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Author: M. S. Howe
Publisher: Cambridge University Press
ISBN: 9780521012232
Category : Mathematics
Languages : en
Pages : 236
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Book Description
Table of contents
Author: M. S. Howe
Publisher: Cambridge University Press
ISBN: 9780521012232
Category : Mathematics
Languages : en
Pages : 236
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Book Description
Table of contents
Author: Alan Powell
Publisher:
ISBN:
Category : Sound
Languages : en
Pages : 108
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Book Description
Physical arguments are developed to show how aerodynamic sound is generated as a result of the movement of vortices, or of vorticity, in an unsteady fluid flow. In a very simple model the aeolian tone is attributed to the dipolelike flow caused by the stretching of vortex rings. There is no net stretching of vortex rings in a free flow, but each moving element of vorticity still causes a local dipole-like flow, so that equal and opposite elements act together to form quadrupoles. Mathematical developments follow. The simple aeolian tone model is shown to be valid for low Strouhal numbers, the general result also incorporating the effect of the fluctuating Bernoulli pressure at the surface of the body. The free flow quadrupole model is shown to be exact, and also to agree with Lighthill's result. Using vorticity as a common basis, the compressible flow is compared to the corresponding incompressible one, the hydrodynamic field and the relationship to classical field theory being discussed. (Author).
Author: Michael Howe
Publisher: Cambridge University Press
ISBN: 1107044405
Category : Science
Languages : en
Pages : 311
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Book Description
This book provides an introductory account of the theory of sound production and propagation and its interactions with solid structures. It includes general theory, diffraction and scattering theory, aerodynamic sound and fluid-structure-acoustic interactions, and a chapter of worked examples. It is intended for a one-semester course on acoustics at the advanced undergraduate or graduate level.
Author: M. S. Howe
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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Book Description
An analysis is made of the sound produced when a field of vorticity is cut by an airfoil in low Mach number flow. A general formula is given for the acoustic pressure when the airfoil is rigid and the chord is acoustically compact. This expresses the radiation in terms of an integral over the region occupied by the vorticity; the integrand contains factors describing the influence of the thickness, twist and camber of the airfoil. Explicit analytical results are derived for the case of a rectilinear vortex, having small core diameter and finite axial velocity defect, which is 'chopped' by an airfoil of large aspect ratio. The acoustic signature generally comprises two components associated respectively with the axial and azimuthal vorticity, the latter being determined by the velocity defect distribution within the core. Sound is generated predominantly when the core is in the neighborhoods of the leading and trailing edges. The contribution from the trailing edge is usually small, however, because of destructive interference between sound produced by edge-diffraction of near field energy of the vortex and that produced by vorticity shed into the wake of the airfoil in order to satisfy the unsteady Kutta condition that the pressure and velocity should be bounded at the edge.
Author: John William Strutt Baron Rayleigh
Publisher:
ISBN:
Category : Music
Languages : en
Pages : 344
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Book Description
Author: Y. Auregan
Publisher: Springer
ISBN: 3540458808
Category : Science
Languages : en
Pages : 302
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Book Description
The coupling between acoustic waves and fluid flow motion is basically nonlinear, with the result that flow and sound modify themselves reciprocally with respect to generation and propagation properties. As a result this problem is investigated by many different communities, such as applied mathematics, acoustics and fluid mechanics. This book is the result of an international school which was held to discuss the foundation of sound--flow interactions, to share expertise and methodologies, and to promote cross-fertilization between the different disciplines involved. It consists essentially of a set of pedagogical lectures and is meant to serve not only as a compact source of reference for the experienced researcher but also as an advanced textbook for postgraduate students, and nonspecialists wishing to familiarize themselves in depth, at a research level, with this fascinating subject.
Author: U. Müller
Publisher: Springer Science & Business Media
ISBN: 3642672205
Category : Science
Languages : en
Pages : 663
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Book Description
Dedicated to Prof. Dr.-Ing. J. Zierep
Author: David A. Ash
Publisher:
ISBN: 9781920535735
Category : Science
Languages : en
Pages : 0
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Book Description
Thousands of years ago in ancient India, Yogis probed the atom with supernormal powers called siddhis. What they saw was subatomic particles as vortices of energy. That insight gave rise to maya the illusion of forms. Anticipating Einstein, Yogis realised everything is energy. There is no material substance underlying our world. They knew the bedrock of reality is mind and consciousness. That is endorsed today at the cutting edge of quantum physics. Applied to modern physics, the vortex shows how we are deluded by materialism. The particles and forces of nature are explained by the vortex of energy and physics becomes easy to understand for everybody. Predicting the most important scientific discovery of the late 20th century, The Vortex Theory could be the complete theory predicted by Stephen Hawking at the end of A Brief History of Time. The Vortex Theory provides a bridge between science and spirituality. At last we have a sound scientific theory to back belief in non material worlds. A new understanding of Life and Spirit could take us to fresh frontiers of discovery because it may be space is full of Life.
Author: Gerardus Carolus Johannus Hofmans
Publisher:
ISBN: 9789038606972
Category : Sound
Languages : en
Pages : 233
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Book Description
Author: Britta H. Sjogren
Publisher: University of Illinois Press
ISBN: 0252030281
Category : Performing Arts
Languages : en
Pages : 266
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Book Description
A pathbreaking feminist analysis of sound's shifting relation to image in film
