Download or read book Structural Optimization of Rotor Blades with Integrated Dynamics and Aerodynamics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of structural optimization of helicopter rotor blades with integrated dynamic and aerodynamic design considerations is addressed. Results of recent optimization work on rotor blades for minimum weight with constraints on multiple coupled natural flap-lag frequencies, blade autorotational inertia and centrifugal stress has been reviewed. A strategy has been defined for the ongoing activities in the integrated dynamic/aerodynamic optimization of rotor blades. As a first step, the integrated dynamic/airload optimization problem has been formulated. To calculate system sensitivity derivatives necessary for the optimization recently developed, Global Sensitivity Equations (GSE) are being investigated. A need for multiple objective functions for the integrated optimization problem has been demonstrated and various techniques for solving the multiple objective function optimization are being investigated. The method called the Global Criteria Approach has been applied to a test problem with the blade in vacuum and the blade weight and the centrifugal stress as the multiple objectives. The results indicate that the method is quite effective in solving optimization problems with conflicting objective functions. Chattopadhyay, Aditi and Walsh, Joanne L. Langley Research Center RTOP 505-63-51-10...
Download or read book Structural Optimization of Rotor Blades with Integrated Dynamics and Aerodynamics written by and published by . This book was released on 1988 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrated Aerodynamic Dynamic Structural Optimization of Helicopter Rotor Blades Using Multilevel Decomposition written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-10-28 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes an integrated aerodynamic/dynamic/structural (IADS) optimization procedure for helicopter rotor blades. The procedure combines performance, dynamics, and structural analyses with a general-purpose optimizer using multilevel decomposition techniques. At the upper level, the structure is defined in terms of global quantities (stiffness, mass, and average strains). At the lower level, the structure is defined in terms of local quantities (detailed dimensions of the blade structure and stresses). The IADS procedure provides an optimization technique that is compatible with industrial design practices in which the aerodynamic and dynamic designs are performed at a global level and the structural design is carried out at a detailed level with considerable dialog and compromise among the aerodynamic, dynamic, and structural groups. The IADS procedure is demonstrated for several examples. Walsh, Joanne L. and Young, Katherine C. and Pritchard, Jocelyn I. and Adelman, Howard M. and Mantay, Wayne R. Langley Research Center...
Download or read book Integration of Dynamic Aerodynamic and Structural Optimization of Helicopter Rotor Blades written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-31 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summarized here is the first six years of research into the integration of structural, dynamic, and aerodynamic considerations in the design-optimization process for rotor blades. Specifically discussed here is the application of design optimization techniques for helicopter rotor blades. The reduction of vibratory shears and moments at the blade root, aeroelastic stability of the rotor, optimum airframe design, and an efficient procedure for calculating system sensitivities with respect to the design variables used are discussed. Peters, David A. NASA-CR-189018, NAS 1.26:189018 NAG1-710...
Download or read book Integration of Dynamic Aerodynamic and Structural Optimization of Helicopter Rotor Blades written by David A. Peters 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 Integrated Aerodynamic dynamic structural Optimization of Helicopter Rotor Blades Using Multilevel Decomposition written by and published by . This book was released on 1995 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multilevel Decomposition Approach to Integrated Aerodynamic dynamic structural Optimization of Helicopter Rotor Blades written by and published by . This book was released on 1994 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Advances in Multidisciplinary Analysis and Optimization written by and published by . This book was released on 1989 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrated Multidisciplinary Design Optimization of Rotorcraft written by Howard M. Adelman and published by . This book was released on 1989 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrated Aerodynamic dynamic Optimization of Helicopter Rotor Blades written by and published by . This book was released on 1989 with total page 18 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 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Fully Integrated Aerodynamic dynamic Optimization of Helicopter Rotor Blades written by and published by . This book was released on 1992 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Advances in Multidisciplinary Optimization of Rotorcraft written by and published by . This book was released on 1992 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Integrated Aerodynamic Dynamic Optimization of Helicopter Rotor Blades written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-29 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: An integrated aerodynamic/dynamic optimization procedure is used to minimize blade weight and 4 per rev vertical hub shear for a rotor blade in forward flight. The coupling of aerodynamics and dynamics is accomplished through the inclusion of airloads which vary with the design variables during the optimization process. Both single and multiple objective functions are used in the optimization formulation. The Global Criteria Approach is used to formulate the multiple objective optimization and results are compared with those obtained by using single objective function formulations. Constraints are imposed on natural frequencies, autorotational inertia, and centrifugal stress. The program CAMRAD is used for the blade aerodynamic and dynamic analyses, and the program CONMIN is used for the optimization. Since the spanwise and the azimuthal variations of loading are responsible for most rotor vibration and noise, the vertical airload distributions on the blade, before and after optimization, are compared. The total power required by the rotor to produce the same amount of thrust for a given area is also calculated before and after optimization. Results indicate that integrated optimization can significantly reduce the blade weight, the hub shear and the amplitude of the vertical airload distributions on the blade and the total power required by the rotor. Chattopadhyay, Aditi and Walsh, Joanne L. and Riley, Michael F. Langley Research Center NASA-TM-101553, NAS 1.15:101553, AIAA PAPER 89-1269 RTOP 505-61-51-10...
Download or read book Integrated Aerodynamic dynamic structural Optimization of Helicopter Rotor Bades Using Multi level Decomposition written by Joanne L. Walsh and published by . This book was released on 1995 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1990-11 with total page 1432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1990 with total page 1430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
