Numerical Discussion of Creeping Acoustical Waves Around Cylinders. Sound Scattering by Elastic Cylindrical Shells PDF Download
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Author: H. Uberall Publisher: ISBN: Category : Languages : en Pages : 29
Book Description
The report presents the solution for the scattered field corresponding to a plane sound wave incident upon an infinite elastic circular-cylindrical concentric shell, imbedded in a fluid and enclosing another fluid. The results are shown to contain the known special cases of fluid and elastic solid cylinders. Furthermore, limiting expressions for long wavelengths are obtained in special cases. The second part of this report is a sequel to a previous report (AD-625 793) 'Pulsed Creeping Waves in Acoustics', which discussed diffraction of sound waves and pulses by cylinders. Graphical illustrations are presented of some aspects of the creeping waves, in particular their velocities and damping for rigid and soft cylinders, the backscattering cross section for rigid cylinders, and the shape of the head of the diffracted pulses. It is found that only very few creeping waves already give an excellent approximation to the exact solution for large and even moderately large values of ka. (Author).
Author: H. Uberall Publisher: ISBN: Category : Languages : en Pages : 29
Book Description
The report presents the solution for the scattered field corresponding to a plane sound wave incident upon an infinite elastic circular-cylindrical concentric shell, imbedded in a fluid and enclosing another fluid. The results are shown to contain the known special cases of fluid and elastic solid cylinders. Furthermore, limiting expressions for long wavelengths are obtained in special cases. The second part of this report is a sequel to a previous report (AD-625 793) 'Pulsed Creeping Waves in Acoustics', which discussed diffraction of sound waves and pulses by cylinders. Graphical illustrations are presented of some aspects of the creeping waves, in particular their velocities and damping for rigid and soft cylinders, the backscattering cross section for rigid cylinders, and the shape of the head of the diffracted pulses. It is found that only very few creeping waves already give an excellent approximation to the exact solution for large and even moderately large values of ka. (Author).
Author: Louis R. Dragonette Publisher: ISBN: Category : Cylinders Languages : en Pages : 68
Book Description
The relationship is determined between predicted circumferential waves on cylinders and the normal-mode series solution for the acoustic scattering by submerged metal cylinders. Specific circumferential waves are linked to the free modes of vibration of the cylinder, and this identification is used to experimentally detect the Rayleigh surface wave at low ka. Circumferential waves on thin cylindrical shells are demonstrated to closely follow prediction based on Lamb theory for flat plates. (Author).
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 1282
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: George Vladimir Frisk Publisher: ISBN: Category : Rayleigh waves Languages : en Pages : 186
Book Description
The connection between creeping wave and flat surface wave theory is established by investigating the limit of acoustic scattering from a solid elastic cylinder, imbedded in a fluid, whose radius tends to infinity. First, the asymptotic behavior of the complex circumferential wave numbers is calculated by substituting the appropriate Debye- or Airy-type asymptotic expansions into the 3 x 3 secular determinant and solving it using iterative techniques. It is found that, in the limit of infinite cylinder radius, the wave numbers of the Rayleigh and Stoneley modes tend toward those of the Rayleigh and Stoneley waves on a flat elastic half-space, while the Franz mode wave numbers tend toward the wave number of sound in the fluid. The longitudinal and transverse Whispering Gallery mode wave numbers tend toward the longitudinal and transverse wave numbers in the solid. Graphical results are presented for an aluminum cylinder in water (and in one case, also in vacuum) and show good agreement with existing numerical results. Then, using the Watson-Sommerfeld transformation, the limiting behavior of the solution to the problem of the scattering of a cylindrical wave from a cylinder whose radius tends to infinity is investigated. Using the analytic expressions for the creeping wave numbers, it is shown that the residue sums corresponding to the different classes of circumferential waves tend individually toward the different types of surface waves found on the flat surface.
Author: H. Uberall
Author: H. Uberall
Author: Louis R. Dragonette
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Author: Peter Uginčius
Author: 
Author: 
Author: Peter Uginčius
Author: 
Author: 
Author: George Vladimir Frisk