Acoustics of Fluid-Structure Interactions (Cambridge - download pdf or read online

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 by means of fluid circulate. This topic, which bargains quite a few demanding situations to traditional parts of acoustics, is of starting to be predicament in locations the place the surroundings is adversely stricken by sound. Howe provides worthy historical past fabric on fluid mechanics and the straight forward innovations of classical acoustics and structural vibrations. utilizing examples, lots of which come with whole labored strategies, he vividly illustrates the theoretical suggestions concerned. He presents the root for all calculations worthy for the choice of sound iteration via 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 knowledge during this box. it's going to additionally reduction engineers within the conception and perform of noise keep watch over.

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Extra info for Acoustics of Fluid-Structure Interactions (Cambridge Monographs on Mechanics)

Example text

1. Emission time coordinates for a uniformly translating source. where M = U(re)/co, and 0 is the angle between R and the direction of motion of the source at the emission time. 22) In this result 1/(1 — M cos 0 ) is called the Dopplerfactor, which causes sound radiated in the "forward" direction, ahead of the source (where cos 0 > 0), to be amplified by the motion, whereas sound propagating to the rear is attenuated. When U is constant, the characteristic frequency co of the received sound is modified in a similar manner because 1 dp co = p dt S(r e ) 1 as R -> oo dt ' 1 dS(re -Mcos0)S(r e ) dxe co0 = (1 - M c o s 0 ) ' where &>0 is the frequency in the absence of motion.

Example 5. In the presence of a uniform mean flow at speed U in the x\direction, plane wave solutions of the convected wave equation that propagate parallel to the mean flow are given by (p =

1). The reader can verify, however, that the retention of this term does not affect the outcome of the following analysis. The reciprocal problem involves source and force fields qf, F', and the velocity v\ and pressure p' are governed by -icopov'i + dp-j/dxj = F;, -{ia)/poc2o)pf + div v' = q'. 4b) after multiplying the first by v- and the second by — p'. 9 Reciprocity 53 respective multiplicands vt and —p. Subtract the resulting equations to obtain //div v - pdiv V + vt dp'tj dxj - vt dp\. dxj = (qpr + v • F') - (q'p + V • F).

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

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