Download or read book Eigenspace Design of Helicopter Flight Control Systems written by and published by . This book was released on 1990 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: An eigenstructure based design methodology for helicopter flight control systems is developed and evaluated in this report. The report provides a detailed review of the application of multivariable design techniques to helicopter flight control systems, a review of applicable handling quality specifications, a description of the mathematical models used, a presentation of the theory of eigenstructure design, application of the theory to a helicopter design problem, and evaluation of the performance and robustness properties of the resulting control laws.

Download or read book Modeling Control and Coordination of Helicopter Systems written by Beibei Ren and published by Springer Science & Business Media. This book was released on 2012-02-02 with total page 243 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling, Control and Coordination of Helicopter Systems provides a comprehensive treatment of helicopter systems, ranging from related nonlinear flight dynamic modeling and stability analysis to advanced control design for single helicopter systems, and also covers issues related to the coordination and formation control of multiple helicopter systems to achieve high performance tasks. Ensuring stability in helicopter flight is a challenging problem for nonlinear control design and development. This book is a valuable reference on modeling, control and coordination of helicopter systems,providing readers with practical solutions for the problems that still plague helicopter system design and implementation. Readers will gain a complete picture of helicopters at the systems level, as well as a better understanding of the technical intricacies involved.

Download or read book Design of Helicopter Flight Control Systems for Hover and Low Speed Using Eigenstructure Assignment written by Eicher Low and published by . This book was released on 1991 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Helicopter Flight Control System Design Using the Linear Quadratic Regulator for Robust Eigenstructure Assignment written by Dempsey D. Solomon (CAPT, USA.) and published by . This book was released on 1992 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Linear and Nonlinear Control of Small Scale Unmanned Helicopters written by Ioannis A. Raptis and published by Springer Science & Business Media. This book was released on 2010-09-28 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Foundations of Helicopter Flight written by S. Newman and published by Elsevier. This book was released on 1994-04-07 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: The unique design problems which helicopters produce are many and complex. Through practical examples and illustrated case studies, supported by all the relevant theory, this primer text provides an accessible introduction which guides the reader through the theory, design, construction and operation of helicopters. Fundamental performance and control equations are developed, from which the book explores the rotor aerodynamic and dynamic characteristics of helicopters. Example calculations and performance predictions, reflecting current practice, show how to assess the feasibility of a design. * Tackles the theory, design, construction and operation of helicopters* Illustrated with many practical examples and case studies* Provides the fundamental equations describing performance and dynamic behaviour

Download or read book Practical Optimal Flight Control System Design for Helicopter Aircraft Volume 1 Technical Report written by L. G. Hofmann and published by . This book was released on 1980 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design of a Multivariable Helicopter Flight Control System for Handling Qualities Enhancement written by and published by . This book was released on 1990 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: New handling qualities specifications are currently being developed for attack helicopters. Most unaugmented helicopters will not meet these specifications and feedback control is necessary to improve handling qualities so that safe operation close to the earth in poor weather conditions and/or at night is possible. In this paper a methodology for the direct design of helicopter flight control systems which meet handling qualities specifications is presented. This methodology uses full state feedback to place closed loop eigenvalues to achieve bandwidth specifications and to shape closed loop eigenvectors to decouple lateral and longitudinal responses to control inputs. Full state feedback requires that all state variables be known; however, only angular rates and normal acceleration are measured by sensors. Thus, a state estimator is required in the feedback loop in order to convert sensor outputs to control inputs. This estimator is designed using eigenstructure assignment so as to achieve loop transfer recovery. Design of a feedback system for use in precise hovering control for a modern attack helicopter is used to illustrate the method. Control law synthesis is accomplished using an eighth order model which includes only rigid body modes. Control law performance is evaluated using a 37th order model which includes rigid body, actuator, rotor, sensor, and flexure dynamics. It is found that a notch filter must be added to the design in order to eliminate a high frequency instability. Once this is accomplished, both the time and frequency response characteristics of the augmented helicopter are much improved compared with the unaugmented helicopter.

