Statistics – Computation
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........37p&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF RHODE ISLAND, 1993.Source: Dissertation Abstracts International, Volume: 54-09, Section: B, page:
Statistics
Computation
Scientific paper
This study is directed at the investigation of the elasto-acoustic response of fluid-loaded structures. The following problems involving structural geometries for which the wave equation is separable are investigated: (1) Fluid-loaded infinite elastic plates subjected to arbitrary two dimensional loading. Specific cases of interest include plates excited by a harmonic line force, harmonic plane wave scattering from plates with a single and periodically spaced line impedance discontinuities, and a plate excited by a point force. (2) Fluid-loaded infinite circular cylindrical shells subjected to arbitrary loading on their surfaces. A specific problem of interest is the case of a shell excited by a ring force. (3) Fluid-loaded spherical elastic shells excited by harmonic axisymmetric loading. In all the cases, the structures are modeled by the mathematical theory of elasticity. Thus the results are exact within the context of linear elasto-dynamics and are applicable over a very wide range of excitation frequencies and relative plate/shell thicknesses. The equations of motion for the structure and the fluid are formulated in terms of the elastic displacement potentials. The equations are then transformed by applying the appropriate integral transform and the resulting equations are solved together with the boundary conditions in the transform domain. Analytical expressions in the closed form are obtained for the far-field pressure levels. Numerical results are presented for a wide range of parameters for various harmonic field quantities of interest and their characteristics are related to underlying physics of the wave field on the fluid-structure interface. For comparison, the results obtained using the approximate thin plate/shell theories are also presented. Finally the problem of transient interaction between impedance discontinuities on an elastic vibrator is addressed using a convolution integral equation approach. The general formulation is then applied for an elastic plate having discontinuities. The use of harmonic transfer functions and the chirp-z transform technique is discussed for efficient numerical computations. The results are presented for a simply supported fluid-loaded plate subjected to a Gaussian modulated cosine force input, and are interpreted in terms of multiply reflected pulses between the supports.
No associations
LandOfFree
Acoustic Harmonic Radiation and Scattering from Fluid-Loaded Plates and Shells with Impedance Discontinuities. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Acoustic Harmonic Radiation and Scattering from Fluid-Loaded Plates and Shells with Impedance Discontinuities., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustic Harmonic Radiation and Scattering from Fluid-Loaded Plates and Shells with Impedance Discontinuities. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1264386