Coaxial Helicopter Rc In Steady Vertcal Flight And Hovering

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Coaxial Helicopter Rc In Steady Vertcal Flight And Hovering

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Author : Jia Jian Teoh
language : en
Publisher:
Release Date : 2007

Coaxial Helicopter Rc In Steady Vertcal Flight And Hovering written by Jia Jian Teoh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Aerospace engineering categories.

Performance Analysis Of Coaxial Helicopter In Hover And Forward Flight

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Author : Stanrich D. Fernandes
language : en
Publisher:
Release Date : 2017

Performance Analysis Of Coaxial Helicopter In Hover And Forward Flight written by Stanrich D. Fernandes and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Helicopters categories.

The performance of a coaxial rotor system has been analyzed by establishing a proper basis of comparison between a conventional single between a conventional single rotor and coaxial rotor. An attempt rotor and coaxial rotor. An attempt has also been made to better understand the complicated aerodynamic interactions associated with coaxial rotor wakes by using a free-vortex methodology (FVM). The FVM is a Lagrangian-based wake convection methodology, which solves for the evolution of the vortical wake produced by the rotor blades under the influence of an external flow. The extent to which the two rotors interact with each other was found to be highly dependent on the inter-rotor spacing. To this end, parametric variations of inter-rotor spacing were performed to show the effect on performance on each rotor and also as a system. An attempt was made to quantify the effect of aerodynamic interference on the performance of the upper and lower rotor by comparing them to an isolated rotor. It was shown that the equivalent single rotor performs better than the coaxial rotor at moderately high advance ratios, while the coaxial rotor performs better in hover. The inter-rotor spacing profoundly affected the performance of the coaxial rotor system, giving higher power requirements a lower inter-rotor spacing. Finally, it was shown that the upper rotor becomes affected by the lower rotor in hover, and while this was an expected result in hover and low advance ratios, the performance of the upper rotor was also affected at higher advance ratios.

Micro Coaxial Helicopter Controller Design

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Author : Zelimir Husnic
language : en
Publisher:
Release Date : 2015

Micro Coaxial Helicopter Controller Design written by Zelimir Husnic and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Helicopters categories.

One of the advantages of the micro coaxial helicopter is in its maneuverability. It can perform some flight maneuvers that a fixed-wing aircraft cannot do - like hovering, perching, vertical take-off and landing, flying backwards, or moving sideways to the left or to the right. It is also more agile than the conventional helicopter with a counter-gyro effect rotor at the tail of the fuselage. However, due to its small size and sensitivity to disturbances, the micro coaxial helicopter is more challenging to control than a full-scale helicopter. \In this work, the flight dynamics of the micro coaxial helicopter were investigated and a simplified model for the autonomous flight control system design was constructed. System identification techniques as used in full-scale helicopters have been successfully applied to the micro coaxial unmanned helicopter. The essential parts of system identification include model theory, experimental data acquisition, parameter estimation, and model validations. The multivariable tracking and H2 control theory were employed to design a flight control system that would provide desired stability and performance for autonomous flight of a variety of maneuvers mentioned above. With a well-designed autonomous flight control system, the micro coaxial helicopter can be deployed for battle field awareness in battle fields, surveillance for search and rescue, border patrol, counter-terrorism operations, etc.

Flight Physics

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Author : Konstantin Volkov
language : en
Publisher: BoD – Books on Demand
Release Date : 2018-02-14

Flight Physics written by Konstantin Volkov and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-02-14 with Technology & Engineering categories.

The book focuses on the synthesis of the fundamental disciplines and practical applications involved in the investigation, description, and analysis of aircraft flight including applied aerodynamics, aircraft propulsion, flight performance, stability, and control. The book covers the aerodynamic models that describe the forces and moments on maneuvering aircraft and provides an overview of the concepts and methods used in flight dynamics. Computational methods are widely used by the practicing aerodynamicist, and the book covers computational fluid dynamics techniques used to improve understanding of the physical models that underlie computational methods.

Quad Rotorcraft Control

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Author : Luis Rodolfo García Carrillo
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-08-12

Quad Rotorcraft Control written by Luis Rodolfo García Carrillo and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-08-12 with Technology & Engineering categories.

