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 14 of 14 for “"FREQUENCY DOMAIN METHOD"”.
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A Frequency-Domain Method for Active Acoustic Cancellation of Known Audio Sources
… as in the case of a song. This thesis presents a method for active acoustic cancellation of a known audio signal using the frequency characteristics of the known audio signal compared to that of a sampled, filtered excerpt of the same known audio signal.</p> <p>In this procedure, we must first …
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Parallel implementation of an algorithm for high resolution range profiling using a stepped frequency radar
… describes the implementation and analysis of a frequency domain approach for reconstructing wide-bandwidth high resoultion range profiles using stepped-frequency waveforms. In order to minimize the overall processing time, a parallel algorithm was developed and tested in a homogeneous cluster of …
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Extracting room acoustic parameters from received speech signals using artificial neural networks
… sounds - speech - as excitations, the developed methods circumvent the use of unpleasant noisy test signals and therefore measurements can be made in occupied spaces in a non-invasive fashion. Given the non-invasive nature and achievable accuracy, the new methods can facilitate occupied …
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Optimization of the assessment of cerebral autoregulation in neurocritical care unit
… or oedema of the brain. Over the years, various methods for CA assessment have been proposed, while most commonly used parameters include the autoregulation index (ARI), which grades CA into ten levels; transfer function (TF) analysis, describing CA as a high pass filter; the mean flow index …
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Channel Modelling of Blood Capillary-based Molecular Communication
… to describe the propagation process with a frequency domain method being proposed to calculate the information-theoretical performance channel capacity. Secondly, a much more realistic blood capillary model with blood flow drift which matches a laminar flow regime is presented, where a …
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Numerical and experimental modelling of microwave applicators
This thesis presents a time domain finite element method for the solution of microwave heating problems. This is the first time that this particular technique has been applied to microwave heating. It is found that the standard frequency domain finite element method is unsuitable for analysing …
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Algorithm for Spectral Matching of Earthquake Ground Motions using Wavelets and Broyden Updating
… the real strong ground motions in the time domain by adding wavelets adjustment to the acceleration time series. The spectral matching procedure is at its core a nonlinear problem, thus a nonlinear solving method was employed in the proposed algorithm. The Broyden updating method was …
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Parameter robust reduced-order control of flexible structures
… Tahk and Speyer, to arrive at two new LQG-based methods of parameter robust control. One component of the robustness procedure, common to both methods, is the application of an auxiliary cost functional penalty to desensitize the system to variations in selected parameters of the state-space …
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A new method for harmonic penetration study in power networks with renewable generation
… is conducted on existing harmonic power flow methods. The previous approaches require long computing time and encounter convergence problem because of poor initial value. They are only applied to small or medium power systems with a single harmonic source. A new fast hybrid method (FHM) is …
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Modelling and analysis of complex electromagnetic problems using FDTD subgridding in hybrid computational methods. Development of hybridised Method of Moments, Finite-Difference Time-Domain method and subgridded Finite-Difference Time-Domain method for precise computation of electromagnetic interaction with arbitrarily complex geometries
… hybridised computational technique combining the frequency domain Method of Moments (MoM), Finite-Difference Time-Domain (FDTD) method and a subgridded Finite-Difference Time-Domain (SGFDTD) method. This facilitates a significant advance in the ability to predict electromagnetic absorption in …
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Finite Element Modeling for Prediction of Low Frequency Floor Vibrations Due to Walking
… America typically use the AISC Design Guide 11 methods to check this limit state, but its methods are difficult to apply to atypical floor framing. Finite element analysis is a logical choice for predicting vibration response to walking, but simplified designer-friendly procedures are not …
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Development of the Spectral-Analysis-of-Body-Waves (SABW) method for downhole seismic testing with boreholes or penetrometers
… sensors, sources, test procedures and analytical methods being used. In these tests, the time differences of first-arrivals 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 …
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Control design and energy optimisation of a buoyant airborne wind turbine
… the development of a PID controller using two methods, a frequency domain method known as MPID and an optimal control scheme, LQR. The results of this chapter inform the interaction of the controller with the underlying plant dynamics. Finally, the broader issue of BAWT optimisation is …
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Aspects of stepped-frequency processing for low-frequency SAR systems
… to investigate the following two aspects of low-frequency (VHF/UHF-band) SAR processing: 1. The use of stepped-frequency waveforms to increase the total radar bandwidth, thereby increasing the range resolution, and 2. Radio frequency interference (RFI) suppression. A stepped-frequency system owes …