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Articles 1 - 5 of 5
Full-Text Articles in Engineering
Determination Of Plate Source, Detector Separation From One Signal, Stephen D. Holland, Tadej Kosel, Richard Weaver, Wolfgang Sachse
Determination Of Plate Source, Detector Separation From One Signal, Stephen D. Holland, Tadej Kosel, Richard Weaver, Wolfgang Sachse
Stephen D. Holland
We address the problem of locating a transient source, such as an acoustic emission source, in a plate. We apply time-frequency analysis to the signals detected at a receiver. These highly dispersive and complex waveforms are measured for source-receiver separations ranging from 40 to 180 plate thicknesses and at frequencies such that ten to twenty Rayleigh-Lamb branches are included. Re-assigned, smoothed, pseudo-Wigner-Ville distributions are generated that exhibit the expected sharp ridges in the time-frequency plane, lying along the predicted frequency-time-of-arrival relations. The source-receiver separation can be determined from such plots.
Breakaway Steel Guardrail Post, Dean L. Sicking, John D. Reid, John R. Rohde
Breakaway Steel Guardrail Post, Dean L. Sicking, John D. Reid, John R. Rohde
Department of Mechanical and Materials Engineering: Faculty Publications
A breakaway guardrail post includes upper and lower post sections spaced apart but connected by a breakaway joint. The joint is attached at one end to the upper post by a first fastener set and connected at a second end by a second fasteners set. Upon impact forces being applied to the upper post section, the first fastener fails and the upper post section rotates downwardly.
Foundation Sleeve For A Guardrail System, Dean L. Sicking, John D. Reid, John R. Rohde
Foundation Sleeve For A Guardrail System, Dean L. Sicking, John D. Reid, John R. Rohde
Department of Mechanical and Materials Engineering: Faculty Publications
A highway guardrail terminal system having horizontally extending guardrail elements mounted on a plurality of posts. Foundation sleeves having an elongated slit along one side retain and support appropriate guardrail posts. A plurality of stiffing ribs extend across the slit at a distal portion of the tube. The sleeves enable a safer and faster removal of broken guardrail posts after vehicular impact.
Adaptive Sampling For Coordinate Metrology, Robert Edgeworth, Robert G. Wilhelm
Adaptive Sampling For Coordinate Metrology, Robert Edgeworth, Robert G. Wilhelm
Department of Mechanical and Materials Engineering: Faculty Publications
An iterative sampling process for dimensional measurement is presented. The strategy is based upon the use of surface normal measurement data to develop an interpolating curve between sample points. The interpolant is used to select subsequent measurement targets iteratively. The process is repeated until the measurement converges to a complete and accurate evaluation of the surface. The required sample size is proportional to part quality. The most accurate parts will require the least sample points; whereas, lower quality parts will require a greater number of total samples. The method is particularly applicable to measurement of complex surfaces with coordinate measuring …
Triangulation Rangefinder And Sight Positioning System, Jeffrey Hargrove, William G. Wickham, John E. Briggs
Triangulation Rangefinder And Sight Positioning System, Jeffrey Hargrove, William G. Wickham, John E. Briggs
Mechanical Engineering Patents
A rangefinder includes an angle sensitive transducer and a programmed data processor to calculate the distance to a target. In one embodiment, the rangefinder also includes a point-to-point measuring device. Another embodiment provides a linear actuator to selectively move a sight indicator vertically. A yet additional embodiment includes a liquid crystal display which displays information to the user.