Reverberation time and audibility in phased geometrical acoustics using plane or spherical wave reflection coefficients

The wave reflection coefficients of damage such as cracks, notches and slots in otherwise uniform beams depend on frequency and on the size of the damage. Experimental results are presented for the wave power reflection coefficients of transverse slots of various depths sawn into a number of beam specimens. These results are compared with a conventional spring model to estimate the depth of the slot. The method appears to work well for larger slot depths (greater than about 30% of the thickness of the beam) and at higher frequencies, allowing their existence to be inferred and their size to be estimated. This is due to the fact that the reflection coefficients are larger in these regimes. For smaller slots or at low frequencies, noise and experimental errors, such as miscalibration errors and ill-conditioning, become more significant.

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Converted PS-wave Reflection Coefficients in Weakly Anisotropic Media

Seismic Waves in Laterally Inhomogeneous Media ◽

10.1007/978-3-0348-8146-3_8 ◽

2002 ◽

pp. 1527-1562 ◽

Cited By ~ 14

Author(s):

Petr Jílek

Keyword(s):

Wave Reflection ◽

Anisotropic Media ◽

Reflection Coefficients

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Electromagnetic spherical wave reflection from a perfectly conducting surface of revolution

IRE Transactions on Antennas and Propagation ◽

10.1109/tap.1981.1142689 ◽

1981 ◽

Vol 29 (6) ◽

pp. 964-967

Author(s):

A. Ciarkowski

Keyword(s):

Wave Reflection ◽

Spherical Wave ◽

Conducting Surface ◽

Surface Of Revolution

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Plane wave reflection coefficients for a compressional wave in water incident on a "soft" seafloor with gas-charged sediment

Open-File Report ◽

10.3133/ofr80620 ◽

1980 ◽

Author(s):

Gary Boucher

Keyword(s):

Plane Wave ◽

Wave Reflection ◽

Compressional Wave ◽

Reflection Coefficients

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The attentuation of compression waves in lossy media*

Bulletin of the Seismological Society of America ◽

10.1785/bssa0460010047 ◽

1956 ◽

Vol 46 (1) ◽

pp. 47-56

Author(s):

L. Knopoff

Keyword(s):

Spherical Wave ◽

Multiple Reflection ◽

Reflection Coefficients ◽

Lithium Sulfate ◽

Seismic Modeling ◽

Wave Fronts ◽

Loss Mechanism ◽

Compression Waves ◽

Lossy Media ◽

Internal Viscosity

ABSTRACT By means of modeling experiments on a wax slab, oil-coupled lithium sulfate transducers are found to have excellent directional properties as seismic modeling transducers. Investigation of the several orders of multiple reflection amplitudes shows that consistency in the measured reflection coefficients for the spherical wave fronts is easily achieved if a loss mechanism of the internal viscosity type is attributed to the wax.

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