Tradeoffs Among Weapon Aerodynamic Stability, Trajectory Perturbations, and F-4 Aircraft Performance PDF Download
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Author: John L. Holmberg
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
A series of three wind tunnel tests was conducted to determine the tradeoffs and interdependencies among weapon free stream aerodynamic characteristics, delivery aircraft performance degradation, and weapon separation trajectory perturbations. The weapon configurations tested were composed of one of three nose fairings, one of four tail assemblies, and the 800 pound general purpose warhead proposed for the Modular Weapon Series of munitions. The performance degradation was evaluated, using data from a 5% scale model of the F-4C aircraft carrying 11 weapons on inboard triple ejector racks and on a centerline multiple ejector rack, with 370 gallon fuel tanks outboard. Captive trajectories were initiated from all three positions on an inboard triple ejector rack of the F-4C model to determine the effects of nose and tail geometry on initial weapon perturbations. Limited flight test and analytically predicted trajectory data were also collected and compared to the wind tunnel results. In each wind tunnel test, data were recorded over a range of Mach numbers from 0.6 to 1.2 with Reynolds numbers on the order of 2 to 5 million per foot. Results of these tests revealed that relatively large differences in weapon free stream aerodynamic characteristics had little effect on delivery aircraft performance. The proper selection of weapon configuration did reduce perturbations in separation trajectories. However, the mutual aerodynamic interference resulting from carrrying weapons in close proximity to one another and the effects of Mach number on the strength of that interference were found to be of much greater significance than variations in the weapon geometries investigated. (Author).
Author: John L. Holmberg
Publisher:
ISBN:
Category :
Languages : en
Pages : 51
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Book Description
A series of three wind tunnel tests was conducted to determine the tradeoffs and interdependencies among weapon free stream aerodynamic characteristics, delivery aircraft performance degradation, and weapon separation trajectory perturbations. The weapon configurations tested were composed of one of three nose fairings, one of four tail assemblies, and the 800 pound general purpose warhead proposed for the Modular Weapon Series of munitions. The performance degradation was evaluated, using data from a 5% scale model of the F-4C aircraft carrying 11 weapons on inboard triple ejector racks and on a centerline multiple ejector rack, with 370 gallon fuel tanks outboard. Captive trajectories were initiated from all three positions on an inboard triple ejector rack of the F-4C model to determine the effects of nose and tail geometry on initial weapon perturbations. Limited flight test and analytically predicted trajectory data were also collected and compared to the wind tunnel results. In each wind tunnel test, data were recorded over a range of Mach numbers from 0.6 to 1.2 with Reynolds numbers on the order of 2 to 5 million per foot. Results of these tests revealed that relatively large differences in weapon free stream aerodynamic characteristics had little effect on delivery aircraft performance. The proper selection of weapon configuration did reduce perturbations in separation trajectories. However, the mutual aerodynamic interference resulting from carrrying weapons in close proximity to one another and the effects of Mach number on the strength of that interference were found to be of much greater significance than variations in the weapon geometries investigated. (Author).
Author: Robert C. Nelson
Publisher: WCB/McGraw-Hill
ISBN: 9780071158381
Category : Aerodynamique / Aeronautique / Aerospatial / Automatique / Avion / Commande / Conception / Controle / Navigation / Stabilite
Languages : en
Pages : 441
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Book Description
The second edition of Flight Stability and Automatic Control presents an organized introduction to the useful and relevant topics necessary for a flight stability and controls course. Not only is this text presented at the appropriate mathematical level, it also features standard terminology and nomenclature, along with expanded coverage of classical control theory, autopilot designs, and modern control theory. Through the use of extensive examples, problems, and historical notes, author Robert Nelson develops a concise and vital text for aircraft flight stability and control or flight dynamics courses.
