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Author : Jeff Lusardi
Publisher :
ISBN 13 :
Total Pages : 210 pages
Book Rating : 4.:/5 (68 download)
Download or read book Control Equivalent Turbulence Input Model for the UH-60 Helicopter written by Jeff Lusardi and published by . This book was released on 2004 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Steven J. Labows
Publisher :
ISBN 13 : 9781423538080
Total Pages : 123 pages
Book Rating : 4.5/5 (38 download)
Download or read book UH-60 Black Hawk Disturbance Rejection Study for Hover/Low Speed Handling Qualities Criteria and Turbulence Modeling written by Steven J. Labows and published by . This book was released on 2000-03-01 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helicopters operate in an environment where task performance can easily be affected by atmospheric turbulence. This paper discusses the airborne flight test of the Sikorsky UH-60 Black Hawk helicopter in turbulent conditions to determine disturbance rejection criteria and to develop a low speed turbulence model for helicopter simulation. A simple approach to modeling the aircraft response to turbulence is described by using an identified model of the Black Hawk to extract representative control inputs that replicate the aircraft response to disturbances. This parametric turbulence model is designed to be scaled for varying levels of turbulence and utilized in ground or in-flight simulation. Flight control cutoff frequency data are also analyzed to support design criteria for gust rejection handling qualities.
Author : Jörg Buchholz
Publisher : GRIN Verlag
ISBN 13 : 3638900592
Total Pages : 48 pages
Book Rating : 4.6/5 (389 download)
Download or read book Inversion Impossible? written by Jörg Buchholz and published by GRIN Verlag. This book was released on 2008-01-28 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research Paper (postgraduate) from the year 2007 in the subject Computer Science - Applied, grade: keine, University of Applied Sciences Bremen, language: English, abstract: Under the terms of the US/German MoU (Helicopter Aeromechanics) the Task IX - Modeling and Simulation for Rotorcraft Systems - is defined: ”The overall objective of this task is to improve the modeling accuracy and understanding of helicopter dynamics and control. Improved modeling and understanding of the important issues can be used to increase the fidelity of ground-based simulations, thus allowing early pilot evaluation during the development of new control systems, compatibility checks for improved safety, decreases in experimental flight testing, and hence a reduction in costs and risks.” One of the recent subtasks under Task IX has been a disturbance rejection study [1], resulting in a UH-60 Black Hawk control equivalent turbulence simulation model [2]. Figure 1: Turbulence model extraction As illustrated in Figure 1 the basic idea is to have a pilot loosely stabilize a helicopter in a turbulent (input T ) environment (e. g. hovering on the leeward side of a high building), and measure the pilot control inputs (P ) and the reaction (rates, velocities, . . . ) of the helicopter (x). In the off-line extraction phase the measured reaction x (which includes the reaction of the helicopter to both the turbulence and the pilot input) is fed into an inverse model of the helicopter, resulting in the corresponding control input P+T that would be necessary to produce the measured reaction. Again, P+T includes turbulence and pilot input. If the measured pilot input P is subtracted, an equivalent turbulence input Teq remains. This equivalent turbulence input can then directly be used as an additional control input in any kind of simulator; without the need to gain and implement more complex turbulence models. During the actual model extraction approach [1] it became clear that ”Ideally, an exact numerical inverse of the coupled MIMO model would be used.” This paper will therefore present and discuss different approaches to invert dynamical systems.
Author : Peter D. Talbot
Publisher :
ISBN 13 :
Total Pages : 50 pages
Book Rating : 4.:/5 (317 download)
Download or read book A Mathematical Force and Moment Model of a UH-1H Helicopter for Flight Dynamics Simulations written by Peter D. Talbot and published by . This book was released on 1977 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 942 pages
Book Rating : 4.F/5 ( download)
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael S. Lewis
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.F/5 ( download)
Download or read book A Piloted Simulation of Helicopter Air Combat to Investigate Effects of Variations in Selected Performance and Control Response Characteristics written by Michael S. Lewis and published by . This book was released on 1987 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Tyler T. Christoffel
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (119 download)
Download or read book Simulation of a Helicopter Operating in a Turbulent Airwake with Atmospheric Boundary Layer Effects written by Tyler T. Christoffel and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A method for developing and performing a rotorcraft flight simulation in the airwake behind a bluff body is investigated and compared to flight test data. This method is broadly composed of two parts: an atmospheric boundary layer computational simulation that is unsteady and time-accurate, and a UH-60 flight dynamics program that can be coupled with an airwake developed from the atmospheric boundary layer simulation. The airwake simulations are performed using the open source CFD software OpenFOAM with a solver package originally developed by the National Renewable Energy Laboratory. The flight dynamics program is an implementation of the GENHEL model known as PSUHeloSim. The computational fluid dynamics airwake solution is developed to recreate the airwake present for the validation case flight tests that were used to collect the flight test data. The validation case flight test data was collected from a variety of station-keeping tasks performed in the wake of a hangar on land. For the current investigation, two kinds of flight simulations were performed: piloted simulations in a flight simulator facility and flight simulations performed using a pilot model. Comparisons between flight test data and simulated flight data were made based on power spectral density analyses of both pilot control activity and aircraft motion. Comparisons of pilot control stick activity reveal that pilots in the simulated flight tests used higher control activity energy than the flight test validation case pilots. An analysis of the vehicle angular rates yielded similar results, with the overall trends of power versus frequency being similar but a significantly higher power being seen for the piloted flight simulations. Limited data did show sizeable differences in pilot control activity for the same simulated flight task flown by different pilots in the flight simulation facility. Pilot variability, combined with other obfuscating effects such as inherently higher pilot control energy in a simulated environment than in physical rotorcraft, make an exact reproduction of the validation case flight test data infeasible for this investigation. That being said, a number of unknowns and methodological improvements were identified and discussed. The pilot model was not used to compare simulated flights to validation case flights, but was useful for analyzing sensitivity of flight simulations to positioning error within a simulated airwake as well as for comparing flight simulations in different airwakes to each other without the variability associated with human pilots. It was found that flight simulations in airwakes generated with an atmospheric boundary layer flow required higher pilot control activity than flight simulations in airwakes generated by a simple uniform inflow.
