Analysis Of Structures With Rotating Flexible Substructures Applied To Rotorcraft Aeroelasticity In Grasp General Rotorcraft Aeromechanical Stability Program
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Analysis Of Structures With Rotating Flexible Substructures Applied To Rotorcraft Aeroelasticity In Grasp General Rotorcraft Aeromechanical Stability Program
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Author : Dewey H. Hodges
language : en
Publisher:
Release Date : 1987
Analysis Of Structures With Rotating Flexible Substructures Applied To Rotorcraft Aeroelasticity In Grasp General Rotorcraft Aeromechanical Stability Program written by Dewey H. Hodges and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
The initial version of the General Rotorcraft Aeromechanical Stability Program (GRASP) was developed for analysis of rotorcraft in steady, axial flight and ground contact conditions. In these flight regimes, the material continua of the rotorcraft may experience deformations which are independent of time. GRASP can obtain this steady-state solution and can solve the eigenproblem associated with perturbations about such a steady-state solution. GRASP is the first program implementing a new method for dynamic analysis of structures, parts of which may be experiencing discrete motion relative to other parts. Application of this new method to GRASP, including substructuring, frames of reference, nodes, finite elements and constraints, is described in the paper. The library of finite elements includes a powerful nonlinear beam element that incorporates aeroelastic effects based on a simple nonlinear, aerodynamic theory with unsteady induced inflow.
General Rotorcraft Aeromechanical Stability Program Grasp Theory Manual
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Author :
language : en
Publisher:
Release Date : 1990
General Rotorcraft Aeromechanical Stability Program Grasp Theory Manual written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Aeroelasticity categories.
General Rotorcraft Aeromechanical Stability Program Grasp
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-17
General Rotorcraft Aeromechanical Stability Program Grasp written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-17 with categories.
The general rotorcraft aeromechanical stability program (GRASP) was developed to calculate aeroelastic stability for rotorcraft in hovering flight, vertical flight, and ground contact conditions. GRASP is described in terms of its capabilities and its philosophy of modeling. The equations of motion that govern the physical system are described, as well as the analytical approximations used to derive them. The equations include the kinematical equation, the element equations, and the constraint equations. In addition, the solution procedures used by GRASP are described. GRASP is capable of treating the nonlinear static and linearized dynamic behavior of structures represented by arbitrary collections of rigid-body and beam elements. These elements may be connected in an arbitrary fashion, and are permitted to have large relative motions. The main limitation of this analysis is that periodic coefficient effects are not treated, restricting rotorcraft flight conditions to hover, axial flight, and ground contact. Instead of following the methods employed in other rotorcraft programs. GRASP is designed to be a hybrid of the finite-element method and the multibody methods used in spacecraft analysis. GRASP differs from traditional finite-element programs by allowing multiple levels of substructure in which the substructures can move and/or rotate relative to others with no small-angle approximations. This capability facilitates the modeling of rotorcraft structures, including the rotating/nonrotating interface and the details of the blade/root kinematics for various types. GRASP differs from traditional multibody programs by considering aeroelastic effects, including inflow dynamics (simple unsteady aerodynamics) and nonlinear aerodynamic coefficients. Hodges, Dewey H. and Hopkins, A. Stewart and Kunz, Donald L. and Hinnant, Howard E. Ames Research Center AERODYNAMIC STABILITY; AEROELASTICITY; DYNAMIC STRUCTURAL ANALYSIS; FINITE ELEMENT METHOD; HOVERING; ROTARY WING AIRCR...
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1991
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.
Nasa S Contributions To Aeronautics Aerodynamics Structures Propulsion Controls
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Author :
language : en
Publisher:
Release Date : 2010
Nasa S Contributions To Aeronautics Aerodynamics Structures Propulsion Controls written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Aeronautics categories.
Two-volume collection of case studies on aspects of NACA-NASA research by noted engineers, airmen, historians, museum curators, journalists, and independent scholars. Explores various aspects of how NACA-NASA research took aeronautics from the subsonic to the hypersonic era.-publisher description.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1987-07
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987-07 with Science categories.
Nasa S Contributions To Aeronautics
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Author :
language : en
Publisher:
Release Date : 2010
Nasa S Contributions To Aeronautics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Aeronautics categories.
A Collection Of Technical Papers
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Author :
language : en
Publisher:
Release Date : 1987
A Collection Of Technical Papers written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Materials categories.
General Rotorcraft Aeromechanical Stability Program Grasp Version 1 03 User S Manual
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Author : A. Stewart Hopkins
language : en
Publisher:
Release Date : 1988
General Rotorcraft Aeromechanical Stability Program Grasp Version 1 03 User S Manual written by A. Stewart Hopkins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
The Rotorcraft Dynamics Division, Aeroflightdynamics Directorate, U.S. Army Aviation Research and Technology Activity has developed the General Rotorcraft Aeromechanical Stability Program (GRASP) to perform calculations that will assess the stability of rotorcraft in hovering flight and ground contact conditions. This computer program is designed to be a state-of-the-art, hybrid, finite-element/multibody code that can be applied to all existing and future helicopter configurations. While GRASP was specifically designed to solve rotorcraft stability problems, its innovative structure and formulation allow for applications to a wide range of structures. This manual describes the preparation of the input file required by Version 1.03 of GRASP, the procedures used to invoke GRASP on the NASA Ames Research Center Cray X-MP 48 computer, and the interpretation of the output produced by GRASP. The parameters used by the input file are defined, and summaries of the input file and the job control language are included. Keywords: Aeroelasticity; Rotary wings.
Structural Dynamics And Aeroelasticity
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Author : Ahmed Khairy Noor
language : en
Publisher:
Release Date : 1993
Structural Dynamics And Aeroelasticity written by Ahmed Khairy Noor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Aeroelasticity categories.