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 15 of 15 for “"Surface fitting"”.
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Reverse Engineering of Aircraft Wing Data Using a Partial Differential Equation Surface Model
… process are data acquisition, data separation, surface or curve fitting, and CAD/CAM production. The surface fitting step determines the design representation of the object, and thus is critical to the success or failure of the reverse engineering process. Although surface fitting methods …
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Accelerating vibrational free energy calculations for anharmonic crystals
… representing the vibrational potential energy surface, fitting the free parameters of that representation using electronic structure theory, and using the fitted representation to calculate the vibrational wavefunctions and the vibrational free energy. A number of developments to the VSCF …
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Efficient automatic correction and segmentation based 3D visualization of magnetic resonance images
… MR inhomogeneity correction algorithm derivative surface fitting (dsf), automatic tissue detection algorithm (atd), and a new fast technique for interactive 3D visualization of segmented volumes called gravitational shading (gs). These newly developed algorithms provided a foundation for the …
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Surface Area Mapping and Rinse Procedures of Raw Produce to Determine Effectiveness of Pathogen Removal
Bacterial pathogens on the surfaces of raw produce may be difficult to remove for identification and enumeration. The first part of this project examined whether ultrasonic treatment (40 kHz) of a rinse solution would enhance recovery of Salmonella spp. from various produce surfaces. Strawberries, …
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Aircraft Multidisciplinary Design Optimization using Design of Experiments Theory and Response Surface Modeling Methods
… classical statistical techniques in response surface modeling and least squares surface fitting to yield polynomial approximation models. The second method, in which only a preliminary investigation has been performed, uses Bayesian statistics and an adaptation of the Kriging process in …
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Intelligent algorithms applied to weather radar based flood forecasting system
… in the emerging area. Within this context, surface fitting, interpolation and cluster analysis were used for adjustment of the weather radar data and comparison between the raingauge data and radar data. As the core of the forecasting system the rainfall runoff model and river routing model …
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The missing link in as-built 3D modeling: geometrical labeling of segmented point clouds for fitting geometrical surface
… user’s desired level of abstraction; and (2) fit surface topologies such as NURBS into the segmented point clouds. While these methods exhibit flexibility in accounting for the user desired level of abstraction, yet they still result in over segmentation. Even if properly segmented, there is still …
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Image-based Fine-scale Infrastructure Monitoring
… and is capable of reconstructing objects or surfaces with homogeneous texture. The scientific contributions of this research work address the drawbacks in currently existing literature. Methods for in-situ multi-camera system calibration and system stability analysis are proposed in addition …
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3-D facial expression representation using statistical shape models
… facial expressions embedded in 3-D facial surfaces. In order to obtain the SSV, a novel model-based surface registration method is proposed that iteratively deforms and matches the model to an unseen new facial surface. Two major stages are included in this method, namely, model building …
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Intelligent Non-destructive Measurement and Evaluation Techniques for Aircraft Composites
… ultrasonic 3D reconstruction, and polynomial fitting techniques for infrared thermography inspection. These researches focus on the improvement and optimization of current ultrasonic testing and infrared thermography inspection. They are independent but interrelated component, and they all …
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Development of a robust numerical optimization methodology for turbine endwalls and effect of endwall contouring on turbine passage performance
… found in the literature. A normalized contoured surface topology was extracted from a previous study that has similar blade design parameters. This surface was then fitted to the turbine passage under study in order to investigate the effect of such trend based surface fitting. Aerodynamic …
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Estimation of Rotational Degrees of Freedom Using Spline Functions
… data using spline functions for curve and surface fitting.The estimation accuracy is found to depend on a number of factors including the spatial distribution of data points, the level of error in the original data and the degree of smoothing applied. Analysis on beam and plate structures …
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Estimation of Rotational Degrees of Freedom Using Spline Functions
… data using spline functions for curve and surface fitting.The estimation accuracy is found to depend on a number of factors including the spatial distribution of data points, the level of error in the original data and the degree of smoothing applied. Analysis on beam and plate structures …
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Automated segmentation, detection and fitting of piping elements from terrestrial LIDAR data
… of piping elements, and (3) cylinder fitting and parameter estimation. The final output of the cylinder fitting stage gives the estimated orientation, position, and radius of each detected pipe element. ^ A robust octree-based split and merge segmentation algorithm is proposed in this …
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Avian assemblages and Red-eyed Vireo nest survival within mineland forest
Since the passage of the Surface Mining Control and Reclamation Act (SMCRA) in 1977, mined lands have generally been reclaimed to an environment characterized by severely compacted minesoils, a growth medium comprised largely of unweathered materials, and a predominance of aggressive groundcovers …