Author : Lloyd D. Corliss
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (317 download)
Download or read book A Failure Effects Simulation of a Low Authority Flight Control Augmentation System on a UH-1H Helicopter written by Lloyd D. Corliss and published by . This book was released on 1977 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jinggen Zhao
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (618 download)
Download or read book Dynamic Wake Distortion Model for Helicopter Maneuvering Flight written by Jinggen Zhao and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new rotor dynamic wake distortion model, which can be used to account for the rotor transient wake distortion effect on inflow across the rotor disk during helicopter maneuvering and transitional flight in both hover and forward flight conditions, is developed. The dynamic growths of the induced inflow perturbation across the rotor disk during different transient maneuvers, such as a step pitch or roll rate, a step climb rate and a step change of advance ratio are investigated by using a dynamic vortex tube analysis. Based on the vortex tube results, a rotor dynamic wake distortion model, which is expressed in terms of a set of ordinary differential equations, with rotor longitudinal and lateral wake curvatures, wake skew and wake spacing as states, is developed. Also, both the Pitt-Peters dynamic inflow model and the Peters-He finite state inflow model for axial or forward flight are augmented to account for rotor dynamic wake distortion effect during helicopter maneuvering flight. To model the aerodynamic interaction among main rotor, tail rotor and empennage caused by rotor wake curvature effect during helicopter maneuvering flight, a reduced order model based on a vortex tube analysis is developed. Both the augmented Pitt-Peters dynamic inflow model and the augmented Peters-He finite state inflow model, combined with the developed dynamic wake distortion model, together with the interaction model are implemented in a generic helicopter simulation program of UH-60 Black Hawk helicopter and the simulated vehicle control responses in both time domain and frequency domain are compared with flight test data of a UH-60 Black Hawk helicopter in both hover and low speed forward flight conditions.
Author : American Helicopter Society
Publisher :
ISBN 13 :
Total Pages : 612 pages
Book Rating : 4.X/5 (1 download)
Download or read book Journal of the American Helicopter Society written by American Helicopter Society and published by . This book was released on 1987 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : B. H. Mayhew
Publisher :
ISBN 13 :
Total Pages : 261 pages
Book Rating : 4.:/5 (86 download)
Download or read book Multivariable Digital Control Laws for the UH-60A Black Hawk Helicopter written by B. H. Mayhew and published by . This book was released on 1984 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates the application of multivariable design techniques developed by Professor Brian Porter of the University of Salford, England to design digital control laws for the UH-60A Black Hawk helicopter. In the study, designs were developed for five longitudinally and laterally, strongly coupled plants with control inputs of cyclic roll control, cyclic pitch control, collective lift control, and tail rotor yaw control. An improved computer-aided design packaged called 'MULTI' was used in refining the control laws. Separate controllers were developed to perform three flight maneuvers. The maneuvers performed were a coordinated turn, a yaw rate response, and a vertical rate response. Since each maneuver is flown at a different airspeed, a uniquely specified linearized plant model was required. The methods employed to obtain a design are presented along with the evaluations of the final control laws. After successful designs of the individual control laws for the three maneuvers were developed, tests were performed to find a single controller to perform each maneuver for its applicable flight conditions. Finally, the evaluation of the robustness of the single controllers is presented. (Author).
