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Actuators
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Actuators for Haptics
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Actuators for Haptics

A special issue of Actuators (ISSN 2076-0825). This special issue belongs to the section "Actuators for Robotics".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 10012

Special Issue Editor

Dr. Daniele Leonardis

E-Mail Website
Guest Editor
Perceptual Robotics (PERCRO) Laboratory, TeCIP Institute, Scuola Superiore Sant'Anna of Pisa, 56010 Pisa, Italy
Interests: haptic devices and actuators; haptic perception; teleoperation; exoskeletons; robotic-assisted neurorehabilitation

Special Issue Information

Dear colleagues,

Recent advances in immersive virtual reality and robotic teleoperation highlight the need to provide the sense of touch when interacting in similar “visual-only” scenarios. Haptic devices are designed to this purpose, still, the perception of haptic cues is the result of complex stimulation of different mechanoreceptors, resulting in a variety of sensory cues. The challenge is to artificially replicate such complex stimulation, finding the most convenient trade-off between informative stimuli and strict constraints in terms of encumbrance and complexity of the haptic device.

Actuators used in haptics play a fundamental role in meeting requirements of dynamics, range and noise of the output stimuli, with respect to weight, compactness and miniaturized mechanical complexity imposed by device design.

This Special Issue seeks to gather and foster new ideas for the actuation of haptic devices, and to exploit new actuator features in advanced device designs.

Dr. Daniele Leonardis
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Actuators is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Haptic Actuators
  • Tactile feedback actuators and devices
  • Force feedback actuators and devices
  • Cutaneous and vibrotactile feedback actuators and devices
  • Actuators for Wearable Haptics
  • Actuators for tactile displays

Published Papers (3 papers)

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Research

14 pages, 11870 KiB  
Article
A 2-DOF Impact Actuator for Haptic Application
by Sangyoon Kim, Woochan Lee and Jaeyoung Park
Actuators 2022, 11(3), 70; https://doi.org/10.3390/act11030070 - 24 Feb 2022
Viewed by 3113
Abstract
The demand for realistic haptic feedback actuators has increased as mobile devices have increased in popularity. However, most current haptic actuators provide limited 1-DOF tactile sensations, such as vibrations. This paper presents a 2-DOF haptic impact actuator that can provide planar directional (e.g., [...] Read more.
The demand for realistic haptic feedback actuators has increased as mobile devices have increased in popularity. However, most current haptic actuators provide limited 1-DOF tactile sensations, such as vibrations. This paper presents a 2-DOF haptic impact actuator that can provide planar directional (e.g., x and y directional) and magnitude tactile cues to a user. We built an impact actuator that was designed to be of such a size that a user can grasp it with one hand. Multiple electromagnets of the actuator drive a permanent magnet to hit the actuator housing, creating an impact. For the control of the impact direction, we assumed the direction of a magnetic field vector at the centre of the actuator would follow that of a reference vector formed by voltage heading into the electromagnet array. The results of magnetic field measurements support our assumption by showing that the trend of the magnetic field vector coincided with that of the reference voltage vector. Furthermore, the measurement of the impact acceleration showed the trend that the impact direction follows the reference voltage vector. Full article
(This article belongs to the Special Issue Actuators for Haptics)
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16 pages, 1395 KiB  
Article
Real-Time Numerical Simulation for Accurate Soft Tissues Modeling during Haptic Interaction
by Paolo Tripicchio, Salvatore D’Avella and Emanuele Ruffaldi
Actuators 2022, 11(1), 17; https://doi.org/10.3390/act11010017 - 8 Jan 2022
Cited by 2 | Viewed by 2657
Abstract
The simulation of fabrics physics and its interaction with the human body has been largely studied in recent years to provide realistic-looking garments and wears specifically in the entertainment business. When the purpose of the simulation is to obtain scientific measures and detailed [...] Read more.
The simulation of fabrics physics and its interaction with the human body has been largely studied in recent years to provide realistic-looking garments and wears specifically in the entertainment business. When the purpose of the simulation is to obtain scientific measures and detailed mechanical properties of the interaction, the underlying physical models should be enhanced to obtain better simulation accuracy increasing the modeling complexity and relaxing the simulation timing constraints to properly solve the set of equations under analysis. However, in the specific field of haptic interaction, the desiderata are to have both physical consistency and high frame rate to display stable and coherent stimuli as feedback to the user requiring a tradeoff between accuracy and real-time interaction. This work introduces a haptic system for the evaluation of the fabric hand of specific garments either existing or yet to be produced in a virtual reality simulation. The modeling is based on the co-rotational Finite Element approach that allows for large displacements but the small deformation of the elements. The proposed system can be beneficial for the fabrics industry both in the design phase or in the presentation phase, where a virtual fabric portfolio can be shown to customers around the world. Results exhibit the feasibility of high-frequency real-time simulation for haptic interaction with virtual garments employing realistic mechanical properties of the fabric materials. Full article
(This article belongs to the Special Issue Actuators for Haptics)
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16 pages, 6640 KiB  
Article
A Twisted String, Flexure Hinges Approach for Design of a Wearable Haptic Thimble
by Daniele Leonardis, Luca Tiseni, Domenico Chiaradia and Antonio Frisoli
Actuators 2021, 10(9), 211; https://doi.org/10.3390/act10090211 - 29 Aug 2021
Cited by 4 | Viewed by 2883
Abstract
Wearable haptic devices in the shape of actuated thimbles are used to render the sense of touch in teleoperation and virtual reality scenarios. The design of similar devices has to comply with concurring requirements and constraints: lightweight and compactness, intensity and bandwidth of [...] Read more.
Wearable haptic devices in the shape of actuated thimbles are used to render the sense of touch in teleoperation and virtual reality scenarios. The design of similar devices has to comply with concurring requirements and constraints: lightweight and compactness, intensity and bandwidth of the rendered signals. Micro-sized motors require a mechanical reduction to increase the output force, at the cost of noise and vibrations introduced by conventional gear reducers. Here we propose a different actuation method, based on a miniaturized twisted string actuator and a flexure hinge transmission mechanism. The latter is required to transmit and transform the pulling force of the twist actuator to a pushing force of the plate in contact with the fingerpad. It achieves a lightweight and noiseless actuation in a compact mechanism. In this work, we present design guidelines of the proposed approach, optimization, and FEM analysis of the flexure hinge mechanism, implementation of the prototype, and experimental characterization of the twist actuator measuring frequency response and output force capabilities. Full article
(This article belongs to the Special Issue Actuators for Haptics)
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