Author: James Chen-yuan Wu
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages :

Get Book Here

Book Description

Author: James C. Wu
Publisher:
ISBN:
Category : Lifting bodies (Aeronautics)
Languages : en
Pages : 84

Get Book Here

Book Description

Author: James Chen-yuan Wu
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 0

Get Book Here

Book Description
This report describes the research effort carried out under AFOSR Grant 86-0121. Two new unified theoretical-computational methods for analyzing unsteady aerodynamics involving rapid large amplitude motion of lifting bodies are described. One method is based on the zonal solution of the full Navier-Stokes equation and the other method is a simplified zonal method. Selected results are presented for two-dimensional rigid, articulate and flexible lifting bodies. Preliminary results for three-dimensional problems are also presented. Unsteady aerodynamics, Supermaneuverability. (EG).

Author: Earl H. Dowell
Publisher: Springer Science & Business Media
ISBN: 1461239087
Category : Science
Languages : en
Pages : 469

Get Book Here

Book Description
The great bulk of the literature on aeroelasticity is devoted to linear models. The oretical work relies heavily on linear mathematical concepts, and experimental results are commonly interpreted by assuming that the physical model behaves in a linear manner. Nevertheless, significant work has been done in nonlinear aero elasticity, and one may expect this trend to accelerate for several reasons: our ability to compute has increased at an astonishing rate; as linear concepts have been assimilated widely, there is a natural increase in interest in the foundations of nonlinear modeling; and, finally, some phenomena long recognized to be of interest, but beyond the effective range of linear models, are now known to be essentially nonlinear in nature. In this volume, an exhaustive review of the literature is not attempted. Rather the emphasis is on fundamental ideas and a representative selection of problems. Despite obvious successes in research on problems of aeroelasticity and the existence of a broad literature, including a number of excellent monographs, up to now little attention has been devoted to a general nonlinear theory of interac tion. For the most part nonlinearity has been considered either solely in the description of the behavior of a shell or in the description of the motion of a gas.

Author: Grigorios Dimitriadis
Publisher:
ISBN: 9781118756478
Category : Aeroelasticity
Languages : en
Pages :

Get Book Here

Book Description
Introduces the latest developments and technologies in the area of nonlinear aeroelasticity Nonlinear aeroelasticity has become an increasingly popular research area in recent years. There have been many driving forces behind this development, increasingly flexible structures, nonlinear control laws, materials with nonlinear characteristics, etc. Introduction to Nonlinear aeroelasticity covers the theoretical basics in nonlinear aeroelasticity and applies the theory to practical problems. As nonlinear aeroelasticity is a combined topic, necessitating expertise from different areas, the book introduces methodologies from a variety of disciplines such as nonlinear dynamics, bifurcation analysis, unsteady aerodynamics, non-smooth systems and others. The emphasis throughout is on the practical application of the theories and methods, so as to enable the reader to apply their newly acquired knowledge. Key features: -Covers the major topics in nonlinear aeroelasticity, from the galloping of cables to supersonic panel flutter.-Discusses nonlinear dynamics, bifurcation analysis, numerical continuation, unsteady aerodynamics and non-smooth systems.-Considers the practical application of the theories and methods.-Covers nonlinear dynamics, bifurcation analysis and numerical methods.-Accompanied by a website hosting Matlab code. Introduction to Nonlinear aeroelasticity is a comprehensive reference for researchers and workers in industry and is also a useful introduction to the subject for graduate and undergraduate students across engineering disciplines.

Author: James C. Wu
Publisher: Springer
ISBN: 3662440407
Category : Technology & Engineering
Languages : en
Pages : 147

Get Book Here

Book Description
This book opens with a discussion of the vorticity-dynamic formulation of the low Mach number viscous flow problem. It examines the physical aspects of the velocity and the vorticity fields, their instantaneous relationship, and the transport of vorticity in viscous fluids for steady and unsteady flows. Subsequently, using classical analyses it explores the mathematical aspects of vorticity dynamics and issues of initial and boundary conditions for the viscous flow problem. It also includes the evolution of the vorticity field which surrounds and trails behind airfoils and wings, generalizations of Helmholtz’ vortex theorems and the Biot-Savart Law. The book introduces a theorem that relates the aerodynamic force to the vorticity moment and reviews the applications of the theorem. Further, it presents interpretations of the Kutta-Joukowski theorem and Prandtl’s lifting line theory for vorticity dynamics and discusses wake integral methods. The virtual-mass effect is shown to be the seminal event in unsteady aerodynamics and a simple approach for evaluating virtual-mass forces on the basis of vorticity dynamics is presented. The book presents a modern viewpoint on vorticity dynamics as the framework for understanding and establishing the fundamental principles of viscous and unsteady aerodynamics. It is intended for graduate-level students of classical aerodynamics and researchers exploring the frontiers of fully unsteady and non-streamlined aerodynamics.

Author: Robert J. S. Simpson
Publisher:
ISBN:
Category :
Languages : en
Pages :

Get Book Here

Book Description

Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 456

Get Book Here

Book Description
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.

Author: Ülgen Gülçat
Publisher: Springer Science & Business Media
ISBN: 3642147615
Category : Technology & Engineering
Languages : en
Pages : 348

Get Book Here

Book Description
In this textbook, the author introduces the concept of unsteady aerodynamics and its underlying principles. He provides the readers with a full review of fundamental physics of the free and the forced unsteadines, the terminology and basic equations of aerodynamics ranging from incompressible flow to hypersonics. The book also covers the modern topics concerning the developments made during the last years, especially in relation to wing flappings for propulsion. The book is written for graduate and senior year undergraduate students in Aerodynamics, and it serves as a reference for experienced researchers. Each chapter includes ample examples, questions, problems and relevant references.

Author: Bengt Winzell
Publisher:
ISBN:
Category :
Languages : en
Pages : 10

Get Book Here

Book Description
Results of unsteady linear and full potential theory are used for analysis of wings and aircraft configurations. In particular the details of unsteady pressure distributions at the trailing edge are investigated aiming at better representation of control surface hinge moments. The importance of viscous effects are observed and a comparison between potential theory and Navier-Stokes predictions is made.