Quad Rotorcraft Control develops original control methods for the navigation and hovering flight of an autonomous mini-quad-rotor robotic helicopter. These methods use an imaging system and a combination of inertial and altitude sensors to localize and guide the movement of the unmanned aerial vehicle relative to its immediate environment. The history, classification and applications of UAVs are introduced, followed by a description of modelling techniques for quad-rotors and the experimental platform itself. A control strategy for the improvement of attitude stabilization in quad-rotors is then proposed and tested in real-time experiments. The strategy, based on the use low-cost components and with experimentally-established robustness, avoids drift in the UAV’s angular position by the addition of an internal control loop to each electronic speed controller ensuring that, during hovering flight, all four motors turn at almost the same speed. The quad-rotor’s Euler angles being very close to the origin, other sensors like GPS or image-sensing equipment can be incorporated to perform autonomous positioning or trajectory-tracking tasks. Two vision-based strategies, each designed to deal with a specific kind of mission, are introduced and separately tested. The first stabilizes the quad-rotor over a landing pad on the ground; it extracts the 3-dimensional position using homography estimation and derives translational velocity by optical flow calculation. The second combines colour-extraction and line-detection algorithms to control the quad-rotor’s 3-dimensional position and achieves forward velocity regulation during a road-following task. In order to estimate the translational-dynamical characteristics of the quad-rotor (relative position and translational velocity) as they evolve within a building or other unstructured, GPS-deprived environment, imaging, inertial and altitude sensors are combined in a state observer. The text give the reader a current view of the problems encountered in UAV control, specifically those relating to quad-rotor flying machines and it will interest researchers and graduate students working in that field. The vision-based control strategies presented help the reader to a better understanding of how an imaging system can be used to obtain the information required for performance of the hovering and navigation tasks ubiquitous in rotored UAV operation.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1966

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 1966 with Aeronautics categories.

Helicopter Aerodynamics

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Author : RATHAKRISHNAN, E.
language : en
Publisher: PHI Learning Pvt. Ltd.
Release Date : 2018-11-01

Helicopter Aerodynamics written by RATHAKRISHNAN, E. and has been published by PHI Learning Pvt. Ltd. this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-11-01 with Technology & Engineering categories.

This book is developed to serve as a concise text for a course on helicopter aerodynamics at the introductory level. It introduces to the rotary-wing aerodynamics, with applications to helicopters, and application of the relevant principles to the aerodynamic design of a helicopter rotor and its blades. The basic aim of this book is to make a complete text covering both the basic and applied aspects of theory of rotary wing flying machine for students, engineers, and applied physicists. The philosophy followed in this book is that the subject of helicopter aerodynamics is covered combining the theoretical analysis, physical features and the application aspects. Considerable number of solved examples and exercise problems with answers are coined for this book. This book will cater to the requirement of numerical problems on helicopter flight performance, which is required for the students of aeronautical/aerospace engineering.. SALIENT FEATURES • To provide an introductory treatment of the aerodynamic theory of rotary-wing aircraft • To study the fundamentals of rotor aerodynamics for rotorcraft in hovering flight, axial flight, and forward flight modes • To perform blade element analysis, investigate rotating blade motion, and quantify basic helicopter performance

Aeronautical Engineering Index

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Author :
language : en
Publisher:
Release Date : 1954

Aeronautical Engineering Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1954 with Aeronautics categories.

Wind Tunnel Studies Of The Performance Of Multirotor Configurations

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Author : Richard C. Dingeldein
language : en
Publisher:
Release Date : 1954

Wind Tunnel Studies Of The Performance Of Multirotor Configurations 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 1954 with Rotors (Helicopters) categories.

The power requirements measured in static thrust and in level forward flight are presented for two helicopter rotor configurations. One is a coaxial rotor arrangement having the rotors spaced approximately 19 percent of the rotor radius; the other is a tandem configuration in which the rotor-shaft spacing is 3 percent greater than the rotor daimater and in which the rotors lie in the same plane. The experimental meausrements are compared with the results of calculations based on existing NACA single-rotor theory.

Helicopter Engineering

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Author : Lalit Gupta
language : en
Publisher:
Release Date :

Helicopter Engineering written by Lalit Gupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with categories.