Acoustics of Fluid-Structure Interactions (Cambridge by M. S. Howe

By M. S. Howe

Acoustics of Fluid-Structure Interactions addresses an more and more very important department of fluid mechanics--the absorption of noise and vibration via fluid move. This topic, which deals quite a few demanding situations to standard components of acoustics, is of turning out to be situation in locations the place the surroundings is adversely stricken by sound. Howe provides helpful heritage fabric on fluid mechanics and the basic thoughts of classical acoustics and structural vibrations. utilizing examples, lots of which come with whole labored options, he vividly illustrates the theoretical innovations concerned. He presents the foundation for all calculations worthy for the decision of sound new release through 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 crucial synthesis of knowledge during this box. it's going to additionally relief engineers within the conception and perform of noise regulate.

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Example text

11) may not converge when n becomes large, in which case the series becomes an asymptotic approximation. The possibility of approximating a source of sound by an acoustically equivalent set of multipoles is the basis of practical active control schemes to suppress undesirable sources of noise [25]. Example 4. Two equal and opposite monopoles separated by a small distance I are together equivalent to a dipole. If the monopoles have source strengths ±m(t) and are placed respectively at ( ± ^ , 0, 0), show that pol cos 0 d2m where 0 is the angle between the observer direction x/|x| and the Jti-axis.

In the inviscid approximation this reduces to continuity of pressure. This is typically the approximation used for a gas bubble in a liquid, although when the bubble radius is very small (less than about 10~2 cm for air bubbles in water) the influence of surface tension should also be included [2,4]. If the bubble radius is R, surface tension causes the bubble pressure to exceed the ambient pressure by 2T/R, where T is the surface tension of the gas-liquid interface. 34) describes the transfer of heat by molecular conduction and convection.

The outgoing wave solution is also obtained from the condition that dissipation within the fluid (which gradually transforms acoustic energy into heat) causes the wave to decay faster than 1 /1x — y | at large distances from the source. This will be the case if, ab initio, KO is imagined to be assigned a small positive imaginary part that (for co > 0) shifts the pole off the real axis into the upper half-plane. This is effectively identical to a formal method proposed by Landau [22] and Lighthill [23] for obtaining the causal solution of time-harmonic wave problems.

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