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共 215 条记录，以下是81-90 订阅

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THE modelling OF HYSTERESIS IN MAGNETORHEOLOGICAL DAMPERS USING A GENERALISED PRANDTL-ISHLINSKII APPROACH

THE MODELLING OF HYSTERESIS IN MAGNETORHEOLOGICAL DAMPERS US...

引用

3rd Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures, and Intelligent systems (SMASIS)/symposium on Modeling, Simulation and control

作者： Wang, Kun Zhang, Ying Jones, Richard W. Univ So Denmark Mads Clausen Inst Sonderborg Denmark

ISBN: (纸本)9780791844151

The major drawback of magnetorheological dampers (MR) lies in their non-linear and hysteretic force-velocity response. To take full advantage of the operating characteristics of these devices a high fidelity model is required for control analysis and design. In this contribution the ability of a generalised PI operator-based model to represent the characteristics of a commercially available MR damper is examined. This approach allows the user to define the PI operator to best match the hysteresis characteristics. For the MR damper the force-velcoity hysteresis characteristic is 'S' shaped and constrained. Two possibilities will be examined here for the generalised play operator;an hyperbolic tan function and a symmetric sigmoid function.

关键词： Hysteresis

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ENHANCED PIEZOELECTRIC MULTILAYERED BEAM: modelling, EXPERIMENTAL VALIDATION AND APPLICATION TO ACTUATION

ENHANCED PIEZOELECTRIC MULTILAYERED BEAM: MODELLING, EXPERIM...

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3rd Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures, and Intelligent systems (SMASIS)/symposium on Modeling, Simulation and control

作者： Fernandes, A. Pouget, J. Univ Paris 06 CNRS UMR9170 Inst Jean Le Rond dAlembert F-75252 Paris 05 France

ISBN: (纸本)9780791844151

A coupled Euler-Bernoulli model of laminated piezoelectric beam is proposed. The enhanced model accounts for the effects of 3D distribution of mechanical stress and strain and the induced electric potential. The model is tested by means of numerical simulations and static and dynamical experimental tests. Applications to the distributed actuation of bistable devices by piezoelectric elements is reported as well. The model consists in an elastic buckled beam equipped with piezoelectric actuators. The model is mainly based on extensible elastica for a piezoelectric sandwich beam. The stability of the snap-through phenomenon is then controlled by two paramerters of actuation (electric potentials)

关键词： Piezoelectric actuators

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modelling OF WIRE-ON-DRUM SHAPE MEMORY ACTUATORS FOR LINEAR AND ROTARY MOTION

MODELLING OF WIRE-ON-DRUM SHAPE MEMORY ACTUATORS FOR LINEAR ...

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3rd Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures, and Intelligent systems (SMASIS)/symposium on Modeling, Simulation and control

作者： Mammano, Giovanni Scire Dragoni, Eugenio Univ Modena & Reggio Emilia Dep Engn Sci & Methods Reggio Emilia Italy

ISBN: (纸本)9780791844151

The paper presents the analytical model of a linear/rotary solid-state actuator formed by a shape memory wire wound over a cylindrical drum. The model assumes a bilinear stress-strain behaviour of the wire in the martensitic state (low temperature) and a linear elastic response in the austenitic state (high temperature). Based on simple equilibrium conditions, the model calculates the stress and strain distributions in the wire subjected to a constant backup force and to frictional sliding forces at the contact with the drum. Closed-form expressions are supplied for the stroke produced by whatever actuator geometry. The model shows that large strokes (up to one half of the drum diameter) are achieved if the frictional coefficient is kept below 0.01. Rolling-contact architectures or sonic-pulse excitation of the drum are discussed as technical solutions to obtain such low friction values.

关键词： Wire

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MULTIPHYSICS modelling AND DESIGN OF SHAPE MEMORY ALLOY WAVE SPRINGS AS LINEAR ACTUATORS

MULTIPHYSICS MODELLING AND DESIGN OF SHAPE MEMORY ALLOY WAVE...

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3rd Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures, and Intelligent systems (SMASIS)/symposium on Modeling, Simulation and control

作者： Spaggiari, Andrea Dragoni, Eugenio Univ Modena & Reggio Emilia Dept Engn Sci & Methods Modena Italy

ISBN: (纸本)9780791844151

This paper explores the merits of shape memory wave springs as powering elements of solid state actuators. Advantages and disadvantages of the wave construction in comparison to the traditional helical shape are presented and discussed by means of dimensionless functions. The main assets of the wave springs are the higher electrical resistance (leading to simpler electrical drives) and the lower cooling time (leading to enhanced working frequency). The wave geometry is also superior in purely mechanical terms to the helical counterpart when axial space is at a premium. A step-by-step design procedure is proposed, leading to the optimal wave spring meeting the multiphysics design specifications and constraints. A case study is finally reported, showing the application of shape memory wave springs to the design of a telescopic linear actuator.

