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.
Results
Showing 1 to 20 of 42 for “"curve-fit"”.
-
A Finite Element, Reduced Order, Frequency Dependent Model of Viscoelastic Damping
… physical data into the model in the form of a curve fit of the complex modulus. This curve fit is expressed by minioscillators. The frequency dependence of the complex modulus is accounted for by the addition of internal, or dissipation, coordinates. The dissipation coordinates make the …
-
Multiobjective Optimization and Analysis of Slotted Waveguide Antenna Stiffened Structures
… but the development of a concentration factor curve fit accounted for these in the optimization procedure and filled in a gap in the current literature. The models are then optimized, exposing a weakness in that these stress concentrations would lead to failure well before buckling in most …
-
Change Request Prediction and Effort Estimation in an Evolving Software System
… has been done in defect prediction using curve-fitting methods evolving software systems, with one or more change-points. Curve-fitting approaches have been successfully used to select a fitted reliability model among candidate models for defect prediction. This work demonstrates the use …
-
Discretization Error Estimation and Exact Solution Generation Using the 2D Method of Nearby Problems
… solution to the original problem of interest, curve fitting the solution, and generating source terms by operating the governing PDEs upon the curve fit. Adding these source terms to the right-hand-side of the governing PDEs defines the nearby problem. In addition to its use for generating …
-
The Development of a Multi-Directional Wear Apparatus and the Characterization and Correlation of Biomechanical and Biotribological Properties of Bovine Articular Cartilage
… Quasi-linear viscoelastic theory was used to curve-fit the stress relaxation data, while the dynamic data was used to determine the dynamic properties through Fast Fourier Transform analysis and verify the assumptions posed with the QLV theory.Overall tissue compression was significantly …
-
Valve characterization to implement feed-forward control of hydraulically actuated joints
… the empirical results, a quadratic and bi-linear curve fit to the data provided a practical solution to an otherwise computationally expensive problem.
-
Dynamic load modeling in power system analysis
… or constant current load models. A least-squares curve fit algorithm is developed and used in modeling static and quasi-static loads as a function of the bus voltage. A dynamic model for the induction machine which accounts for rotor electrical and mechanical transients is incorporated into the …
-
Structural loading of cross deck connections for trimaran vessels
… longitudinal placement. The design loadings were curve fit to a fourth order polynomial in the three independent variables.
-
A numerical simulation of pressure distribution and radius of drainage in infinite radial aquifers - constant rate case
… is developed from the least squares polynomial curve fit of PD' = .01. additionally, an on-line mapping technique is presented which permits the aquifer pressure distribution to be displayed graphically on the I.B.M. 360/50 On-Line Printer"--Abstract, page ii.
-
Development and evaluation of a stream temperature component within the PRMS watershed modeling program
… and matched all parameters of a regression curve fit of natural data to within 6 percent with a determination coefficient (R[superscript 2]) of .77. A sensitivity analysis run using the Fourier Amplitude Sensitivity Testing (FAST) technique suggested that the most sensitive factors are solar …
-
Derivation of Moving-Coil Loudspeaker Parameters Using Plane Wave Tube Techniques
… technique. Models have been developed to curve fit the resulting data, from which small-signal loudspeaker parameters are subsequently derived. This thesis discusses the acoustical measurement theory, apparatus, and system modeling methods (via equivalent circuits). It also compares …
-
Accurate And Efficient Reliability Analysis Of Complex Structural Engineering Problems
… samples included exploring the use of various curve-fit methods and developing an optimized ensemble technique to maximize accuracy of the failure probability calculation. The Markov Chain Monte Carlo method was investigated with an aim to further reduce the computational effort of FS. …
-
Random forests and their application to heteroscedastic drug design data
… when and why pruning is required to prevent overfitting in random forests. These novel explanations for random forest performance enable us to provide practical recommendations for selecting model parameters. These can give specific guidance about how and when to tune different parameters based …
-
Injection locking characteristics of indium arsenide quantum dash lasers
… a large nonlinear gain coefficient, ε. Using a curve fit of the α versus power curve taken from the injection locking data, ε was measured to be 1.4*10-14 cm3, 1000 times larger than the typical ε of quantum well lasers, changing the dynamics of the laser. The small α-parameter and giant ε …
-
Conservation and Expressive/Receptive Language Abilities in Normal and Disabled Readers
… not found to be significant. However, a power curve fit yielded correlation coefficients that were significant at the .01 level. The results of the study indicate that perphaps reading models based on a psycholinguistic and cognitive approach should be employed. And, the results of the study …
-
Hot-Wire Anemometer for the Boundary Layer Data System
… was calibrated in a steady jet and a power-law curve fit accurately represented the calibration data. The CVA successfully measured velocity fluctuations in a turbulent jet, as well as in laminar and tripped turbulent boundary layers over a flat plate in a 110 MPH wind tunnel. CVA frequency …
-
An Investigation of the Feasibility of Microscale Adaptive Passive Vibration Neutralizers
… results. A tuning algorithm is derived from a curve-fit of experimental tests on the specific neutralizer. A more generic tuning algorithm is also developed, which does not require testing of the neutralizer for optimal control. Both tuning algorithms are tested using a chirp forcing function …
-
Characterization of OMVPE-grown GaSb-based epilayers using in situ reflectance and ex situ TEM
… reflectance monitoring system was designed and fitted to the OMVPE reactor. It was determined that longer wavelengths are more useful for quantitative growth rate analysis, while shorter wavelengths are more sensitive to the GaSb substrate oxide desorption process. It was also determined that …
-
Prototype Development and Feasibility Assessment of a Vertically Mounted Floating Element Skin Friction Balance
… employed to calibrate the balance using a linear curve fit with a coefficient of determination of R^2 = 0.99, indicating a satisfactory linear estimation.
-
Utility of Quasi-Static Gust Loads Certification Methods for Novel Configurations
… all assumptions are identified. Error of a key curve fit equation is quantified directly. Application dependent errors are quantified by comparing loads calculated using Pratt's Method to loads calculated from transient analysis. To facilitate this effort, a state of the art nonlinear …
Page 1 of 3