Download or read book The Effect of Vertical Axis Characteristics on Helicopter Handling Qualities written by S. W. Baillie and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The impact of vertical axis characteristics on helicopter handling qualities written by S. W. Baillie and published by . This book was released on 1987 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Impact of Vertical Axis Characteristics on Helicopter Handling Qualities written by Stewart W. Baillie and published by Flight Research Laboratory. This book was released on 1987 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of two in-flight simulation programs on the impact of vertical axis characteristics on rotorcraft handling qualities are presented. The parameters investigated were heave damping, thrust to weight ratio, and various dynamic response characteristics of the combined engine, governor and rotor system. Flight tasks included hover, hover manoeuvring and nap of the earth flight. Evaluation of 11 configurations where heave damping and thrust to weight ratio values were varied provides the basis to suggest that the amount of heave damping represented by Zw = -0.20/sec and a thrust to weight ratio of 1.08 are boundary values for Level 1 helicopter handling qualities. These results are compared with other relevant work. Stabilization and control of engine torque was found to be a major source of pilot workload for models with higher order engine-rotor system response characteristics of a 3 db resonant peak in the transfer function between collective and engine torque which is postulated as an upper limit for Level 1 handling qualities. The benefit of displacing this peak to higher frequencies, corresponding to separating the resonance from the typical pilot's bandwidth, is suggested.

Download or read book The Impact of Vertical Axis Characters on Helicopter Handling Qualities written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Impact of Verticle Axis Characteristics on Helicopter Handling Qualities written by National Aeronautical Establishment (Canada) and published by . This book was released on 1987 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Helicopter Handling Qualities Study of the Effects of Engine Response Characteristics Height Control Dynamics and Excess Power on Nap of the Earth Operations written by Lloyd D. Corliss and published by . This book was released on 1982 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: A ground-based simulation study was conducted on a large-scale motion simulator to study the effects in the vertical axis of engine response characteristics on handling qualities for a nap-of-the-earth (NOE) operating environment. This study concentrated specifically on the helicopter configuration with an rpm-governed gas-turbine engine and expands previous work by focusing on aspects peculiar to rotary-wing and NOE operations. A wide range of engine response time, vehicle damping and sensitivity, and excess power levels was studied. The data are compared with the existing handling-qualities specifications, MIL-F-83300 and AGARD 577, and in general show a need for higher minimums when performing such NOE maneuvers as a dolphin and bob-up task. (Author).

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.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Helicopter Flight Dynamics written by Gareth D. Padfield and published by John Wiley & Sons. This book was released on 2018-09-07 with total page 856 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Book The behaviour of helicopters and tiltrotor aircraft 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 and second editions of Helicopter Flight Dynamics, a comprehensive treatment of design criteria was presented, relating to both normal and degraded Flying Qualities. Fully embracing the consequences of Degraded Flying Qualities during the design phase will contribute positively to safety. In this third edition, two new Chapters are included. Chapter 9 takes the reader on a journey from the origins of the story of Flying Qualities, tracing key contributions to the developing maturity and to the current position. Chapter 10 provides a comprehensive treatment of the Flight Dynamics of tiltrotor aircraft; informed by research activities and the limited data on operational aircraft. Many of the unique behavioural characteristics of tiltrotors are revealed for the first time in this book. The accurate prediction and assessment of Flying Qualities draws on the modelling and simulation discipline on the one hand and testing practice on the other. Checking predictions in flight requires clearly defined mission tasks, derived from 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 of rotorcraft forms the subject of this book, which will be of interest to engineers practising and honing their skills in research laboratories, academia and manufacturing industries, test pilots and flight test engineers, and as a reference for graduate and postgraduate students in aerospace engineering.

Download or read book Investigation of Vertical Axis Handling Qualities for Helicopter Hover and Noe Flight written by S. W. Baillie and published by . This book was released on 1987 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The preliminary results of two in-flight simulation programs on vertical axis rotorcraft handling qualities are presented. The parameters investigated in these studies were heave damping, Zw thrust to weight ratio, T/W, and a number of dynamic engine governor/rotor system models. Flight tasks included hover, hover manoeuvering and nap of the earth (NOE) flight. Evaluation of 9 heave damping, thrust to weight ratio configurations provides that basis to suggest Level 1 Zw and T/W boundary values of -0.20 sec. and 1.08 respectively. These boundaries are compared with other relevant work on the topic. The engine governor/rotor system evaluation results tend to disagree with handling qualities predictions based on a vertical velocity shaping parameter however further investigation is required. NATO.

Download or read book Helicopter Handling Qualities written by and published by . This book was released on 1982 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book NASA Technical Paper written by and published by . This book was released on 1981 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Library of Congress Subject Headings written by Library of Congress and published by . This book was released on 2002 with total page 1546 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 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Library of Congress Subject Headings written by Library of Congress. Cataloging Policy and Support Office and published by . This book was released on with total page 1534 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Kinematic Properties of the Helicopter in Coordinated Turns written by Robert T. N. Chen and published by . This book was released on 1981 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Aeronautical Engineering written by and published by . This book was released on 1989 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).