关键词： Linear actuators

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Attitude of the subject towards feedback and its implications for BCI use in neurorehabilitation

Attitude of the subject towards feedback and its implication...

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2010 3rd International symposium on Applied Sciences in biomedical and Communication Technologies, ISABEL 2010

作者： Carabalona, Roberta Biomedical Technological Department Don Gnocchi Foundation Milan Italy

ISBN: (纸本)9781424481323

Brain-Computer Interface (BCI) systems allow user to operate devices without muscular activation and experimental results indicate that they can induce activity-dependent plasticity. A BCI system has two key features: exploitation of brain signal changes induced by the cognitive task assigned to the user and mutual learning. With respect to the first feature, BCI users can learn to control and hence change their cortical activity, for example by performing a motor imagery task. Mutual learning, on the other hand, is set up between users, which have to learn how to control their brain activity, and the classifier used for learning and categorize brain signal changes. This mutual learning can be mediated by the use of feedback, which in turn can be discrete or continuous, abstract or realistic and so on. Motor imagery represents a promising approach for stroke rehabilitation, thus a BCI based on a motor imagery paradigm could be a useful tool. Nevertheless, in stroke rehabilitation settings two issues are emerging which are also crucial for motor imagery BCIs. The first one relates to the importance of recognize the imagery ability of the subject, the second one to the importance of feedback in re-learning of motor skills. The present study relates to this second issue and it is aimed at investigating attitudes of BCI users towards feedback. We considered a sample of six healthy males, using an EEG-based BCI and executing a Motor Imagery task without feedback (training phase) and with feedback (performance phase). A horizontal bar of varying length depicted on a computer screen was used as feedback medium and overall accuracy data were matched with neurophysiological data acquired from Pz and Oz. Results could be of importance for BCI use as neurorehabilitation tool in stroke rehabilitation protocols since they suggest that some subjects could need an increased cortical activation in order to deal with a stimulus like visual feedback. Moreover, they reveal a possible

关键词： Brain computer interface

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TORSIONAL BEHAVIOR OF SHAPE MEMORY ALLOY TUBES FOR biomedical APPLICATIONS

TORSIONAL BEHAVIOR OF SHAPE MEMORY ALLOY TUBES FOR BIOMEDICA...

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3rd Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures, and Intelligent systems (SMASIS)/symposium on Modeling, Simulation and control

作者： Chapman, Cory Karbaschi, Zohreh Elahinia, Mohammad Tabesh, Majid Univ Toledo Dynam & Smart Syst Lab MIME Dept Toledo OH 43606 USA

ISBN: (纸本)9780791844151

Shape memory alloys have been implemented in various applications throughout aerospace, biomedical, and various other fields. Some currently investigated applications of shape memory alloys include biomedical stents, rotary blade actuators, and pedicle screws for securing osteoporotic vertebrae. There have been many models developed by previous authors that discuss the reactions of this alloy in tension, compression, and one dimensional bending. It was the goal of this investigation to expand upon previous works to model the behavior of a shape memory alloy tube in pure torsion. The motivation for this investigation was the biomedical applications of this alloy. Because of its distinct properties of superelasticity and shape memory effect, the alloy is ideal for the design and implementation of medical devices that are smaller and more efficient than previous methods. The goal of this investigation was to model the properties of an SMA tube in torsion for use in an active orthoses for the treatment neuromuscular disorders and various other biomedical devices which involve the implementation of nitinol tubes in torsion. To this end, a model using COMSOL Multiphysics was developed which, in turn, will aid in predicting the behavior of an SMA tube under a torsional load and allow for calculation of an optimal torque tube for our applications. The outputs gained from this model were the angle of deformation under an applied torque, the resultant torque upon unloading of the tube, and the stress-strain relationships. From this information, different tube geometries will be experimentally tested to determine the best design for implementation. Once the analytical forces were determined from the SMA tubes using the COMSOL model, these results were then compared to experimental values from previous works to evaluate the accuracy of the model for the desired conditions.

关键词： Shape memory effect

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ELECTROMECHANICAL modelling AND EXPERIMENTS OF A BISTABLE PLATE FOR NONLINEAR ENERGY HARVESTING

ELECTROMECHANICAL MODELLING AND EXPERIMENTS OF A BISTABLE PL...

