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 52 for “"Frequency domain analysis"”.
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A time and frequency domain analysis of contrarian trading strategies/
This thesis applies time and frequency domain analyses to a high-frequency market making strategy to study the profitability of liquidity provision over multiple time horizons from 1964 to 2013. Using daily returns and inside quotes, we provide evidence that widening spreads on the NASDAQ National …
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Frequency-domain analysis of memoryless nonlinearities having large-signal, almost periodic excitations
Numerical frequency-domain techniques are widely used for the a.c. steady-state analysis of nonlinear electric circuits. Such techniques require that one compute the Fourier series for the response of each nonlinear circuit element, given a known excitation. Current approaches to this computation …
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A probabilisitc approach to the frequency domain analysis of drill-string lateral vibrations
… encountered problems. In order to diminish the frequency of such failures, the drilling community has been focusing on the modeling of the static and dynamic behaviors of drill-strings, towards increasing efficiency. Drill-string dynamics involves complex phenomena with excitations in axial, …
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Near aggregation: a time and frequency domain analysis using state trajectories and transfer function residues
… of observability as suggested by Selective Modal Analysis. With this result we then obtain an upper bound on the norm of the transfer function residue using near-unobservability measures. The Generalized Hessenberg Representation (GHR) and Dual GHR are examined throughout this analysis. It is …
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A frequency domain analysis of surface heat transfer/free-stream turbulence interactions in a transonic turbine cascade
… baseline condition. Special emphasis is given to frequency domain analysis of the data via coherence function magnitude and phase, energy spectra, and time auto- arid cross-correlations. Results are presented for both mean and fluctuating velocity and heat flux. Mean heat transfer is highest for …
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Time-frequency domain analysis of exchange rate market integration in Southern Africa Development Community: A Hilbert-Huang Transform approach
… could signal economic integration. Therefore, analysis of similarities, interdependence, and information transfer across exchange rate markets in Southern African Development Community (SADC) is a necessity to measure the extent of integration in the region. However, the intrinsic complexity of …
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Frequency Domain Conductive Electromagnetic Interference Modeling and Prediction with Parasitics Extraction for Inverters
… Transformation (FFT) method with the time-domain simulation result that requires long hours of simulation and a large amount of data. The proposed approach is to use the frequency-domain analysis technique that computes the EMI spectrum directly by decomposing noise sources and their …
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Development of the Spectral-Analysis-of-Body-Waves (SABW) method for downhole seismic testing with boreholes or penetrometers
… or other reference points early in the time-domain signals have been used to calculate shear and compression wave velocities in soil and rock layers. This time-domain method requires an operator to pick the first arrival or other reference point of each seismic wave in the time record. …
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A técnica da linearização equivalente no cálculo da resposta permanente de plataformas marítimas fixas
… of the structure can be determined from a frequency domain analysis. The technique feasibility is investigated by means of some numerical soil structure interaction problems and comparisons between the approximate solution and non linear time domain solution are presented.
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A Mechanistic Force Model and Stability Analysis for Contour Turning
… in axial contour turning are investigated via a frequency domain analysis. Three-dimensional stability-limit diagrams, third dimension being the toolpath, are generated for machining a workpiece with concave-convex contours. The reasons for the stability variations along the toolpath are analyzed …
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Rotordynamic Analysis of Theoretical Models and Experimental Systems
… information for the construction and</p> <p>analysis of rotordynamic theoretical models, and their comparison the experimental</p> <p>systems. Finite Element Method (FEM) is used to construct models using Timoshenko</p> <p>beam elements with viscous and hysteretic internal damping. …
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On low-pass reconstruction and stochastic modeling of PWM signals
… in PWM generation, a similar method for the analysis at the reconstruction end is pursued. In this pursuit, continuous-time low-pass filtering, preceded by oversampling, is analyzed as a linear suboptimal reconstruction mechanism from a PWM signal. Observing the mapping between input samples …
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Evaluation of Pilot and Quadcopter Performance from Open Loop Mission Oriented Flight Testing
… with it. Path error is calculated in time domain to distinguish between pilot levels and level of autonomy of UAV. Path error metrics show that novice pilots make more error than experienced pilots and error increases from more autonomous to less autonomous UAV. For frequency do main …
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Inductive compensation of operational amplifiers in feedback circuits
… stabilized the unstable system. I used frequency domain analysis to determine how much phase margin my compensator added to the system. After characterizing and canceling out the effects of input and output loading, and the attenuation of my output buffer, I found that my compensator …
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Modular development of an educational remote laboratory platform for electrical engineering : the ELVIS iLab
… generator channels and bode analyzer for frequency domain analysis, which was not possible in the previous designs.
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Dynamic modeling of a robotic spacecraft for NASA’s asteroid redirect robotic mission
… manned mission. This thesis presents a detailed analysis of the dynamic modeling of the ARRM spacecraft grasping the boulder. This model is used for three-axis attitude control design and simulation of the system. This thesis presents a 30 degree-of-freedom nonlinear lumped-mass model for the …
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Gradient characterization in magnetic resonance imaging
… linear time-invariant transfer function through frequency-domain analysis and time-domain analysis. A transfer function model of the gradient system on the 3T Siemens Tim Trio scanner is presented here along with the characterization and analysis of common waveform gradients. Possible distortion …
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On the application of PMU measurements to system stability analysis
… for accurate and fast stability monitoring and analysis. To address the application of PMU measurements to stability monitoring, we propose the use of circuit equivalent ideas for both voltage and angle stability. This method is applicable for on-line steady-state stability assessment, without …
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A comparison of logging while drilling (LWD) and wireline acoustic measurements
… tool. We reprocessed sections of the data using frequency semblance methods and compared with layered model results. We found that a frequency-domain analysis is feasible and reduces the overall difference between the LWD and wireline shear and compressional velocity estimates. The remaining …
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