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A precise positioning actuator based on feedback-controlled magnetic shape memory alloys
2012
Mechatronics (Oxford)
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The performance of an adaptive hysteresis compensator based on the Preisach-like Krasnosel'skii-Pokrovskii model is analyzed and evaluated in the presence of temperature changes. ...
Experiments confirm that the undesirable effects of temperature on the precision of the device can be partially addressed with an adaptive model-based algorithm devised to cope with time-varying nonlinearities ...
KP K ðnÞ T is the vector of the state of each hysteron at time n, and v ¼ ½ v 1 v 2 . . . v K T is the vector of the weights. ...
doi:10.1016/j.mechatronics.2011.12.004
fatcat:gbhftaseknbdxdae5c5mv6vxem
Feedforward Controller of Ill-Conditioned Hysteresis Using Singularity-Free Prandtl–Ishlinskii Model
2009
IEEE/ASME transactions on mechatronics
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An inevitable tradeoff between modeling accuracy and inversion stability exists. The hysteretic modeling improves with increasing number of play operators. ...
The inverse weights are then evaluated to determine the inverse hysteresis model for the feedforward controller. For illustration purpose, a piezoelectric actuator is used. ...
The inverse PI model can be computed easily too. In this singularity-free PI model, the formulas formed are based on one assumption. ...
doi:10.1109/tmech.2008.2009936
pmid:19936032
pmcid:PMC2778866
fatcat:qg5o7iiysvea7k2df4e3bddf7i
Modeling and Control of Piezoelectric Actuators for Active Physiological Tremor Compensation
[chapter]
2007
Human Robot Interaction
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Some proposed incorporating inverse hysteresis model with a controller while others proposed advance controllers like neural network [Hwang et al. 2003 ], fuzzy logic [Stepanenko et al. 1998 ], sliding ...
The rate-independent controller is based on the modified PI hysteresis model identified at the same 10Hz, 12.5 µm p-p sinusoid. ...
It is neither possible nor is it our intention to cover every important work in this important research field in one volume. ...
doi:10.5772/5203
fatcat:2tciyz4uxjalhexgnc7kae4x2y
A Methodology Towards Comprehensive Evaluation of Shape Memory Alloy Actuators for Prosthetic Finger Design
2011
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As a result, the search is on-going to find a more appropriate actuation solution that is lightweight, noiseless, strong and cheap. ...
Instead, these control strategies are derived using iterative numerical methods such as neural networks or fuzzy models based on the experience of the researcher. ...
The group have also developed variations on this theme by introducing a fuzzy based inverse Preisach model to reduce modelling inaccuracies, and a fuzzy based PID tuning rule-base [113] . ...
doi:10.21427/d71c8b
fatcat:pnkddbhuandkhi6xq2yhipy5jq
Hysteresis modelling of high temperature superconductors
2005
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Le modèle d'état critique est un modèle macroscopique connu qui décrit bien cette pénétration partielle du flux. ...
The present dissertation considers the capabilities, limitations and possible extensions of modelling the hysteresis that is exhibited by type-II superconductors, especially those with high critical temperature ...
They introduced feed forward neural networks instead of more classical functions in order to compute the hysteretic output. ...
doi:10.5075/epfl-thesis-2372
fatcat:xtbs7gojpvai5gapgrgmr2lqei
Ziolkowski_columbia_0054D_15675.pdf
[article]
2019
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critique but also on the identification and working through such Schärfe-one example of an iterative procedure, engendering the texture of citation across Cassirer's oeuvre. ...
before World War One and arrives at eine sehr erstaunte Unruhe-neural pathways begin to develop from an event and are severed before arriving at an operable receptor. ...
doi:10.7916/d8-2jgr-ec38
fatcat:d6lvfbaltnaqdd2al2voolf4ui