Download or read book Design of Helicopter Automatic Flight Control System written by Daniel P. Schrage and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Micro Coaxial Helicopter Controller Design written by Zelimir Husnic and published by . This book was released on 2015 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Design of a Helicopter Automatic Flight Control System Using Adaptive Control written by Philip Matthew Fitzsimons and published by . This book was released on 1989 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Helicopter Flight Control System Design Using Sliding Mode Theory written by David James McGeoch and published by . This book was released on 2005 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Principles of Helicopter Flight Dynamics written by Yihua Cao and published by . This book was released on 2009 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight dynamics create important research problems in the process of helicopter design. They involve advanced design ideas and engineering technology theories. This book concerns flight theory and research methods for helicopter flight science and technology. The contents include the fundamentals of rotor aerodynamics, helicopter trim, helicopter stability and control, and helicopter performance analyses. The book also lokks at the kinematics, dynamics, control, and aerodynamics of the helicopter during maneuvering flight. With an emphasis on the physical concepts, the characteristics of rotor flapping, theoretical analyses and numerical simulation methods for helicopter flight mechanics are detail described in detail. The book is primarily intended for senior undergraduates and postgraduates who major in aerospace engineering. It is also a good reference book for helicopter engineers interested design and operational engineering. It lays a foundation for the study of helicopter aeromechanics.

Download or read book A Modern Control Design Methodology with Application to the CH 47 Helicopter written by Richard D. Holdridge and published by . This book was released on 1985 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: A control system design methodology is developed in this dissertation which produces robust, low-order optimal controllers for multiple-input multiple-output systems. The methodology attempts to focus the strengths of recent 'Modern Control' design algorithms on the problems associated with real control system designs. The methodology is a set of procedures which aids the engineer in creating a realizable controller in either digital or analog form. To demonstrate the usefulness of the methodology, two control augmentation systems (CAS) were designed and flight tested on a CH-47 helicopter at NASA Ames Research Center. The first design was a longitudinal cruise CAS giving the pilot decoupled control of forward velocity and climb rate. This design task demonstrated the low-order controller and robustness features of the methodology. It also demonstrated the use of modern control techniques in designing integral-error controllers. Flight test results are presented. The second controller is a translational velocity command/precision hover hold system. This two mode controller demonstrates the methodology as applied to a more complicated design task which includes control law switching and inner loop/outer loop considerations. Flight test results are also presented. Originator-supplied keywords include: Thesis.

Download or read book Design of a Helicopter Autopilot by Means of Linearizing Transformations written by and published by . This book was released on 1982 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of Helicopter Stability and Control Including Blade Dynamics 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 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: A linearized model of rotorcraft dynamics has been developed through the use of symbolic automatic equation generating techniques. The dynamic model has been formulated in a unique way such that it can be used to analyze a variety of rotor/body coupling problems including a rotor mounted on a flexible shaft with a number of modes as well as free-flight stability and control characteristics. Direct comparison of the time response to longitudinal, lateral and directional control inputs at various trim conditions shows that the linear model yields good to very good correlation with flight test. In particular it is shown that a dynamic inflow model is essential to obtain good time response correlation, especially for the hover trim condition. It also is shown that the main rotor wake interaction with the tail rotor and fixed tail surfaces is a significant contributor to the response at translational flight trim conditions. A relatively simple model for the downwash and sidewash at the tail surfaces based on flat vortex wake theory is shown to produce good agreement. Then, the influence of rotor flap and lag dynamics on automatic control systems feedback gain limitations is investigated with the model. It is shown that the blade dynamics, especially lagging dynamics, can severly limit the useable values of the feedback gain for simple feedback control and that multivariable optimal control theory is a powerful tool to design high gain augmentation control system. The frequency-shaped optimal control design can offer much better flight dynamic characteristics and a stable margin for the feedback system without need to model the lagging dynamics. Zhao, Xin and Curtiss, H. C., Jr. Unspecified Center BLADES; HELICOPTER CONTROL; ROTOR AERODYNAMICS; STABILITY; CONTROL SYSTEMS DESIGN; HOVERING; ROTOR BODY INTERACTIONS; TRANSLATIONAL MOTION...

Download or read book Design and Analysis of an Active Jet Control System for Helicopter Sling Loads written by Mark D. Pardue and published by . This book was released on 1979 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: