Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Finite Element Modeling (FEM)"”.
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Design, Fabrication, and Characterization of Terahertz Quantum Cascade Lasers
… should be minimal. We use two-dimensional finite element modeling (FEM) to determine the threshold material gain coefficient and compare it to the experimental results of the threshold current density. We find that the threshold current density is roughly constant until the substrate …
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Simulation of tongue muscle deformation
… during physiological deformations, we performed finite element modeling (FEM) employing a mesh generated from mesoscale multi-voxel fiber like tracts obtained in vivo by high resolution diffusion tensor imaging with tractography. DTI tractography displayed the complete fiber anatomy of the …
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Tensile Fracture Mechanisms of Ferritic/martensitic Structural Materials
… true strain/stress curve, a critical input in finite element modeling (FEM) analysis. Previous scholars have developed several analytical methods to characterize true strain/stress behavior after necking merely based on geometry correction or direct linear extrapolation. Grounded with …
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A Heat Transfer Modeling Study of Rail Thermite Welding
… weld defects in rail thermite welds. Finite Element Modeling (FEM) was used to analyze the heat transfer behavior during the thermite welding process. The results of the thermal analyses were correlated to the development of various weld defects and compared with measurements performed …
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Non invasive brain stimulation : modeling and experimental analysis of transcranial magnetic stimulations and transcranial DC stimulation as a modality for neuropathology treatment
… treatment by means of both experimental and modeling paradigms. The first and primary modality that will be analyzed is Transcranial Magnetic Stimulation (TMS). TMS is a technique that uses the principle of electromagnetic induction to focus induced currents in the brain and modulate cortical …
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Validation of a 3-D Virtual Acoustic Prototyping Method For Use In Structural Design
… acoustic prototyping method in this thesis uses finite element modeling (FEM), the equivalent source method (ESM), and head-related transfer functions (HRTFs). A tradeoff exists between the accuracy of the auralization process and the number of equivalent sources (and thus computational power) …
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Fiber-Reinforced Polymer Bridge Girders for Extremely Aggressive Environments
… FRP tubes, and Double Web I-Beams (DWB). Finite Element Modeling (FEM) was used to study the overall stiffness of FRP girder bridges with a cast-in-place concrete deck. Girder distribution factors for moment were also computed using reliability analysis tools and FEM. These results were …
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AI-POWERED DIGITAL TWIN MODELING USING LARGE HIGHWAY INFRASTRUCTURE DATASETS
… By Leveraging machine learning (ML) and finite element modeling (FEM), the study develops innovative tools for geotechnical and structural condition monitoring and response analysis. Key contributions include the use of neural networks for subsurface property prediction, LiDAR-based …
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An Investigation to Detect Delamination in Composite Laminated Plates Under Dynamic Loading
… differences and damping between specimens. Finite element Modeling (FEM) ensured correlation of the flexural bending mode shapes between theoretical, analytical, and experimental. It was found that, the comparison between the results of the theoretical, Finite Element Analysis, and …
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Fabrication of critical-angle transmission gratings for high efficiency x-ray spectroscopy
Diffraction gratings are fundamental optical elements that separate incident light into its constituent wavelength components. This dispersive feature of diffraction gratings has been broadly utilized in many applications including spectroscopy, microscopy, and interferometry. As high-energy …
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Predicting the thermal performance of bio-based cold chain packaging system
… thermal performance of bio-based ISCs through finite element modeling (FEM). Material characterization was conducted using Differential Scanning Calorimetry (DSC) and Heat Flow Meter techniques to obtain the thermal properties of corrugated fiberboard, honeycomb paperboard, and phase change …
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Patterned substrates for cell culture with electrohydrodynamic jet printing
… to create substrates with circular microwells. Finite element modeling (FEM) was used to show that microwell topography was a result of backfill contraction during exposure. The FE model was then used to make predictions for further substrate design. The techniques presented in this thesis …
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Thermal Characterization of Die-Attach Degradation in the Power MOSFET
… is to develop measurement techniques and finite element simulations that can measure the changes in thermal performance caused by changes in die-attach voided area. These experimental results and simulations can then be used to create predictions of the thermal performance of a particular …
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Modeling, design, fabrication and reliability characterization of ultra-thin glass BGA package-to-board interconnections
… without degrading thermomechanical reliability. Modeling, package and board design, fabrication and reliability characterization were carried out to demonstrate reliable board-level interconnections of large, ultra-thin glass packages. Finite-element modeling (FEM) was used to investigate the …
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Design of a Linear Ultrasonic Piezoelectric Motor
… unique ultrasonic motor (USM) was designed using finite element modeling (FEM). A USM operates by vibrating a drive tip in an elliptical motion while it is in periodic contact with a driven surface. Piezoelectric elements are used to create the elliptical motions and are driven near a resonant …
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Designing a Localized Lower Body Negative Pressure Garment for Long-Duration Spaceflight
… The development of the S.K.I.N. began with finite element modeling (FEM) to identify optimal material properties and structural geometry. Iterative physical prototyping resulted in a sinusoidal silicone waveform design, selected for its mechanical stability and user comfort. The final …
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Tactile sensation imaging system and algorithms for tumor detection
… algorithm and an inversion algorithm. The finite element modeling (FEM) based forward algorithm is designed to comprehensively predict the tactile data based on the parameters of an inclusion in the soft tissue. This algorithm is then used to develop an artificial neural network (ANN) based …
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Influence of transdermal current flow in tDCS-induced cutaneous adverse events
… glands, and hair follicles) in current flow. The finite element modeling (FEM) of current flow using simplified tissue geometries predict higher current density at the electrode edge, but the experimental evidences for the cutaneous effects of tDCS (skin heating or skin reddening) are unclear. …
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Study of superconducting fault current limiters in power systems
… network in Germany is accomplished using Finite Element Modeling (FEM) on Matlab Simulink. It provides the complete research procedures of SFCL integrated with a grid network and the underlying impact of this integration is thoroughly analyzed. The real data and sophisticated models …
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Effect of nano-scale twinning on the fracture, fatigue and wear properties of copper
… sliding tracks coupled with large-deformation finite element modeling (FEM) simulations were used to assess local gradients in mechanical properties and deformation around the indenter track. The results indicate that friction evolution as well as local mechanical response is more strongly …
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