Improvements In Pitch Damping For The Aeroprediction Code With Particular Emphasis On Flare Configurations PDF Download
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Author | : Frankie Gale Moore |
Publisher | : |
Total Pages | : 0 |
Release | : 2000 |
Genre | : Aerodynamics |
ISBN | : |
Download Improvements in Pitch Damping for the Aeroprediction Code with Particular Emphasis on Flare Configurations Book in PDF, ePub and Kindle
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).
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Total Pages | : 24 |
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Download Dossier constitué par des extraits de lettres de prêtres Book in PDF, ePub and Kindle
Author | : Frankie Gale Moore |
Publisher | : |
Total Pages | : 232 |
Release | : 2002 |
Genre | : Aerodynamics |
ISBN | : |
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 | : Jerry M. Allen |
Publisher | : |
Total Pages | : 314 |
Release | : 2001 |
Genre | : Aerodynamic measurements |
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Download Parametric Fin-body and Fin-plate Database for a Series of 12 Missile Fins Book in PDF, ePub and Kindle
A cooperative experimental investigation has been performed to obtain a systematic fin-body and fin-plate database for series of 12 missile fins. These data are intended to complement and extend the information contained in the Triservice missile project and to provide a systematic set of experimental data from which fin-body interference factors can be derived. Data were obtained with the fins mounted on both an axisymmetric body and on a flat plate that was used to simulate fin-alone measurements. The experiments were conducted at Mach numbers from 0.60 to 3.95; fin deflection angles of 0°, 10° , and -10° ; and angles of attack up to 30° on the body and up to 95° on the flat plate. The data were obtained from three-component balances attached to the fins and a six-component balance located in the axisymmetric body. The data obtained in this project are documented in tabular form in this report. In addition, selected data are presented in graphical form to illustrate the effects of the test variables.
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Total Pages | : 135 |
Release | : 2008 |
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Download The 2009 Version of the Aeroprediction Code: The AP09 Book in PDF, ePub and Kindle
The AP05 code was evaluated when applied to configurations with boattails. Results of the evaluation indicated the AP05 predictions for normal force, center of pressure, pitch and roll damping moments needed improvement. As a result new and improved methods were developed and incorporated into the AP05 to be released as the AP09. Improvements include body alone lift characteristics for Mach numbers less than 2, low angle of attack improvements for roll and pitch damping for configurations with long boattails, incorporation of an improved boundary layer displacement model and refinement of several other existing methods. In addition, new methods were developed to predict nonlinear roll and pitch damping. Comparing the new and improved methods to existing experimental data indicated significant improvements in roll and pitch damping, normal force and center of pressure predictions compared to the AP05. However, validation of the AP09 code was not as complete as desired due to limited generic nonlinear roll and pitch damping data. Also, most of the available nonlinear dynamic derivative data has larger than desired accuracy boundaries due to model sting and wind tunnel wall interference issues. Weapons affected most by the new AP09 methodology are mortars, low drag bombs and projectiles in that order. However, the nonlinear dynamic derivative predictions affect all weapons. The AP09 is thus the most accurate and robust of the Aeroprediction Codes to date.
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Total Pages | : 826 |
Release | : 2001 |
Genre | : Aeronautics |
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Download 39th AIAA Aerospace Sciences Meeting and Exhibit Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 494 |
Release | : 1982 |
Genre | : Aeronautics |
ISBN | : |
Download AIAA 82-0250 - AIAA 82-0300 Book in PDF, ePub and Kindle
Author | : Naval Surface Weapons Center |
Publisher | : |
Total Pages | : 68 |
Release | : 1979 |
Genre | : Naval research |
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Download NSWC TR. Book in PDF, ePub and Kindle
Author | : Bernd Chudoba |
Publisher | : Springer |
Total Pages | : 392 |
Release | : 2019-07-23 |
Genre | : Technology & Engineering |
ISBN | : 3030168565 |
Download Stability and Control of Conventional and Unconventional Aerospace Vehicle Configurations Book in PDF, ePub and Kindle
This book introduces a stability and control methodology named AeroMech, capable of sizing the primary control effectors of fixed wing subsonic to hypersonic designs of conventional and unconventional configuration layout. Control power demands are harmonized with static-, dynamic-, and maneuver stability requirements, while taking the six-degree-of-freedom trim state into account. The stability and control analysis solves the static- and dynamic equations of motion combined with non-linear vortex lattice aerodynamics for analysis. The true complexity of addressing subsonic to hypersonic vehicle stability and control during the conceptual design phase is hidden in the objective to develop a generic (vehicle configuration independent) methodology concept. The inclusion of geometrically asymmetric aircraft layouts, in addition to the reasonably well-known symmetric aircraft types, contributes significantly to the overall technical complexity and level of abstraction. The first three chapters describe the preparatory work invested along with the research strategy devised, thereby placing strong emphasis on systematic and thorough knowledge utilization. The engineering-scientific method itself is derived throughout the second half of the book. This book offers a unique aerospace vehicle configuration independent (generic) methodology and mathematical algorithm. The approach satisfies the initial technical quest: How to develop a ‘configuration stability & control’ methodology module for an advanced multi-disciplinary aerospace vehicle design synthesis environment that permits consistent aerospace vehicle design evaluations?
Author | : Jack Norman Nielsen |
Publisher | : AIAA (American Institute of Aeronautics & Astronautics) |
Total Pages | : 450 |
Release | : 1988-01-01 |
Genre | : Guided missiles |
ISBN | : 9780962062902 |
Download Missile Aerodynamics Book in PDF, ePub and Kindle
The similarities between the airplane and the missile extend beyond their flying capabilities, and at higher operational speeds, the configuration distinctions become even less apparent. " Missile Aerodynamics," a classic now available from AIAA and Nielsen Engineering and Research, Inc., combines the best of missile and airplane aerodynamics, drawing extensively from numerous technical papers to present a rational and unified account of the principles behind missile projection. Evaluate the missile versus the airplane in a multitude of areas, from longitudinal acceleration, wing loading, roll and dynamic stability, guidance and navigation, and more. J.N. Nielsen covers every aspect of missile aerodynamics, from the classification of missiles and basic formulas to innovative aerodynamic controls. In one reliable reference, readers will find hundreds of schematics, equations, and tables with practical applications in missile design and engineering. Originally published by Nielsen Engineering and Research, Inc.