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 A Robust Rotorcraft Flight Control System Design Methodology Utilizing Quantitative Feedback Theory written by Peter James Gorder and published by . This book was released on 1993 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Research in Progress written by and published by . This book was released on 1988 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Techniques for the Tuning of Helicopter Multivariable Flight Control Systems and Handling Qualities written by Michael Arnold Manness and published by . This book was released on 1988 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP written by and published by . This book was released on 1992 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrated Flight propulsion Control with Variable Rotor Speed Command for Rotorcraft written by Stanford University. Department of Aeronautics and Astronautics and published by . This book was released on 1996 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Journal of the American Helicopter Society written by American Helicopter Society and published by . This book was released on 1999 with total page 344 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 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pacific International Conference on Aerospace Science and Technology written by and published by . This book was released on 1994 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Synthesis of a Reduced Order Model and Design of a Multivariable Flight Control System for a High Performance Helicopter written by Mark Ekblad and published by . This book was released on 1988 with total page 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 92 4414 to 92 4549 written by and published by . This book was released on 1992 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Helicopter Flight Control Research written by S. L. Buckingham and published by . This book was released on 1986 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Piloted simulation has been in use at RAE Bedford as a powerful tool for research in helicopter handling qualities since 1970. The most recent studies have addressed the application of advanced control systems to enhance agility in Nap of the Earth (NOE) flight. Handling qualities research places particular demands on many components of the simulator, including software environment and computing, cockpit design and simulator operation. The requirements in terms of provision of adequate visual and motion cues are especially severe for agile NOE flight. In this Memorandum, the history of helicopter simulation at Bedford is described. The lessons which have been learned, and the special requirements which have been identified, are discussed. Finally, the new Advanced Flight Simulator (AFS), due to enter service at Bedford during 1985 is reviewed from the perspective of helicopter handling qualities research. Keywords: Flight control research.
Download or read book NASA Scientific and Technical Publications written by and published by . This book was released on 1987 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt:
