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 24 for “"Hysteresis Model"”.
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A Hysteresis Model for Reinforced Concrete Space Frame Structures
A hysteresis model to simulate the behavior of reinforced concrete columns subjected to biaxial bending and varying axial load is proposed. The model, identified as the U-model, is based on cross-sectional properties. The U-model combines the Otani's modification of the Clough model and the Ziegler …
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Seismic In-Plane Response of Reinforced Concrete Frames with Masonry Infill Walls
… dynamically evolved captive column mode. A new hysteresis model is developed for RC frames with infill walls to investigate the ultimate damage state given a ground motion. The hysteresis model is compared with data from experiments by other researchers. The approach and hysteresis model result …
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Design and control methods for high-accuracy variable reluctance actuators
… of a novel method to estimate actuator hysteresis in real-time, and the development of an actuator model that incorporates the effects of eddy currents. The reticle stage in a scanning lithography machine requires high accelerations combined with sub-nanometer position accuracy. …
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Modeling and robust adaptive control of metal cutting via application of piezoactuator
… of piezoactuator, a much more accurate model is required for achieving the ultra-precision control. In this thesis, rather than using the commonly accepted linear Merchant model, the relationship of cutting force and chip thickness variations is explored as a nonlinear hysteresis model. …
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Hysteresis modeling of wood joints and structural systems
… must be known and the hysteretic behavior modeled properly. This thesis presents a general hysteresis model for wood joints and structural systems, based on a modification of the Bouc-Wen-Baber-Noori (BWBN) model. The hysteretic constitutive law, based on the endochronic theory of …
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Experimental investigation of the response of reinforced concrete structural walls subjected to static and dynamic loading
… of structural walls, and the development of a hysteresis model for the nonlinear response history analysis of R/C wall elements.
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Dynamic recurrent neural networks for stable adaptive control of wing rock motion
… concept based on the properties of the Presiach hysteresis model is used in the design of dynamic neural networks. The structure and memory mechanism in the Preisach model is analogous to the parallel connectivity and memory formation in the RBF neural networks. The proposed dynamic recurrent …
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Seismic Performance Assessment of Wood-Frame Shear Wall Structures
… wall building designs under the influence of modeling and analysis parameter variations. The first step towards the broad objective of seismic performance evaluation is to identify the different modeling and analysis parameters that can have a potential influence in the seismic response …
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The First Passage Problem in Random Vibration for a Simple Hysteretic Oscillator
… oscillator, incorporating the modified Bouc hysteresis model, has been developed. Two boundary value problems are formulated from Markov process theory and solved by a Petrov-Galerkin finite element method. The first is known as a generalized Pontriagin-Vitt equation, which when solved yields …
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Stochastic dynamic response of wood structural systems
… must be known and the hysteretic behavior modeled properly. This dissertation presents a general hysteresis model for wood joints and structural systems, based on a modification of the Bouc-Wen-Baber-Noori (BWBN) model. The hysteretic constitutive law, based on the endochronic theory of …
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High-performance ferrite nanoparticles for magnetothermal neural excitation
… structures. We first develop a general dynamic hysteresis model that can qualitatively predict loss power trends for ferrite nanoparticles of variable size and chemical composition in the presence of clinically relevant field frequencies and amplitudes. We then identify synthesis strategies to …
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Simulated Response of Degrading Hysteretic Joints With Slack Behavior
A novel, general, numerical model is described that is capable of predicting the load-displacement relationship up to and at failure of multiple-bolt joints in timber of various configurations. The model is not tied to a single input function and bolt holes are permitted to be drilled oversize …
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Self-bearing motor design & control
… the design and experimental demonstration of hysteresis self-bearing motors, novel segmented stator structures, MIMO loop shaping control algorithm for levitation and commutation, hysteresis motor analysis including frequency dependency, nonlinear hysteresis model including loop widening, and …
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Simulative Analyse zum Hystereseverhalten von Phasenwechselmedien in Latentwärmespeichern anhand des thermischen Leistungsverlaufs
… account already in the design and thus in the modeling stage. A special property of PCM is the hysteresis, which describes the phenomenon that the crystallization process takes place at a lower temperature than the melting process. The model-based consideration of the hysteresis behavior …
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Characterisation and Modelling for Elastomeric and Gel-Like Magnetorheological Materials
… issue. Moreover, an improved magnetic circuit model is proposed to serve as an effective and efficient approach for designing and analysing MR elastomer devices with complicated structures, i.e., hybrid magnets and laminated structure. In a pioneering manner, the field-dependent dynamic …
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An Assessment of Radiative, Energy and Carbon Dioxide Fluxes over Three Urban Locations in Dublin
… locations and is estimated using the Objective Hysteresis Model (OHM). The occurrence of unstable atmospheric conditions increased with increasing built and impervious surface cover fraction however neutral stratification was dominant. Temporal analysis of the CO2 flux indicates photosynthetic …
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MR dampers in smart structures with nonlinear non-affine dynamics improvising intelligent control
… steel frame and a benchmark five-storey building model integrated with MR dampers are used in this research. These smart structures are subject to scaled earthquake vibrations excited by a shake table. A static hysteresis model is adopted for the MR damper, in which current-dependent nonlinear …
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Modelling the Post-Peak Response of Existing Reinforced Concrete Frame Structures Subjected to Seismic Loading
… the initiation of shear failure. A novel shear hysteresis model is proposed employing these relationships, based on experimental observations that deformations after the onset of shear failure tend to concentrate in a specific member region. A computationally efficient finite element model of …
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Quantifying factors that influence road deicer retention and export in a multi-landuse Upstate New York watershed
… scales. Chloride concentration changes were then modelled under varying pollutant loading scenarios through an integrated catchment model (INCA-Cl).</p> <p>Six in-stream conductivity/stage/temperature sondes, recording at 15-minute intervals, were installed within the small (~9.6 km2) Fuler Hollow …
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Magnetically suspended reaction sphere with one-axis hysteresis drive
This thesis presents the design, modeling, implementation, and control of a magnetically suspended reaction sphere with one-axis hysteresis drive (1D-MSRS). The goal of this project is two fold: (a) exploring the design for a reaction sphere in 3D for spacecraft's attitude control, and (b) studying …
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