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Full-Text Articles in Mechanical Engineering
Inverse Boundary Element/Genetic Algorithm Method For Reconstruction O, Mahmood Silieti
Inverse Boundary Element/Genetic Algorithm Method For Reconstruction O, Mahmood Silieti
Electronic Theses and Dissertations
A methodology is formulated for the solution of the inverse problem concerned with the reconstruction of multi-dimensional heat fluxes for film cooling applications. The motivation for this study is the characterization of complex thermal conditions in industrial applications such as those encountered in film cooled turbomachinery components. The heat conduction problem in the metal endwall/shroud is solved using the boundary element method (bem), and the inverse problem is solved using a genetic algorithm (ga). Thermal conditions are overspecified at exposed surfaces amenable to measurement, while the temperature and surface heat flux distributions are unknown at the film cooling hole/slot walls. …
An Experimental And Theoretical Investigation Fo Axially Symmetric Wave Propagation In Thick Cylindrical Waveguides, Anthony Puckett
An Experimental And Theoretical Investigation Fo Axially Symmetric Wave Propagation In Thick Cylindrical Waveguides, Anthony Puckett
Electronic Theses and Dissertations
Solid circular cylinders as wavaguides for the propagation of longitudinal elastic waves are used pximarily as buffer rods in high temperature nondestructive evaluation (NDE), and are also found in the split Hopkinson pressure bar (SHPB). Experiments are typically designed so that only the nondispersive range of the first mode propagates. Design constraints sometimes require larger wavcguides and higher ficquencies that propagate multiple dispersive modes, which can add considerable con1plexity to the signal. This thesis presents an analytical modcl for multiple mode wave propagation in a finite solid cylindrical waveguide as a means of interpreting the complex signals and possibly removing …
Performance Of Interface Elements In The Finite Element Method, Kairas Rabadi
Performance Of Interface Elements In The Finite Element Method, Kairas Rabadi
Electronic Theses and Dissertations
The objective of this research is to assess the performance of interface elements in the finite element method. Interface elements are implemented in the finite element codes such as MSC.NASTRAN, which is used in this study. Interface elements in MSC.NASTRAN provide a tool to transition between a shell-meshed region to another shell-meshed region as well as from a shell-meshed region to a solid-meshed region. Often, in practice shell elements are layered on shell elements or on solid elements without the use of interface elements. This is potentially inaccurate arising in mismatched degrees of freedom. In the case of a shell-to-shell …