Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 36
Book Description
A Historical Overview of Tiltrotor Aeroelastic Research at Langley Research Center
Author: A Historical Overview of Aeroelasticity Branch and Transonic Dynamics Tunnel Contributions to Rotorcraft Technology and Development
Author: Publisher: DIANE Publishing
ISBN: 1428995803
Category :
Languages : en
Pages : 115
Book Description
Exploratory Studies in Generalized Predictive Control for Active Aeroelastic Control of Tiltrotor Aircraft
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781720520252
Category :
Languages : en
Pages : 38
Book Description
The Aeroelasticity Branch at NASA Langley Research Center has a long and substantive history of tiltrotor aeroelastic research. That research has included a broad range of experimental investigations in the Langley Transonic Dynamics Tunnel (TDT) using a variety of scale models and the development of essential analyses. Since 1994, the tiltrotor research program has been using a 1/5-scale, semispan aeroelastic model of the V-22 designed and built by Bell Helicopter Textron Inc. (BHTI) in 1981. That model has been refurbished to form a tiltrotor research testbed called the Wing and Rotor Aeroelastic Test System (WRATS) for use in the TDT. In collaboration with BHTI, studies under the current tiltrotor research program are focused on aeroelastic technology areas having the potential for enhancing the commercial and military viability of tiltrotor aircraft. Among the areas being addressed, considerable emphasis is being directed to the evaluation of modern adaptive multi-input multi- output (MIMO) control techniques for active stability augmentation and vibration control of tiltrotor aircraft. As part of this investigation, a predictive control technique known as Generalized Predictive Control (GPC) is being studied to assess its potential for actively controlling the swashplate of tiltrotor aircraft to enhance aeroelastic stability in both helicopter and airplane modes of flight. This paper summarizes the exploratory numerical and experimental studies that were conducted as part of that investigation.Kvaternik, Raymond G. and Juang, Jer-Nan and Bennett, Richard L.Langley Research CenterCONTROL SYSTEMS DESIGN; ACTIVE CONTROL; HELICOPTERS; AEROELASTICITY; AIRCRAFT CONTROL; MIMO (CONTROL SYSTEMS); STABILITY AUGMENTATION; V-22 AIRCRAFT; VIBRATION DAMPING
A Historical Overview of Aeroelasticity Branch and Transonic Dynamics Tunnel Contributions to Rotorcraft Technology and Development
Author: A Historical Overview of Aeroelasticity Branch and Transonic Dynamics Tunnel Contributions to Rotorcraft Technology and Development
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781721101245
Category :
Languages : en
Pages : 116
Book Description
A historical account of the contributions of the Aeroelasticity Branch (AB) and the Langley Transonic Dynamics Tunnel (TDT) to rotorcraft technology and development since the tunnel's inception in 1960 is presented. The paper begins with a summary of the major characteristics of the TDT and a description of the unique capability offered by the TDT for testing aeroelastic models by virtue of its heavy gas test medium. This is followed by some remarks on the role played by scale models in the design and development of rotorcraft vehicles and a review of the basic scaling relationships important for designing and building dynamic aeroelastic models of rotorcraft vehicles for testing in the TDT. Chronological accounts of helicopter and tiltrotor research conducted in AB/TDT are then described in separate sections. Both experimental and analytical studies are reported and include a description of the various physical and mathematical models employed, the specific objectives of the investigations, and illustrative experimental and analytical results. Yeager, William T., Jr. and Kvaternik, Raymond G. Langley Research Center RTOP 712-20-21-01
Exploratory Studies in Generalized Predictive Control for Active Aeroelastic Control of Tiltrotor Aircraft
Author: Publisher: DIANE Publishing
ISBN: 1428996265
Category :
Languages : en
Pages : 37
Book Description
The History of the XV-15 Tilt Rotor Research Aircraft
Author: Martin D. MaiselPublisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 222
Book Description
Exploratory studies in generalized predictive control for active aeroelastic control of tiltrotor aircraft
Author: Raymond G. KvaternikCEAS/AIAA/ICASE/NASA Langley International Forum on Aeroelasticity and Structural Dynamics 1999
Author: Publisher:
ISBN:
Category : Aeroelasticity
Languages : en
Pages : 460
Book Description
These proceedings represent a collection of the latest advances in aeroelasticity and structural dynamics from the world community. Research in the areas of unsteady aerodynamics and aeroelasticity, structural modeling and optimazation, active control and adaptive structures, landing dynamics, certification and qualification, and validation testing are highlighted in the collection of papers. The wide range of results will lead to advances in the prediction and control of the structural response of aircraft and spacecraft.
Whirl Flutter of Turboprop Aircraft Structures
Author: Jiří ČečrdlePublisher: Elsevier
ISBN: 0323955568
Category : Technology & Engineering
Languages : en
Pages : 378
Book Description
Whirl Flutter of Turboprop Aircraft Structures, Second Edition explores the whirl flutter phenomenon, including theoretical, practical, analytical and experimental aspects of the matter. Sections provide a general overview regarding aeroelasticity, discussions on the physical principle and the occurrence of whirl flutter in aerospace practice, and experimental research conducted, especially from the 60s. Other chapters delve into analytical methods such as basic and advanced linear models, non-linear and CFD based methods, certification issues including regulation requirements, a description of possible certification approaches, and several examples of aircraft certification from aerospace. Finally, a database of relevant books, reports and papers is provided. This updated and expanded second edition covers new chapters including both analytical and experimental aspects of the subject matter. - Provides complex information on turboprop aircraft whirl flutter phenomenon - Presents both theoretical and practical (certification related) issues - Includes experimental research as well as analytical models (basic and advanced) of matter - Includes both early-performed works and recent developments - Contains a listing of relevant books and reports