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An Investigation Of The Effects Of Pitch Roll Decoupling On Helicopter Handling Qualities
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722939816 Total Pages :126 pages Book Rating :4.9/5 (398 download)
Book Synopsis An Investigation of the Effects of Pitch-Roll (De)Coupling on Helicopter Handling Qualities by : National Aeronautics and Space Administration (NASA)
Download or read book An Investigation of the Effects of Pitch-Roll (De)Coupling on Helicopter Handling Qualities written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive investigation of the effects of pitch-roll coupling on helicopter handling qualities was performed by the U.S. Army and Deutsche Forschungsanstalt fur Luft- und Raumfahrt (DLR), using a NASA ground-based and a DLR in-flight simulator. Over 90 different coupling configurations were evaluated using a high gain roll-axis tracking task. The results show that although the current ADS-33C coupling criterion discriminates against those types of coupling typical of conventionally controlled helicopters, it is not always suited for the prediction of handling qualities of helicopters with modern control systems. Based on the observation that high frequency inputs during tracking are used to alleviate coupling, a frequency domain pitch-roll coupling criterion that uses the average coupling ratio between the bandwidth and neutral stability frequency is formulated. This criterion provides a more comprehensive coverage with respect to the different types of coupling, shows excellent consistency, and has the additional benefit that compliance testing data are obtained from the bandwidth/phase delay tests, so that no additional flight testing is needed. Blanken, C. L. and Pausder, H. J. and Ockier, C. J. Ames Research Center CONTROLLABILITY; COUPLING; DECOUPLING; FLIGHT CONTROL; HELICOPTER CONTROL; HELICOPTER PERFORMANCE; HELICOPTERS; PITCH (INCLINATION); ROLL; AERODYNAMIC STABILITY; AIRCRAFT SAFETY; CONTROL STABILITY; HIGH GAIN; LATERAL CONTROL; LONGITUDINAL CONTROL; SIMULATION; TRACKING (POSITION)...
Book Synopsis An Investigation of the Effects of Pitch-roll (de)coupling on Helicopter Handling Qualities by : Carl J. Ockier
Download or read book An Investigation of the Effects of Pitch-roll (de)coupling on Helicopter Handling Qualities written by Carl J. Ockier and published by . This book was released on 1995 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An investigation of the effects of pitch-roll (de)-coupling on helicopter handling qualities by : Carl J. Ockier
Download or read book An investigation of the effects of pitch-roll (de)-coupling on helicopter handling qualities written by Carl J. Ockier and published by . This book was released on 1995 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effects of Various Combinations of Damping and Control Power on Helicopter Handling Qualities During Both Instrument and Visual Flight by : Seymour Salmirs
Download or read book The Effects of Various Combinations of Damping and Control Power on Helicopter Handling Qualities During Both Instrument and Visual Flight written by Seymour Salmirs and published by . This book was released on 1959 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Simulation Investigation of the Effects of Engine-and Thrust-response Characteristics on Helicopter Handling Qualities by :
Download or read book A Simulation Investigation of the Effects of Engine-and Thrust-response Characteristics on Helicopter Handling Qualities written by and published by . This book was released on 1983 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A program is being conducted to study the effects of engine response, rotor inertia, rpm control, excess power, and vertical damping on specific maneuvers included in nap-of-the-Earth (NOE) operations. Specifically, this study concentrates on the helicopter configuration with an rpm-governed gas-turbine engine and expands on handling qualities-criteria data by focusing on aspects peculiar to rotary-wing and NOE operations. This paper summarizes results of three moving-based piloted simulation studies and explores the frequency characteristics of helicopter thrust response which set it apart from other VTOL types. Power-system response is affected by both the engine governor response and the level of rotor inertia. However, results indicate that, with unlimited power, variations in engine response can have a significant effect on pilot rating, whereas changes in rotor inertia, in general, do not. Results also show that any pilot interaction required to maintain proper rpm control can significantly degrade handling qualities. Data for variations in vertical damping and collective sensitivity are compared with existing handling-qualities specifications, MIL-F-83300 and AGARD 577, and show a need for higher minimums for both damping and sensitivity for the bob-up task.
Book Synopsis A Piloted Simulator Investigation of Static Stability and Stability/control Augmentation Effects on Helicopter Handling Qualities for Instrument Approach by :
Download or read book A Piloted Simulator Investigation of Static Stability and Stability/control Augmentation Effects on Helicopter Handling Qualities for Instrument Approach written by and published by . This book was released on 1980 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt: A motion-base simulator was used to compare the flying qualities of three generic single-rotor helicopters during a full-attention-to-flight control task. Terminal-area VOR instrument approaches were flown with and without turbulence. The objective of this NASA/FAA study was to investigate the influence of helicopter static stability in terms of the values of cockpit control gradients as specified in the existing airworthiness criteria, and to examine the effectiveness of several types of stability control augmentation systems in improving the instrument-flight-rules capability of helicopters with reduced static stability. Two levels of static stability in the pitch, roll, and yaw axes were examined for a hingeless-rotor configuration; the variations were stable and neutral static stability in pitch and roll, and two levels of stability in yaw. For the lower level of static stability, four types of stability and control augmentation were also examined for helicopters with three rotor types: hingeless, articulated, and teetering. Pilot rating results indicate the acceptability of neutral static stability longitudinally and laterally and the need for pitch-roll attitude augmentation to achieve a satisfactory system. (Author).
