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 26 for “"FEM simulation"”.
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FEM simulation of ultrasonic wave propagation in solid rods
… of the ultrasonic wave propagations. In the FEM analyses, each specimen with the same input is generated for comparing with the experimental results. In addition, the input frequency, element size, and integration time step are discussed to evaluate the accuracy of the FEM results. The output …
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GENERATION, MECHANICAL AND STATISTICAL ANALYSIS, AND FEM SIMULATION OF FRACTURE OF REPEATABLE RANDOM ROUGH SURFACES
… couples experimental and statistical theory, and FEM to extend knowledge of life of materials from initial service surface conditions through surface damage accumulation. Statistical moments and other parameters were correlated with fracture locations probability (H/N), versus auto correlation …
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Investigation of ultrasonic pressure distribution in a sonoreactor and a washing tank by FEM simulation
… washing tank by finite element method (FEM) by taking into account the coupling effect between the acoustic pressure in water and the mechanical vibration of the solid structure. To examine the ultrasound intensity distribution in a sonoreactor with a fixed volume of water, the …
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Finite element simulation of Durelli's photoelastic stress minimization method for shape optimization
Finite Element Method (FEM) was used to simulate the Photoelastic Stress Minimization (PSM) method developed by Durelli to solve the problem of finding the optimal stress raiser profiles in isotropic and advanced composite structures. In Durelli's method, material in lowly stressed regions of the …
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Planar Magnetics Design For Low-voltage Dc-dc Converters
… as small footprint. A novel methodology based on FEM simulation is proposed. By introducing Maxwell 2D simulator, optimal interleaving structures can be found to reduce AC losses that cannot otherwise be accounted for by conventional method. And 3D simulator is employed to make the results more …
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Eddy current displacement sensor with LTCC technology
… target blade were considered. Subsequently, the FEM method was used for further calculations. It was found via modal analysis that the position over the sharp end of a blade tip is the optimal mounting position for a sensor. Electromagnetic analysis showed that the sensitivity of the sensor …
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Sensitivity validation of a coaxial probe for a multilayer tissue model, using simulation and phantom measurements
… model measurements using the coaxial probe, and FEM simulation of an equivalent design, to determine the sensitivity of our coaxial probe. We have found that the sensing depth of the probe is at least 1mm in vitro. Current simulation results do not accurately reflect the in vitro measurements. …
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Applications of finite element method in studying mechanical behavior of concrete materials on different scales
Computer simulation is a powerful tool for understanding material behavior at a wide range of scales. This research uses finite element modeling for two investigations at two very different scales. The first study considers the microstructure of foam concrete material. The objective is providing …
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Measurements and finite element modelling of transformer flux with dc and power frequency current
… to excessive stray flux. Finite element matrix (FEM) modelling software is of considerable use in transformer engineering as it is able to solve electromagnetic fields in transformers. For many problems, typically involving only specific parts of a transformer, fairly accurate solutions can be …
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High temperature creep behavior of Inconel 617 and Haynes 230
… at temperatures of 850oC, 900oC, and 950oC. The simulation results have a reasonable agreement with experimental results at medium stress level, but overestimated the experimental result at low stress level and underestimated it at high stress level. The FEM simulation provides a better …
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Extraction of Superelastic Parameter Values from Instrumented Indentation Data
… progress in that area recently, using FEM simulation to predict indentation outcomes, evaluating the “goodness of fit” for particular sets of parameter values and converging on a best-fit combination. A similar approach can be used to obtain superelastic parameters, but little work has …
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Ultrasound shear wave elastography imaging with external mechanical vibration
… prototyped and tested. Finite element method (FEM) simulation and analysis shows the sinusoidal vibration generates shear waves that are constructive across the center plane of the two balls. By tracking the local displacement profiles at different depths of the center plane, shear wave speeds …
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A micromachined magnetic field sensor for low power electronic compass applications
… as well as with Finite Element Method (FEM) simulation, and confirmed with measurement results. These nonlinearity based sensitivity enhancement mechanisms are utilized in the device design. The complete magnetic sensing system consumes less than 200 microwatts of power in continuous …
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Performance of laser assisted micro-milling (laμmill) of titanium alloy using micro ball end mill
… titanium alloy Ti6Al4V. Finite element method (FEM) simulation of preheating was used to determine the machining parameters and the cutting tool to laser beam distance. The performance of laser assisted micro milling using micro ball end mill was evaluated via experimental works using various …
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Thermal Degradation of PC and PA6 During Laser Transmission Welding (LTW)
… data obtained from a Finite Element Method (FEM) simulation of the LTW process to predict material degradation during LTW. The predicted degradation was then compared with experimental data. It is found that the predicted onset of material degradation is in good agreement with experimentally …
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Seismic Behavior of concrete filled steel Tubular Built-up columns
… corresponding validated finite element model (FEM) simulations are developed for parametric analysis, to discuss the hysteretic behavior, affected by axial load ratio, chord spacing, brace spacing, diameter to thickness ratio, and steel yield strength. Results indicate that the hysteretic …
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Tooling performance in micro milling: Modelling, simulation and experimental study
… helix angle, has been proposed for modelling and simulation of the micro milling process. Validation through well-designed micro milling trials demonstrates that the approach is capable of characterizing the milling process effectively. With the support of FEM simulation developed, the tooling …
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Electroquasistatic sensors for surface and subsurface nano-imaging of integrated circuit features
The following thesis relates to the design, simulation, and testing of electroquasistatic (EQS) sensors to be used for feature/defect location and imaging. The aim of this thesis is to launch an investigation into the use of EQS sensor arrays for non-destructive evaluation and quality control …
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Nonlinear Dynamics of Circular Plates under Electrical Loadings for Capacitive Micromachined Ultrasonic Transducers (CMUTs)
… was validated by using data from experiments and simulations performed on silicon-based microelectromechanical systems (MEMS). For example, the pull-in voltages differed by about 1% from values produced by full 3-D MEMS simulations. The macromodel was then used to investigate the response of an …
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Computer-Aided Formulation of Magnetic Pastes for Magnetic Components in Power Electronics
… pastes. The discrete element method (DEM) simulation was explored to create materials' microstructure and the finite element method (FEM) simulation was utilized to study the magnetic permeability based on the microstructure created by DEM or taken from an actual material sample. The …
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