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Actuators, Volume 4, Issue 1 (March 2015) – 4 articles , Pages 1-59

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Article
Parameters Identification for a Composite Piezoelectric Actuator Dynamics
Actuators 2015, 4(1), 39-59; https://doi.org/10.3390/act4010039 - 17 Mar 2015
Cited by 3 | Viewed by 5303
Abstract
This work presents an approach for identifying the model of a composite piezoelectric (PZT) bimorph actuator dynamics, with the objective of creating a robust model that can be used under various operating conditions. This actuator exhibits nonlinear behavior that can be described using [...] Read more.
This work presents an approach for identifying the model of a composite piezoelectric (PZT) bimorph actuator dynamics, with the objective of creating a robust model that can be used under various operating conditions. This actuator exhibits nonlinear behavior that can be described using backlash and hysteresis. A linear dynamic model with a damping matrix that incorporates the Bouc–Wen hysteresis model and the backlash operators is developed. This work proposes identifying the actuator’s model parameters using the hybrid master-slave genetic algorithm neural network (HGANN). In this algorithm, the neural network exploits the ability of the genetic algorithm to search globally to optimize its structure, weights, biases and transfer functions to perform time series analysis efficiently. A total of nine datasets (cases) representing three different voltage amplitudes excited at three different frequencies are used to train and validate the model. Four cases are considered for training the NN architecture, connection weights, bias weights and learning rules. The remaining five cases are used to validate the model, which produced results that closely match the experimental ones. The analysis shows that damping parameters are inversely proportional to the excitation frequency. This indicates that the suggested hysteresis model is too general for the PZT model in this work. It also suggests that backlash appears only when dynamic forces become dominant. Full article
(This article belongs to the Special Issue High-Resolution Actuators)
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Review
Self-Sensing Ionic Polymer Actuators: A Review
Actuators 2015, 4(1), 17-38; https://doi.org/10.3390/act4010017 - 02 Mar 2015
Cited by 59 | Viewed by 9079
Abstract
Ionic electromechanically active polymers (IEAP) are laminar composites that can be considered attractive candidates for soft actuators. Their outstanding properties such as low operating voltage, easy miniaturization, and noiseless operation are, however, marred by issues related to the repeatability in the production and [...] Read more.
Ionic electromechanically active polymers (IEAP) are laminar composites that can be considered attractive candidates for soft actuators. Their outstanding properties such as low operating voltage, easy miniaturization, and noiseless operation are, however, marred by issues related to the repeatability in the production and operation of these materials. Implementing closed-loop control for IEAP actuators is a viable option for overcoming these issues. Since IEAP laminates also behave as mechanoelectrical sensors, it is advantageous to combine the actuating and sensing functionalities of a single device to create a so-called self-sensing actuator. This review article systematizes the state of the art in producing self-sensing ionic polymer actuators. The IEAPs discussed in this paper are conducting (or conjugated) polymers actuators (CPA), ionic polymer-metal composite (IPMC), and carbonaceous polymer laminates. Full article
(This article belongs to the Special Issue Feature Papers)
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Article
Realization of an Automated Vertical Warp Stop Motion Positioning
Actuators 2015, 4(1), 2-16; https://doi.org/10.3390/act4010002 - 16 Feb 2015
Cited by 3 | Viewed by 5857
Abstract
The tension in the warp yarns is a critical variable in the weaving process. If the warp tension is too high or too low the weaving process will be interrupted. A parameter that directly affects the warp tension is the vertical warp stop [...] Read more.
The tension in the warp yarns is a critical variable in the weaving process. If the warp tension is too high or too low the weaving process will be interrupted. A parameter that directly affects the warp tension is the vertical warp stop motion position. The position of the warp stop motion must be set for every produced new article. The setting procedure is performed completely manual. In this paper we present a mechatronic modification of an air jet-weaving machine to adjust the vertical warp stop motion position with the help of actuators. The parameters for the automated movement are determined and an open loop control, which uses a PLC, is proposed. Full article
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Editorial
Acknowledgement to Reviewers of Actuators in 2014
Actuators 2015, 4(1), 1; https://doi.org/10.3390/act4010001 - 09 Jan 2015
Viewed by 3687
Abstract
The editors of Actuators would like to express their sincere gratitude to the following reviewers for assessing manuscripts in 2014:[...] Full article
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