Author: United States. Army Materiel Command
Publisher:
ISBN:
Category : Projectiles
Languages : en
Pages : 148
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 978
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Book Description
Author: John David Anderson
Publisher: McGraw-Hill Science, Engineering & Mathematics
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 602
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Book Description
Balancing technical material with important historical aspects of the invention and design of aeroplanes, this book develops aircraft performance techniques from first principles and applies them to real aeroplanes.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 624
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Book Description
Author: Edward Seckel
Publisher:
ISBN:
Category : Stability of airplanes
Languages : en
Pages : 532
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Book Description
Stability and Control of Airplanes and Helicopters deals with aircraft flying qualities that determine the stability and control of airplanes and helicopters. It includes problems based on real aircraft, selected to represent the gamut from simple to complicated, and from conventional utility designs to futuristic research types. Many of these problems involve comparison of theory and experiment to demonstrate their mutual relationship.
Author: Karl Johan Åström
Publisher: Princeton University Press
ISBN: 069121347X
Category : Technology & Engineering
Languages : en
Pages :
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Book Description
The essential introduction to the principles and applications of feedback systems—now fully revised and expanded This textbook covers the mathematics needed to model, analyze, and design feedback systems. Now more user-friendly than ever, this revised and expanded edition of Feedback Systems is a one-volume resource for students and researchers in mathematics and engineering. It has applications across a range of disciplines that utilize feedback in physical, biological, information, and economic systems. Karl Åström and Richard Murray use techniques from physics, computer science, and operations research to introduce control-oriented modeling. They begin with state space tools for analysis and design, including stability of solutions, Lyapunov functions, reachability, state feedback observability, and estimators. The matrix exponential plays a central role in the analysis of linear control systems, allowing a concise development of many of the key concepts for this class of models. Åström and Murray then develop and explain tools in the frequency domain, including transfer functions, Nyquist analysis, PID control, frequency domain design, and robustness. Features a new chapter on design principles and tools, illustrating the types of problems that can be solved using feedback Includes a new chapter on fundamental limits and new material on the Routh-Hurwitz criterion and root locus plots Provides exercises at the end of every chapter Comes with an electronic solutions manual An ideal textbook for undergraduate and graduate students Indispensable for researchers seeking a self-contained resource on control theory
Author: Robert Preston
Publisher: Rand Corporation
ISBN: 0833032526
Category : Technology & Engineering
Languages : en
Pages : 231
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Book Description
This overview aims to inform the public discussion of space-based weapons by examining their characteristics, potential attributes, limitations, legality, and utility. The authors do not argue for or against space weapons, nor do they estimate the potential costs and performance of specific programs, but instead sort through the realities and myths surrounding space weapons in order to ensure that debates and discussions are based on fact.
Author: Douglas A. Joyce
Publisher:
ISBN: 9781626830196
Category : Research aircraft
Languages : en
Pages : 409
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Book Description
The X-31 Enhanced Fighter Maneuverability Demonstrator was unique among experimental aircraft. A joint effort of the United States and Germany, the X-31 was the only X-plane to be designed, manufactured, and flight tested as an international collaboration. It was also the only X-plane to support two separate test programs conducted years apart, one administered largely by NASA and the other by the U.S. Navy, as well as the first X-plane ever to perform at the Paris Air Show. Flying Beyond the Stall begins by describing the government agencies and private-sector industries involved in the X-31 program, the genesis of the supermaneuverability concept and its initial design breakthroughs, design and fabrication of two test airframes, preparation for the X-31's first flight, and the first flights of Ship #1 and Ship #2. Subsequent chapters discuss envelope expansion, handling qualities (especially at high angles of attack), and flight with vectored thrust. The book then turns to the program's move to NASA's Dryden Flight Research Center and actual flight test data. Additional tasking, such as helmet-mounted display evaluations, handling quality studies, aerodynamic parameter estimation, and a "tailless" study are also discussed.The book describes how, in the aftermath of a disastrous accident with Ship #1 in 1995, Ship #2 was prepared for its outstanding participation in the Paris Air Show. The aircraft was then shipped back to Edwards AFB and put into storage until the late 1990s, when it was refurbished for participation in the U. S. Navy's VECTOR program. The book ends with a comprehensive discussion of lessons learned and includes an Appendix containing detailed information.
