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 vital department of fluid mechanics--the absorption of noise and vibration through fluid stream. This topic, which deals various demanding situations to standard components of acoustics, is of turning out to be drawback in areas the place the surroundings is adversely laid low with sound. Howe provides beneficial heritage fabric on fluid mechanics and the easy thoughts of classical acoustics and structural vibrations. utilizing examples, lots of which come with entire labored recommendations, he vividly illustrates the theoretical techniques concerned. He presents the foundation for all calculations beneficial for the decision of sound new release by way of airplane, ships, normal 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 crucial synthesis of data during this box. it is going to additionally relief 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)

Example text

21), in steady irrotationalflowat velocity U(x) the total enthalpy B = w + | U2 is constant throughout the fluid. 9) give w= YP (y - \)p = -. 621) where co is the stagnation, or reservoir, sound speed at which U = 0. Mo = U(x)/co is the local Mach number referred to the sound speed co. The value of c departs significantly from the stagnation sound speed only when Mo becomes large. 7. 7 Fundamental solutions of the acoustic wave equations 33 on different streamlines). 18) shows that such flows are generally rotational.

11) 2KO 38 1 Introduction Example 5. 7) with respect to the component k2, say, of k may be performed by residues. There are simple poles at k2 = ± +jK2o-k\-k] that (for k2 + k2 < K2) move to opposite sides of the real &2-axis when KO is replaced by KO + ie (e > 0). If we define the square root by y/^-kj-kj = sgn(KO)|*JKI-k\-k\\ for 6 = 0 and k\ + k2 < /c2, then the poles are displaced respectively into the upper/lower half-planes when € > 0. Analytic continuation for 6 = +0 then implies that ^Kl-k\-k\ = +i\^/K2o-k\-kl\ for k\ + k2 > K%.

The integral in this expression vanishes only if the source is actually equivalent to a multipole of order higher than 2n. The acoustic amplitude decreases like l/|x| as |x| —> oo; its dependence on the direction of propagation (the "field shape") is determined by the product of /*/_/#... (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).

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

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