Author : Peter H. Tyson
Publisher :
ISBN 13 : 9781423545231
Total Pages : 303 pages
Book Rating : 4.5/5 (452 download)
Download or read book Simulation Validation and Flight Prediction of UH-60A Black Hawk Helicopter/Slung Load Characteristics written by Peter H. Tyson and published by . This book was released on 1999-03-01 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helicopter/slung load systems are two body systems in which the slung load adds its rigid body dynamics, aerodynamics, and sling stretching dynamics to the helicopter. The slung load can degrade helicopter handling qualities and reduce the flight envelope of the helicopter. Confirmation of system stability parameters and envelope is desired, but flight test evaluation is time consuming and costly. A simulation model validated for handling quality assessments would significantly reduce resources expended in flight testing while increasing efficiency, productivity, and safety by aiding researchers, designers, and pilots to understand factors affecting helicopter-slung load handling qualities. This thesis describes a comprehensive dynamics and aerodynamics model for slung load simulation, obtained by integrating the NASA Ames Gen Hel UH-60A simulation with slung load equations of motion. Frequency domain analysis is used to compare simulation to flight test frequency responses and key system stability parameters. Results are given for no load, a 4K lb Block, and a 4K lb CONEX load. Handling quality parameters, stability margins, and load pendulum motion roots for cases without load aerodynamics and with static wind tunnel data were compared. Results illustrated state-of-the-art simulation modeling of helicopter/slung load dynamics and its accuracy in predicting key dynamic parameters of interest.
Author : Robert L. Barrie
Publisher :
ISBN 13 : 9781423540335
Total Pages : 158 pages
Book Rating : 4.5/5 (43 download)
Download or read book Time Domain Validation of the Sikorsky General Helicopter (GenHel) Flight Dynamics Simulation Model for the UH-60L Wide Chord Blade Modification written by Robert L. Barrie and published by . This book was released on 1999-12-01 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helicopter design at the Sikorsky Aircraft Corporation is aided by the use of the Sikorsky General Helicopter (GenHel(registered)) Flight Dynamics Simulation Model. Specifically, GenHel output is used by both handling qualities and maneuver loads engineers as a predictive design tool. Inherent in the use of an analytical model is the requirement for validation. This report seeks to validate the GenHel(registered) flight dynamics simulation models used in the design of the UH-60L Wide Chord Blade (WCB) modification. initially comparisons are made between the current analytical models and flight test data for selected trim flight conditions and dynamic maneuvers. Based on the correlation of the data, modifications are made to the analytical model where necessary. The modified analytical model will be validated through a final comparison with test flight data. The goal of this report is to validate the use of Sikorsky's GenHel(registered) flight simulation program as an analytic predictive tool in the design of the WCB modification and identify any areas where improvements could be applied. Validation of the WCB GenHel model serves two purposes. First it confirms the ability of GenHel to model the flight dynamic response of the UH-60L with the WCB modification. Second it confirms the predictive loads forwarded to the structural engineers during the design phase of the WCB.
Author :
Publisher : Jeffrey Frank Jones
ISBN 13 :
Total Pages : 1386 pages
Book Rating : 4./5 ( download)
Download or read book Manuals Combined: U.S. Army TECHNICAL MANUAL OPERATOR’S MANUAL FOR UH-60A HELICOPTER UH-60Q HELICOPTER UH-60L HELICOPTER EH-60A HELICOPTER written by and published by Jeffrey Frank Jones. This book was released on with total page 1386 pages. Available in PDF, EPUB and Kindle. Book excerpt: BOTH MANUALS: Approved for public release; distribution unlimited. DESCRIPTION. This manual contains the complete operating instructions and procedures for UH-60A, UH-60Q, UH-60L, and EH-60A helicopters. The primary mission of this helicopter is that of tactical transport of troops, medical evacuation, cargo, and reconnaissance within the capabilities of the helicopter. The observance of limitations, performance, and weight and balance data provided is mandatory. The observance of procedures is mandatory except when modification is required because of multiple emergencies, adverse weather, terrain, etc. Your flying experience is recognized and therefore, basic flight principles are not included. IT IS REQUIRED THAT THIS MANUAL BE CARRIED IN THE HELICOPTER AT ALL TIMES.
Author : Mark Brian Tischler
Publisher : AIAA Education
ISBN 13 : 9781600868207
Total Pages : 0 pages
Book Rating : 4.8/5 (682 download)
Download or read book Aircraft and Rotorcraft System Identification written by Mark Brian Tischler and published by AIAA Education. This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although many books have been written on the theory of system identification, few are available that provide a complete engineering treatment of system identification and how to successfully apply it to flight vehicles. This book presents proven methods, practical guidelines, and real-world flight-test results for a wide range of state-of-the-art flight vehicles, from small uncrewed aerial vehicles (UAVs) to large manned aircraft/rotorcraft.
Author :
Publisher :
ISBN 13 :
Total Pages : 372 pages
Book Rating : 4.3/5 (91 download)
Download or read book Index to Theses with Abstracts Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 2005 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 458 pages
Book Rating : 4.0/5 ( download)
Download or read book AIAA 28th Aerospace Sciences Meeting written by and published by . This book was released on 1990 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