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3rd Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures, and Intelligent systems (SMASIS)/symposium on Modeling, Simulation and control

作者： Arrieta, Andres F. Erturk, Alper Hagedorn, Peter Inman, Daniel J. Tech Univ Darmstadt Dynam & Vibrat Grp D-64289 Darmstadt Germany

ISBN: (纸本)9780791844151

Vibration based energy harvesting has received extensive attention in the engineering community in the past decade. It has been mainly focused on linear electromechanical devices excited close or at resonance, where these systems operate optimally. Although much progress has been achieved in this research direction, real harvesting devices would seldom operate in environment with such idealized conditions. Recently, the idea to use nonlinearity to enhance the performance for energy harvesters has been introduced. Nonlinear devices have been shown to have the potential to operate over a wider band of frequencies and deliver higher power. Bistable composites are a new type of composites exhibiting two stable states so far considered for morphing applications. In this paper, we propose to exploit the nonlinear behaviour of a bistable composite plate with bonded flexible piezoelectric patches to obtain a nonlinear energy harvesting device. The response of the structure is investigated revealing several large amplitude nonlinear phenomena over a wide range of frequencies. Resistor sweeps are conducted for representative dynamic regimes giving the optimal electrical load for each type of oscillations. The observed characteristics give the proposed device the potentiality for broadband energy harvesting.

关键词： Energy harvesting

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modelling of detailed insulin receptor kinetics affects sensitivity and noise in the downstream signalling pathway

Modelling of detailed insulin receptor kinetics affects sens...

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9th International symposium on Dynamics and control of Process systems, DYCOPS 2010

作者： Luni, Camilla Sanft, Kevin R. Petzold, Linda R. Doyle III, Francis J. Chemical Engineering Department University of California at Santa Barbara Santa Barbara CA 93106-5080 United States Computer Science Department University of California at Santa Barbara Santa Barbara CA 93106-5070 United States

ISBN: (纸本)9783902661692

Insulin resistance is a primary defect underlying the development of type II diabetes. In healthy conditions, insulin stimulates glucose uptake from the blood stream, but in diseased conditions the normal metabolic response is impaired. Identifying specific drug targets to restore insulin sensitivity at the cellular level and developing an effective treatment strategy require insight into both the biochemical mechanisms involved and the whole signalling network response to external cues. This study focuses on the consequences of integrating a detailed biochemical description of the insulin receptor trafficking compartment within a phenomenological model of the downstream signalling pathway. While the description of the experimental data is preserved by an iterative procedure of parameter fitting, the dynamic response of the network is highly modified, as shown by analyzing the complementary information derived from studying both connection sensitivities and node noise in the network. This is crucial considering the importance of network dynamics for identifying effective drug targets. © 2009 ifac.

关键词： Insulin

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System modelling approach for fault detection in nonlinear systems

System modelling approach for fault detection in nonlinear s...

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International symposium on systems and control in Aerospace and Astronautics (ISSCAA)

作者： Huajun Gong F. N. Chowdhury Jianfang Xing College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing Jiangsu China Department of Electrical and Computer Engineering University of Louisiana Lafayette LA USA

This paper addresses the issue of system modelling for fault detection in nonlinear systems. In many practical situations a primary model (physical model or linearized model) of a nonlinear system already exists. In such cases, we propose to build an auxiliary model that drives the residual of the combined (primary plus auxiliary) model to zero during fault-free operation. The auxiliary model can be built by any data-driven technique in real time. Once the auxiliary model is built and the combined residual converges to zero, the model parameters are kept constant; after this, the model can be used as the basis for fault detection in the original nonlinear system. Simulation shows that the proposed scheme is effective and has potential application ability in fault detection and identification (FDI).

关键词： Artificial neural networks Observers Nonlinear systems Fault detection Mathematical model Adaptation model

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A multiclassifier system with dynamic ensemble selection applied to the recognition of EMG signals for the control of bio-prosthetic hand

A multiclassifier system with dynamic ensemble selection app...

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International symposium on Applied Sciences on biomedical and Communication Technologies, ISABEL

作者： Marek Kurzynski Tomasz Woloszynski Andrzej Wolczowski Department of Systems and Computer Networks Wroclaw University of Technology Wroclaw Poland Institute of Computer Science and Robotics Wroclaw University of Technology Wroclaw Poland

The paper presents a concept of hand movements recognition on the basis of EMG signal analysis. Signal features are represented by coefficient of autoregressive (AR) model, and as classifier the original multiclassifier systems with dynamic ensemble selection are applied. The performance of the proposed methods was experimentally compared against three classifiers using real datasets. The systems developed achieved the highest overall classification accuracies demonstrating the potential of dynamic classifier selection for recognition of EMG signals.

关键词： Electromyography Accuracy Feature extraction Pattern recognition Muscles Heuristic algorithms Mathematical model

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