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 “"Frequency Response Analysis"”.
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Nonlinear vibration and frequency response analysis of piezoelectric-based nanotube resonators
… flow and structure curvature are developed. The frequency responses of proposed models for both free and forced vibrations under single frequency, multi-frequency and parametric excitations are investigated. The Hamiltonian principle and Lagrangian method are associated with non-local …
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Investigating the application of frequency response analysis for diagnosing tap changer on power transformer
… using FRA is still lacking. This thesis adapts, frequency response analysis which is proven to be a powerful and globally popular diagnostic tool in detecting power transformer mechanical integrity. Since this method is comparative, thus interpretation of FRA signal is still challenge and …
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Application of Sweep Frequency Response Analysis and Locked-Rotor Test for Stator Winding Inter-Turn and Broken Rotor Bar Fault Detection of Squirrel-Cage Induction Motors
… popular techniques is motor current signature analysis (MCSA) [9]- [10], which analyses the spectral content of the stator current in determining the state of health. A popular technique for assessing the stator winding insulation is the DC Hipot test, which involves applying a dc voltage …
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Investigating inter-turn fault in transformer using TTR and FRA
… is the basic method used. On the other hand, frequency response analysis has been recognized to monitor the mechanical condition of the transformer winding. The frequency response analysis method can be conducted in four measurement connection. They are end to end open circuit test, end to end …
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Alguns aspectos da análise dinâmica de estruturas offshore
… work deals with the Deterministic Dynamic Analysis of Offshore Structures, by the: - Frequency Response Method; - Direct Integration Method. A study was done trying to identify the basic problems in order to make certain simplifications. These producted a better computacional efficiency. A …
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Computational Modal Analysis of Prestressed Half Scale Generic Business Jet Substructures
Computational modal analysis via finite element analysis is a well-established method for modal parameter estimation. The resultant modal parameters are crucial inputs for vibro-acoustic finite element analyses and require accurate modal models. The work presented here aims to provide insight into …
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Stress and reliability analysis of multilayered composite cylinder under thermal and mechanical loads
… parameters is examined in the thermal stress analysis of a long, hollow, multilayered, isotropic composite cylinder subjected to sudden axisymmetric external and internal temperature. The method of complex frequency response functions together with the Fourier transform technique is utilized. …
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The design of skin friction gages for measurements in high-speed, short-duration flows
… the output caused by Mach 2 unheated flow. Frequency response analysis was also performed on the floating element and sputtered design to determine their ability to make measurements in the millisecond time range. Temperature and normal pressure effects were a source of measurement error, …
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Linear Modeling and Analysis of Thermoacoustic Instabilities in a Gas Turbine Combustor
… an open-loop transfer function depicting the frequency response of the thermoacoustic system. These blocks include the system acoustic response to unsteady heat release forcing, the air-side coupling of acoustic particle velocity to inlet fuel mass fraction, transport delays present in the …
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Durability Analysis of Helical Coil Spring in Vehicle Suspension Systems
… and ride quality by scaling down the vibration responses resulting from road surface's roughness. This research focuses on fatigue life analysis of coil spring component. Static linear analysis is conducted on the 3D model of helical coil spring to investigate deformation and stress responses. …
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Using vibration-based monitoring to detect mass changes in satellites
… to a satellite in orbit for adverse reasons. A frequency response analysis was used to determine the changes in mass and moment of inertia of the space structure based on a change in the natural frequencies of the structure or components of the structure. Feasibility studies were first conducted …
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Sieve plate distillation dynamics
… in benzene composition in the feed stream. The response of each plate was measured in the form of temperature and was converted to a composition response. Frequency response curves were determined for each plate from the pulse response. For the frequency response analysis, the forcing function …
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Computational Modal Analysis Of A Half-Scale Business Jet Fuselage Tail Section
… This may be accomplished by performing modal analysis to derive those relevant properties. For a business jet, an important location of study for vibration is the tail section, as it supports the engine which is a primary source of structure-borne noise. The objective of this research is to …
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Sensitivity analysis with respect to elastic boundary conditions and laser spatial variables within experimental spatial dynamic modeling
… of the finite element model are developed. A frequency response analysis, resulting in a pseudo-dynamic stiffness matrix and the direct method of differentiation are used to obtain the required sensitivities. These sensitivities may be used to update the parameters to obtain a more accurate …
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Computational Modal Analysis of a Hydraulic Pump Support Structure for a Business Aircraft
Computational modal analysis performed using finite element analysis is a well-established method for estimating the modal parameters of complex structures. The work presented here aims to provide an insight into the techniques necessary to model structural components of a business jet fuselage …
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Advanced digital predistortion of power amplifiers for mobile and wireless communications
… based on the least-squares regression method and frequency-response analysis are developed and verified experimentally. The area of implementation and the trade-off between the methods are discussed. Adjustable memoryless digital predistortion technique based on the distortion components iterative …
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Growth dynamics of microorganisms
… of the yeast population were observed in response to step changes in dilution rate and glucose concentrations. Step changes in ammonium sulfate or in total medium concentrations resulted in smooth responses to a new population level. To investigate the complex responses to dilution rate …
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Improvement of distribution transformer fault analysis using FRA method
… crucial to continuously monitor its condition. Frequency Response Analysis (FRA) is an advanced electrical test, which is commonly employed to investigate the transformer’s main winding. Moreover, it has been shown to be sensitive to non-mechanical changes such as winding insulation. The …
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Design and development of a composite frequency response analyser
This thesis examines the role that composite frequency test signals play in system identification. The advantages and disadvantages of composite frequency response analysers over conventional analysers are discussed. Two low peak-factor composite frequency test signals are reviewed which largely …
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Dynamic Analysis Of Turbine-generator-foundation Systems
… layered medium over a rigid bedrock. The analysis is conducted in frequency domain through complex frequency response analysis. The response in time domain is obtained by Fourier transform. The seismic excitation is represented as the control motion on the ground surface, which is …
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