizes many of the more popular approximate analytical methods used in State-of-the-Art (SOTA) semiempirical aeroprediction codes. It also summarizes some recent new nonlinear semiempirical methods that allow more accurate calculation of static aerodynamics on complete missile configurations to higher angles of attack. Results of static aerodynamic calculations on complete missile configurations compared to wind tunnel data are shown for several configurations at various flight conditions. Calculations show the new nonlinear methods being far superior to some of the former linear technology when used at angles of attack greater than about 15 degrees. Aeroprediction codes, Nonlinear semiempirical methods, State-of-the-Art (SOTA) semiempirical aeroprediction codes, Static aerodynamic calculations.
Improved Aeroprediction Code
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Author : Frankie Gale Moore
language : en
Publisher:
Release Date : 1993
Improved 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 1993 with Aerodynamic heating categories.
New and improved version of the Naval Surface Warfare Center, Dahlgren Division aeroprediction code (AP93) has been developed. The new code contains new technology that allows planar aerodynamics of axisymmetric solid rocket-type weapons to be computed with engineering accurately over the entire Mach number range and for angles of attack to 30 deg. New technology developed and included in the AP93 includes; A new engineering method to compute aeroheating information at a high Mach number; Extension of the second-order shock-expansion theory to include real-gas effects, including several new pressure prediction techniques; An improved body-alone nonlinear normal-force method; New methods for computing nonlinear aerodynamics of wing alone, wing body, and body wing due to angle of attack, and wing body due to control deflection; and a new base-dmg database and improved empirical base-drag estimation technique. ... Aeroprediction code (AP93), Planar aerodynamics, High mach number.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995-08
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 1995-08 with Aeronautics 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.
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.
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.
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.
Agard Report
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Author :
language : en
Publisher:
Release Date : 1994
Agard Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.