Search Results - "Costley, R. Daniel"

Structural infrasound from a barge collision with the Mississippi river bridge by Jordan, Anna M., Daniel Costley, R., Diaz-Alvarez, Henry, Simpson, Christopher P., McComas, Sarah L., McKenna Taylor, Mihan H.

“…The Mississippi River Bridge in Vicksburg, Mississippi, is a seven-span cantilever bridge that is 1033 m long by 20.9 m wide and is part of the Interstate-20…”
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Remote Structural Infrasound: Case Studies of Real-Time Infrastructure System Monitoring by McKenna, Mihan H, McComas, Sarah L, Danielle Whitlow, R, Diaz-Alvarez, Henry, Jordan, Anna M, Daniel Costley, R, Simpson, Christopher P

“…AbstractInfrastructure in the continental United States is often used beyond its design life due to budgetary constraints and logistical hurdles. New…”
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In situ measurements of sediment acoustic properties in Currituck Sound and comparison to models by Lee, Kevin M., Ballard, Megan S., McNeese, Andrew R., Muir, Thomas G., Wilson, Preston S., Costley, R. Daniel, Hathaway, Kent K.

“…In situ measurements of compressional and shear wave speed and attenuation were collected 30 cm below the water-sediment interface in Currituck Sound, North…”
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A comparison between directly measured and inferred wave speeds from an acoustic propagation experiment in Currituck Sound by Ballard, Megan S., Costley, R. Daniel, Sagers, Jason D., Lee, Kevin M., McNeese, Andrew R., Hathaway, Kent K., Wilson, Preston S., Smith, Eric W.

“…An acoustic propagation experiment was conducted in Currituck Sound to characterize low-frequency propagation in a very-shallow-water estuarine environment…”
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Comparison of acoustic and seismic excitation, propagation, and scattering at an air-ground interface containing a mine-like inclusion by Muir, Thomas G, Costley, R Daniel, Sabatier, James M

“…Finite element methods are utilized to model and compare the use of both a remote loudspeaker and a vertical shaker in the generation of sound and shear and…”
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Frequency-wavenumber processing for infrasound distributed arrays by Costley, R Daniel, Frazier, W Garth, Dillion, Kevin, Picucci, Jennifer R, Williams, Jay E, McKenna, Mihan H

“…The work described herein discusses the application of a frequency-wavenumber signal processing technique to signals from rectangular infrasound arrays for…”
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The measurement of pressure and level of fill in sealed storage drums by Costley, R. Daniel, Henderson, Mark E., Patel, Hitesh, Jones, E. William, Boudreaux, Gary M., Plodinec, M. John

“…A non-intrusive technique has been developed which will detect an increase in pressure over ambient levels and alert workers of potential danger…”
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Investigation of piezoelectric bimorph bender transducers to generate and receive shear waves by McNeese, Andrew R., Lee, Kevin M., Ballard, Megan S., Muir, Thomas G., Costley, R. Daniel

“…This paper further demonstrates the ability of piezoceramic bimorph bender elements to preferentially generate and receive near-surface shear waves for in situ…”
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Vibrational and acoustical response of a railroad bridge with vehicle loading by Costley, R. Daniel, Diaz-Alvarez, Henry, McKenna, Mihan H.

“…A finite element model has been developed for a Pratt truss railroad bridge located at Ft. Leonard Wood, MO. This model was used to investigate the vibration…”
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Array processing for direction of arrival of infrasound by Costley, R. Daniel, Frazier, W. Garth, Dillion, Kevin

“…Pipe arrays have conventionally been used to detect infrasound. The advantage of this approach is that the arrays have a large aperture over which wind noise…”
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Development of Interferometer for Acoustic Emission Testing by Bruttomesso, Douglas A, Jacobs, Laurence J, Costley, R. Daniel

“…The characterization of the exact response of an acoustic emission sensor is of fundamental importance for the quantitative nondestructive evaluation of…”
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Acoustic and direct vibratory excitation, propagation, and scattering of Rayleigh waves at an air-ground interface by Muir, Thomas G., Costley, R. Daniel, Hickey, Craig J., Sabatier, James M.

“…Finite element methods are utilized to model loudspeaker as well as shaker generation of sound, shear, and interface waves in an elastic solid containing an…”
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Low-frequency propagation in extremely shallow water by Costley, R. Daniel, Muir, Thomas G.

“…In water depths on the order of a wavelength, sound propagates with considerable involvement of the bottom, whose bulk and shear moduli as well as velocities…”
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Multitarget tracking using acoustic arrays by Costley, R. Daniel, Williams, Jay E., Clark, Robert C., Gray, Matthew A., Williams, Zachary, Harrington, Gary, Frazier, William G., Singleton, Jere

“…A tracking system has been developed, which consists of three or more five-microphone arrays. In previous experiments, these arrays have been deployed and used…”
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Acoustic detection of motor vessel signals in very shallow water by Costley, R. Daniel, Williams, Jay E., Muir, Thomas G.

“…A number of security threats and interdiction problems in shallow waterways and the very shallow littorals involve small vessels, which offer difficult…”
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Development of a time-frequency representation for acoustic detection of buried objects by VALEAU, Vincent, SABATIER, James, COSTLEY, R. Daniel, NING XIANG

“…A recently developed apparatus permits the detection of buried objects, such as landmines, by remotely sensing the variations of ground vibration that occur…”
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Sonic inspection of concrete bridge decks by Costley, R. Daniel, Boudreaux, Gary, Ramsey, William Gene

“…One technique for determining the integrity of concrete structures, such as bridge decks, involves dragging a chain across it and listening to the audible…”
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Acoustic detection of pressure in sealed drums by Costley, R. Daniel, Henderson, Mark

“…At many waste sites, transuranic (TRU), low-level, and mixed wastes are stored in 55-gallon drums. Many of these drums contain hazardous, organic wastes as…”
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Forward-looking acoustic mine sensing by Costley, R. Daniel, Sabatier, James M., Xiang, Ning

“…A mine sensing system based on acoustic-to-seismic coupling sonifies the ground with high amplitude (120 dB), broadband (80–300 Hz) sound and measures the…”
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Noise and vibration control for land mine detection by Costley, R. Daniel, Sabatier, James M., Xiang, Ning

“…Land mines can be detected by scanning the ground with a laser doppler vibrometer (LDV) to measure the motion (velocity) of the ground as it is being sonified…”
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