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Articles 1  6 of 6
FullText Articles in Engineering Science and Materials
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 timefrequency analysis to the signals detected at a receiver. These highly dispersive and complex waveforms are measured for sourcereceiver separations ranging from 40 to 180 plate thicknesses and at frequencies such that ten to twenty RayleighLamb branches are included. Reassigned, smoothed, pseudoWignerVille distributions are generated that exhibit the expected sharp ridges in the timefrequency plane, lying along the predicted frequencytimeofarrival relations. The sourcereceiver separation can be determined from such plots.
Adaptive Sampling For Coordinate Metrology, Robert Edgeworth, Robert G. Wilhelm
Adaptive Sampling For Coordinate Metrology, Robert Edgeworth, Robert G. Wilhelm
Mechanical & 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 ...
Large Amplitude Pitching Of Supermaneuver Delta Wings Including Flow Control, Yahia A. Abdelhamid
Large Amplitude Pitching Of Supermaneuver Delta Wings Including Flow Control, Yahia A. Abdelhamid
Mechanical & Aerospace Engineering Theses & Dissertations
The unsteady, threedimensional NavierStokes equations are solved to simulate and study the aerodynamic response of a delta wing undergoing large amplitude pitching motion up to 90° angle of attack. The primary model under consideration consists of a 76° swept, sharpedged delta wing of zero thickness, initially at zero angle of attack. The freestream Mach number and Reynolds number are 0.3 and 0.45 × 106, respectively. The governing equations are solved timeaccurately using the implicit, upwind, Roe fluxdifference splitting, finitevolume scheme. Both laminar and turbulent flow solutions are investigated. In the laminar flow solutions, validation of the computational results is ...
Combining Wavelets And Hotelling Transforms In Image Query, Sol Neeman Ph.D.
Combining Wavelets And Hotelling Transforms In Image Query, Sol Neeman Ph.D.
Engineering Studies Faculty Publications and Creative Works
In the "content based" image query, also referred to as "query by example," "similarity retrieval" or "sketch retrieval," the query image is provided by the user either as a sketch of the object, as the output of a scanner or a video camera. Some of the difficulties associated with content based image query are described in [1], e.g. significant difference between the "query image" and the "target image," artifacts and poor resolution of the query image make a straightforward comparison of images using L1 and l2 metrics not effective.
In [2] a new strategy is suggested based on wavelet ...
Fundamentals Of Linear State Space Systems, John Bay
Fundamentals Of Linear State Space Systems, John Bay
Electrical and Computer Engineering Faculty Scholarship
This book addresses two primary deficiencies in the linear systems textbook market: a lack of development of state space methods from the basic principles and a lack of pedagogical focus. The book uses the geometric intuition provided by vector space analysis to develop in a very sequential manner all the essential topics in linear state system theory that a senior or beginning graduate student should know. It does this in an ordered, readable manner, with examples drawn from several areas of engineering. Because it derives state space methods from linear algebra and vector spaces and ties all the topics together ...
Efficient Dynamic Unstructured Methods And Applications For Transonic Flows And Hypersonic Stage Separation, Xiaobing Luo
Efficient Dynamic Unstructured Methods And Applications For Transonic Flows And Hypersonic Stage Separation, Xiaobing Luo
Mechanical & Aerospace Engineering Theses & Dissertations
Relativemoving boundary problems have a wide variety of applications. They appear in staging during a launch process, store separation from a military aircraft, rotorstator interaction in turbomachinery, and dynamic aeroelasticity.
The dynamic unstructured technology (DUT) is potentially a strong approach to simulate unsteady flows around relativemoving bodies, by solving timedependent governing equations. The dualtime stepping scheme is implemented to improve its efficiency while not compromising the accuracy of solutions. The validation of the implicit scheme is performed on a pitching NACA0012 airfoil and a rectangular wing with low reduced frequencies in transonic flows. All the matured accelerating techniques, including the ...