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Helicopter Accuracy Study
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Book Synopsis Impact of Prediction Accuracy on Costs - Noise Technology Applications in Helicopters by : R. H. Spencer
Download or read book Impact of Prediction Accuracy on Costs - Noise Technology Applications in Helicopters written by R. H. Spencer and published by . This book was released on 1981 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is an extension of the work reported in AD-A083 935, and considers the effect which uncertainties in the prediction and measurement of helicopter noise have on the development and operating costs. Although the number of helicopters studied is too small to permit generally applicable conclusions, the following are the primary results: (1) the Effective Perceived Noise (EPN) Levels tended to be overpredicted for takeoffs, underpredicted for approaches, with no general trend noted for level flyovers; (2) prediction accuracy for the cases studied ranged from 1 to 6 EPNdB; and (3) test and measurement repeatability can give a range of up to 3 EPNdB. Each helicopter must be studied as an individual case and generalization of cost trends should be avoided.
Book Synopsis HELICOPTER ACCURACY STUDY. by : A. H. LARIVIERE
Download or read book HELICOPTER ACCURACY STUDY. written by A. H. LARIVIERE and published by . This book was released on 1962 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: The accuracy of the XM153 (Quad) armament subsystem was determined. Target acquisition and tracking capabilities of this subsystem were compared with those (results) presented in Emerson Electric Manufacturing Company, Report 1165. Basic accuracy of the 7.62mm M73 machine gun fired from the HU-1A helicopter equipped with the XM153 armament subsystem was determined. Also, basic accuracy of the 7.62mm M60 machine gun fired from the H-13H helicopter equipped with the XM2 armament subsystem was determined. Recommendations were made for improvement of the XM153 armament subsystem, and for future study and evaluation of the helicopter armament program. Test procedure is described and results discussed. (Author).
Book Synopsis Pilot Performance in a Helicopter Simulator by : John D. Waugh
Download or read book Pilot Performance in a Helicopter Simulator written by John D. Waugh and published by . This book was released on 1975 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Six Army helicopter pilots, instrument rated, flew a difficult precision instrument flight pattern in this Laboratory's GAT-2H helicopter simulator. For each flight, each subject was given a different combination of thrust to weight, cyclic control sensitivity and cyclic spring centering force gradient condition making up an incomplete, balanced block-type experimental design. Several error measurements were recorded during the trials; however, none could be satisfactorily utilized to predict either accuracy of performance, or be an indicator of relative workload. An unanticipated large variation of measures taken is thought to be the cause. Additional approaches and further study of the problem is recommended.
Book Synopsis An Analytically Linearized Helicopter Model with Improved Modeling Accuracy by : Patrick T. Jensen
Download or read book An Analytically Linearized Helicopter Model with Improved Modeling Accuracy written by Patrick T. Jensen and published by . This book was released on 1991 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design Analysis of Helicopter Automatic and Semiautomatic Airborne Precision Pointing and Tracking Systems by : William H. Boykin
Download or read book Design Analysis of Helicopter Automatic and Semiautomatic Airborne Precision Pointing and Tracking Systems written by William H. Boykin and published by . This book was released on 1974 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes the research conducted into the design analysis of helicopter mounted automatic and semi-automatic airborne laser designator systems. The design goals are high line-of-sight pointing accuracy and minimum weight with realistic hardware constraints.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722429447 Total Pages :60 pages Book Rating :4.4/5 (294 download)
Book Synopsis Helicopter Precision Approach Capability Using the Global Positioning System by : National Aeronautics and Space Administration (NASA)
Download or read book Helicopter Precision Approach Capability Using the Global Positioning System written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The period between 1 July and 31 December, 1992, was spent developing a research plan as well as a navigation system document and flight test plan to investigate helicopter precision approach capability using the Global Positioning System (GPS). In addition, all hardware and software required for the research was acquired, developed, installed, and verified on both the test aircraft and the ground-based reference station. Kaufmann, David N. Ames Research Center...
Book Synopsis Observations of Lightweight Doppler System Accuracy by : I. V. Lloyd
Download or read book Observations of Lightweight Doppler System Accuracy written by I. V. Lloyd and published by . This book was released on 1984 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Data on the accuracy of the Lightweight Doppler Navigation System (LDNS) fitted to a Royal Australia Air Force UH-1H helicopter were gathered as a by-product of an experiment on the TACTERM navigation system. The observed accuracy was found to be close to 1% of distance travelled, a figure generally considered to be representative of modern doppler navigation systems. The dominant source of LDNS position error was magnetic compass error which in turn appeared to be dominated by spatial and temporal variations in the local magnetical field.
