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 198 for “"response function"”.
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Damage detection in structures using measured frequency response function data
Modern engineering structures such as offshore oil platforms, transmission towers, bridges and aircraft frames are regularly monitored and maintained in order to avert catastrophic failure. Despite our best efforts, sporadic failures, which may have disastrous consequences in terms of human life …
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Experimental determination of the impulse response function for elastic vibrating systems
… for determination and analysis of the impulse response function of linear, elastic, vibrating systems is developed. A deconvolution method is developed for estimation of the impulse response function. The estimator is shown to be unbiased in the presence of measurement noise. Modal parameters …
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Developments in the theory and applications of the variability response function concept
… their spatial correlation structures. In response to this limitation, researchers have sought a means to circumventing the need for a full probabilistic description of system uncertainties in determining structural response statistics. One approach is the Variability Response Function(VRF) …
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Damage detection in structures using frequency response function (FRF) data and finite element modelling
… to detect structural damage using frequency response function (FRF) data obtained from non-destructive vibration tests. The method is used to study cases of early structural damage in which there is no appreciable change in mass and damping. The resulting change in structural stiffness matrix …
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Data Reduction Procedure for an Experimental Method of Measuring the Velocity-Coupled Response Function of Solid Propellants
… for calculation of the velocity-coupled response function of solid-propellants from experimentally measured pressure data. The proposed velocity-coupled response function measurement apparatus consists of an end-burner combustor where the propellant sample is oscillated in a direction …
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Confidence bands, measurement noise, and multiple input - multiple output measurements using three-channel frequency response function estimator
A three-channel Frequency Response Function (FRF) estimator is discussed and statistical relations developed. Methods for estimating the variance of the FRF magnitude and levels of uncorrelated content in the test signals are developed. FRF magnitude variance estimates allow ’confidence bands’ to …
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Identification and Characterization of the DNA Damage Response Function of Human Rif1 and a Search For Human Rap1 Interacting Factors
… foci that co-localized with other DNA damage response factors such as 53BP1, ATM, BRCA1, Chkl, Nbsl, and Rad 17. Furthermore, Rifl localized to uncapped telomeres, as do other DNA damage response factors. Among DNA damage response proteins, Rifl showed a unique dependence on the ATM kinase. …
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Quality Assurance Testing, and Sensitivity Studies for the SNO+ Experment
… the impact of non- gaussian tails in the energy response function on the half-life limit for neutrinoless beta decay was studied. If the tails were not applied to the energy response function the sensitivity is expected to be reduced by 0.5x10^26y. If the tails are applied to the response …
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Screening and the effective fine structure constant in graphene
… are proportional to the imaginary part of the response function of graphite, to the full response function of graphene. We compare these results to calculated response functions in the random phase approximation (RPA) with and without interlayer hopping terms, and determine that interlayer …
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A Stochastic Approach to Modeling Aviation Security Problems Using the KNAPSACK Problem
… of the joint conditional probability density functions for the security device responses. Two sampling procedures, the static grid estimation procedure and the dynamic grid estimation procedure, are proposed to estimate these functions. The concept of a system response function is introduced …
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Validation of statistical methods used in task fMRI studies
Functional Magnetic Resonance Imaging (fMRI) is a non-invasive tool used to investigate brain function. The processing of fMRI data consists of multiple steps and the final results often depend greatly on the specific choice of options used: for example, head motion correction, slice timing …
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Frequency Domain Methods for Predicting the Transport of Non-Uniform Flow Through Turbomachinery Compressors
… characteristics, described by a frequency response function, are obtained from experimental data and are related to fundamental blade row flow phenomena. When excited by a total pressure distribution with unknown response, the blade row's frequency response function can serve to predict the …
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Experimental Investigation of Ultrafast Hydration Structure and Dynamics at Sub-Angstrom Lengthscales
… to measure the dynamical density-density linear response function for liquid water with Angstrom spatial resolution and 50fs temporal resolution. The results are compared to high-resolution spectroscopic and scattering experiments and simulations on liquid water to relate observed density …
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Determination of thermal neutron capture gamma yields.
… used involve the determination of a peak response function suitable for the Ge(Li) pair spectrometer spectra being studied. The response function is used to strip off the effects of the peaks upon the background and unresolved data continuum. The continuum, which is due only to the …
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Damage Detection in Aluminum Cylinders Using Modal Analysis
… damage by examining differences in the frequency response functions of a structure before and after damage. In an experimental setting, this variation can not be attributed solely to the addition of damage. Other sources of variation include testing and structure variation. Examples of testing …
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A response surface approach to data analysis in robust parameter design
It has become obvious that combined arrays and a response surface approach can be effective tools in our quest to reduce (process) variability. An important aspect of the improvement of quality is to suppress the magnitude of the influence coming from subtle changes of noise factors. To model and …
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Oscillatory Behavior of Fine AP/HTPB Composite Propellants
… plateau propellants. The unsteady combustion response was measured using the laser-recoil method. It was found that at 1 atm monomodal fuel rich propellants containing fine AP (representative of the pocket propellant in the bimodal propellants) exhibit both a low frequency combustion response …
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Iterative path integral calculations of non-linear spectra and entanglement dynamics
… systems. We compute four-time correlation functions which are used to calculate response functions relevant to third order infrared or seventh order Raman experiments for harmonic, Morse, and quadratic-quartic potentials. Our calculations reveal the role of potential features (anharmonicity …
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System modeling and modification via modal analysis
… The resonance specification and frequency response function synthesis are two useful techniques that aid in system modification and are, therefore, included. A resonant peak can be shifted to another frequency by making certain modifications to the structure, thus avoiding undesired …
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Neural mechanisms of attention to motion
… account the effect of attention: contrast gain, response gain and baseline shift. However, psychophysical and neuroimaging studies produced results that are not always consistent. We used the functional magnetic resonance imaging (fMRI) to explore how attention alters the appearance of coherently …
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