منابع مشابه
Sound radiation from exponentially growing and decaying surface waves
A simplified model problem is used to illustrate some of the parameters controlling the radiation of sound into an ambient medium due to the growth and subsequent decay of subsonic travelling waves, such as may occur via non-linear interactions in turbulent free shear flows. It is shown that substantial sound may be generated by apparently subsonic modes as a result of their growth and decay ch...
متن کاملReflection, by a Two-dimensional Ocean Surface, of Plane Sound Waves Coming from the Water Side
Problems involving the reflection of radiation by random rough surfaces arise in a number applications. We shall be interested primarily in an acoustic plane wave impinging on the surface from the water side. The acoustic pressure changes vanish at the surface. We use an expansion in polynomials of Guassian functionals. The method can be extended to more general situations involving more than o...
متن کاملRadiation of Surface Waves into Concrete by Means of a Wedge Transducer: Design and Optimization
Spectral Analysis of Surface Waves (SASW) has been used for two decades to determine the stiffness profile of soils. The application of this technique is currently evaluated for inspecting subsurface damage in concrete structures in the 100 kHz frequency range. Accurate measurements of phase velocity and attenuation require an appropriate source to efficiently generate wideband Rayleigh waves. ...
متن کاملModelling the Sound Radiation by Loudspeaker Cabinets
While musical instruments often rely on a body which resonates on purposefully to amplify the vibration produced by a string or a membrane, such as in a violin or a guitar, loudspeaker cabinets should not contribute at all to the total sound radiation, but aim instead to be a perfectly rigid box which encloses the drive units in charge to transform the electrical signal at their terminal into a...
متن کاملImprovement of Antenna Radiation Efficiency by the Suppression of Surface Waves
The characteristics of coplanar waveguide (CPW) fed ring antennas (such as gain, efficiency and polarization purity) are degraded by the dielectric losses and excitation of surface waves on the substrates. To counteract such effects, we propose to remove some portions of the substrate in the vicinity of the metallic patches, which effectively eliminates the conditions for the generation of surf...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1967
ISSN: 0001-4966
DOI: 10.1121/1.2143564