Earl H Dowell's Books

Asymptotic Modal Analysis of Structural and Acoustical Systems

By: Shung Sung,Dean Culver,Donald Nefske,Earl Dowell

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Asymptotic Modal Analysis of Structural and Acoustical Systems

By: Shung Sung,Dean Culver,Donald Nefske,Earl Dowell

This book describes the Asymptotic Modal Analysis (AMA) method to predict the high-frequency vibroacoustic response of structural and acoustical systems. The AMA method is based on taking the asymptotic limit of Classical Modal Analysis (CMA) as the number of modes in the structural system or acoustical system becomes large in a certain frequency bandwidth. While CMA requires both the computation of individual modes and a modal summation, AMA evaluates the averaged modal response only at a center frequency of the bandwidth and does not sum the individual contributions from each mode to obtain a final result. It is similar to Statistical Energy Analysis (SEA) in this respect. However, while SEA is limited to obtaining spatial averages or mean values (as it is a statistical method), AMA is derived systematically from CMA and can provide spatial information as well as estimates of the accuracy of the solution for a particular number of modes. A principal goal is to present the state-of-the-art of AMA and suggest where further developments may be possible. A short review of the CMA method as applied to structural and acoustical systems subjected to random excitation is first presented. Then the development of AMA is presented for an individual structural system and an individual acoustic cavity system, as well as a combined structural-acoustic system. The extension of AMA for treating coupled or multi-component systems is then described, followed by its application to nonlinear systems. Finally, the AMA method is summarized and potential further developments are discussed.

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Page Count

110

Publisher

Springer Nature

Published Date

ISBN 10

3031796896

ISBN 13

9783031796890

Studies in Nonlinear Aeroelasticity

By: Earl H. Dowell,Marat Ilgamov

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Studies in Nonlinear Aeroelasticity

By: Earl H. Dowell,Marat Ilgamov

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.

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Page Count

469

Publisher

Springer Science & Business Media

Published Date

ISBN 10

1461239087

ISBN 13

9781461239086

Dynamics Of Very High Dimensional Systems

By: Earl H Dowell,Deman Tang

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Dynamics Of Very High Dimensional Systems

By: Earl H Dowell,Deman Tang

Many books on dynamics start with a discussion of systems with one or two degrees of freedom and then turn to the generalization to the case of many degrees of freedom. For linear systems, the concept of eigenfunctions provides a compact and elegant method for decomposing the dynamics of a high dimensional system into a series of independent single-degree-of-freedom dynamical systems. Yet, when the system has a very high dimension, the determination of the eigenfunctions may be a distinct challenge, and when the dynamical system is nonconservative and/or nonlinear, the whole notion of uncoupled eigenmodes requires nontrivial extensions of classical methods. These issues constitute the subject of this book.

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Page Count

285

Publisher

World Scientific Publishing Company

Published Date

ISBN 10

9813102276

ISBN 13

9789813102279

Earl Blackwell's Celebrity Register

By: Earl Blackwell

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Earl Blackwell's Celebrity Register

By: Earl Blackwell

The most insightful and least idolatrous of the celebrity references, this edition provides some 1,300 high-quality anecdotal essays on the stars of art, business, finance, religion and more from Michael Keaton and Marlon Brando to Art Buchwald and Connie Chung, to Mike Tyson and Barbara Bush. Annotation copyright Book News, Inc. Portland, Or.

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Page Count

510

Published Date

ISBN 10

0810368757

ISBN 13

9780810368750

Book's by Earl H Dowell

Asymptotic Modal Analysis of Structural and Acoustical Systems

Asymptotic Modal Analysis of Structural and Acoustical Systems

Studies in Nonlinear Aeroelasticity

Studies in Nonlinear Aeroelasticity

Dynamics Of Very High Dimensional Systems

Dynamics Of Very High Dimensional Systems

Earl Blackwell's Celebrity Register

Earl Blackwell's Celebrity Register

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