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Author : Allan Yeow-Nam Lee
Publisher :
ISBN 13 :
Total Pages : 664 pages
Book Rating : 4.:/5 (317 download)
Download or read book Optimal Landing of a Helicopter in Autorotation written by Allan Yeow-Nam Lee and published by . This book was released on 1985 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zachary Nolan Sunberg
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.:/5 (868 download)
Download or read book A Real Time Expert Control System for Helicopter Autorotation written by Zachary Nolan Sunberg and published by . This book was released on 2013 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Autorotation maneuvers are required to perform a safe landing of a helicopter in cases of engine loss in a single engine vehicle and transmission or tail rotor malfunction. The rise of autonomous helicopter technology, and the pilot skill required to manually perform an autorotation, motivate the need for new autonomous autorotation control laws. Previous approaches to automatic control for this maneuver have relied on control law optimization based on a high-fidelity model of the helicopter, or have attempted to match recorded trajectories flown by an expert human pilot. In this paper, a new expert control system is proposed. The term "expert control system" is used because the system is intended to mimic the actions that a human pilot might take, does not require any iterative learning, model prediction, or optimization at runtime, and is based on an inference system that involves fuzzy logic, PID, and other conventional control techniques. The multi-stage control law drives the helicopter to a near-optimal steady-state descent and uses an estimate of the time to impact to safely flare and land the helicopter in the vast majority of flight conditions. The control law is validated using a full 6-degree-of-freedom simulation of both a full-size attack helicopter and a small hobby-class helicopter. The proposed control design is highly flexible and may be used to perform fully autonomous autorotation or to provide guidance to pilots during manual autorotation maneuvers. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/149553
Author : Andrew B. Connor
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (31 download)
Download or read book Helicopter-engine Acceleration-time Requirements Based on Pilot Demand During Recovery from Landing Flareouts written by Andrew B. Connor and published by . This book was released on 1960 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wayne Johnson
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.:/5 (317 download)
Download or read book Helicopter Optimal Descent and Landing After Power Loss written by Wayne Johnson and published by . This book was released on 1977 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Shawn Coyle
Publisher :
ISBN 13 : 9780979263842
Total Pages : 0 pages
Book Rating : 4.2/5 (638 download)
Download or read book LIttle Book of Autorotations (print) written by Shawn Coyle and published by . This book was released on 2013-02-26 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book to cover exclusively landing a helicopter without engine power. From basics to advanced techniques, for beginner to flight instructor. Covers why not to practice engine-off landings on grass.
Author : Antonio Filippone
Publisher : Elsevier
ISBN 13 : 0080461034
Total Pages : 594 pages
Book Rating : 4.0/5 (84 download)
Download or read book Flight Performance of Fixed and Rotary Wing Aircraft written by Antonio Filippone and published by Elsevier. This book was released on 2006-05-10 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calculation and optimisation of flight performance is required to design or select new aircraft, efficiently operate existing aircraft, and upgrade aircraft. It provides critical data for aircraft certification, accident investigation, fleet management, flight regulations and safety. This book presents an unrivalled range of advanced flight performance models for both transport and military aircraft, including the unconventional ends of the envelopes. Topics covered include the numerical solution of supersonic acceleration, transient roll, optimal climb of propeller aircraft, propeller performance, long-range flight with en-route stop, fuel planning, zero-gravity flight in the atmosphere, VSTOL operations, ski jump from aircraft carrier, optimal flight paths at subsonic and supersonic speed, range-payload analysis of fixed- and rotary wing aircraft, performance of tandem helicopters, lower-bound noise estimation, sonic boom, and more.This book will be a valuable text for undergraduate and post-graduate level students of aerospace engineering. It will also be an essential reference and resource for practicing aircraft engineers, aircraft operations managers and organizations handling air traffic control, flight and flying regulations, standards, safety, environment, and the complex financial aspects of flying aircraft. - Unique coverage of fixed and rotary wing aircraft in a unified manner, including optimisation, emissions control and regulation. - Ideal for students, aeronautical engineering capstone projects, and for widespread professional reference in the aerospace industry. - Comprehensive coverage of computer-based solution of aerospace engineering problems; the critical analysis of performance data; and case studies from real world engineering experience. - Supported by end of chapter exercises
Author : Thanan Yomchinda
Publisher :
ISBN 13 :
Total Pages : 186 pages
Book Rating : 4.:/5 (859 download)
Download or read book Real-time Path Planning and Autonomous Control for Helicopter Autorotation written by Thanan Yomchinda and published by . This book was released on 2013 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 960 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1986 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Ali A. Jhemi
Publisher :
ISBN 13 :
Total Pages : 276 pages
Book Rating : 4.:/5 (319 download)
Download or read book Optimal Flight of a Helicopter in Engine Failure written by Ali A. Jhemi and published by . This book was released on 1999 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781724982117
Total Pages : 34 pages
Book Rating : 4.9/5 (821 download)
Download or read book Helicopter Optimal Descent and Landing After Power Loss written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-09 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: An optimal control solution is obtained for the descent and landing of a helicopter after the loss of power in level flight. The model considers the helicopter vertical velocity, horizontal velocity, and rotor speed; and it includes representations of ground effect, rotor inflow time lag, pilot reaction time, rotor stall, and the induced velocity curve in the vortex ring state. The control (rotor thrust magnitude and direction) required to minimize the vertical and horizontal velocity at contact with the ground is obtained using nonlinear optimal control theory. It is found that the optimal descent after power loss in hover is a purely vertical flight path. Good correlation, even quantitatively, is found between the calculations and (non-optimal) flight test results. Johnson, W. Ames Research Center NASA-TM-X-73244, A-7047 RTOP 505-10-22...