Book Synopsis An Exploratory Investigation of Factors Affecting the Handling Qualities of a Rudimentary Hingeless Rotor Helicopter by : Robert J. Huston
Download or read book An Exploratory Investigation of Factors Affecting the Handling Qualities of a Rudimentary Hingeless Rotor Helicopter written by Robert J. Huston and published by . This book was released on 1966 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Pilot's Assessment of Helicopter Handling-quality Factors Common to Both Agility and Instrument Flying Tasks by :
Download or read book A Pilot's Assessment of Helicopter Handling-quality Factors Common to Both Agility and Instrument Flying Tasks written by and published by . This book was released on 1980 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Helicopter Handling Qualities written by and published by . This book was released on 1982 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Wind-tunnel Investigation of Helicopter Directional Control in Rearward Flight in Ground Effect by : Robert J. Huston
Download or read book A Wind-tunnel Investigation of Helicopter Directional Control in Rearward Flight in Ground Effect written by Robert J. Huston and published by . This book was released on 1971 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation was conducted in the Langley full-scale tunnel to study the aerodynamics that produce directional-control problems for a helicopter with a tail rotor in low-speed rearward flight in ground effect. A helicopter model mounted close to the tunnel floor was tested in tail winds from 0 to 25 knots.
Book Synopsis Study of Helicopterroll Control Effectiveness Criteria by :
Download or read book Study of Helicopterroll Control Effectiveness Criteria written by and published by . This book was released on 1986 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of helicopter roll control effectiveness based on closed-loop task performance measurement and modeling is presented. Roll control criteria are based upon task margin, the excess of vehicle task performance capability over the pilot's task performance demand. Appropriate helicopter roll axis dynamic models are defined for use with analytic models for task performance. Both near-earth and up-and-away large-amplitude maneuvering phases are considered. The results of in-flight and moving-base simulation measurements are presented to support the roll control effectiveness criteria offered. This Volume contains the theoretical analysis, simulation results and criteria development. Keywords: Rotorcraft; Helicopter handling qualities. (Author).
Book Synopsis The Effects of Pilot Stress Factors on Handling Quality Assessments During US/German Helicopter Agility Flight Tests by :
Download or read book The Effects of Pilot Stress Factors on Handling Quality Assessments During US/German Helicopter Agility Flight Tests written by and published by . This book was released on 1982 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Helicopter Flight Investigation of Roll-control Sensitivity, Damping and Cross Coupling in a Low Altitude Lateral Maneuvering Task by :
Download or read book A Helicopter Flight Investigation of Roll-control Sensitivity, Damping and Cross Coupling in a Low Altitude Lateral Maneuvering Task written by and published by . This book was released on 1983 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: A helicopter in-flight simulation was conducted to determine the effects of variations in roll damping, roll sensitivity, and pitch- and roll-rate cross-coupling on helicopter flying qualities in a low-altitude maneuver. The experiment utilized the Ames UH-1H helicopter in-flight simulator, which is equipped with the V/STOLAND avionics system. The response envelope of this vehicle allowed simulation of configurations with low-to-moderate damping and sensitivity. A visual, low-level slalom course was set up, consisting of constant-speed and constant-altitude S-turns around the 1000-ft markers of an 8000-ft runway. Results are shown in terms of Cooper-Harper pilot ratings, pilot commentary, and statistical and frequency analyses of the lateral characteristics. These results show good consistency with previous ground-simulator results and are compared with existing flying-qualities criteria, such as those set forth in MIL-F-83300 and MIL-H-8501A. (Author).
Book Synopsis Effects of Rotor Parameter Variations on Handling Qualities of Unaugmented Helicopters in Simulated Terrain Flight by : Peter D. Talbot
Download or read book Effects of Rotor Parameter Variations on Handling Qualities of Unaugmented Helicopters in Simulated Terrain Flight written by Peter D. Talbot and published by . This book was released on 1980 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Compilation and Analysis of Helicopter Handling Qualities Data. Volume 2: Data Analysis by : Robert K. Heffley
Download or read book A Compilation and Analysis of Helicopter Handling Qualities Data. Volume 2: Data Analysis written by Robert K. Heffley and published by . This book was released on 1979 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Gross Changes in Static Directional Stability on V/STOL Handling Characteristics Based on a Flight Investigation by : John F. Garren (Jr.)
Download or read book Effects of Gross Changes in Static Directional Stability on V/STOL Handling Characteristics Based on a Flight Investigation written by John F. Garren (Jr.) and published by . This book was released on 1964 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723142383 Total Pages :112 pages Book Rating :4.1/5 (423 download)
Book Synopsis Helicopter Roll Control Effectiveness Criteria Program Summary by : National Aeronautics and Space Administration (NASA)
Download or read book Helicopter Roll Control Effectiveness Criteria Program Summary written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of helicopter roll control effectiveness is summarized for the purpose of defining military helicopter handling qualities requirements. The study is based on an analysis of pilot-in-the-loop task performance of several basic maneuvers. This is extended by a series of piloted simulations using the NASA Ames Vertical Motion Simulator and selected flight data. The main results cover roll control power and short-term response characteristics. In general the handling qualities requirements recommended are set in conjunction with desired levels of flight task and maneuver response which can be directly observed in actual flight. An important aspect of this, however, is that vehicle handling qualities need to be set with regard to some quantitative aspect of mission performance. Specific examples of how this can be accomplished include a lateral unmask/remask maneuver in the presence of a threat and an air tracking maneuver which recognizes the kill probability enhancement connected with decreasing the range to the target. Conclusions and recommendations address not only the handling qualities recommendations, but also the general use of flight simulators and the dependence of mission performance on handling qualities. Heffley, Robert K. and Bourne, Simon M. and Mnich, Marc A. Unspecified Center HELICOPTER DESIGN; LATERAL CONTROL; MILITARY HELICOPTERS; PROJECT MANAGEMENT; ROTARY WING AIRCRAFT; AIRCRAFT CONTROL; AIRCRAFT STABILITY; CONTROLLABILITY; FLIGHT SIMULATORS...
