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An Integrated Optimum Design Approach For High Speed Prop Rotors
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722194918 Total Pages :92 pages Book Rating :4.1/5 (949 download)
Book Synopsis An Integrated Optimum Design Approach for High Speed Prop Rotors by : National Aeronautics and Space Administration (NASA)
Download or read book An Integrated Optimum Design Approach for High Speed Prop Rotors written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective is to develop an optimization procedure for high-speed and civil tilt-rotors by coupling all of the necessary disciplines within a closed-loop optimization procedure. Both simplified and comprehensive analysis codes are used for the aerodynamic analyses. The structural properties are calculated using in-house developed algorithms for both isotropic and composite box beam sections. There are four major objectives of this study. (1) Aerodynamic optimization: The effects of blade aerodynamic characteristics on cruise and hover performance of prop-rotor aircraft are investigated using the classical blade element momentum approach with corrections for the high lift capability of rotors/propellers. (2) Coupled aerodynamic/structures optimization: A multilevel hybrid optimization technique is developed for the design of prop-rotor aircraft. The design problem is decomposed into a level for improved aerodynamics with continuous design variables and a level with discrete variables to investigate composite tailoring. The aerodynamic analysis is based on that developed in objective 1 and the structural analysis is performed using an in-house code which models a composite box beam. The results are compared to both a reference rotor and the optimum rotor found in the purely aerodynamic formulation. (3) Multipoint optimization: The multilevel optimization procedure of objective 2 is extended to a multipoint design problem. Hover, cruise, and take-off are the three flight conditions simultaneously maximized. (4) Coupled rotor/wing optimization: Using the comprehensive rotary wing code CAMRAD, an optimization procedure is developed for the coupled rotor/wing performance in high speed tilt-rotor aircraft. The developed procedure contains design variables which define the rotor and wing planforms. Chattopadhyay, Aditi and Mccarthy, Thomas R. Unspecified Center...
Book Synopsis Optimum Design of High-Speed Prop-Rotors by : National Aeronautics and Space Adm Nasa
Download or read book Optimum Design of High-Speed Prop-Rotors written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-10 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: An integrated multidisciplinary optimization procedure is developed for application to rotary wing aircraft design. The necessary disciplines such as dynamics, aerodynamics, aeroelasticity, and structures are coupled within a closed-loop optimization process. The procedure developed is applied to address two different problems. The first problem considers the optimization of a helicopter rotor blade and the second problem addresses the optimum design of a high-speed tilting proprotor. In the helicopter blade problem, the objective is to reduce the critical vibratory shear forces and moments at the blade root, without degrading rotor aerodynamic performance and aeroelastic stability. In the case of the high-speed proprotor, the goal is to maximize the propulsive efficiency in high-speed cruise without deteriorating the aeroelastic stability in cruise and the aerodynamic performance in hover. The problems studied involve multiple design objectives; therefore, the optimization problems are formulated using multiobjective design procedures. A comprehensive helicopter analysis code is used for the rotary wing aerodynamic, dynamic and aeroelastic stability analyses and an algorithm developed specifically for these purposes is used for the structural analysis. A nonlinear programming technique coupled with an approximate analysis procedure is used to perform the optimization. The optimum blade designs obtained in each case are compared to corresponding reference designs. Chattopadhyay, Aditi and McCarthy, Thomas Robert Ames Research Center...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781725100657 Total Pages :26 pages Book Rating :4.1/5 (6 download)
Book Synopsis An Integrated Optimum Design Approach for High Speed Prop-Rotors Including Acoustic Constraints by : National Aeronautics and Space Administration (NASA)
Download or read book An Integrated Optimum Design Approach for High Speed Prop-Rotors Including Acoustic Constraints written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research is to develop optimization procedures to provide design trends in high speed prop-rotors. The necessary disciplinary couplings are all considered within a closed loop multilevel decomposition optimization process. The procedures involve the consideration of blade-aeroelastic aerodynamic performance, structural-dynamic design requirements, and acoustics. Further, since the design involves consideration of several different objective functions, multiobjective function formulation techniques are developed. Chattopadhyay, Aditi and Wells, Valana and Mccarthy, Thomas and Han, Arris Unspecified Center NASA-CR-193222, NAS 1.26:193222 NCC2-795...
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781792716652 Total Pages :30 pages Book Rating :4.7/5 (166 download)
Book Synopsis Optimum Design of High Speed Prop Rotors Including the Coupling of Performance, Aeroelastic Stability and Structures by : National Aeronautics and Space Adm Nasa
Download or read book Optimum Design of High Speed Prop Rotors Including the Coupling of Performance, Aeroelastic Stability and Structures written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-12-29 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: An optimization procedure is developed for the design of high speed prop-rotors to be used in civil tiltrotor applications. The goal is to couple aerodynamic performance, aeroelastic stability, and structural design requirements inside a closed-loop optimization procedure. The objective is to minimize the gross weight and maximize the propulsive efficiency in high speed cruise. Constraints are imposed on the rotor aeroelastic stability in both hover and cruise and rotor figure of merit in hover. Both structural and aerodynamic design variables are used. Chattopadhyay, Aditi and Mccarthy, Thomas R. and Madden, John F., III Ames Research Center NAG2-771...
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Book Synopsis A Multiple Design Point Optimization of High Speed Prop-rotors by : Aditi Chattopadhyay
Download or read book A Multiple Design Point Optimization of High Speed Prop-rotors written by Aditi Chattopadhyay and published by . This book was released on 1994 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Multilevel Decomposition Approach to Integrated Aerodynamic/dynamic/structural Optimization of Helicopter Rotor Blades by :
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:
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Book Synopsis Integrated Aerodynamic/dynamic/structural Optimization of Helicopter Rotor Blades Using Multilevel Decomposition by :
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