Book Synopsis A Flying Qualities Study of a Small Ram Jet Helicopter by : Andrew B. Connor
Download or read book A Flying Qualities Study of a Small Ram Jet Helicopter written by Andrew B. Connor and published by . This book was released on 1960 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Comparison of Lifting-Line and CFD Methods with Flight Test Data from a Research Puma Helicopter by :
Download or read book A Comparison of Lifting-Line and CFD Methods with Flight Test Data from a Research Puma Helicopter written by and published by . This book was released on 1996 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four lifting-line methods were compared with flight test data from a research Puma helicopter and the accuracy assessed over a wide range of flight speeds. Hybrid CFD methods were also examined for two high-speed conditions. A parallel analytical effort was performed with the lifting-line methods to assess the effects of modeling assumptions and this provided insight into the adequacy of these methods for load predictions.
Book Synopsis Flow Environment Study Near the Empennage of a 15-Percent Scale Helicopter Model by : Susan Althoff Gorton
Download or read book Flow Environment Study Near the Empennage of a 15-Percent Scale Helicopter Model written by Susan Althoff Gorton and published by . This book was released on 2000 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of advanced rotorcraft configurations has highlighted a need for high-quality experimental data to support the development of flexible and accurate analytical design tools. To provide this type of data, a test program was conducted in the Langley 14- by 22-Foot Subsonic Tunnel to measure the flow near the empennage of a 15-percent scale powered helicopter model with an operating tail fan. Three-component velocity profiles were measured with laser velocimetry (LV) one chord forward of the horizontal tail for four advance ratios to evaluate the effect of the rotor wake impingement on the horizontal tail angle of attack. These velocity data indicate the horizontal tail can experience unsteady angle of attack variations of over 30 degress due to the rotor wake influence. The horizontal tail is most affected by the rotor wake above advance ratios of 0.10. Velocity measurements of the flow on the inlet side of the tail fan were made for a low-speed flight condition using conventional LV techniques. The velocity data show an accelerated flow near the tail fan duct, and vorticity calculations track the passage of main rotor wake vortices through the measurement plane.
Book Synopsis Flight Testing and Real-Time System Identification Analysis of a UH-60A Black Hawk Helicopter with an Instrumented External Sling Load by : Allen H. McCoy
Download or read book Flight Testing and Real-Time System Identification Analysis of a UH-60A Black Hawk Helicopter with an Instrumented External Sling Load written by Allen H. McCoy and published by . This book was released on 1997-12 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Historically, helicopter and load combinations have been qualified through flight testing, requiring considerable time and cost. With advancements in simulation and flight test techniques, there is potential to substantially reduce costs and increase the safety of helicopter sling load certification. Validated simulation tools make possible accurate prediction of operational flight characteristics before initial flight tests. Real time analysis of test data improves the safety and efficiency of the testing programs. To advance these concepts, the US Army and NASA, in cooperation with the Israeli Air Force and Technion, under a Memorandum of Agreement, seek to develop and validate a numerical model of the UH-60 with sling load and demonstrate a method of near real time flight test analysis. This thesis presents results from flight tests of a US Army Black Hawk helicopter with various external loads. Tests were conducted as the US first phase of this MOA task. The primary load was a container express box (CONEX), which contained a compact instrumentation package. The flights covered the airspeed range from hover to 70 knots. Primary maneuvers were pitch and roll frequency sweeps, steps, and doublets. Results of the test determined the effect of the suspended load on both the aircraft's handling qualities and it's control system's stability margins. Included were calculations of the stability characteristics of the load's pendular motion. Utilizing CIFER software, a method for near-real time system identification was also demonstrated during the flight test program.
Book Synopsis Calculation and Accuracy Investigation of Helicopter Derivaties from Open Source Information by : S. Camporeale
Download or read book Calculation and Accuracy Investigation of Helicopter Derivaties from Open Source Information written by S. Camporeale and published by . This book was released on 2007 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723496462 Total Pages :352 pages Book Rating :4.4/5 (964 download)
Book Synopsis A Comparison of Lifting-Line and Cfd Methods with Flight Test Data from a Research Puma Helicopter by : National Aeronautics and Space Administration (NASA)
Download or read book A Comparison of Lifting-Line and Cfd Methods with Flight Test Data from a Research Puma Helicopter written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Four lifting-line methods were compared with flight test data from a research Puma helicopter and the accuracy assessed over a wide range of flight speeds. Hybrid Computational Fluid Dynamics (CFD) methods were also examined for two high-speed conditions. A parallel analytical effort was performed with the lifting-line methods to assess the effects of modeling assumptions and this provided insight into the adequacy of these methods for load predictions. Bousman, William G. and Young, Colin and Toulmay, Francois and Gilbert, Neil E. and Strawn, Roger C. and Miller, Judith V. and Maier, Thomas H. and Costes, Michel and Beaumier, Philippe Ames Research Center NASA-TM-110421, NAS 1.15: 110421, A-962753, USAATCOM TR-96-A-008 RTOP 505-59-87...