Author : Vivek Sharma
Publisher :
ISBN 13 :
Total Pages : 412 pages
Book Rating : 4.:/5 (319 download)
Download or read book Optimal Helicopter Operation from a Clear Heliport in the Event of One Engine Failure written by Vivek Sharma and published by . This book was released on 1994 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert J. Pegg
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (31 download)
Download or read book A Flight Investigation of a Lightweight Helicopter to Study the Feasbility of Fixed-collective-pitch Autorotations written by Robert J. Pegg and published by . This book was released on 1969 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight investigation of lightweight helicopter to study feasibility of fixed collective pitch autorotations.
Author :
Publisher :
ISBN 13 :
Total Pages : 702 pages
Book Rating : 4.:/5 (31 download)
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1988 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kimon P. Valavanis
Publisher : Springer Science & Business Media
ISBN 13 : 9048187648
Total Pages : 519 pages
Book Rating : 4.0/5 (481 download)
Download or read book Selected papers from the 2nd International Symposium on UAVs, Reno, U.S.A. June 8-10, 2009 written by Kimon P. Valavanis and published by Springer Science & Business Media. This book was released on 2011-04-11 with total page 519 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decade, signi?cant changes have occurred in the ?eld of vehicle motion planning, and for UAVs in particular. UAV motion planning is especially dif?cult due to several complexities not considered by earlier planning strategies: the - creased importance of differential constraints, atmospheric turbulence which makes it impossible to follow a pre-computed plan precisely, uncertainty in the vehicle state, and limited knowledge about the environment due to limited sensor capabilities. These differences have motivated the increased use of feedback and other control engineering techniques for motion planning. The lack of exact algorithms for these problems and dif?culty inherent in characterizing approximation algorithms makes it impractical to determine algorithm time complexity, completeness, and even soundness. This gap has not yet been addressed by statistical characterization of experimental performance of algorithms and benchmarking. Because of this overall lack of knowledge, it is dif?cult to design a guidance system, let alone choose the algorithm. Throughout this paper we keep in mind some of the general characteristics and requirements pertaining to UAVs. A UAV is typically modeled as having velocity and acceleration constraints (and potentially the higher-order differential constraints associated with the equations of motion), and the objective is to guide the vehicle towards a goal through an obstacle ?eld. A UAV guidance problem is typically characterized by a three-dimensional problem space, limited information about the environment, on-board sensors with limited range, speed and acceleration constraints, and uncertainty in vehicle state and sensor data.
Author : William A Pleasants (III.)
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (227 download)
Download or read book Status of Improved Autorotative Landing Capability Research written by William A Pleasants (III.) and published by . This book was released on 1980 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: While the frequency of all emergency autorotative landings (i.e., rate per 100,000 flight hours) has decreased over the past several years for Army single-engine fleet helicopters, the percentage of unsuccessful landings resulting from emergency autorotations has remained relatively high. United States Army Safety Center accident statistics reveal that at least 30 percent of all emergency autorotative landings involving AH-1, UH-1, OH-58, and OH-6A helicopters result in some degree of vehicle damage or personnel injury. These statistics further indicate that the probability of each of these helicopters experiencing at least one emergency autorotation accident during an assumed 10,000-hour service life is as follows: OH-6(94.0%), AH-1(77.5%), OH-58(76.3%), and UH-1(63.3%). Recent design studies and supplementary research of previously documented findings indicate that it is possible to significantly improve helicopter autorotation capability and reduce demands on pilot skill through helicopter rotor energy augmenting concepts. This paper discusses results of current studies as well as an outline for future in-depth research.
Author : Eric Bernard Carlson
Publisher :
ISBN 13 :
Total Pages : 432 pages
Book Rating : 4.:/5 (319 download)
Download or read book Optimal Tiltrotor Aircraft Operations During Power Failure written by Eric Bernard Carlson and published by . This book was released on 1999 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kenzo Nonami
Publisher : Springer Science & Business Media
ISBN 13 : 4431538569
Total Pages : 341 pages
Book Rating : 4.4/5 (315 download)
Download or read book Autonomous Flying Robots written by Kenzo Nonami and published by Springer Science & Business Media. This book was released on 2010-09-15 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advance in robotics has boosted the application of autonomous vehicles to perform tedious and risky tasks or to be cost-effective substitutes for their - man counterparts. Based on their working environment, a rough classi cation of the autonomous vehicles would include unmanned aerial vehicles (UAVs), - manned ground vehicles (UGVs), autonomous underwater vehicles (AUVs), and autonomous surface vehicles (ASVs). UAVs, UGVs, AUVs, and ASVs are called UVs (unmanned vehicles) nowadays. In recent decades, the development of - manned autonomous vehicles have been of great interest, and different kinds of autonomous vehicles have been studied and developed all over the world. In part- ular, UAVs have many applications in emergency situations; humans often cannot come close to a dangerous natural disaster such as an earthquake, a ood, an active volcano, or a nuclear disaster. Since the development of the rst UAVs, research efforts have been focused on military applications. Recently, however, demand has arisen for UAVs such as aero-robotsand ying robotsthat can be used in emergency situations and in industrial applications. Among the wide variety of UAVs that have been developed, small-scale HUAVs (helicopter-based UAVs) have the ability to take off and land vertically as well as the ability to cruise in ight, but their most importantcapability is hovering. Hoveringat a point enables us to make more eff- tive observations of a target. Furthermore, small-scale HUAVs offer the advantages of low cost and easy operation.
