Read e-book online Acoustics of Fluid-Structure Interactions (Cambridge PDF

By M. S. Howe

ISBN-10: 0521633206

ISBN-13: 9780521633208

Acoustics of Fluid-Structure Interactions addresses an more and more very important department of fluid mechanics--the absorption of noise and vibration through fluid movement. This topic, which deals a variety of demanding situations to traditional components of acoustics, is of transforming into crisis in areas the place the surroundings is adversely plagued by sound. Howe offers helpful history fabric on fluid mechanics and the straightforward suggestions of classical acoustics and structural vibrations. utilizing examples, a lot of which come with entire labored suggestions, he vividly illustrates the theoretical strategies concerned. He presents the root for all calculations helpful for the decision of sound iteration via plane, ships, common air flow and combustion platforms, in addition to musical tools. either a graduate textbook and a reference for researchers, Acoustics of Fluid-Structure Interactions is a vital synthesis of data during this box. it's going to additionally reduction engineers within the conception and perform of noise keep watch over.

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Additional resources for Acoustics of Fluid-Structure Interactions (Cambridge Monographs on Mechanics)

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The method is applicable generally to time-harmonic wave problems governed by linear equations. However, misleading predictions can occur for systems that are linearly unstable. 7 Fundamental solutions of the acoustic wave equations 37 produced by a source in a steady flow over an elastic surface exhibits linear instabilities that grow by extracting energy from the mean flow. These instabilities are not captured by the Landau-Lighthill procedure because it assumes that all of the perturbation energy is supplied by the source.

Y,t)d3y. 7) J —oo Example 1. 7)), is a multipole of order one (a monopole). 8 Influence of source motion 45 which is the same as the sound produced by a point source J-"(x, t) = po8(x)dm(t)/dt. Example 2. A compact body force F(x, t) is an acoustic dipole (an order two multipole). If the force is centered on x = 0, we find, because T = —divF, where f(t) = J F(y, t) d3y. The radiation at large distances is the same as that produced by a point force f(t)8 (x). If the direction of f is constant, thefieldshape has two lobes, with the peak radiation intensities occurring in the directions of ±f.

34) describes the transfer of heat by molecular conduction and convection. 6 Sound propagation in homentropic, irrotational flow 27 surface so that heat transfer between the solid and fluid is dominated by thermal conduction; this is analogous to the dominance of the viscous diffusion of vorticity near the surface. The condition that the surface layer offluidbe in thermodynamic equilibrium with the solid requires the fluid and solid temperatures to be equal at the surface. 6 Sound Propagation in Homentropic, Irrotational Flow Vibrating mechanical structures, agitated regions of turbulent flow, the mixing of flows of different temperatures, and so forth produce fluctuations in the pressure that are communicated throughout a fluid as sound - a succession of compressions and rarefactions that propagate away from the acoustic source region.

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Acoustics of Fluid-Structure Interactions (Cambridge Monographs on Mechanics) by M. S. Howe

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