Book Synopsis Helicopter Flight Dynamics by : Gareth D. Padfield
Download or read book Helicopter Flight Dynamics written by Gareth D. Padfield and published by John Wiley & Sons. This book was released on 2008-04-15 with total page 681 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behaviour of helicopters is so complex that understanding the physical mechanisms at work in trim, stability and response, and thus the prediction of Flying Qualities, requires a framework of analytical and numerical modelling and simulation. Good Flying Qualities are vital for ensuring that mission performance is achievable with safety and, in the first edition of Helicopter Flight Dynamics, a comprehensive treatment of design criteria was presented. In this second edition, the author complements this with a new Chapter on Degraded Flying Qualities, drawing examples from flight in poor visibility, failure of control functions and encounters with severe atmospheric disturbances. Fully embracing the consequences of Degraded Flying Qualities during the design phase will contribute positively to safety. The accurate prediction and assessment of Flying Qualities draws on the modelling and simulation discipline on the one hand and testing methodologies on the other. Checking predictions in flight requires clearly defined ‘mission-task-elements’, derived from missions with realistic performance requirements. High fidelity simulations also form the basis for the design of stability and control augmentation systems, essential for conferring Level 1 Flying Qualities. The integrated description of flight dynamic modelling, simulation and flying qualities forms the subject of this book, which will be of interest to engineers in research laboratories and manufacturing industry, test pilots and flight test engineers, and as a reference for graduate and postgraduate students in aerospace engineering. The Author Gareth Padfield, a Fellow of the Royal Aeronautical Society, is the Bibby Professor of Aerospace Engineering at the University of Liverpool. He is an aeronautical engineer by training and has spent his career to date researching the theory and practice of flight for both fixed-wing aeroplanes and rotorcraft. During his years with the UK’s Royal Aircraft Establishment and Defence Evaluation and Research Agency, he conducted research into rotorcraft dynamics, handling qualities and flight control. His work has involved a mix of flight testing, creating and testing simulation models and developing analytic approximations to describe flight behaviour and handling qualities. Much of his research has been conducted in the context of international collaboration – with the Technical Co-operation Programme, AGARD and GARTEUR as well as more informal collaborations with industry, universities and research centres worldwide. He is very aware that many accomplishments, including this book, could not have been achieved without the global networking that aerospace research affords. During the last 8 years as an academic, the author has continued to develop his knowledge and understanding in flight dynamics, not only through research, but also through teaching the subject at undergraduate level; an experience that affords a new and deeper kind of learning that, hopefully, readers of this book will benefit from.
Author :United States. Adjutant-General's Office. Personnel Research Branch Publisher : ISBN 13 : Total Pages :48 pages Book Rating :4.:/5 (319 download)
Book Synopsis Evaluation of Experimental Predictors for Selecting Army Helicopter Pilot Trainees-II by : United States. Adjutant-General's Office. Personnel Research Branch
Download or read book Evaluation of Experimental Predictors for Selecting Army Helicopter Pilot Trainees-II written by United States. Adjutant-General's Office. Personnel Research Branch and published by . This book was released on 1958 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Neural Network Approach for Helicopter Airspeed Prediction by : Ozcan Samlioglu
Download or read book A Neural Network Approach for Helicopter Airspeed Prediction written by Ozcan Samlioglu and published by . This book was released on 2002-03-01 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional pitot-static airspeed measurement systems do not yield accurate measurements when aircraft speed is below 40 knots. Recent studies have demonstrated that neural network approaches for predicting airspeed are quite promising. In this thesis, a back-propagation neural network is used to predict the airspeed of UH-60A and OH-6A helicopters in the low speed environment. The input data to the neural networks were obtained using the FLIGHTLAB flight simulator. The results obtained by flight simulation were validated by comparison to results of a previous study of the UH-60A helicopter based on actual flight data. The results of the work performed for this thesis show that at sea level the UH-60A low airspeed can be predicted with an accuracy of +/- 0. 71 knots and +/- 0.88 knots for out of ground effect and in ground effect conditions respectively. OH-6A analyses were performed at two pressure altitudes. At sea level the OH-6A airspeed can be predicted with an accuracy +/- 0.75 knots when the aircraft is out of ground effect and +/- 0.88 knots when the helicopter is in ground effect. At a pressure altitude of 6000 feet OH-6A airspeed can be predicted with an accuracy of +/- 0.64 knots for both flight conditions.
Book Synopsis Naval Research Logistics Quarterly by :
Download or read book Naval Research Logistics Quarterly written by and published by . This book was released on 1969 with total page 1186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
