Considerations Of Methods Of Improving Helicopter Efficiency
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Considerations Of Methods Of Improving Helicopter Efficiency
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Author : Richard C. Dingeldein
language : en
Publisher:
Release Date : 1961
Considerations Of Methods Of Improving Helicopter Efficiency written by Richard C. Dingeldein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Aerodynamics categories.
Considerations Of Methods Of Improving Helicopter Efficiency
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Author : Richard C. Dingeldein
language : en
Publisher:
Release Date : 1961
Considerations Of Methods Of Improving Helicopter Efficiency written by Richard C. Dingeldein and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with categories.
Recent NASA helicopter research indicates that significant improvements in hovering efficiency, up to 7 percent, are available from the use of a special airfoil section formed by combining an NACA 632A015 thickness distribution with an NACA 230 mean line. This airfoil should be considered for flying-crane-type helicopters. Application of standard leading-edge roughness causes a large drop in efficiency; however, the cambered rotor is shown to retain its superiority over a rotor having a symmetrical airfoil when both rotors have leading-edge roughness. A simple analysis of available rotor static-thrust data indicates a greatly reduced effect of compressibility effects on the rotor profile-drag power than predicted from calculations. Preliminary results of an experimental study of helicopter parasite drag indicate the practicability of achieving an equivalent flat-plate parasite-drag area of less than 4 square feet for a rotor-head-pylon-fuselage configuration (landing gear retracted) in the 2,000-pound minimum-flying-weight class. The large drag penalty of a conventional skid-type landing (3.6 square feet) can be reduced by two-thirds by careful design. Clean, fair, and smooth fuselages that tend to have narrow, deep cross sections are shown to have advantages from the standpoint of drag and download. A ferry range of the order of 1,500 miles is indicated to be practicable for the small helicopter considered.
Nasa Technical Note
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Author :
language : en
Publisher:
Release Date : 1962
Nasa Technical Note written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1962 with categories.
Research Requirements For Development Of Improved Helicopter Rotor Efficiency
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Author :
language : en
Publisher:
Release Date : 1976
Research Requirements For Development Of Improved Helicopter Rotor Efficiency written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Helicopter Theory
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Author : Wayne Johnson
language : en
Publisher: Courier Corporation
Release Date : 2012-03-07
Helicopter Theory written by Wayne Johnson and has been published by Courier Corporation this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-03-07 with Technology & Engineering categories.
Monumental engineering text covers vertical flight, forward flight, performance, mathematics of rotating systems, rotary wing dynamics and aerodynamics, aeroelasticity, stability and control, stall, noise, and more. 189 illustrations. 1980 edition.
Safety Considerations
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Author :
language : en
Publisher:
Release Date : 2010
Safety Considerations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
Linear And Nonlinear Control Of Small Scale Unmanned Helicopters
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Author : Ioannis A. Raptis
language : en
Publisher: Springer
Release Date : 2011-03-25
Linear And Nonlinear Control Of Small Scale Unmanned Helicopters written by Ioannis A. Raptis and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-03-25 with Technology & Engineering categories.
There has been significant interest for designing flight controllers for small-scale unmanned helicopters. Such helicopters preserve all the physical attributes of their full-scale counterparts, being at the same time more agile and dexterous. This book presents a comprehensive and well justified analysis for designing flight controllers for small-scale unmanned helicopters guarantying flight stability and tracking accuracy. The design of the flight controller is a critical and integral part for developing an autonomous helicopter platform. Helicopters are underactuated, highly nonlinear systems with significant dynamic coupling that needs to be considered and accounted for during controller design and implementation. Most reliable mathematical tools for analysis of control systems relate to modern control theory. Modern control techniques are model-based since the controller architecture depends on the dynamic representation of the system to be controlled. Therefore, the flight controller design problem is tightly connected with the helicopter modeling. This book provides a step-by-step methodology for designing, evaluating and implementing efficient flight controllers for small-scale helicopters. Design issues that are analytically covered include: • An illustrative presentation of both linear and nonlinear models of ordinary differential equations representing the helicopter dynamics. A detailed presentation of the helicopter equations of motion is given for the derivation of both model types. In addition, an insightful presentation of the main rotor's mechanism, aerodynamics and dynamics is also provided. Both model types are of low complexity, physically meaningful and capable of encapsulating the dynamic behavior of a large class of small-scale helicopters. • An illustrative and rigorous derivation of mathematical control algorithms based on both the linear and nonlinear representation of the helicopter dynamics. Flight controller designs guarantee that the tracking objectives of the helicopter's inertial position (or velocity) and heading are achieved. Each controller is carefully constructed by considering the small-scale helicopter's physical flight capabilities. Concepts of advanced stability analysis are used to improve the efficiency and reduce the complexity of the flight control system. Controller designs are derived in both continuous time and discrete time covering discretization issues, which emerge from the implementation of the control algorithm using microprocessors. • Presentation of the most powerful, practical and efficient methods for extracting the helicopter model parameters based on input/output responses, collected by the measurement instruments. This topic is of particular importance for real-life implementation of the control algorithms. This book is suitable for students and researches interested in the development and the mathematical derivation of flight controllers for small-scale helicopters. Background knowledge in modern control is required.
Technical Abstract Bulletin
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Author : Defense Documentation Center (U.S.)
language : en
Publisher:
Release Date : 1961-04
Technical Abstract Bulletin written by Defense Documentation Center (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961-04 with Military art and science categories.
Journal Of The American Helicopter Society
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Author : American Helicopter Society
language : en
Publisher:
Release Date : 1976
Journal Of The American Helicopter Society written by American Helicopter Society and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Helicopters categories.