Evaluation of Xv-15 Tilt Rotor Aircraft for Flying Qualities Research Application PDF Download
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Author: R.C. Radford
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: R.C. Radford
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781723407215
Category :
Languages : en
Pages : 26
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The effective use of simulation from issuance of the request for proposal through conduct of a flight test program for the XV-15 Tilt Rotor Research Aircraft is discussed. From program inception, simulation complemented all phases of XV-15 development. The initial simulation evaluations during the source evaluation board proceedings contributed significantly to performance and stability and control evaluations. Eight subsequent simulation periods provided major contributions in the areas of control concepts; cockpit configuration; handling qualities; pilot workload; failure effects and recovery procedures; and flight boundary problems and recovery procedures. The fidelity of the simulation also made it a valuable pilot training aid, as well as a suitable tool for military and civil mission evaluations. Simulation also provided valuable design data for refinement of automatic flight control systems. Throughout the program, fidelity was a prime issue and resulted in unique data and methods for fidelity evaluation which are presented and discussed. Churchill, G. B. and Dugan, D. C. Ames Research Center NASA-TM-84222, A-8848, NAS 1.15:84222 RTOP 532-04-11
Author: Martin D. Maisel
Publisher: BiblioGov
ISBN: 9781289146375
Category :
Languages : en
Pages : 224
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This monograph is a testament to the efforts of many people overcoming multiple technical challenges encountered while developing the XV-15 tilt rotor research aircraft. The Ames involvement with the tilt rotor aircraft began in 1957 with investigations of the performance and dynamic behavior of the Bell XV-3 tilt rotor aircraft. At that time, Ames Research Center was known as the Ames Aeronautical Laboratory of the National Advisory Committee for Aeronautics (NACA). As we approach the new millennium, and after more than 40 years of effort and the successful completion of our initial goals, it is appropriate to reflect on the technical accomplishments and consider the future applications of this unique aircraft class, the tilt rotor. The talented engineers, technicians, managers, and leaders at Ames have worked hard with their counterparts in the U.S. rotorcraft industry to overcome technology barriers and to make the military and civil tilt rotor aircraft safer, environmentally acceptable, and more efficient. The tilt rotor aircraft combines the advantages of vertical takeoff and landing capabilities, inherent to the helicopter, with the forward speed and range of a fixed wing turboprop airplane. Our studies have shown that this new vehicle type can provide the aviation transportation industry with the flexibility for highspeed, long-range flight, coupled with runway-independent operations, thus having a significant potential to relieve airport congestion. We see the tilt rotor aircraft as an element of the solution to this growing air transport problem.
Author: Wallace H. Deckert
Publisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 131
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The XV-3 was tested by the Air Force Flight Test Center to evaluate the performance and flying qualities of this research vehicle, and to relate test results to the fixed-wing prop-rotor principle. The XV-3 is a fixed mid-wing aircraft manufactured by Bell Helicopter Corporation. A two bladed prop-rotor is mounted on each wing tip. The prop-rotors may be tilted 90 degress for conventional airplane flight. The aircraft has a conventional empennage with added ventral fin and uses a skid type landing gear. Several unacceptable deficiencies were noted during the test program. The most important question, however, is whether these deficiencies are hardware problems peculiar to the XV-3 itself, or whether they are deficiencies that are inherent in any fixed-wing prop-rotor design. Within the scope of the flight test evaluation, it appears that the fixed-wing prop-rotor principle is feasible and should be given serious consideration in the future vertical take-off design competition.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Author: Mark B. Tischler
Publisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 200
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Timely design and development of the next generation of tiltrotor aircraft (JVX) depend heavily on in-depth understanding of existing XV-15 dynamics and the availability of fully validated simulation models. Objects of the present study are: 1. Documentation and evaluation of XV-15 bare-airframe dynamics; 2. Comparison of aircraft and simulation responses; and Development of a validated transfer-function description of the XV-15 needed for future studies. A nonparametric frequency-response approach is used which does not depend on assumed model order or structure. Transfer-function representations are derived which fit the frequency responses in the bandwidth of greatest concern for piloted handling-qualities and control-system applications. Flight tests on the VX-15 aircraft and piloted-simulation for four flight conditions from hover to cruise were planned and executed. Improved test techniques and pilot-training procedures were devised. Analytical software tools allow the identification of high-resolution spectural responses and the derivation and validation of multi-input/multi-output transfer-function models. These techniques were applied in an extensive evaluation of the open-loop flight dynamics of the XV-15 aircraft and simulation mathematical models. Deficiencies in the mathematical models were exposed and documented.
Author: Martin D. Maisel
Publisher: Government Reprints Press
ISBN: 9781931641272
Category : Technology & Engineering
Languages : en
Pages : 0
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Beskriver det amerikanske forsøgsprojekt med en Tilt Rotor på en flyvemaskine
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 26
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For the past 20 years, a significant effort has been made to understand and predict the structural aeroelastic stability characteristics of the tilt rotor concept. Beginning with the rotor-pylon oscillation of the XV-3 aircraft, and the problem was identified and then subjected to a series of theoretical studies, plus model and full-scale wind tunnel tests. From this data base, methods were developed to predict the structural aeroelastic stability characteristics of the XV-15 Tilt Rotor Research Aircraft. This paper examines the predicted aeroelastic characteristics in light of the major parameters effecting rotor-pylon-wing stability; describes flight test techniques used to obtain XV-15 aeroelastic stability; presents a summary of flight test results; compares the flight test results to the predicted values; and presents a limited comparison of wind tunnel results, flight test results, and their correlation with predicted values.
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781724232700
Category :
Languages : en
Pages : 28
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Calculated performance, loads, and stability of the XV-15 tilt rotor research aircraft are compared with wind tunnel and flight measurements, to define the level of the current analytical capability for tilting prop rotor aircraft, and to define the requirements for additional experimental data and further analysis development. The correlation between calculated and measured behavior is generally good, although there are some significant discrepancies. Based on this correlation, the analysis is assessed overall as being adequate for the design, evaluation, and testing of tilting prop rotor aircraft. A general assessment of the state of the art of tilt rotor predictive capability is given. Specific areas are identified where improvements in the capability to calculate performance, loads, and stability are desirable. Requirements for more accurate and detailed data which support the development of improved analytical models are identified as well. Johnson, W. Ames Research Center NASA-TP-2291, A-9411, NAS 1.60:2291 RTOP 505-42-11
Author: Bryan D. Edwards
Publisher:
ISBN:
Category : Tilt rotor aircraft
Languages : en
Pages : 70
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