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Showing 1 to 14 of 14 for “"Preisach"”.
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Parameter Identification for the Preisach Model of Hysteresis
… practical information on the subject. The Preisach operator was developed to model hysteresis in magnetism. It is based on a continuous linear combination of relay operators weighted by a distribution function μ. A new method for approximating μ in a finite dimensional space is described. …
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Analysis of Hysteretic Systems: Preisach Formalism and Bouc-Wen Modeling
… data. Two major models of hysteresis are the Preisach and Bouc-Wen models. As researchers typically deal with solely one model for their analyses, this thesis initially develops techniques to convert from the Bouc-Wen model to the Preisach model, using first a least squares fit followed by …
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Modeling the United States Unemployment Rate with the Preisach Model of Hysteresis
… describe systems with hysteresis, we use the Preisach model. A discussion of the Preisach model is given as well as a method for computing the hysteretic transformation of an input variable. The focus of this paper is hysteresis in economics, namely, unemployment. We consider essential time …
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Differential and numerical models of hysteretic systems with stochastic and deterministic inputs
… equations where the time derivative of the Preisach operator is included in one of the equations. A model of two phenotype bacteria is also presented. This model is examined to explore memory effects and related hysteresis effects in the area of biology. The memory effects found in this …
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Dynamic recurrent neural networks for stable adaptive control of wing rock motion
… 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 neural network has a feature for adding or pruning the neurons in the hidden layer according to the growth …
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Two Methods for Modeling Scalar Hysteresis and their use in Controlling Actuators with Hysteresis
… is modeled by a generic model based on a Preisach type operator. First, it is shown that the operator has an inverse and that both have approximations that are convergent. Then, simulation and experimental data are used to demonstrate the ability of the operator to accurately model a …
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An investigation of space suit mobility with applications to EVA operations
… data, a mathematical model using the Preisach hysteresis modeling technique is developed to predict joint torque from the joint angle history. Two physics-based models describing the bending load-deflection characteristics of pressurized fabric cylinders were compared to the …
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Towards Structural Health Monitoring of Gossamer Structures Using Conductive Polymer Nanocomposite Sensors
… on the modified fractional calculus and the Preisach approaches, have been developed to model the variation of electrical resistance with strain in a conductive polymer. After that, a compensator based on a modified Preisach model has been developed. The compensator removes the effect of …
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Aerodynamic and Electromechanical Design, Modeling and Implementation Of Piezocomposite Airfoils
… response using a phenomenological classical Preisach model. The classical Preisach model is capable of predicting the hysteresis observed in 1) two cantilevered bimorph beams, 2) the simply-supported thin airfoil, and 3) the cascading bimorph thick airfoil.
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Nonlinear Mechanical and Actuation Characterization of Piezoceramic Fiber Composites
… amplitude and applied stress. In addition, a Preisach model is developed that uses the collected data sets to predict the hysteretic piezoelectric behavior of the MFC. Lastly, other related topics, such as manufacturing, cure kinetics modeling and linear thermoelasticity of the Macro Fiber …
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Compliant, Large-Strain, and Self-Sensing Twisted String Actuators with Applications to Soft Robots
… properties are accurately captured by Preisach hysteresis operators. Next, a data-driven mathematical model was proposed and experimentally validated to capture the transient decay, creep, and hysteretic effects in the electrical resistance. This model was then used to predict the …
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Design and control methods for high-accuracy variable reluctance actuators
… effect of the air gap directly into a Preisach hysteresis model via a change of variables. We demonstrate experimentally that this method is numerically stable in the presence of a dynamically changing gap, in contrast to some alternative methods. We designed and built a reluctance …
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Advancing Multi-Axis Force/Torque Sensing via Beam Optimization, Self-Decoupling Mechanisms, and Morphing-Based Mechanical Intelligence
… and history-dependent behaviors, a generalized Preisach hysteresis model and its inverse are formulated, relaxing classical assumptions and identifying a two-dimensional density function directly from experimental data. This approach accurately reproduces measured force-voltage loops, and the …
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Observer Design for Non-Monotonic Nonlinear Systems and Interesting Contemporary Applications
… method loses observability and a modified Preisach method is suggested as an alternative. Then a nonlinear Lipschitz observer is designed for this application, and it is shown that the observer provides accurate SoC estimates based on experimental data in the presence of hysteresis. Another …