Computer Techniques for the Rapid Flutter Clearance of Aircraft Carrying External Stores. Part I. Perturbation Theory and Applications

Computer Techniques for the Rapid Flutter Clearance of Aircraft Carrying External Stores. Part I. Perturbation Theory and Applications

Author: A. K. Cross

Publisher:

Published: 1973

Total Pages: 85

ISBN-13:

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A method for rapid flutter clearance of aircraft is developed and is demonstrated in Part I of this report. The analytical perturbation procedures are mechanized by means of a data retrieval system and computer program documented in a separate cover in Part II of the report. The demonstration studies were conducted for the production F-5 aircraft using perturbations covering a range of external stores representative of the major part of the USAF stores inventory. The perturbation flutter program has been used for typical production applications with resulting execution speeds of 1000 analyses per hour. The perturbation method produced execution time savings of approximately 90% for the IBM 370/165 central processor employed in the demonstration studies. Comparable savings are expected for other large processors such as the CDC 6600 and 7600. Significantly larger time savings are expected for problems involving more sophisticated finite element models. Flutter boundaries were compared by both the perturbation method and the conventional methods. Comparisons show satisfactory agreement for most design purposes. In many cases involving moderate perturbations, different branches of a stability boundary were reached from a single baseline case with extreme accuracy. Perturbations involving changes of up to 300% in store inertias were studied. The method has the capability to screen many configurations rapidly and to identify significant problem areas for detailed study.


AGARD Advisory Report

AGARD Advisory Report

Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development

Publisher:

Published: 1983

Total Pages: 36

ISBN-13:

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Flying beyond the stall

Flying beyond the stall

Author: Douglas A. Joyce

Publisher:

Published: 2014

Total Pages: 409

ISBN-13: 9781626830196

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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.


Handbook of Dynamic Data Driven Applications Systems

Handbook of Dynamic Data Driven Applications Systems

Author: Frederica Darema

Publisher: Springer Nature

Published: 2023-10-16

Total Pages: 937

ISBN-13: 3031279867

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This Second Volume in the series Handbook of Dynamic Data Driven Applications Systems (DDDAS) expands the scope of the methods and the application areas presented in the first Volume and aims to provide additional and extended content of the increasing set of science and engineering advances for new capabilities enabled through DDDAS. The methods and examples of breakthroughs presented in the book series capture the DDDAS paradigm and its scientific and technological impact and benefits. The DDDAS paradigm and the ensuing DDDAS-based frameworks for systems’ analysis and design have been shown to engender new and advanced capabilities for understanding, analysis, and management of engineered, natural, and societal systems (“applications systems”), and for the commensurate wide set of scientific and engineering fields and applications, as well as foundational areas. The DDDAS book series aims to be a reference source of many of the important research and development efforts conducted under the rubric of DDDAS, and to also inspire the broader communities of researchers and developers about the potential in their respective areas of interest, of the application and the exploitation of the DDDAS paradigm and the ensuing frameworks, through the examples and case studies presented, either within their own field or other fields of study. As in the first volume, the chapters in this book reflect research work conducted over the years starting in the 1990’s to the present. Here, the theory and application content are considered for: Foundational Methods Materials Systems Structural Systems Energy Systems Environmental Systems: Domain Assessment & Adverse Conditions/Wildfires Surveillance Systems Space Awareness Systems Healthcare Systems Decision Support Systems Cyber Security Systems Design of Computer Systems The readers of this book series will benefit from DDDAS theory advances such as object estimation, information fusion, and sensor management. The increased interest in Artificial Intelligence (AI), Machine Learning and Neural Networks (NN) provides opportunities for DDDAS-based methods to show the key role DDDAS plays in enabling AI capabilities; address challenges that ML-alone does not, and also show how ML in combination with DDDAS-based methods can deliver the advanced capabilities sought; likewise, infusion of DDDAS-like approaches in NN-methods strengthens such methods. Moreover, the “DDDAS-based Digital Twin” or “Dynamic Digital Twin”, goes beyond the traditional DT notion where the model and the physical system are viewed side-by-side in a static way, to a paradigm where the model dynamically interacts with the physical system through its instrumentation, (per the DDDAS feed-back control loop between model and instrumentation).


Commercial Aviation Safety, Sixth Edition

Commercial Aviation Safety, Sixth Edition

Author: Stephen K. Cusick

Publisher: McGraw Hill Professional

Published: 2017-05-12

Total Pages: 561

ISBN-13: 125964183X

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Up-To-Date Coverage of Every Aspect of Commercial Aviation Safety Completely revised edition to fully align with current U.S. and international regulations, this hands-on resource clearly explains the principles and practices of commercial aviation safety—from accident investigations to Safety Management Systems. Commercial Aviation Safety, Sixth Edition, delivers authoritative information on today's risk management on the ground and in the air. The book offers the latest procedures, flight technologies, and accident statistics. You will learn about new and evolving challenges, such as lasers, drones (unmanned aerial vehicles), cyberattacks, aircraft icing, and software bugs. Chapter outlines, review questions, and real-world incident examples are featured throughout. Coverage includes: • ICAO, FAA, EPA, TSA, and OSHA regulations • NTSB and ICAO accident investigation processes • Recording and reporting of safety data • U.S. and international aviation accident statistics • Accident causation models • The Human Factors Analysis and Classification System (HFACS) • Crew Resource Management (CRM) and Threat and Error Management (TEM) • Aviation Safety Reporting System (ASRS) and Flight Data Monitoring (FDM) • Aircraft and air traffic control technologies and safety systems • Airport safety, including runway incursions • Aviation security, including the threats of intentional harm and terrorism • International and U.S. Aviation Safety Management Systems