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 “"modal response"”.
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Modal Response of a Transonic Fan Blade to Periodic Inlet Pressure Distortion
… new method for predicting forced vibratory blade response to total pressure distortion has been developed using modal and harmonic analysis. Total pressure distortions occur in gas turbine engines when the incoming airflow is partially blocked or disturbed. Distorted inlet conditions can have …
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Structural Damage Detection and Assessment From Spatially Sparse and Noise -Polluted Modal Response
… a parameter estimation method using the measured modal response of a structure. Damage is characterized by a reduction in a constitutive property of a parameterized finite-element model of the structure between two discrete time inferences. A parameter group-updating scheme is proposed to localize …
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Analysis, shape sensitivities and approximations of modal response of generally laminated tapered skew plates
not available until scanned
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The development of kinetic models and simulation methods to study molecular fluctuations, modal response, shock-laminar separation bubble instabilities
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Experimental and analytical assessment of cavity modes in a gas turbine wheelspace
High response pressure data from a high-speed 1.5-stage turbine Hot Gas Ingestion Rig shows the existence of cavity modes in the rim-seal-wheelspace cavity for representative turbine engine operating conditions with purge flow. The experimental results and observations are complemented by …
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Examination of the application and limitations of structural mode extraction via force apportionment
… can be determined by examining the structural response as measured by laser vibrometry. First, the structure is investigated using impact-test-based modal extraction methods. Approximate mode shapes are determined by examining the phase resonance indicator function for the resonance responses …
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Active damping of a structure with low-frequency and closely- spaced modes: experiments and theory
… A spatial filtering method for determining the modal response of the structure from the physical response is also investigated.
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Relationship between prosocial moral reasoning, prosocial behavior, family functioning and social maturity in pre-primary school children
… about helping and sharing. (Moral R.). All responses of the children were coded by the researcher and an independent coder. Assessment of the extent of the children's own naturally occurring prosocial behavior was by the completion of a Likert-type rating scale (Pros. B.R.) by the teachers …
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Intuitive Numerical Information Processes in Consumer Judgment
… tendency, I demonstrate that consumers use the modal response to judge what is typical, with implications for consumers’ inferences about product ratings and other social distributions.
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System identification of adaptive composites
… used to determine these parameters from the modal response of a structure are generically called ‘System Identification’. This thesis reviews the various System Identification techniques applicable to vibrating structures. Three techniques are then adapted to an orthotropic laminate and …
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Seismic Performance Comparison of a Fixed-Base Versus a Base-Isolated Office Building
… design phase, each structure is designed using modal response spectrum analysis in ETABS. In the analysis phase, nonlinear time history analyses at DBE and MCE levels are conducted in PERFORM-3D to obtain the related floor accelerations and interstory drifts. Finally, in the performance …
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"Courage First" : dissent, debate, and the origins of US responsiveness to mass killing
… examination of history reveals that although the modal response of the United States is indeed to refrain from devoting significant resources to these crises, at times the United States reverses course to pursue policies aimed at assisting victims of atrocity. Previous analyses have not fully …
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Nonlinear stochastic vibration in geometrically varying beams
… ordinary differential equations in terms of the modal response functions, which are coupled through the nonlinear terms. The normal modes are found by the finite element method. The differential equations are then converted to a set of Ito's equations, from which a set of first-order differential …
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Modeling and Analysis Methods for ESD and EMI Problems
… captures the most important behaviors of the TVS response using a limited number of parameters, allowing the model to be tuned relatively easily using data obtained only from package-level transient and quasi-static measurements. Second, a phaseless EMI source imaging method is proposed based on …
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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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Bailing and jailing the fast and frugal way : an application of social judgement theory and simple heuristics to English magistrates' remand decisions
… decisions, and all showed disagreement from the modal response on some cases. Bail information schemes did not affect magistrates' decisions, although they did increase their post-decisional confidence. In fact, all magistrates were highly confident in their decisions. Although there were some …
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Non-linear dynamic modeling using component mode synthesis
… is that only linear or non-linear elastic responses can be modeled, requiring a different analysis technique for problems with geometric or material non-linearity. In this dissertation, a framework is developed to couple non-linear material behavior with a fixed interface CMS technique. …
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Meeting the psychosocial needs of refugees and asylum-seekers in South Africa: prespective of NGO service providers
… for help, as well as the service provision responses to these needs. In order to do this, a qualitative study focusing on service providers' perceptions about the psychosocial needs of refugees and asylum-seekers in Cape Town, and of service responses to these needs, was conducted. A …
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A method of determining modal residues using an improved residual model and least squares
… improved residual model to iteratively determine modal residues. The motivation for such a technique is to determine modal parameters rapidly so that, as data acquisition techniques become faster, more structural degrees of freedom can be measured without significantly slowing down the parameter …
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Modal Analysis of the Ice-Structure Interaction Problem
… et al. (1969, 1971), assumed that the primary response of the structure would be in its fundamental mode of vibration. In order to glean a greater physical understanding of ice-structure interaction phenomena, it was critical that this study set out to develop a multi-mode forced response for …
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